SN74ALS234

64 × 4 ASYNCHRONOUS FIRST IN, FIRST OUT MEMORY

SDAS106B − OCTOBER 1986 − REVISED SEPTEMBER 1993

7

POST OFFICE BOX 655303

POST OFFICE BOX 1443

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

Q outputs

− 2.6

mA

IOH

High-level output current

IR and OR

− 0.4

mA

IOL

Low-level output current

Q outputs

24

mA

IOL

Low-level output current

IR and OR

8

mA

fclock

Clock frequency

SI or SO

0

30

MHz

tw

Pulse duration

SI or SO

High or low

15

ns

tw

Pulse duration

RST

Low

15

ns

tsu

Setup time before SI

↑

Data

0

ns

tsu

Setup time before SI

↑

RST

High (inactive)

15

ns

th

Hold time, data after SI

↑

17

ns

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

Any Q

VCC = 4.5 V

IOH = − 1 mA

VOH

Any Q

VCC = 4.5 V

IOH = − 2.6 mA

2.4

3.2

V

VOH

IR, OR

VCC = 4.5 V,

IOH = − 0.4 mA

2.7

3.4

V

Any Q

VCC = 4.5 V

IOL = 12 mA

0.25

0.4

VOL

Any Q

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

VOL

IR, OR

VCC = 4.5 V

IOL = 4 mA

0.25

0.4

V

IR, OR

VCC = 4.5 V

IOL = 8 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

Low

100

145

ICC

VCC = 5.5 V

High

97

142

mA

ICC

Disabled

103

148

mA

† 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.