IDT54/74FCT621T/AT

FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.18

4

POWER SUPPLY CHARACTERISTICS

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

Quiescent Power Supply Current

—

0.5

2.0

mA

TTL Inputs HIGH

(3)

Dynamic Power Supply Current

(4)

Vcc = Max.

—

0.15

0.25

mA/MHz

Outputs Open

One Input Toggling

50% Duty Cycle

Total Power Supply Current

(6,7)

Vcc = Max.

—

1.5

3.5

mA

Outputs Open

One Bit Toggling

—

1.8

4.5

50% Duty Cycle

Vcc = Max.

—

3.0

6.0

(5)

Outputs Open

Eight Bits Toggling

—

5.0

14.0

(5)

50% Duty Cycle

NOTES:

2538 tbl 06

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

°C ambient.

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.

7. This test is performed with outputs tied to GND through a pull-down resistor.

IDT54/74FCT621T

IDT54/74FCT621AT

Com’l.

Mil.

Com’l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max. Min.

(2)

Max.

Unit

Propagation Delay A to B

5.5

13.0

5.5

13.5

5.5

12.0

5.5

12.5

ns

Ω

1.5

8.5

1.5

9.5

1.5

6.8

1.5

7.6

Propagation Delay B to A

5.5

12.5

5.5

13.0

5.5

12.0

5.5

12.5

ns

1.5

8.0

1.5

9.0

1.5

6.4

1.5

7.2

Propagation Delay

GBA to A

5.5

14.0

5.5

14.5

5.5

13.0

5.5

13.5

ns

1.5

8.5

1.5

9.5

1.5

6.8

1.5

7.6

Propagation Delay GAB to B

5.5

14.0

5.5

14.5

5.5

13.0

5.5

13.5

ns

1.5

8.0

1.5

9.0

1.5

6.4

1.5

7.2

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

NOTES:

1. See test circuit and waveforms.

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

2538 tbl 07