5-521

FAST AND LS TTL DATA

OCTAL TRANSPARENT LATCH

WITH 3-STATE OUTPUTS;

OCTAL D-TYPE FLIP-FLOP

WITH 3-STATE OUTPUT

The SN54 / 74LS373 consists of eight latches with 3-state outputs for bus

organized system applications. The flip-flops appear transparent to the data

(data changes asynchronously) when Latch Enable (LE) is HIGH. When LE is

LOW, the data that meets the setup times is latched. Data appears on the bus

when the Output Enable (OE) is LOW. When OE is HIGH the bus output is in

the high impedance state.

The SN54 / 74LS374 is a high-speed, low-power Octal D-type Flip-Flop fea-

turing separate D-type inputs for each flip-flop and 3-state outputs for bus ori-

ented applications. A buffered Clock (CP) and Output Enable (OE) is common

to all flip-flops. The SN54 / 74LS374 is manufactured using advanced Low

Power Schottky technology and is compatible with all Motorola TTL families.

PIN NAMES

LOADING (Note a)

HIGH

LOW

D0 – D7

LE

CP

OE

O0 – O7

Data Inputs

Latch Enable (Active HIGH) Input

Clock (Active HIGH going edge) Input

Output Enable (Active LOW) Input

Outputs (Note b)

0.5 U.L.

0.5 U.L.

0.5 U.L.

0.5 U.L.

65 (25) U.L.

0.25 U.L.

0.25 U.L.

0.25 U.L.

0.25 U.L.

15 (7.5) U.L.

NOTES:

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

µA HIGH/1.6 mA LOW.

b) The Output LOW drive factor is 7.5 U.L. for Military (54) and 25 U.L. for Commercial

(74) Temperature Ranges. The Output HIGH drive factor is 25 U.L. for Military (54) and

65 U.L. for Commercial (74) Temperature Ranges.

CONNECTION DIAGRAM DIP (TOP VIEW)

SN54 / 74LS373

SN54 / 74LS374

18

17

16

15

14

13

1

2

3

4

5

6

7

20

19

8

VCC

OE

O7 D7 D6 O6

D5

O5

D4

O0 D0 D1 O1 O2 D2 D3

9

10

O3 GND

12

O4 LE

18

17

16

15

14

13

1

2

3

4

5

6

7

20

19

8

VCC

OE

O7 D7 D6 O6

D5

O5

D4

O0 D0 D1 O1 O2 D2 D3

9

10

O3 GND

12

11

O4 CP

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

11

SN54/74LS373

SN54/74LS374

OCTAL TRANSPARENT LATCH

WITH 3-STATE OUTPUTS;

OCTAL D-TYPE FLIP-FLOP

WITH 3-STATE OUTPUT

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