SN54LS373, SN54LS374, SN54S373, SN54S374,

SN74LS373, SN74LS374, SN74S373, SN74S374

OCTAL D-TYPE TRANSPARENT LATCHES AND EDGE-TRIGGERED FLIP-FLOPS

SDLS165B – OCTOBER 1975 – REVISED AUGUST 2002

6

POST OFFICE BOX 655303

(’LS devices)

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Off-state output voltage

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance,

70

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DW package

58

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package

69

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NS package

60

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. Voltage values are with respect to network ground terminal.

2. The package thermal impedance is calculated in accordance with JESD 51-7.

recommended operating conditions

SN54LS’

SN74LS’

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5

4.75

5

5.25

V

VOH

High-level output voltage

5.5

5.5

V

IOH

High-level output current

–1

–2.6

mA

IOL

Low-level output current

12

24

mA

t

Pulse duration

CLK high

15

15

ns

tw

Pulse duration

CLK low

15

15

ns

t

Data setup time

’LS373

5

↓

5

↓

ns

tsu

Data setup time

’LS374

20

↑

20

↑

ns

th

Data hold time

’LS373

20

↓

20

↓

ns

th

Data hold time

’LS374‡

5

↑

0

↑

ns

TA

Operating free-air temperature

–55

125

0

70

°C

‡ The th specification applies only for data frequency below 10 MHz. Designs above 10 MHz should use a minimum of 5 ns (commercial only).