SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623

OCTAL BUS TRANSCEIVERS

SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995

6

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN74ALS621A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.5

V

IOH

VCC = 4.5 V,

VOH = 5.5 V

0.1

mA

VOL

VCC =4 5V

IOL = 24 mA

0.35

0.5

V

VOL

VCC = 4.5 V

IOL = 48 mA‡

0.35

0.5

V

II

Control inputs

VCC =5 5V

VI = 7 V

0.1

mA

II

A or B ports

VCC = 5.5 V

VI = 5.5 V

0.1

mA

IIH

Control inputs

VCC =5 5V

VI =2 7V

20

µA

IIH

A or B ports§

VCC = 5.5 V,

VI = 2.7 V

20

µA

IIL

Control inputs

VCC =5 5V

VI =0 4V

– 0.1

mA

IIL

A or B ports§

VCC = 5.5 V,

VI = 0.4 V

– 0.1

mA

ICC

VCC =5 5V

Outputs high

29

40

mA

ICC

VCC = 5.5 V

Outputs low

35

48

mA

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

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

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

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

TA = MIN to MAX¶

UNIT

(INPUT)

(OUTPUT)

SN74ALS621A

MIN

MAX

tPLH

A

B

10

33

ns

tPHL

A

B

5

20

ns

tPLH

B

A

10

33

ns

tPHL

B

A

5

20

ns

tPLH

OEBA

A

10

39

ns

tPHL

OEBA

A

12

35

ns

tPLH

OEAB

B

10

39

ns

tPHL

OEAB

B

12

35

ns

¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.