dm74ls169a Fairchild Semiconductor, dm74ls169a Datasheet

dm74ls169a

Manufacturer Part Number

dm74ls169a

Description

Synchronous 4-bit Up/down Binary Counter

Manufacturer

Fairchild Semiconductor

Datasheet

1.DM74LS169A.pdf (8 pages)

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DM74LS169A

Synchronous 4-Bit Up/Down Binary Counter

General Description

This synchronous presettable counter features an internal

carry look-ahead for cascading in high-speed counting appli-

cations. Synchronous operation is provided by having all

flip-flops clocked simultaneously, so that the outputs all

change at the same time when so instructed by the

count-enable inputs and internal gating. This mode of opera-

tion helps eliminate the output counting spikes that are nor-

mally associated with asynchronous (ripple clock) counters.

A buffered clock input triggers the four master-slave flip-flops

on the rising edge of the clock waveform.

This counter is fully programmable; that is, the outputs may

each be preset either high or low. The load input circuitry al-

lows loading with the carry-enable output of cascaded

counters. As loading is synchronous, setting up a low level at

the load input disables the counter and causes the outputs to

agree with the data inputs after the next clock pulse.

The carry look-ahead circuitry permits cascading counters

for n-bit synchronous applications without additional gating.

Both count-enable inputs (P and T) must be low to count.

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

up/down input. When the input is high, the counter counts

up; when low, it counts down. Input T is fed forward to enable

Connection Diagram

DM54LS169AJ, DM54LS169AW, DM74LS169AM or DM74LS169AN

Order Number 54LS169DMQB, 54LS169FMQB, 54LS169LMQB,

See Package Number E20A, J16A, M16A, N16E or W16A

DS006401

Dual-In-Line Package

the carry outputs. The carry output thus enabled will produce

a low-level output pulse with a duration approximately equal

to the high portion of the Q

approximately equal to the low portion of the Q

counting down. This low-level overflow carry pulse can be

used to enable successively cascaded stages. Transitions at

the enable P or T inputs are allowed regardless of the level

of the clock input. All inputs are diode clamped to minimize

transmission-line effects, thereby simplifying system design.

This counter features a fully independent clock circuit.

Changes at control inputs (enable P, enable T, load, up/

down), which modify the operating mode, have no effect until

clocking occurs. The function of the counter (whether en-

abled, disabled, loading, or counting) will be dictated solely

by the conditions meeting the stable setup and hold times.

Features

n Fully synchronous operation for counting and

n Internal look-ahead for fast counting.

n Carry output for n-bit cascading.

n Fully independent clock circuit

programming.

DS006401-1

output when counting up, and

www.fairchildsemi.com

output when

April 1998

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dm74ls169a Summary of contents

Page 1

... When the input is high, the counter counts up; when low, it counts down. Input T is fed forward to enable Connection Diagram Order Number 54LS169DMQB, 54LS169FMQB, 54LS169LMQB, DM54LS169AJ, DM54LS169AW, DM74LS169AM or DM74LS169AN See Package Number E20A, J16A, M16A, N16E or W16A © 1998 Fairchild Semiconductor Corporation DS006401 the carry outputs ...

Page 2

... Others I = Max Enable 2.7V Others I = Max Enable 0.4V Others I = Max DM54 CC DM74 = Max(Note −55˚C to +125˚C 0˚C to +70˚C −65˚C to +150˚C DM74LS169A Units Min Nom Max 4. 0.8 V −0 MHz 0 20 MHz ...

Page 3

Switching Characteristic = 5V and T = 25˚C (for Test Waveforms and Output Load Symbol Parameter f Maximum Clock MAX Frequency t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL ...

Page 4

Logic Diagram www.fairchildsemi.com LS169A Binary Counter 4 DS006401-2 ...

Page 5

Timing Diagram Typical Load, Count, and Inhibit Sequences LS169A Binary Counters 5 DS006401-3 www.fairchildsemi.com ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted Order Number 54LS169DMQB or DM54LS169AJ www.fairchildsemi.com Ceramic Leadless Chip Carrier Package (E) Order Number 54LS169LMQB Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Package Number J16A 6 ...

Page 7

... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Molded Package (M) 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS169AM Package Number M16A Order Number DM74LS169AN Package Number N16E 7 www.fairchildsemi.com ...

Page 8

... A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system affect its safety or effectiveness. Fairchild Semiconductor Hong Kong Ltd. Fax: +49 (0) 1 80-530 85 86 13th Floor, Straight Block, Email: europe ...

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