74HC253 Datasheet, PDF (1/17 Pages) NXP Semiconductors – Dual 4-input multiplexer; 3-state

74HC253; 74HCT253
Dual 4-input multiplexer; 3-state
Rev. 03 — 22 April 2010
Product data sheet
1. General description
The 74HC253; 74HCT253 are high-speed Si-gate CMOS devices and are pin compatible
with Low-power Schottky TTL (LSTTL).
The 74HC253; 74HCT253 provides a dual 4-input multiplexer with 3-state outputs which
selects 2 bits of data from up to four sources selected by common data select inputs (S0,
S1). The two 4-input multiplexer circuits have individual active LOW output enable inputs
(1OE, 2OE).
The 74HC253 and 74HCT253 are the logic implementation of a 2-pole, 4-position switch,
where the position of the switch is determined by the logic levels applied to S0 and S1.
The outputs are forced to a high-impedance OFF-state when nOE is HIGH.
The logic equations for the outputs are:
1Y = 1OE • (1I0 • S1 • S0 + 1I1 • S1 • S0 + 1I2 • S1 • S0 + 1I3 • S1 • S0)
2Y = 2OE • (2I0 • S1 • S0 + 2I1 • S1 • S0 + 2I2 • S1 • S0 + 2I3 • S1 • S0)
2. Features and benefits
„ Non-inverting data path
„ 3-state outputs interface directly with system bus
„ Complies with JEDEC standard no. 7A
„ Common select inputs
„ Separate output enable inputs
„ Input levels:
‹ For 74HC253: CMOS level
‹ For 74HCT253: TTL level
„ ESD protection:
‹ HBM JESD22-A114F exceeds 2000 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