1. General description
The HEF4794B is an 8-stage serial shift register. It has a storage latch associated with
each stage for strobing data from the serial input (D) to the parallel LED driver outputs
(QP0 to QP7). Data is shifted on the positive-going clock (CP) transitions. The dat a in
each shift register stage is transferred to the storage register when the strobe input (STR)
is HIGH. Data in the storage register appears at the outputs whenever the output enable
input (OE) signal is HIGH.
Two serial outputs (QS1 and QS2) are available for cascading a number of HEF4794B
devices. Serial dat a is available a t QS1 on positive-goi ng clock edges to allow high-speed
operation in cascaded systems with a fast clock rise time. The same serial data is
available at QS2 on the next negative going clock edge. This is used for cascading
HEF4794B devices when the clock has a slow rise time.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to V SS
(usually ground). Unused inputs must be connected to VDD, VSS, or another input.
2. Features and benefits
Fully static operation
5 V, 10 V, and 15 V parametric ratings
Standardized symmetrical output characteristics
Specified from 40 C to +85 C and 40 C to +125 C
Complies with JEDEC standard JESD 13-B
3. Ordering information
HEF4794B
8-stage shift-and-store register LED driver
Rev. 7 — 16 November 2011 Product data sheet
Table 1. Ordering information
All types operate from
40
C to +125
C.
Type number Package
Name Description Version
HEF4794BP DIP16 plastic dual in-line package; 16 leads (300 mil) SOT38-4
HEF4794BT SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 2 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
4. Functional diagram
Fig 1. Logic symbol Fig 2. Functional diagram
15
2
OE
D
CP STR
31
QP0
QP1
QP2
QP3
QP4
QP5
QP6
QP7
QS1
QS2
9
10
4
5
6
7
14
13
12
11
001aaf111
001aag798
8-STAGE SHIFT
REGISTER
8-BIT STORAGE
REGISTER
OPEN-DRAIN
OUTPUTS
4
QP0
5
QP1
6
QP2
7
QP3
14
QP4
13
QP5
12
QP6
11
QP7
10 QS2
9QS1
D2
CP 3
STR 1
OE 15
Fig 3. Logic diag ram
001aag799
DD
CP
CP
Q
FF 0
D
LE
Q
LATCH 0
D
CP
Q
FF 7
D
LE
Q
LATCH 7
D
CP
Q
STAGES 1 TO 6STAGE 0 STAGE 7
QP2
QP0
D QS2
QS1
LE
Q
LATCH
QP1 QP4
QP3 QP6
QP5 QP7
STR
OE
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 3 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
5. Pinning information
5.1 Pinning
5.2 Pin description
Fig 4. Pin configuratio n
HEF4794B
STR VDD
DOE
CP QP4
QP0 QP5
QP1 QP6
QP2 QP7
QP3 QS2
VSS QS1
001aag800
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
Table 2. Pin description
Symbol Pin Description
D 2 serial input
QP0 to QP7 4, 5, 6, 7, 14, 13, 12, 11 parallel output
QS1 9 serial output
QS2 10 serial output
CP 3 clock input
STR 1 strobe input
OE 15 output enable input
VDD 16 supply voltage
VSS 8 ground (0 V)
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Product data sheet Rev. 7 — 16 November 2011 4 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
6. Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state;
= LOW-to-HIGH clock transition; = HIGH-to-LOW clock transition.
[2] Q6S = the data in register stage 6 before the LOW to HIGH clock transition.
[3] Q7S = the data in register stage 7 before the HIGH to LOW clock transition.
Table 3. Function table[1]
Input Parallel output Serial output
CP OE STR DQP0 QPn QS1[2] QS2[3]
L X X Z Z Q6S no change
LXXZZn.c.Q7S
H L X no change no change Q6S no change
HHLZQPn 1 Q6S no change
HHHLQPn 1 Q6S no change
H H H no change no change no change Q7S
Fig 5. Timing diagram
001aag801
clock input
data input
strobe input
output enable
input
internal Q0S
(FF0)
QP0 output
internal Q6S
(FF6)
QP6 output
serial QS1
output
serial QS2
output
Z-state
Z-state
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Product data sheet Rev. 7 — 16 November 2011 5 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
7. Limiting values
[1] For DIP16 package: Ptot derates linearly with 12 mW/K above 70 C.
[2] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
8. Recommended operating conditions
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
VDD supply voltage 0.5 +18 V
IIK input clamping current VI<0.5 V or VI>V
DD + 0.5 V - 10 mA
VIinput voltage 0.5 VDD + 0.5 V
IOK output clamping current QSn outputs;
VO<0.5 V or VO>V
DD + 0.5 V -10 mA
QPn outputs; VO<0.5 V - 40 mA
IIinput leakage current - 10 mA
IOoutput current QSn outputs - 10 mA
QPn outputs - 40 mA
Tstg storage temperature 65 +150 C
Tamb ambient temperature 40 +125 C
Ptot total power dissipation Tamb = 40 C to +125 C
DIP16 package [1] -750mW
SO16 package [2] -500mW
P power dissipation per output - 100 mW
Table 5. Recommended operating con ditions
Symbol Parameter Conditions Min Max Unit
VDD supply voltage 3 15 V
VIinput voltage 0 VDD V
Tamb ambient temperature in free air 40 +125 C
t/V input transition rise and fall rate VDD = 5 V - 3.7 5 s/V
VDD = 10 V - 0.5 s/V
VDD = 15 V - 0.08 s/V
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 6 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
9. Static characteristics
Table 6. Static characteristics
VSS = 0 V; VI = VSS or VDD; unless otherwise specified.
Symbol Parameter Conditions VDD Tamb = 40 C Tamb = 25 C Tamb = 85 C Tamb = 125 CUnit
Min Max Min Max Min Max Min Max
VIH HIGH-level
input voltage IO < 1 A 5 V 3.5 - 3.5 - 3.5 - 3.5 - V
10 V 7.0 - 7.0 - 7.0 - 7.0 - V
15 V 11.0 - 11.0 - 11.0 - 11.0 - V
VIL LOW-level
input voltage IO < 1 A 5 V - 1.5 - 1.5 - 1.5 - 1.5 V
10 V - 3.0 - 3.0 - 3.0 - 3.0 V
15 V - 4.0 - 4.0 - 4.0 - 4.0 V
VOH HIGH-level
output voltage QSn outputs;
IO < 1 A5 V 4.95 - 4.95 - 4.95 - 4.95 - V
10 V 9 .95 - 9.95 - 9.95 - 9.95 - V
15 V 14.95 - 14.95 - 14.95 - 14.95 - V
VOL LOW-level
output voltage QSn outputs;
IO < 1 A5 V - 0.05 - 0.05 - 0.05 - 0.05 V
10 V - 0.05 - 0.05 - 0.05 - 0.05 V
15 V - 0.05 - 0.05 - 0.05 - 0.05 V
QPn outputs;
IO< 20 mA 5 V - 0.75 - 0.75 - 1.5 - 1.5 V
10 V - 0.75 - 0.75 - 1.5 - 1.5 V
15 V - 0.75 - 0.75 - 1.5 - 1.5 V
IOH HIGH-level
output current QSn outputs
VO = 2.5 V 5 V - 1.7 - 1.4 - 1.1 - 1.1 mA
VO= 4.6 V 5 V - 0.64 - 0.5 - 0.36 - 0.36 mA
VO = 9.5 V 10 V - 1.6 - 1.3 - 0.9 - 0.9 mA
VO = 13.5 V 15 V - 4.2 - 3.4 - 2.4 - 2.4 mA
IOL LOW-level
output current QSn outputs
VO = 0.4 V 5 V 0.64 - 0.5 - 0.36 - 0.36 - mA
VO = 0.5 V 10 V 1.6 - 1.3 - 0.9 - 0.9 - mA
VO = 1.5 V 15 V 4.2 - 3.4 - 2.4 - 2.4 - mA
IIinput leakage
current 15 V - 0.1 - 0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current QPn output
is HIGH;
VO=15V
5 V - 2 - 2 - 15 - 15 A
10 V - 2 - 2 - 15 - 15 A
15 V - 2 - 2 - 15 - 15 A
IDD supply current IO = 0 A 5 V - 5 - 5 - 150 - 150 A
10 V - 10 - 10 - 300 - 300 A
15 V - 20 - 20 - 600 - 600 A
CIinput
capacitance -----7.5---pF
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 7 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
10. Dynamic characteristics
Table 7. Dynamic characteristics
VSS = 0 V; Tamb = 25
C unless otherwise specified. For test circuit, see Figure 10.
Symbol Parameter Conditions VDD Extrapolation formula Min Typ Max Unit
tPHL HIGH to LOW
propagation delay CP to QS1;
see Figure 6 5 V [1] 132 ns + (0.55 ns/pF) CL-160320ns
10 V 53 ns + (0.23 ns/pF)CL- 65 130 ns
15 V 37 ns + (0.16 ns/pF)CL- 4590ns
CP to QS2;
see Figure 6 5 V 92 ns + (0.55 ns/pF)CL-120240ns
10 V 39 ns + (0.23 ns/pF)CL- 50 100 ns
15 V 32 ns + (0.16 ns/pF)CL- 4080ns
tPLH LOW to HIGH
propagation delay CP to QS1;
see Figure 6 5 V [1] 102 ns + (0.55 ns/pF) CL-130260ns
10 V 44 ns + (0.23 ns/pF)CL-55110ns
15 V 32 ns + (0.16 ns/pF)CL- 4080ns
CP to QS2;
see Figure 6 5 V 102 ns + (0.55 ns/pF)CL-130260ns
10 V 49 ns + (0.23 ns/pF)CL- 60 120 ns
15 V 37 ns + (0.16 ns/pF)CL- 4590ns
tPZL OFF-state to LOW
propagation delay CP to QPn;
see Figure 6 5 V - 240 48 0 ns
10 V - 80 160 ns
15 V - 55 110 ns
STR to QPn;
see Figure 7 5 V - 140 28 0 ns
10 V - 70 140 ns
15 V - 55 110 ns
tPLZ LOW to OFF-state
propagation delay CP to QPn;
see Figure 6 5 V - 170 34 0 ns
10 V - 75 150 ns
15 V - 60 120 ns
STR to QPn;
see Figure 7 5 V - 100 20 0 ns
10 V - 40 100 ns
15 V - 35 70 ns
ten enable time OE to QPn;
see Figure 8 5 V [2] -100200ns
10 V - 55 110 ns
15 V - 50 100 ns
tdis disable time OE to QPn;
see Figure 8 5 V [2] - 80 160 ns
10 V - 40 80 ns
15 V - 30 60 ns
tttransition time QS1, QS2;
see Figure 6 5 V [1]
[3] 35 ns + (1.00 ns/pF)CL- 85 170 ns
10 V 19 ns + (0.42 ns/pF)CL- 4080ns
15 V 16 ns + (0.28 ns/pF)CL- 3060ns
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Product data sheet Rev. 7 — 16 November 2011 8 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
[1] The typical values of the propagation delay and transition times are calculated from the extrapolation formulas show n (CL in pF).
[2] ten is the same as tPZL and tdis is the same as tPLZ
[3] tt is the same as tTLH and tTHL
tWpulse width CP; LOW and
HIGH;
see Figure 6
5 V 60 30 - ns
10 V 30 15 - ns
15 V 24 12 - ns
STR; HIGH;
see Figure 7 5 V 80 40 - ns
10 V 60 30 - ns
15 V 24 12 - ns
tsu set-up time D to CP;
see Figure 9 5 V 60 30 - ns
10 V 20 10 - ns
15 V 15 5 - ns
thhold time D to CP;
see Figure 9 5 V +5 15 - ns
10 V 20 5 - ns
15 V 20 5 - ns
fclk(max) maximum clock
frequency CP; see Figure 6 5 V 5 10 - MHz
10 V 11 22 - MHz
15 V 14 28 - MHz
Table 7. Dynamic characteristics …continued
VSS = 0 V; Tamb = 25
C unless otherwise specified. For test circuit, see Figure 10.
Symbol Parameter Conditions VDD Extrapolation formula Min Typ Max Unit
Table 8. Dynamic power dissipation
PD can be calculated from the formulas shown. VSS = 0 V; tr = tf
20 ns; Tamb = 25
C.
Symbol Parameter VDD Typical formula Where
PDdynamic power dissipation 5 V PD = 1200 fi + (fo CL) VDD2 Wf
i = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
(fo CL) = sum of the outputs;
VDD = supply voltage in V.
10 V PD = 5550 fi + (fo CL) VDD2W
15 V PD = 15000 fi + (fo CL) VDD2 W
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Product data sheet Rev. 7 — 16 November 2011 9 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
11. Waveforms
Parallel output measurement points are given in Table 9.
VOL and VOH are typical output voltage levels that occur with the output load.
Fig 6. Prop a ga tio n de la y c lock (CP) to outpu t (QPn, QS1, QS2), clock pulse width and maximum clock
frequency
001aag222
t
PLH
1/f
clk(max)
V
M
V
M
V
X
V
I
V
SS
V
DD
V
OL
V
OL
V
OL
t
W
t
PLZ
t
PLH
t
PZL
V
Y
CP input
QS1 output
QS2 output
t
THL
t
TLH
90 %
10 %
V
M
90 %
10 %
t
PHL
t
THL
t
TLH
QPn output
t
W
t
PHL
V
OH
V
OH
Table 9. Measurement points
Supply Input Output
VDD VMVMVXVY
5 V to 15 V 0.5VDD 0.5VDD 0.1VO0.9VO
Measurement points are given in Table 9.
VOL is the typical output voltage level that occurs with the output load.
Fig 7. Strobe (STR) to output (QPn) propagation delays and the strobe pulse width
001aag802
CP input
t
W
t
PLZ
t
PZL
V
M
V
M
V
X
V
Y
V
I
V
SS
V
I
V
SS
STR input
V
DD
V
OL
QPn output
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 10 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
Measurement points are given in Table 9.
VOL is the typical output voltage level that occurs with the output load.
Fig 8. Enable and disable times for input OE
001aag803
OE input
output
LOW to OFF-state
OFF-state to LOW
VI
VM
VX
tPZL
tPLZ
outputs
disabled outputs
enabled
outputs
enabled
VY
VSS
VDD
VOL
Measurement points are given in Table 9.
The shaded areas indicate when the input is permitted to change for predictable output performance.
VOL is the typical output voltage level that occurs with the output load.
Fig 9. Set-up an d hold times for the data input (D)
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 11 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
Test data is given in Table 10.
Definitions for test circuit:
DUT - Device Under Test.
RL = Load resistance.
CL = load capacitance.
RT = Termination resistance should be equal to output impedance of Zo of the pulse generator.
VEXT = External voltage for measuring switching times.
Fig 10. Test circuit for measuring switching times
001aag804
DUT
VEXT
RTCL
RL
tr
10 %
90 %
tf
VI
VIVO
VDD
VSS
input pulse
G
Table 10. Test data
Supply Input VEXT Load
VDD VItr, tftPLZ, tPZL tPLH, tPHL CLRL
5 V to 15 V VDD 20 ns VDD open 50 pF 1 k
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 12 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
12. Application information
Application example: serial-to-parallel data converting LED drivers.
Fig 11. Serial-to-par allel converting LED drivers
001aag806
QP0
DS2
PWM
dimmer input
OE STR
data
from remote
control panel
clock
CP
CONTROL
AND
SYNC
CIRCUITRY
QP7
HEF4794B QP0
DS2
VDD
VDD
OE STR CP
QP7
HEF4794B
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 13 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
13. Package outline
Fig 12. Package outline SOT38-4 (DIP16)
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
SOT38-4 95-01-14
03-02-13
MH
c
(e )
1
ME
A
L
seating plane
A1
wM
b1
b2
e
D
A2
Z
16
1
9
8
E
pin 1 index
b
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
UNIT A
max. 12 b1(1) (1) (1)
b2cD E e M Z
H
L
mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
min. A
max. bmax.
w
ME
e1
1.73
1.30 0.53
0.38 0.36
0.23 19.50
18.55 6.48
6.20 3.60
3.05 0.2542.54 7.62 8.25
7.80 10.0
8.3 0.764.2 0.51 3.2
inches 0.068
0.051 0.021
0.015 0.014
0.009
1.25
0.85
0.049
0.033 0.77
0.73 0.26
0.24 0.14
0.12 0.010.1 0.3 0.32
0.31 0.39
0.33 0.030.17 0.02 0.13
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 14 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
Fig 13. Package outline SOT109-1 (SO16)
X
wM
θ
A
A1
A2
bp
D
HE
Lp
Q
detail X
E
Z
e
c
L
vMA
(A )
3
A
8
9
1
16
y
pin 1 index
UNIT A
max. A1A2A3bpcD
(1) E(1) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
1.75 0.25
0.10 1.45
1.25 0.25 0.49
0.36 0.25
0.19 10.0
9.8 4.0
3.8 1.27 6.2
5.8 0.7
0.6 0.7
0.3 8
0
o
o
0.25 0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
1.0
0.4
SOT109-1 99-12-27
03-02-19
076E07 MS-012
0.069 0.010
0.004 0.057
0.049 0.01 0.019
0.014 0.0100
0.0075 0.39
0.38 0.16
0.15 0.05
1.05
0.041
0.244
0.228 0.028
0.020 0.028
0.012
0.01
0.25
0.01 0.004
0.039
0.016
0 2.5 5 mm
scale
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 15 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
14. Revision history
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
HEF4794B v.7 20111116 Product data sheet - HEF4794B v.6
Modifications: •Section Applications removed
•Table 6:
– IOH minimum values changed to maximum
– added the unit pF for CI
HEF4794B v.6 20100901 Product data sheet - HEF4794B v.5
HEF4794B v.5 20100402 Product data sheet - HEF4794B v.4
HEF4794B v.4 20091222 Product data sheet - HEF4794B v.3
HEF4794B v.3 20080812 Product data sheet - HEF4794B v.2
HEF4794B v.2 19990630 Product specification - HEF4794B v.1
HEF4794B v.1 19940701 Product specification - -
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 16 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
15. Legal information
15.1 Data sheet status
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of de vice(s) descr ibed in th is docume nt may have cha nged since this docume nt was publis hed and ma y dif fer in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still unde r
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liab ility for the consequences of
use of such information.
Short data sheet — A short dat a sheet is an extract from a full data sheet
with the same product type number(s) and tit le. A short data sh eet is intended
for quick reference only and shou ld not be rel ied u pon to cont ain det ailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall pre vail.
Product specificat io n — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
NXP Semiconductors and its customer, unless NXP Semiconductors and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the NXP Semiconductors product is
deemed to off er functions and qualities beyond those descri bed in the
Product data sheet.
15.3 Disclaimers
Limited warr a nty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequ ential damages (including - wit hout limitatio n - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semi conductors’ aggreg ate and cumulative liabil ity towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all informa tion supplied prior
to the publication hereof .
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suit able for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in perso nal injury, death or severe property or environmental
damage. NXP Semiconductors accepts no liab ility for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
Applications — Applications that are described herein for any of these
products are for il lustrative purposes only. NXP Semiconductors makes no
representation or warranty tha t such application s will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using NXP Semiconductors product s, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suit able and fit for the custome r’s applications and
products planned, as well as fo r the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for th e customer’s app lications and products using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanent ly and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — NXP Semiconduc tors
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nxp.com/profile/terms, unless otherwise
agreed in a valid written individua l agreement. In case an individual
agreement is concluded only the ter ms and conditions of the respective
agreement shall apply. NXP Semiconductors hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
No offer to sell or license — Not hing in this document may be interpret ed or
construed as an of fer t o sell product s that is open for accept ance or t he grant,
conveyance or implication of any license under any copyri ghts, patents or
other industrial or intellectual property rights.
Export control — This document as well as the item(s) described herein
may be subject to export control regulatio ns. Export might require a prior
authorization from competent authorities.
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contains data from the objective specification for product develop ment.
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specification.
Product [short] dat a sheet Production This document contains the product specification.
HEF4794B All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 7 — 16 November 2011 17 of 18
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
Non-automotive qualified products — Unless this data sheet expressly
states that this specific NXP Semiconductors product is automotive qualified,
the product is not suitable for automotive use. It i s neit her qua lified nor tested
in accordance with automotive testing or application requirements. NXP
Semiconductors accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automot ive specifications and standard s, customer
(a) shall use the product without NXP Semiconductors’ warranty of the
product for such automotive applications, use and specifications, and (b)
whenever cust omer uses the product for automotive applications beyond
NXP Semiconductors’ specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies NXP Semiconductors for any
liability, da mages or failed produ ct cl aims resulting from custome r design and
use of the product for automotive applications beyond NXP Semiconductors’
standard warranty and NXP Semiconductors’ product specifications.
15.4 Trademarks
Notice: All refe renced brands, produc t names, service names and trademarks
are the property of their respect i ve ow ners.
16. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
NXP Semiconductors HEF4794B
8-stage shift-and-store register LED driver
© NXP B.V. 2011. All rights reserved.
For more information, please visit: http://www.nxp.co m
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 16 November 2011
Document iden tifier: HEF4794B
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
17. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 1
4 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 3
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
6 Functional description . . . . . . . . . . . . . . . . . . . 4
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5
8 Recommended operating conditions. . . . . . . . 5
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 6
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 7
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
12 Application information. . . . . . . . . . . . . . . . . . 12
13 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 13
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 15
15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 16
15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 16
15.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
16 Contact information. . . . . . . . . . . . . . . . . . . . . 17
17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18