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.
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.
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.
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.
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.
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”.
