SN54F621, SN74F621

OCTAL BUS TRANSCEIVERS

WITH OPEN-COLLECTOR OUTPUTS

SDFS004B – D2932, MARCH 1987 – REVISED OCTOBER 1993

2–3

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54F621

SN74F621

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = – 18 mA

– 1.2

– 1.2

V

IOH

VCC = 4.5 V,

VOH = 5.5 V

250

250

µA

A1 A8

IOL = 20 mA

0.3

0.5

VOL

A1 – A8

VCC =4 5V

IOL = 24 mA

0.35

0.5

V

VOL

B1 B8

VCC = 4.5 V

IOL = 48 mA

0.38

0.55

V

B1 – B8

IOL = 64 mA

0.42

0.55

II

A and B ports

VCC =5 5V

VI = 5.5 V

1

1

mA

II

OEAB or OEBA

VCC = 5.5 V

VI = 7 V

0.1

0.1

mA

I

‡

A and B ports

VCC =5 5V

VI =2 7V

70

70

µA

IIH‡

OEAB or OEBA

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

I ‡

A and B ports

VCC =5 5V

VI =0 5V

– 0.65

– 0.65

mA

IIL‡

OEAB or OEBA

VCC = 5.5 V,

VI = 0.5 V

– 0.6

– 0.6

mA

ICCH

VCC = 5.5 V

105

140

105

140

mA

ICCL

VCC = 5.5 V

105

140

105

140

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.

switching characteristics (see Note 2)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

CL = 50 pF,

RL = 500 Ω,

TA = 25°C

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

RL = 500 Ω,

TA = MIN to MAX§

UNIT

(INPUT)

(OUTPUT)

′F621

SN54F621

SN74F621

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

A

B

6

9.5

12

5.5

13

5.5

13

ns

tPHL

A

B

2.5

3.8

8

2

8.5

2

8.5

ns

tPLH

B

A

6

9

12

5.5

12.5

5.5

12.5

ns

tPHL

B

A

2.5

4

7.5

2

8

2

8

ns

tPLH

OEBA

A

6

10

13.5

5.5

14

5.5

14

ns

tPHL

OEBA

A

3.5

6.5

10.5

2.5

11

2.5

11

ns

tPLH

OEAB

B

7

12

15

6

17

6

17

ns

tPHL

OEAB

B

3.5

6.5

9.5

3

10

3

10

ns

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

NOTE 2: Load circuits and waveforms are shown in Section 1.