SN74ALS870

DUAL 16-BY-4 REGISTER FILES

SDAS139A – DECEMBER 1982 – REVISED JANUARY 1995

4

POST OFFICE BOX 655303

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

tw

Pulse duration, write

12

ns

Address before write

↓

5

tsu

Setup time

Data before write

↑

15

ns

Select before write

↓

12

Address before write

↓

0

th

Hold time

Data before write

↑

0

ns

Select before write

↓

12

TA

Operating free-air temperature

0

70

°C

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

VOL

VCC = 4.5 V,

IOL = 24 mA

0.35

0.5

V

II

Control inputs

VCC =5 5V

VI = 7 V

0.1

mA

II

DQA and DQB ports

VCC = 5.5 V

VI = 5.5 V

0.2

mA

1W and 2W

20

IIH

Other control inputs

VCC = 5.5 V,

VI = 2.7 V

40

µA

DQA and DQB ports‡

50

IIL

Control inputs

VCC =5 5V

VI =0 4V

– 0.2

mA

IIL

DQA and DQB ports‡

VCC = 5.5 V,

VI = 0.4 V

– 0.2

mA

IO§

VCC = 5.5 V,

VO = 2.25 V

–30

–112

mA

ICC

VCC = 5.5 V

80

110

mA

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

‡ For I/O ports, the parameters IIH and IIL include the off-state output current.

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