4

INDUSTRIALTEMPERATURERANGE

IDT74FCT645T/AT/CT/DT

FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER

NOTES:

1. See test circuit and waveforms.

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

3. This parameter is guaranteed but not tested.

POWER SUPPLY CHARACTERISTICS

Symbol

Parameter

Min.

Max.

Unit

Quiescent Power Supply Current

TTL Inputs HIGH

—0.5

2

mA

Outputs Open

—

0.15

0.25

mA/

MHz

OE = T/R = GND

One Input Toggling

50% Duty Cycle

—1.5

3.5

mA

Outputs Open

fi = 10MHz

50% Duty Cycle

—

1.8

4.5

OE = T/R = GND

One Bit Toggling

—3

Outputs Open

fi = 2.5MHz

50% Duty Cycle

—

5

OE = T/R = GND

Eight Bits Toggling

NOTES:

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.

All currents are in milliamps and all frequencies are in megahertz.

SWITCHING CHARACTRISTICS OVER OPERATING RANGE

FCT645T

FCT645AT

FCT645CT

FCT645DT

Symbol

Parameter

Max.

Max.

Max.

Max.

Unit

Propagation Delay

A to B, B to A

Ω

1.5

9.5

1.5

4.6

1.5

4.1

1.5

3.8

ns

Output Enable Time

OE to A or B

1.5

11

1.5

6.2

1.5

5.8

1.5

5

ns

Output Disable Time

OE to A or B

1.5

12

1.5

5

1.5

4.8

1.5

4.3

ns

Output Enable Time

T/

1.5

11

1.5

6.2

1.5

5.8

1.5

5

ns

Output Disable Time

T/

1.5

12

1.5

5

1.5

4.8

1.5

4.3

ns