74HC14DB - Philips Semiconductors / NXP Semiconductors

DATA SH EET

Product speciﬁcation

File under Integrated Circuits, IC06 September 1993

INTEGRATED CIRCUITS

74HC/HCT14

Hex inverting Schmitt trigger

For a complete data sheet, please also download:

•The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Information

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines

September 1993 2

Philips Semiconductors Product speciﬁcation

Hex inverting Schmitt trigger 74HC/HCT14

FEATURES

•Output capability: standard

•ICC category: SSI

GENERAL DESCRIPTION

The 74HC/HCT14 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL).

They are specified in compliance with JEDEC standard no. 7A.

The 74HC/HCT14 provide six inverting buffers with Schmitt-trigger action. They are capable of transforming slowly

changing input signals into sharply defined, jitter-free output signals.

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr= tf= 6 ns

Notes

1. CPD is used to determine the dynamic power dissipation (PDin µW):

PD= CPD ×VCC2×fi+∑(CL×VCC2×fo) where:

fi= input frequency in MHz

fo= output frequency in MHz

CL= output load capacitance in pF

VCC = supply voltage in V

∑(CL×VCC2×fo) = sum of outputs

2. For HC the condition is VI= GND to VCC

For HCT the condition is VI= GND to VCC −1.5 V

ORDERING INFORMATION

See

“74HC/HCT/HCU/HCMOS Logic Package Information”

SYMBOL PARAMETER CONDITIONS TYPICAL UNIT

HC HCT

tPHL/ tPLH propagation delay nA to nY CL= 15 pF; VCC = 5 V 12 17 ns

CIinput capacitance 3.5 3.5 pF

CPD power dissipation capacitance per gate notes 1 and 2 7 8 pF

September 1993 3

Philips Semiconductors Product speciﬁcation

Hex inverting Schmitt trigger 74HC/HCT14

PIN DESCRIPTION

PIN NO. SYMBOL NAME AND FUNCTION

1, 3, 5, 9, 11, 13 1A to 6A data inputs

2, 4, 6, 8, 10, 12 1Y to 6Y data outputs

7 GND ground (0 V)

14 VCC positive supply voltage

Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.

Fig.4 Functional diagram. Fig.5 Logic diagram

(one Schmitt trigger).

FUNCTION TABLE

Notes

1. H = HIGH voltage level

L = LOW voltage level

APPLICATIONS

•Wave and pulse shapers

•Astable multivibrators

•Monostable multivibrators

INPUT OUTPUT

nA nY

September 1993 4

Philips Semiconductors Product speciﬁcation

Hex inverting Schmitt trigger 74HC/HCT14

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”

. Transfer characteristics are

given below.

Output capability: standard

ICC category: SSI

Transfer characteristics for 74HC

Voltages are referenced to GND (ground = 0 V)

AC CHARACTERISTICS FOR 74HC

GND = 0 V; tf= tf= 6 ns; CL= 50 pF

SYMBOL PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HC VCC

(V) WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

VT+ positive-going

threshold 0.7

1.7

2.1

1.18

2.38

3.14

1.5

3.15

4.2

0.7

1.7

2.1

1.5

3.15

4.2

0.7

1.7

2.1

1.5

3.15

4.2

V 2.0

4.5

6.0

Figs 6 and 7

VT−negative-going

threshold 0.3

0.9

1.2

0.52

1.40

1.89

0.90

2.00

2.60

0.3

0.90

1.20

0.90

2.00

2.60

0.30

0.90

1.2

0.90

2.00

2.60

V 2.0

4.5

6.0

Figs 6 and 7

VHhysteresis

(VT+− VT−)0.2

0.4

0.6

0.66

0.98

1.25

1.0

1.4

1.6

0.2

0.4

0.6

1.0

1.4

1.6

0.2

0.4

0.6

1.0

1.4

1.6

V 2.0

4.5

6.0

Figs 6 and 7

SYMBOL PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HC VCC

(V) WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

tPHL/ tPLH propagation delay

nA to nY 41

125

155

190

ns 2.0

4.5

6.0

Fig.8

tTHL/ tTLH output transition

time 19

110

ns 2.0

4.5

6.0

Fig.8

September 1993 5

Philips Semiconductors Product speciﬁcation

Hex inverting Schmitt trigger 74HC/HCT14

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”

. Transfer characteristics are

given below.

Output capability: standard

ICC category: SSI

Note to HCT types

The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.

To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

Transfer characteristics for 74HCT

Voltages are referenced to GND (ground = 0 V)

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr= tf= 6 ns; CL= 50 pF

INPUT UNIT LOAD COEFFICIENT

nA 0.3

SYMBOL PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HCT VCC

(V) WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

VT+ positive-going

threshold 1.2

1.4 1.41

1.59 1.9

2.1 1.2

1.4 1.9

2.1 1.2

1.4 1.9

2.1 V 4.5

5.5 Figs 6 and 7

VT−negative-going

threshold 0.5

0.6 0.85

0.99 1.2

1.4 0.5

0.6 1.2

1.4 0.5

0.6 1.2

1.4 V 4.5

5.5 Figs 6 and 7

VHhysteresis

(VT+−VT−)0.4

0.4 0.56

0.60 −

−0.4

0.4 −

−0.4

0.4 −

−V 4.5

5.5 Figs 6 and 7

SYMBOL PARAMETER

Tamb (°C)

UNIT

TEST CONDITIONS

74HCT VCC

(V) WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

tPHL/ tPLH propagation delay

nA, to nY 20 34 43 51 ns 4.5 Fig.8

tTHL/ tTLH output transition

time 7 15 19 22 ns 4.5 Fig.8

September 1993 6

Philips Semiconductors Product speciﬁcation

Hex inverting Schmitt trigger 74HC/HCT14

TRANSFER CHARACTERISTIC WAVEFORMS

Fig.6 Transfer characteristic.

Fig.7 Waveforms showing the definition of VT+,

VT−and VH; where VT+ and VT−are

between limits of 20% and 70%.

Fig.8 Typical HC transfer characteristics; VCC = 2 V. Fig.9 Typical HC transfer characteristics; VCC = 4.5 V.

Fig.10 Typical HC transfer characteristics; VCC = 6 V. Fig.11 Typical HCT transfer characteristics; VCC = 4.5 V.

September 1993 7

Philips Semiconductors Product speciﬁcation

Hex inverting Schmitt trigger 74HC/HCT14

AC WAVEFORMS

Fig.12 Typical HCT transfer characteristics; VCC = 5.5 V.

Fig.13 Waveforms showing the input (nA) to

output (nY) propagation delays and

output transitions times.

(1) HC : VM= 50%; VI= GND to VCC.

HCT: VM= 1.3 V; VI= GND to 3 V.

September 1993 8

Philips Semiconductors Product speciﬁcation

Hex inverting Schmitt trigger 74HC/HCT14

APPLICATION INFORMATION

The slow input rise and fall times cause additional power

dissipation, this can be calculated using the following

formula:

Pad = fi×(tr×ICCa +t

f×I

CCa)×VCC.

Where:

Average ICCa differs with positive or negative input

transitions, as shown in Figs 14 and 15.

Pad = additional power dissipation (µW)

fi= input frequency (MHz)

tr= input rise time (µs); 10% −90%

tf= input fall time (µs); 10% −90%

ICCa = average additional supply current (µA)

Fig.14 Average ICC for HC Schmitt trigger devices;

linear change of Vibetween 0.1 VCC to

0.9 VCC

Fig.15 Average ICC for HCT Schmitt trigger devices;

linear change of Vibetween 0.1 VCC to

0.9 VCC.

HC/HCT14 used in a relaxation oscillator circuit, see

Fig.16.

Fig.16 Relaxation oscillator using HC/HCT14.

HC : f 1

--- 1

0.8 RC

-------------------

≈=

HCT : f 1

--- 1

0.67 RC

----------------------

≈=

Note to Application information

All values given are typical unless otherwise specified.

PACKAGE OUTLINES

See

“74HC/HCT/HCU/HCMOS Logic Package Outlines”