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74HC253DB-74HC253N-74HCT253D-74HCT253N
74HC253;74HCT253; Dual 4-input multiplexer; 3-state

Philips Semiconductors Product specification
Dual 4-input multiplexer; 3-state 74HC/HCT253
FEATURES
Non-inverting data path 3-state outputs for bus interface and multiplex expansion Common select inputs Separate output enable inputs Output capability: bus driver ICC category: MSI
GENERAL DESCRIPTION

The 74HC/HCT253 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/HCT253 have two identical 4-input multiplexers
with 3-state outputs which select two bits from four sources
selected by common data select inputs (S0,S1).
When the individual output enable (1OE, 2OE) inputs of
the 4-input multiplexers are HIGH, the outputs are forced
to the high impedance OFF-state. The “253” is 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 logic equations for the outputs are:
1Y=1OE(1l0.S1.S0+1I1.S1.S0+1I2.S1.S0+1I3.S1.S0)
2Y=2OE(2l0.S1.S0+2I1.S1.S0+2I2.S1.S0+2I3.S1.S0)
APPLICATIONS
Data selectors Data multiplexers
QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
Notes
CPD is used to determine the dynamic power dissipation (PDin 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
ORDERING INFORMATION

See “74HC/HCT/HCU/HCMOS Logic Package Information”.
Philips Semiconductors Product specification
Dual 4-input multiplexer; 3-state 74HC/HCT253
PIN DESCRIPTION
Philips Semiconductors Product specification
Dual 4-input multiplexer; 3-state 74HC/HCT253
FUNCTION TABLE
NOTES
H = HIGH voltage level= LOW voltage level= don’t care
Philips Semiconductors Product specification
Dual 4-input multiplexer; 3-state 74HC/HCT253
DC CHARACTERISTICS FOR 74HC

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC

GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Philips Semiconductors Product specification
Dual 4-input multiplexer; 3-state 74HC/HCT253
DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT types

The 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 74HCT

GND = 0 V; tr = tf = 6 ns; CL = 50 pF
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