5-433

FAST AND LS TTL DATA

8-BIT ADDRESSABLE LATCH

The SN54/ 74LS259 is a high-speed 8-Bit Addressable Latch designed for

general purpose storage applications in digital systems. It is a multifunctional

device capable of storing single line data in eight addressable latches, and

also a 1-of-8 decoder and demultiplexer with active HIGH outputs. The device

also incorporates an active LOW common Clear for resetting all latches, as

well as, an active LOW Enable.

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

Ao

C

E

D

Q7

Q5

Q6

Q4

A1

A2

Q0

Q1

Q2

Q3 GND

CONNECTION DIAGRAM DIP (TOP VIEW)

PIN NAMES

LOADING (Note a)

HIGH

LOW

A0, A1, A2

Address lnputs

0.5 U.L.

0.25 U.L.

D

Data Input

0.5 U.L.

0.25 U.L.

E

Enable (Active LOW) Input

1.0 U.L.

0.5 U.L.

C

Clear (Active LOW) input

0.5 U.L.

0.25 U.L.

Q0 to Q7

Parallel Latch Outputs (Note b)

10 U.L.

5 (2.5) 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.

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

25

125

70

°C

IOH

Output Current — High

54, 74

– 0.4

mA

IOL

Output Current — Low

54

74

4.0

8.0

mA

SN54/74LS259

8-BIT ADDRESSABLE LATCH

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

16

1

D SUFFIX

SOIC

CASE 751B-03