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74HC251 Datasheet PDF : 18 Pages
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74HC251; 74HCT251
8-input multiplexer; 3-state
Rev. 4 — 1 February 2016
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 VCC.
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
74HC251D
40 C to +125 C SO16
plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
74HCT251D
74HC251DB 40 C to +125 C SSOP16 plastic shrink small outline package; 16 leads;
74HCT251DB
body width 5.3 mm
SOT338-1
74HC251PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads;
74HCT251PW
body width 4.4 mm
SOT403-1
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