IDT74FCT646ASOB datasheet(6/8 Pages) IDT

Part #	IDT74FCT646ASOB

Description	FAST CMOS OCTAL TRANSCEIVER/REGISTER

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Manufacturer	IDT [Integrated Device Technology]

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7.18

6

IDT54/74FCT646/A/C

FAST CMOS OCTAL TRANSCEIVER/REGISTER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

54/74FCT646

54/74FCT646A

54/74FCT646C

Com’l.

Mil.

Com’l.

Mil.

Com’l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit

tPLH

Propagation

CL = 50 pF

2.0

9.0

2.0

11.0

2.0

6.3

2.0

7.7

1.5

5.4

1.5

6.0

ns

tPHL

Delay

RL = 500

Ω

Bus to Bus

tPZH

Output Enable

2.0

14.0

2.0

15.0

2.0

9.8

2.0

10.5

1.5

7.8

1.5

8.9

ns

tPZL

Time

G, DIR to

Bus

tPHZ

Output Disable

2.0

9.0

2.0

11.0

2.0

6.3

2.0

7.7

1.5

6.3

1.5

7.7

ns

tPLZ

Time

G, DIR to

Bus

tPLH

Propagation

2.0

9.0

2.0

10.0

2.0

6.3

2.0

7.0

1.5

5.7

1.5

6.3

ns

tPHL

Delay Clock

to Bus

tPLH

Propagation

2.0

11.0

2.0

12.0

2.0

7.7

2.0

8.4

1.5

6.2

1.5

7.0

ns

tPHL

Delay SBA or

SAB to Bus

tSU

Set-up Time

4.0

—

4.5

—

2.0

—

2.0

—

2.0

—

2.0

—

ns

HIGH or LOW

Bus to Clock

tH

Hold Time

2.0

—

2.0

—

1.5

—

1.5

—

1.5

—

1.5

—

ns

HIGH or LOW

Bus to Clock

tW

Clock Pulse

6.0

—

6.0

—

5.0

—

5.0

—

5.0

—

5.0

—

ns

Width HIGH or

LOW

NOTES:

2536 tbl 07

1. See test circuit and waveforms.

2. Minimum limits are guaranteed but not tested on Propagation Delays.

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