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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/HCT244 Octal buffer/line driver; 3-state Product specification File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification Octal buffer/line driver; 3-state FEATURES * Output capability: bus driver * ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT244 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. QUICK REFERENCE DATA GND = 0 V; Tamb = 25 C; tr = tf = 6 ns 74HC/HCT244 The 74HC/HCT244 are octal non-inverting buffer/line drivers with 3-state outputs. The 3-state outputs are controlled by the output enable inputs 1OE and 2OE. A HIGH on nOE causes the outputs to assume a high impedance OFF-state. The "244" is identical to the "240" but has non-inverting outputs. TYPICAL SYMBOL tPHL/ tPLH PARAMETER propagation delay 1An to 1Yn; 2An to 2Yn input capacitance power dissipation capacitance per buffer notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 9 HCT 11 ns UNIT CI CPD Notes 3.5 35 3.5 35 pF pF 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". December 1990 2 Philips Semiconductors Product specification Octal buffer/line driver; 3-state PIN DESCRIPTION PIN NO. 1 2, 4, 6, 8 3, 5, 7, 9 10 17, 15, 13, 11 18, 16, 14, 12 19 20 SYMBOL 1OE 1A0 to 1A3 2Y0 to 2Y3 GND 2A0 to 2A3 1Y0 to 1Y3 2OE VCC NAME AND FUNCTION output enable input (active LOW) data inputs bus outputs ground (0 V) data inputs bus outputs output enable input (active LOW) positive supply voltage 74HC/HCT244 Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol. December 1990 3 Philips Semiconductors Product specification Octal buffer/line driver; 3-state FUNCTION TABLE INPUTS nOE L L H Note nAn L H X 74HC/HCT244 OUTPUT nYn L H Z 1. H = HIGH voltage level L = LOW voltage level X = don't care Z = high impedance OFF-state Fig.4 Functional diagram. December 1990 4 Philips Semiconductors Product specification Octal buffer/line driver; 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. 165 33 28 225 45 38 225 45 38 90 18 15 ns 74HC/HCT244 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 1An to 1Yn; 2An to 2Yn 3-state output enable time 1OE to 1Yn; 2OE to 2Yn 3-state output disable time 1OE to 1Yn; 2OE to 2Yn output transition time 30 11 9 36 13 10 39 14 11 14 5 4 110 22 19 150 30 26 150 30 26 60 12 10 145 28 24 190 38 33 190 38 33 75 15 13 tPZH/ tPZL ns Fig.6 tPHZ/ tPLZ ns Fig.6 tTHL/ tTLH ns Fig.5 December 1990 5 Philips Semiconductors Product specification Octal buffer/line driver; 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/HCT244 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 1An 2An 1OE 2OE UNIT LOAD COEFFICIENT 0.70 0.70 0.70 0.70 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 1An to 1Yn; 2An to 2Yn 3-state output enable time 1OE to 1Yn; 2OE to 2Yn 3-state output disable time 1OE to 1Yn; 2OE to 2Yn output transition time 13 22 28 tPZH/ tPZL 15 30 38 45 ns 4.5 Fig.6 tPHZ/ tPLZ 15 25 31 38 ns 4.5 Fig.6 tTHL/ tTLH 5 12 15 18 ns 4.5 Fig.5 December 1990 6 Philips Semiconductors Product specification Octal buffer/line driver; 3-state AC WAVEFORMS 74HC/HCT244 (1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V. Fig.5 Waveforms showing the input (1An, 2An) to output (1Yn, 2Yn) 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". December 1990 7 |
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