DM54LS161AJ National Semiconductor, DM54LS161AJ Datasheet

DM54LS161AJ

Manufacturer Part Number

DM54LS161AJ

Description

Synchronous 4-Bit Binary Counters

Manufacturer

National Semiconductor

Datasheet

1.DM54LS161AJ.pdf (10 pages)

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C 1995 National Semiconductor Corporation

DM54161 DM74161 DM74163

Synchronous 4-Bit Counters

General Description

These synchronous presettable counters feature an inter-

nal carry look-ahead for application in high-speed counting

designs The 161 and 163 are 4-bit binary counters The

carry output is decoded by means of a NOR gate thus pre-

venting spikes during the normal counting mode of opera-

tion Synchronous operation is provided by having all flip-

flops clocked simultaneously so that the outputs change co-

incident with each other when so instructed by the count-

enable inputs and internal gating This mode of operation

eliminates the output counting spikes which are normally

associated with asynchronous (ripple clock) counters A

buffered clock input triggers the four flip-flops on the rising

(positive-going) edge of the clock input waveform

These counters are fully programmable that is the outputs

may be preset to either level As presetting is synchronous

setting up a low level at the load input disables the counter

and causes the outputs to agree with the setup data after

the next clock pulse regardless of the levels of the enable

input The clear function for the 161 is asynchronous and a

low level at the clear input sets all four of the flip-flop out-

puts low regardless of the levels of clock load or enable

inputs The clear function for the 163 is synchronous and a

low level at the clear input sets all four of the flip-flop out-

puts low after the next clock pulse regardless of the levels

of the enable inputs This synchronous clear allows the

count length to be modified easily as decoding the maxi-

mum count desired can be accomplished with one

Connection Diagram

TL F 6551

See NS Package Number J16A N16E or W16A

Order Number DM54161J DM54161W

DM74161N or DM74163N

Dual-In-Line Package

external NAND gate The gate output is connected to the

clear input to synchronously clear the counter to all low out-

puts Low-to-high transitions at the clear input of the 163 are

also permissible regardless of the logic levels on the clock

enable or load inputs

The carry look-ahead circuitry provides for cascading coun-

ters for n-bit synchronous applications without additional

gating Instrumental in accomplishing this function are two

count-enable inputs and a ripple carry output Both count-

enable inputs (P and T) must be high to count and input T is

fed forward to enable the ripple carry output The ripple car-

ry output thus enabled will produce a high-level output pulse

with a duration approximately equal to the high-level portion

of the Q

can be used to enable successive cascaded stages High-

to-low-level transitions at the enable P or T inputs of the 161

through 163 may occur regardless of the logic level on the

clock

Features

Synchronously programmable

Internal look-ahead for fast counting

Carry output for n-bit cascading

Synchronous counting

Load control line

Diode-clamped inputs

output This high-level overflow ripple carry pulse

TL F 6551 – 1

RRD-B30M105 Printed in U S A

October 1992

Related parts for DM54LS161AJ

DM54LS161AJ Summary of contents

Page 1

... Connection Diagram Order Number DM54161J DM54161W See NS Package Number J16A N16E or W16A C 1995 National Semiconductor Corporation TL F 6551 external NAND gate The gate output is connected to the clear input to synchronously clear the counter to all low out- ...

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 DM74 Storage Temperature Range Recommended Operating Conditions Symbol Parameter V Supply Voltage ...

Page 3

Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) (Continued) Symbol Parameter I Short Circuit V OS Output Current (Note 2) I Supply Current V CCH with Outputs High (Note 3) I Supply Current V CCL with ...

Page 4

Logic Diagrams 161 6551– 3 ...

Page 5

Logic Diagrams (Continued) 163 6551 – 8 ...

Page 6

Logic Diagrams (Continued) 161 163 Synchronous Binary Counters Typical Clear Preset Count and Inhibit Sequences (1) Clear outputs to zero (2) Reset to binary twelve (3) Count to thirteen fourteen fifteen zero one and two (4) Inhibit ...

Page 7

Parameter Measurement Information Note A The input pulses are supplied by generators having the following characteristics PRR Vary PRR to measure MAX Note B Outputs Q and carry are ...

Page 8

Parameter Measurement Information Note A The input pulses are supplied by generators having the following characteristics PRR Vary PRR to measure MAX Note B Enable P and enable T ...

Page 9

Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number DM54161J or DM54163AJ 16-Lead Molded Dual-In-Line Package (N) Order Number DM74161N or DM74163N NS Package Number J16A NS Package Number N16E 9 ...

Page 10

... 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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