74LS569 datasheet(3/8 Pages) MOTOROLA

3 / 8 page

5-575

FAST AND LS TTL DATA

SN54/74LS569A

DEFINITION OF FUNCTIONAL TERMS

A, B, C, D

The four programmable data inputs.

CEP

Count Enable Parallel. Can be used to

enable and inhibit counting in high speed

cascaded operation. CEP must be LOW to

count.

CET

Count Enable Trickle. Enables the ripple

carry output for cascaded operation. Must

be LOW to count.

Clock Pulse. All synchronous functions

occur on the LOW-to-HIGH transition of the

clock.

LOAD

Enables parallel load of counter outputs

from data inputs on the next clock edge.

Must be HIGH to count.

U/D

Up/Down Count Control. HIGH counts up

and LOW counts down.

ACLR

Asynchronous Clear. Master reset of

counters to zero when ACLR is LOW,

independent of the clock.

SCLR

Synchronous clear of counters to zero on

the next clock edge when SCLR is LOW.

A HIGH on the output control sets the four

counter outputs in the high impedance, and

a LOW, enables the output.

YA, YB, YC, YD The four counter outputs.

RCO

Ripple Carry Output. Output will be LOW on

the maximum count on up-count. Upon

down-count, RCO is LOW at 0000.

CCO

Clock Carry Output. While counting and

RCO is LOW, CCO will follow the clock

HIGH-LOW-HIGH transition.

Note: Actual current flow direction shown

DRIVING OUTPUT

DRIVEN INPUT

VCC

IOL

IOH

IOL

IOH IIL

IIH

LOW-POWER SCHOTTKY INPUT/OUTPUT

CURRENT INTERFACE CONDITIONS

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