74HC251; 74HCT251
8-input multiplexer; 3-state
Rev. 3 9 July 2013 Product data sheet
1. General description
The 74HC251; 74HCT251 is an 8-bit multiplexer with eight binary inputs (I0 to I7), three
select inputs (S0 to S2) and an output enable input (OE). The select inputs select one of
the eight binary inputs and route it to the complementary outputs (Y and Y). A HIGH on
OE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp
diodes that enable the use of current limiting resistors to interface inputs to voltages in
excess of V .
CC
2. Features and benefits
Input levels:
For 74HC251: CMOS level
For 74HCT251: TTL level
Low-power dissipation
Non-inverting data path
Specified in compliance with JEDEC standard no. 7A
ESD protection:
HBM JESD22-A114F exceeds 2 000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from 40 C to +85 C and from 40 C to +125 C
3. Ordering information
Table 1. Ordering information
Type number Package
Temperature range Name Description Version
74HC251N 40 C to +125 C DIP16 plastic dual in-line package; 16 leads (300 mil) SOT38-4
74HCT251N
74HC251D 40 C to +125 C SO16 plastic small outline package; 16 leads; body width SOT109-1
3.9 mm
74HCT251D
74HC251DB 40 C to +125 C SSOP16 plastic shrink small outline package; 16 leads; SOT338-1
body width 5.3 mm
74HCT251DB
74HC251PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads; SOT403-1
body width 4.4 mm
74HCT251PW74HC251; 74HCT251
NXP Semiconductors
8-input multiplexer; 3-state
4. Functional diagram
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Fig 1. Logic symbol Fig 2. Functional diagram
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Fig 3. Logic diagram
74HC_HCT251 All information provided in this document is subject to legal disclaimers. NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 3 9 July 2013 2 of 20
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