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1. General description

The 74AHC/AHCT157-Q100 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.

The 74AHC/AHCT157-Q100 are quad 2-input multiplexer which select 4 bits of data from two

sources under the control of a common data select input (S). The enable input (E) is active

LOW. When E is HIGH, all of the outputs (1Y to 4Y) are forced LOW regardless of all other input

conditions.

Moving the data from two groups of registers to four common output buses is a common use of the

74AHC/AHCT157-Q100. 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. The device is useful

for implementing highly irregular logic by generating any four of the 16 different functions of two

variables with one variable common. The 74AHC/AHCT157-Q100 is logic implementation of a

4-pole, 2-position switch, where the position of the switch is determine by the logic levels applied to

S.

The logic equations are:

? 1Y = E × (1I1 × S + 1I0 × S)

? 2Y = E × (2I1 × S + 2I0 × S)

? 3Y = E × (3I1 × S + 3I0 × S)

? 4Y = E × (4I1 × S + 4I0 × S)

This product has been qualified to the Automotive Electronics Council (AEC) standard Q100

(Grade 1) and is suitable for use in automotive applications.

2. Features and benefits

? Automotive product qualification in accordance with AEC-Q100 (Grade 1)

? Specified from -40 °C to +85 °C and from -40 °C to +125 °C

? Balanced propagation delays

? All inputs have a Schmitt-trigger action

? Inputs accepts voltages higher than VCC

? Multiple input enable for easy expansion

? Ideal for memory chip select decoding

? For 74AHC157-Q100 only: operates with CMOS input levels

? For 74AHCT157-Q100 only: operates with TTL input levels

? ESD protection:

? MIL-STD-883, method 3015 exceeds 2000 V

? HBM JESD22-A114F exceeds 2000 V

? MM JESD22-A115-A exceeds 200 V (C = 200 pF, R = 0 Ω)

? Multiple package options

? DHVQFN package with Side-Wettable Flanks enabling Automatic Optical Inspection (AOI) of

solder joints