5-479

FAST AND LS TTL DATA

8-BIT SHIFT/STORAGE REGISTER

WITH 3-STATE OUTPUTS

The SN54 / 74LS299 is an 8-Bit Universal Shift / Storage Register with

3-state outputs. Four modes of operation are possible: hold (store), shift left,

shift right and load data.

The parallel load inputs and flip-flop outputs are multiplexed to reduce the

total number of package pins. Separate outputs are provided for flip-flops Q0

and Q7 to allow easy cascading. A separate active LOW Master Reset is used

to reset the register.

Cascading

CONNECTION DIAGRAM DIP (TOP VIEW)

18

17

16

15

14

13

1

2

3

4

5

6

7

20

19

8

VCC

S0

S1 Ds7 Q7 I/O7

I/O3

I/O5

I/O1

OE1 OE2 I/O6 I/O4 I/O2 I/O0 Q0

9

10

MR GND

12

11

CP DS0

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

PIN NAMES

LOADING (Note a)

HIGH

LOW

CP

Clock Pulse (active positive-going edge) Input

0.5 U.L.

0.25 U.L.

DS0

Serial Data Input for Right Shift

0.5 U.L.

0.25 U.L.

DS7

Serial Data Input for Left Shift

0.5 U.L.

0.25 U.L.

I/On

Parallel Data Input or

Parallel Output (3-State) (Note c)

0.5 U.L.

65 (25) U.L.

0.25 U.L.

15 (7.5) U.L.

OE1, OE2

3-State Output Enable (active LOW) Inputs

0.5 U.L.

0.25 U.L.

Q0, Q7

Serial Outputs (Note b)

10 U.L.

5 (2.5) U.L.

MR

Asynchronous Master Reset (active LOW) Input

0.5 U.L.

0.25 U.L.

S0, S1

Mode Select Inputs

1 U.L.

0.5 U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40

µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 2.5 U.L for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges.

c) The Output LOW drive factor is 7.5 U.L for Military (54) and 15 U.L. for Commercial (74). The Output HIGH drive factor is 25 U.L. for Military (54) and 65 U.L. for

Commercial (74) Temperature Ranges.

SN54/74LS299

8-BIT SHIFT/STORAGE REGISTER

WITH 3-STATE OUTPUTS

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03