UT54ACTS193 datasheet(1/10 Pages) AEROFLEX

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Standard Products

UT54ACS193/UT54ACTS193

Synchronous 4-Bit Up-Down Dual Clock Counters

Datasheet

November 2010

www.aeroflex.com/logic

FEATURES

Look-ahead circuitry enhances cascaded counters

Fully synchronous in count modes

Parallel asynchronous load for modulo-N count lengths

Asynchronous clear

1.2μ CMOS (ACTS193) and .6μm CRH CMOS process

(ACS193)

- Latchup immune

High speed

Low power consumption

Single 5 volt supply

Available QML Q or V processes

Flexible package

- 16-pin DIP

- 16-lead flatpack

UT54ACS193 - SMD 5962-96566

UT54ACTS193 - SMD 5962-96567

DESCRIPTION

The UT54ACS193 and the UT54ACTS193 are synchronous 4-

bit, binary reversible up-down binary counters. Synchronous

operation is provided by having all flip-flops clocked

simultaneously so that the outputs change coincident with each

other when instructed. Synchronous operation eliminates the

output counting spikes normally associated with asynchronous

counters.

The outputs of the four flip-flops are triggered on a low-to-high-

level transition of either count input (Up or Down). The direc-

tion of the counting is determined by which count input is pulsed

while the other count input is high.

The counters are fully programmable. 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 to

agree with the data inputs independently of the count pulses.

Asynchronous loading allows the counters to be used as modulo-

N dividers by simply modifying the count length with the preset

inputs.

A clear input has been provided that forces all outputs to the low

level when a high level is applied. The clear function is inde-

pendent of the count and the load inputs.

The counter is designed for efficient cascading without the need

for external circuitry. The borrow output (BO) produces a low-

level pulse while the count is zero and the down input is low.

Similarly, the carry output (CO) produces a low-level pulse

while the count is maximum

PINOUTS

16-Pin DIP

Top View

16-Lead Flatpack

Top View

FUNCTION TABLE

FUNCTION

CLOCK

UP

CLOCK

DOWN

CLR

LOAD

Count Up

↑

H

L

H

Count Down

H

↑

L

H

Reset

X

H

X

Load Preset

Input

X

L

1

2

3

4

5

7

6

16

15

14

13

12

10

11

B

QB

QA

DOWN

UP

QC

QD

VDD

A

CLR

BO

CO

C

8

9

VSS

D

LOAD

1

2

3

4

5

7

6

16

15

14

13

12

10

11

VDD

89

B

QB

QA

DOWN

UP

QC

QD

A

CLR

BO

CO

LOAD

C

VSS

D

Số phần tương tự - UT54ACTS193

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