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/HCT157 Quad 2-input multiplexer Product specification File under Integrated Circuits, IC06 December 1990
Philips Semiconductors Product specification Quad 2-input multiplexer 74HC/HCT157 Moving the data from two groups of registers to four common output buses is a common use of the “157”. The state of the common data select input (S) determines the particular register from which the data comes. It can also be used as function generator.
Philips Semiconductors Product specification Quad 2-input multiplexer 74HC/HCT157 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 1 S common data select input 2, 5, 11, 14 1I0 to 4I0 data inputs from source 0 3, 6, 10, 13 1I1 to 4I1 data inputs from source 1 4, 7, 9, 12 1Y to 4Y multiplexer outputs 8 GND ground (0 V) 15 E enable input (active LOW) 16 VCC positive supply voltage Fig.1 Pin configuration. December 1990 Fig.2 Logic symbol. 3 Fig.3 IEC logic symbol.
Philips Semiconductors Product specification Quad 2-input multiplexer 74HC/HCT157 FUNCTION TABLE INPUTS E S nI0 nI1 nY H X X X L L L L L L L H H L H X X X X L H L H L H Notes 1. H = HIGH voltage level L = LOW voltage level X = don’t care Fig.4 Functional diagram. Fig.5 Logic diagram.
Philips Semiconductors Product specification Quad 2-input multiplexer 74HC/HCT157 DC CHARACTERISTICS FOR 74HC For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: standard ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HC SYMBOL PARAMETER −40 to +85 +25 min. typ. max. min. max. −40 to +125 min. UNIT VCC WAVEFORMS (V) max.
Philips Semiconductors Product specification Quad 2-input multiplexer 74HC/HCT157 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: standard 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 Quad 2-input multiplexer 74HC/HCT157 AC WAVEFORMS (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.6 Waveforms showing the enable input (E) to output (nY) 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.7 Waveforms showing the data inputs (nIn) and common data select input (S) to output (nY) propagation delays.
