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74AHCT257

nexperia
Part Number 74AHCT257
Manufacturer nexperia
Description Quad 2-input multiplexer
Published Jul 24, 2019
Detailed Description 74AHC257; 74AHCT257 Quad 2-input multiplexer; 3-state Rev. 02 — 9 May 2008 Product data sheet 1. General description ...
Datasheet PDF File 74AHCT257 PDF File

74AHCT257
74AHCT257


Overview
74AHC257; 74AHCT257 Quad 2-input multiplexer; 3-state Rev.
02 — 9 May 2008 Product data sheet 1.
General description The 74AHC257; 74AHCT257 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL).
It is specified in compliance with JEDEC standard No.
7-A.
The 74AHC257; 74AHCT257 has four identical 2-input multiplexers with 3-state outputs, which select 4 bits of data from two sources and are controlled by a common data select input (S).
The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data inputs from source 1 (1I1 to 4I1) are selected when input S is HIGH.
Data appears at the outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.
The 74AHC257; 74AHCT257 is the logic implementation of a 4-pole 2-position switch, where the position of the switch is determined by the logic levels applied to input S.
The outputs are forced to a high-impedance OFF-state when OE is HIGH.
The logic equations for the outputs are: 1Y = OE × (1I1 × S + 1I0 × S) 2Y = OE × (2I1 × S + 2I0 × S) 3Y = OE × (3I1 × S + 3I0 × S) 4Y = OE × (4I1 × S + 4I0 × S) The 74AHC257; 74AHCT257 is identical to the 74AHC258; 74AHCT258, but has non-inverting (true) outputs.
2.
Features I Balanced propagation delays I All inputs have Schmitt-trigger actions I Non-inverting data path I Inputs accept voltages higher than VCC I Input levels: N For 74AHC257: CMOS level N For 74AHCT257: TTL level I ESD protection: N HBM EIA/JESD22-A114E exceeds 2000 V N MM EIA/JESD22-A115-A exceeds 200 V N CDM EIA/JESD22-C101C exceeds 1000 V I Multiple package options I Specified from −40 °C to +85 °C and from −40 °C to +125 °C Nexperia 74AHC257; 74AHCT257 Quad 2-input multiplexer; 3-state 3.
Ordering information Table 1.
Ordering information Type number Package Temperature range Name 74AHC257 74AHC257D −40 °C to +125 °C SO16 74AHC257PW −40 °C to +125 °C TSSOP16 74AHCT257 74AHCT257D −40 °C to +125 °C SO16 74AHCT257PW −40 °C to +125 ...


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