DM74LS90

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DM74LS90 数据手册

June 1989

DM74LS90/DM74LS93

Decade and Binary Counters

General Description

Each of these monolithic counters contains four master-

slave flip-flops and additional gating to provide a divide-by-

two counter and a three-stage binary counter for which the

count cycle length is divide-by-five for the ’LS90 and divide-

by-eight for the ’LS93.

count pulses are applied to input A and the outputs are as

described in the appropriate truth table. A symmetrical di-

vide-by-ten count can be obtained from the ’LS90 counters

by connecting the Q output to the A input and applying the

input count to the B input which gives a divide-by-ten square

wave at output Q .

All of these counters have a gated zero reset and the LS90

also has gated set-to-nine inputs for use in BCD nine’s com-

plement applications.

Features

Typical power dissipation 45 mW

To use their maximum count length (decade or four bit bina-

ry), the B input is connected to the Q output. The input

Count frequency 42 MHz

Connection Diagrams (Dual-In-Line Packages)

TL/F/6381–1

Order Number DM74LS90M or DM74LS90N

See NS Package Number M14A or N14A

TL/F/6381–2

Order Number DM74LS93M or DM74LS93N

See NS Package Number M14A or N14A

1995 National Semiconductor Corporation

TL/F/6381

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7...10

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型号	品牌	获取价格	描述	数据表
DM74LS90CW	FAIRCHILD	获取价格	暂无描述
DM74LS90J	TI	获取价格	IC,COUNTER,UP,DECADE,LS-TTL,DIP,14PIN,CERAMIC
DM74LS90J/A+	ETC	获取价格	Asynchronous Up Counter
DM74LS90M	NSC	获取价格	Decade and Binary Counters
DM74LS90M	TI	获取价格	LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 3-BIT UP DECADE COUNTER, PDSO14, 0.150 INCH, PLAST
DM74LS90M	FAIRCHILD	获取价格	Decade and Binary Counters
DM74LS90MX	FAIRCHILD	获取价格	Asynchronous Up Counter
DM74LS90N	FAIRCHILD	获取价格	Decade and Binary Counters
DM74LS90N	NSC	获取价格	Decade and Binary Counters
DM74LS90N	TI	获取价格	LS SERIES, ASYN NEGATIVE EDGE TRIGGERED 3-BIT UP DECADE COUNTER, PDIP14, PLASTIC, DIP-14