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Vedi Specifiche Tecniche

JM38510/32701B2A +BOM

Counter IC Counter, Decade 2 Element 4 Bit Negative Edge 20-LCCC (8.89x8.89)

Produttore:

Texas Instruments
ProduttorePart #:

JM38510/32701B2A
Scheda dati:

JM38510/32701B2A Scheda dati (PDF)
Series:

54LS
Logic Type:

Counter, Decade
Direction:

Up
Number Of Elements:

2

JM38510/32701B2A Descrizione generale

Each of these monolithic circuits contains eight master-slave flip-flops and additional gating to implement two individual four-bit counters in a single package. The '390 and 'LS390 incorporate dual divide-by-two and divide-by-five counters, which can be used to implement cycle lengths equal to any whole and/or cumulative multiples of 2 and/or 5 up to divide-by-100. When connected as a bi-quinary counter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage. The '393 and 'LS393 each comprise two independent four-bit binary counters each having a clear and a clock input. N-bit binary counters can be implemented with each package providing the capability of divide-by-256. The '390, 'LS390, '393, and 'LS393 have parallel outputs from each counter stage so that any submultiple of the input count frequency is available for system-timing signals. Series 54 and Series 54LS circuits are characterized for operation over the full military temperature range of -55°C to 125°C; Series 74 and Series 74LS circuits are characterized for operation from 0°C to 70°C.

Caratteristiche principali

Dual Versions of the Popular '90A, 'LS90 and '93A, 'LS93
'390, 'LS390 … Individual Clocks for A and B Flip-Flops Provide Dual ÷ 2 and ÷ 5 Counters
'393, 'LS393 … Dual 4-Bit Binary Counter with Individual Clocks
All Have Direct Clear for Each 4-Bit Counter
Dual 4-Bit Versions Can Significantly Improve System Densities by Reducing Counter Package Count by 50%
Typical Maximum Count Frequency … 35 MHz
Buffered Outputs Reduce Possibility of Collector Commutation

Specifiche

Series	54LS	Logic Type	Counter, Decade
Direction	Up	Number of Elements	2
Number of Bits per Element	4	Reset	Asynchronous
Timing	-	Count Rate	35 MHz
Trigger Type	Negative Edge	Voltage - Supply	4.5 V ~ 5.5 V
Operating Temperature	-55°C ~ 125°C (TA)	Mounting Type	Surface Mount
Base Product Number	JM38510

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