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 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. 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 TYPICAL SYMBOL PARAMETER CONDITIONS UNIT HC tPHL/ tPLH propagation delay 1An to 1Yn; 2An to 2Yn CI input capacitance CPD power dissipation capacitance per buffer CL = 15 pF; VCC = 5 V notes 1 and 2 Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × 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 HCT 9 11 ns 3.5 3.5 pF 35 35 pF Philips Semiconductors Product specification Octal buffer/line driver; 3-state 74HC/HCT244 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 1 1OE output enable input (active LOW) 2, 4, 6, 8 1A0 to 1A3 data inputs 3, 5, 7, 9 2Y0 to 2Y3 bus outputs 10 GND ground (0 V) 17, 15, 13, 11 2A0 to 2A3 data inputs 18, 16, 14, 12 1Y0 to 1Y3 bus outputs 19 2OE output enable input (active LOW) 20 VCC positive supply voltage Fig.1 Pin configuration. December 1990 Fig.2 Logic symbol. 3 Fig.3 IEC logic symbol. Philips Semiconductors Product specification Octal buffer/line driver; 3-state 74HC/HCT244 FUNCTION TABLE INPUTS OUTPUT nOE nAn nYn L L H L H X L H Z Note 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 74HC/HCT244 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 1An to 1Yn; 2An to 2Yn 30 11 9 110 22 19 145 28 24 165 33 28 ns 2.0 4.5 6.0 Fig.5 tPZH/ tPZL 3-state output enable time 1OE to 1Yn; 2OE to 2Yn 36 13 10 150 30 26 190 38 33 225 45 38 ns 2.0 4.5 6.0 Fig.6 tPHZ/ tPLZ 3-state output disable time 1OE to 1Yn; 2OE to 2Yn 39 14 11 150 30 26 190 38 33 225 45 38 ns 2.0 4.5 6.0 Fig.6 tTHL/ tTLH output transition time 14 5 4 60 12 10 75 15 13 90 18 15 ns 2.0 4.5 6.0 Fig.5 December 1990 5 Philips Semiconductors Product specification Octal buffer/line driver; 3-state 74HC/HCT244 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 1An 2An 1OE 2OE 0.70 0.70 0.70 0.70 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 1An to 1Yn; 2An to 2Yn 13 22 28 33 ns 4.5 Fig.5 tPZH/ tPZL 3-state output enable time 1OE to 1Yn; 2OE to 2Yn 15 30 38 45 ns 4.5 Fig.6 tPHZ/ tPLZ 3-state output disable time 1OE to 1Yn; 2OE to 2Yn 15 25 31 38 ns 4.5 Fig.6 tTHL/ tTLH output transition time 5 12 15 18 ns 4.5 Fig.5 December 1990 6 Philips Semiconductors Product specification Octal buffer/line driver; 3-state 74HC/HCT244 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 (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