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74ALS157

NXP
Part Number 74ALS157
Manufacturer NXP
Description Data selector/multiplexer
Published Apr 3, 2005
Detailed Description INTEGRATED CIRCUITS 74ALS157/74ALS158 Data selector/multiplexer Product specification IC05 Data Handbook 1991 Feb 08 P...
Datasheet PDF File 74ALS157 PDF File

74ALS157
74ALS157

Overview
INTEGRATED CIRCUITS 74ALS157/74ALS158 Data selector/multiplexer Product specification IC05 Data Handbook 1991 Feb 08 Philips Semiconductors Philips Semiconductors Product specification Data selector/multiplexer 74ALS157 Quad 2-input data selector/multiplexer, non-inverting 74ALS158 Quad 2-input data selector/multiplexer, inverting DESCRIPTION The 74ALS157 is a quad 2-input multiplexer which selects 4 bits of data from one of two sources under the control of a common select input (S).
The enable input (E) is active when Low.
When E is High, all of the outputs (Yn) are forced Low regardless of all other input conditions.
Moving data from two registers to a common output bus is a typical use of the 74ALS157.
The state of the select input determines the particular register from which data comes.
The device is the logic implementation of 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the select input.
The 74ALS158 is similar but has inverting outputs (Yn).
TYPE 74ALS157 74ALS158 74ALS157/74ALS158 TYPICAL PROPAGATION DELAY 6.
0ns 6.
0ns TYPICAL SUPPLY CURRENT (TOTAL) 6mA 6mA ORDERING INFORMATION ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C 74ALS157N, 74ALS158N 74ALS157D, 74ALS158D DRAWING NUMBER 16-pin plastic DIP 16-pin plastic SO SOT38-4 SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS Ina, Inb, Inc, Ind S E Ya – Yd, Ya – Yd Data inputs Select input Enable input Data outputs DESCRIPTION 74ALS (U.
L.
) HIGH/LOW 1.
0/1.
0 1.
0/1.
0 1.
0/1.
0 20/240 LOAD VALUE HIGH/LOW 20µA/0.
1mA 20µA/0.
1mA 20µA/0.
1mA 0.
4mA/24mA NOTE: One (1.
0) ALS unit load is defined as: 20µA in the High state and 0.
1mA in the Low state.
PIN CONFIGURATION – 74ALS157 S I0a I1a Ya I0b I1b Yb GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC E I0d I1d Yd I0c I1c Yc PIN CONFIGURATION – 74ALS158 S I0a I1a Ya I0b I1b Yb GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC E I0d I1d Yd I0c I1c Yc SC00051 SC00052 LOGIC...


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