INTEGRATED CIRCUITS DATA SHEET 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 74HC/HCT245 Octal bus transceiver; 3-state Product specification File under Integrated Circuits, IC06 September 1993 Philips Semiconductors Product specification Octal bus transceiver; 3-state 74HC/HCT245 FEATURES GENERAL DESCRIPTIONS * Octal bidirectional bus interface The 74HC/HCT245 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. * Non-inverting 3-state outputs * Output capability: bus driver * ICC category: MSI The 74HC/HCT245 are octal transceivers featuring non-inverting 3-state bus compatible outputs in both send and receive directions. The "245" features an output enable (OE) input for easy cascading and a send/receive (DIR) for direction control. OE controls the outputs so that the buses are effectively isolated. The "245" is similar to the "640" but has true (non-inverting) outputs. QUICK REFERENCE DATA GND = 0 V; Tamb = 25 C; tr = tf = 6 ns TYPICAL SYMBOL PARAMETER CONDITIONS UNIT HC tPHL/ tPLH propagation delay An to Bn; Bn to An CI CL = 15 pF; VCC = 5 V HCT 7 10 ns input capacitance 3.5 3.5 pF CI/O input/output capacitance 10 10 pF CPD power dissipation capacitance per transceiver notes 1 and 2 30 30 pF Notes 1. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD x VCC2 x fi + (CL x VCC2 x fo) where: fi = input frequency in MHz fo = output frequency in MHz (CL x VCC2 x fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 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". September 1993 2 Philips Semiconductors Product specification Octal bus transceiver; 3-state 74HC/HCT245 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 1 DIR direction control 2, 3, 4, 5, 6, 7, 8, 9 A0 to A7 data inputs/outputs 10 GND ground (0 V) 18, 17, 16, 15, 14, 13, 12, 11 B0 to B7 data inputs/outputs 19 OE output enable input (active LOW) 20 VCC positive supply voltage Fig.1 Pin configuration. September 1993 Fig.2 Logic symbol. 3 Fig.3 IEC logic symbol. Philips Semiconductors Product specification Octal bus transceiver; 3-state 74HC/HCT245 FUNCTION TABLE INPUTS INPUTS/OUTPUTS OE DIR L L H L H X An Bn A=B inputs Z inputs B=A Z Notes 1. H = HIGH voltage level L = LOW voltage level X = don't care Z = high impedance OFF-state Fig.4 Functional diagram. September 1993 4 Philips Semiconductors Product specification Octal bus transceiver; 3-state 74HC/HCT245 DC CHARACTERISTICS FOR 74HC For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: bus driver ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) TEST CONDITIONS 74HC SYMBOL PARAMETER +25 -40 to +85 -40 to +125 min. typ. max. min. max. min. UNIT V WAVEFORMS CC (V) max. tPHL/ tPLH propagation delay An to Bn; Bn to An 25 9 7 90 18 15 115 23 20 135 27 23 tPZH/ tPZL 3-state output enable time OE to An; OE to Bn signalname DIR 30 11 9 150 30 26 190 38 33 225 45 38 3-state output disable time OE to An; OE to Bn signalname DIR 41 15 12 150 30 26 190 38 33 225 45 38 ns output transition time 14 5 4 60 12 10 75 15 13 90 18 15 ns tPHZ/ tPLZ tTHL/ tTLH September 1993 5 ns ns 2.0 4.5 6.0 Fig.5 2.0 4.5 6.0 Fig.6 2.0 4.5 6.0 Fig.6 2.0 4.5 6.0 Fig.5 Philips Semiconductors Product specification Octal bus transceiver; 3-state 74HC/HCT245 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: bus driver ICC category: MSI 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. INPUT UNIT LOAD COEFFICIENT An Bn OE DIR 0.40 0.40 1.50 0.90 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) TEST CONDITIONS 74HCT SYMBOL PARAMETER +25 -40 to +85 -40 to +125 min. typ. max. min. max. min. UNIT V WAVEFORMS CC (V) max. tPHL/ tPLH propagation delay An to Bn; Bn to An 12 22 28 33 ns 4.5 Fig.5 tPZH/ tPZL 3-state output enable time OE to An; OE to Bn signalname DIR 16 30 38 45 ns 4.5 Fig.6 tPHZ/ tPLZ 3-state output disable time OE to An; OE to Bn signalname DIR 16 30 38 45 ns 4.5 Fig.6 tTHL/ tTLH output transition time 5 12 15 18 ns 4.5 Fig.5 September 1993 6 Philips Semiconductors Product specification Octal bus transceiver; 3-state 74HC/HCT245 AC WAVEFORMS (1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V. Fig.5 Waveforms showing the input (An, Bn) to output (Bn, An) propagation delays and the output transition times. (1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V. Fig.6 Waveforms showing the 3-state enable and disable times. PACKAGE OUTLINES See "74HC/HCT/HCU/HCMOS Logic Package Outlines". September 1993 7