SN74ALS845

8-BIT BUS-INTERFACE D-TYPE LATCH

WITH 3-STATE OUTPUTS

SDAS233A – DECEMBER 1983 – REVISED JANUARY 1995

3

POST OFFICE BOX 655303

7 V

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

7 V

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

Voltage applied to a disabled 3-state output

5.5 V

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

0

°C to 70°C

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

Storage temperature range

– 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.

recommended operating conditions

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

V

VIH

High-level input voltage

2

V

VIL

Low-level input voltage

0.8

V

IOH

High-level output current

– 2.6

mA

IOL

Low level output current

24

mA

IOL

Low-level output current

48‡

mA

t

Pulse duration

CLR or PRE low

35

ns

tw

Pulse duration

LE high

20

ns

tsu

Setup time, data before LE

↓

10

ns

th

Hold time, data after LE

↓

5

ns

TA

Operating free-air temperature

0

70

°C

‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP§

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.2

V

VOH

VCC = 4.5 V to 5.5 V,

IOH = – 0.4 mA

VCC –2

V

VOH

VCC = 4.5 V,

IOH = – 2.6 mA

2.4

3.2

V

IOL = 12 mA

0.25

0.4

VOL

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

IOL = 48 mA‡

0.35

0.5

IOZH

VCC = 5.5 V,

VO = 2.7 V

20

µA

IOZL

VCC = 5.5 V,

VO = 0.4 V

–20

µA

II

VCC = 5.5 V,

VI = 7 V

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

µA

IIL

VCC = 5.5 V,

VI = 0.4 V

– 0.1

mA

IO¶

VCC = 5.5 V,

VO = 2.25 V

–30

–112

mA

Outputs high

21

36

ICC

VCC = 5.5 V

Outputs low

41

67

mA

Outputs disabled

25

42

‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V

§ All typical values are at VCC = 5 V, TA = 25°C.

¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.