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| 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 FEATURES * Octal bidirectional bus interface * Non-inverting 3-state outputs * Output capability: bus driver * ICC category: MSI GENERAL DESCRIPTIONS 74HC/HCT245 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. 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 tPHL/ tPLH CI CI/O CPD 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". PARAMETER propagation delay An to Bn; Bn to An input capacitance input/output capacitance power dissipation capacitance per transceiver notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 7 3.5 10 30 HCT 10 3.5 10 30 ns pF pF pF UNIT September 1993 2 Philips Semiconductors Product specification Octal bus transceiver; 3-state PIN DESCRIPTION PIN NO. 1 2, 3, 4, 5, 6, 7, 8, 9 10 18, 17, 16, 15, 14, 13, 12, 11 19 20 SYMBOL DIR A0 to A7 GND B0 to B7 OE VCC NAME AND FUNCTION direction control data inputs/outputs ground (0 V) data inputs/outputs output enable input (active LOW) positive supply voltage 74HC/HCT245 Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol. September 1993 3 Philips Semiconductors Product specification Octal bus transceiver; 3-state FUNCTION TABLE INPUTS OE L L H Notes DIR L H X An 74HC/HCT245 INPUTS/OUTPUTS Bn inputs B=A Z A=B inputs Z 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 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) 74HC SYMBOL PARAMETER +25 -40 to +85 -40 to +125 max. 135 27 23 225 45 38 225 45 38 90 18 15 ns 74HC/HCT245 TEST CONDITIONS UNIT V WAVEFORMS CC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 Fig.5 min. typ. max. min. max. min. tPHL/ tPLH propagation delay An to Bn; Bn to An 3-state output enable time OE to An; OE to Bn signalname DIR 3-state output disable time OE to An; OE to Bn signalname DIR output transition time 25 9 7 30 11 9 41 15 12 14 5 4 90 18 15 150 30 26 150 30 26 60 12 10 115 23 20 190 38 33 190 38 33 75 15 13 tPZH/ tPZL ns Fig.6 tPHZ/ tPLZ ns Fig.6 tTHL/ tTLH ns Fig.5 September 1993 5 Philips Semiconductors Product specification Octal bus transceiver; 3-state 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 74HC/HCT245 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 An Bn OE DIR UNIT LOAD COEFFICIENT 0.40 0.40 1.50 0.90 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HCT SYMBOL PARAMETER +25 -40 to +85 -40 to +125 max. 33 ns 4.5 Fig.5 UNIT V WAVEFORMS CC (V) TEST CONDITIONS min. typ. max. min. max. min. tPHL/ tPLH propagation delay An to Bn; Bn to An 3-state output enable time OE to An; OE to Bn signalname DIR 3-state output disable time OE to An; OE to Bn signalname DIR output transition time 12 22 28 tPZH/ tPZL 16 30 38 45 ns 4.5 Fig.6 tPHZ/ tPLZ 16 30 38 45 ns 4.5 Fig.6 tTHL/ tTLH 5 12 15 18 ns 4.5 Fig.5 September 1993 6 Philips Semiconductors Product specification Octal bus transceiver; 3-state AC WAVEFORMS 74HC/HCT245 (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 |
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