54191DMQB National Semiconductor, 54191DMQB Datasheet

54191DMQB

Manufacturer Part Number

54191DMQB

Description

Synchronous Up/Down 4-Bit Binary Counter with Mode Control

Manufacturer

National Semiconductor

Datasheet

1.54191DMQB.pdf (6 pages)

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C 1995 National Semiconductor Corporation

54191 DM54191 DM74191 Synchronous Up Down

4-Bit Binary Counter with Mode Control

General Description

This circuit is a synchronous reversible up down counter

The 191 is a 4-bit binary counter Synchronous operation is

provided by having all flip-flops clocked simultaneously so

that the outputs change simultaneously when so instructed

by the steering logic This mode of operation eliminates the

output counting spikes normally associated with asynchro-

nous (ripple clock) counters

The outputs of the four master-slave flip-flops are triggered

on a low-to-high level transition of the clock input if the

enable input is low A high at the enable input inhibits count-

ing Level changes at either the enable input or the down

up input should be made only when the clock input is high

The direction of the count is determined by the level of the

down up input When low the counter counts up and when

high it counts down

This counter is fully programmable that is the outputs may

be preset to either level by placing a low on the load input

and entering the desired data at the data inputs The output

will change independent of the level of the clock input This

feature allows the counters to be used as modulo-N dividers

by simply modifying the count length with the preset inputs

The clock down up and load inputs are buffered to lower

the drive requirement which significantly reduces the num-

ber of clock drivers etc required for long parallel words

Connection Diagram

TL F 6562

See NS Package Number J16A N16E or W16A

Order Number 54191DMQB 54191FMQB

DM54191J DM54191W or DM74191N

Dual-In-Line Package

Two outputs have been made available to perform the cas-

cading function ripple clock and maximum minimum count

The latter output produces a high-level output pulse with a

duration approximately equal to one complete cycle of the

clock when the counter overflows or underflows The ripple

clock output produces a low-level output pulse equal in

width to the low-level portion of the clock input when an

overflow or underflow condition exists The counters can be

easily cascaded by feeding the ripple clock output to the

enable input of the succeeding counter if parallel clocking is

used or to the clock input if parallel enabling is used The

maximum minimum count output can be used to accom-

plish look-ahead for high-speed operation

Features

Single down up count control line

Count enable control input

Ripple clock output for cascading

Asynchronously presettable with load control

Parallel outputs

Cascadable for n-bit applications

Alternate Military Aerospace device (54191) is avail-

able Contact a National Semiconductor Sales Office

Distributor for specifications

TL F 6562 – 1

RRD-B30M105 Printed in U S A

June 1989

Related parts for 54191DMQB

54191DMQB Summary of contents

Page 1

... The clock down up and load inputs are buffered to lower the drive requirement which significantly reduces the num- ber of clock drivers etc required for long parallel words Connection Diagram Order Number 54191DMQB 54191FMQB See NS Package Number J16A N16E or W16A C 1995 National Semiconductor Corporation TL F 6562 ...

Page 2

... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range DM54 and 54 b DM74 Storage Temperature Range b Recommended Operating Conditions Symbol ...

Page 3

Switching Characteristics Symbol Parameter f Maximum Clock Frequency MAX t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PLH Low to High Level Output t ...

Page 4

Logic Diagram 191 Binary Counter TL F 6562– Pin (16) V Pin (8) GND ...

Page 5

... Timing Diagrams Typical Load Count and Inhibit Sequences Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54191DMQB or DM54191J 191 Decade Counter NS Package Number J16A 6562– 3 ...

Page 6

... Hong Kong Ltd 49) 0-180-530 85 86 13th Floor Straight Block a Ocean Centre 5 Canton Rd 49) 0-180-530 85 85 Tsimshatsui Kowloon a Tel ( 49) 0-180-532 78 32 Hong Kong a 49) 0-180-532 93 58 Tel (852) 2737-1600 a Tel ( 49) 0-180-534 16 80 Fax (852) 2736-9960 a National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 ...

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