54LS160AFMQB datasheet(4/8 Pages) NSC

Numer części	54LS160AFMQB

Szczegółowy opis	Synchronous Presettable BCD Decade Counters

PDF	8 Pages

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Producent	NSC [National Semiconductor (TI)]

Strona internetowa	http://www.national.com

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Functional Description (Continued)

The Terminal Count (TC) output is HIGH when CET is HIGH

and the counter is in its maximum count state (9 for the

decade counters 15 for the binary counters) To implement

synchronous multistage counters the TC outputs can be

used with the CEP and CET inputs in two different ways

These two schemes are shown in the 9310 data sheet The

TC output is subject to decoding spikes due to internal race

conditions and is therefore not recommended for use as a

clock or asynchronous reset for flip-flops counters or regis-

ters In the decade counters of the ’LS160 ’LS162 the TC

output is fully decoded and can only be HIGH in state 9

LOGIC EQUATIONS

Count Enable e CEP

CET PE

TC e Q0

Q1 Q2 Q3 CET

Mode Select Table

CET

CEP

Action on the Rising

Clock Edge (

L )

RESET (Clear)

LOAD (Pn

xQn)

COUNT (Increment)

NO CHANGE (Hold)

For the ’LS162

H e HIGH Voltage Level

L e LOW Voltage Level

X e Immaterial

State Diagrams

’LS160 ’LS162

TLF10177 – 5

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