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74HC257D-74HC257DB-74HC257N-74HC257PW-74HCT257D-74HCT257N-74HCT257PW
Quad 2-input multiplexer 3-state
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74HC/HCT257
FEATURES Non-inverting data path 3-state outputs interface directly with system bus Output capability: bus driver ICC category: MSI
GENERAL DESCRIPTIONThe 74HC/HCT257 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 74HC/HCT257 have 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 S is HIGH. Data appears at
the outputs (1Y to 4Y) in true (non-inverting) form from the
selected inputs.
The “257” 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 S. The outputs
are forced to a high impedance OFF-state when OE is
HIGH.
The logic equations for the outputs are:= OE.(1I1.S+ 1I0.S)= OE.(2I1.S+ 2I0.S)= OE.(3I1.S+ 3I0.S)= OE.(4I1.S+ 4I0.S)
The “257” is identical to the “258” but has non-inverting
(true) outputs.
QUICK REFERENCE DATAGND= 0 V; Tamb =25 °C; tr =tf= 6 ns
Notes CPD is used to determine the dynamic power dissipation (PD in μW): =CPD× VCC2×fi +∑ (CL× VCC2× fo) where:= input frequency in MHz= output frequency in MHz (CL× VCC2×fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC− 1.5 V
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74HC/HCT257
ORDERING INFORMATION
PIN DESCRIPTION
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74HC/HCT257
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74HC/HCT257
DC CHARACTERISTICS FOR 74HCFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HCGND= 0 V; tr =tf= 6 ns; CL= 50 pF
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74HC/HCT257
DC CHARACTERISTICS FOR 74HCTFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT typesThe value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCTGND= 0 V; tr =tf= 6 ns; CL= 50 pF
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74HC/HCT257
AC WAVEFORMS
