DM74LS353M datasheet(3/6 Pages) NSC

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Switching Characteristics

VCC ea50V TA ea25 C

Symbol

Parameter

RL e 2kX CL e 50 pF

Units

Min

Max

tPLH

Propagation Delay

tPHL

Sn to Zn32

tPLH

Propagation Delay

tPHL

In to Zn15

tPZH

Output Enable Time

tPZL

OE to Zn

tPHZ

Output Disable Time

tPLZ

OE to Zn

Functional Description

The ’LS353 contains two identical 4-input multiplexers with

TRI-STATE outputs They select two bits from four sources

selected by common Select inputs (S0 S1) The 4-input

multiplexers have individual Output Enable (OEa) OEb) in-

puts which when HIGH force the outputs to a high imped-

ance (high Z) state The logic equations for the outputs are

shown below

If the outputs of TRI-STATE devices are tied together all

but one device must be in the high impedance state to avoid

high currents that would exceed the maximum ratings De-

signers should ensure that Output Enable signals to TRI-

STATE devices whose outputs are tied together are de-

signed so that there is no overlap

Za e OEa (I0a S1 S0 a I1a S1 S0 a I2a S1 S0 a I3a S1 S0)

Zb e OEb (I0b S1 S0 a I1b S1 S0 a I2b S1 S0 a I3b S1 S0)

Truth Table

Select

Data Inputs

Output

Inputs

Enable

XXXX

(Z)

XXX

XLX

XHX

XLX

XHX

XXX

Address inputs S0 and S1 are common to both sections

H e HIGH Voltage Level

L e LOW Voltage Level

X e Immaterial

(Z) e High Impedance

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