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IDT54FCT646P

FAST CMOS OCTAL TRANSCEIVER/REGISTER

Integrated Device Technology 

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

Symbol

Parameter

Com’l.

Mil.

Com’l.

Mil.

Com’l.

Mil.

Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit

tPLH Propagation

tPHL

Delay

Bus to Bus

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

RL = 500Ω

tPZH Output Enable

tPZL

Time G, DIR to

Bus

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

tPHZ Output Disable

tPLZ

Time G, DIR to

Bus

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

tPLH Propagation

tPHL Delay Clock

to Bus

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

tPLH Propagation

tPHL Delay SBA or

SAB to Bus

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

tSU

Set-up Time

HIGH or LOW

Bus to Clock

4.0 — 4.5 — 2.0 — 2.0 — 2.0 — 2.0 — ns

tH

Hold Time

HIGH or LOW

Bus to Clock

2.0 — 2.0 — 1.5 — 1.5 — 1.5 — 1.5 — ns

tW

Clock Pulse

Width HIGH or

LOW

6.0 — 6.0 — 5.0 — 5.0 — 5.0 — 5.0 — ns

NOTES:

1. See test circuit and waveforms.

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

2536 tbl 07

7.18

6

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