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Standard Products

UT54ACS299E

CMOS 8-bit Universal Shift/Storage Register with Three-State Outputs

Datasheet

July 2, 2013

www.aeroflex.com/Logic

FEATURES

 Common parallel I/O for reduced pin count

 Additional serial inputs and outputs for expansion

 Three-state outputs for bus-oriented applications

 Operate with outputs enabled or at high impedance

 Four operating modes: shift left, shift right, load and store

 Can be cascaded for n-bit word lengths

- Total dose: 100K rad(Si)

- Single Event Latchup immune

 Applications:

- Stacked or push-down registers

- Buffer storage

- Accumulator registers

 Output source/sink 24mA

 Available QML Q or V processes

 Standard Microcircuit Drawing 5962-06238

 Package:

- 20-lead flatpack

DESCRIPTION

The UT54ACS299E 8-bit shift/storage register is built using

gy and is ideal for space applications. The UT54ACS299E is an

8-bit universal shift/storage register featuring multiplexed I/O

ports to achieve full 8-bit data handling in a single 20-pin pack-

age. Two function-select (S0, S1) inputs and two output enable

(OE1, OE2) inputs can be used to choose the mode of operation

listed in the function table. Additional outputs are provided for

flip flops Q0, Q7 to allow easy serial cascading. A separate

active low master reset (MR) is used to reset the register, over-

riding the select and CP inputs. All flip-flops are brought out

through three-state buffers to separate I/O pins that also serve

as data inputs in the parallel load mode. All other state changes

are initiated by the rising edge of the clock.

LOGIC SYMBOL

PIN DESCRIPTION

Pin Names

Description

CP

Clock Pulse Input

DS0

Serial Data Input for Right Shift

DS7

Serial Data Input for Left Shift

S0, S1

Mode Select Inputs

MR

Asynchronous Master Reset

OE1, OE2

Three-State Output Enable Inputs

IO0-IO7

Parallel Data Inputs or Three-State Parallel Out-

puts

Q0, Q7

Serial Outputs

MR

OE1

R

6, 13

I01

I03

I04

I05

I06

DS7

Q7

I07

I02

3, 4D

12, 13

2, 4D

Z12

3, 4D

Z6

I00

5, 13

3, 4D

1, 4D

DS0

Z5

Q0

OE2

&

S0

S1

CP

SRG8

3EN13

0

1

C4/1

/2

M

0

3

(9)

(2)

(3)

(19)

(12)

(1)

(6)

(14)

(5)

(4)

(16)

(15)

(18)

(17)

(8)

(11)

(7)

(13)