4

IDT74FST163383, IDT74FST1632383

20-BIT BUS EXCHANGE SWITCH

COMMERCIAL TEMPERATURE RANGE

POWER SUPPLY CHARACTERISTICS

NOTES:

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.

N = Number of Switches Toggling at fi

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

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Symbol

Parameter

Min.

Max.

Unit

Quiescent Power Supply Current

TTL Inputs HIGH

—

0.5

1.5

mA

Dynamic Power Supply

Outputs Open

—30

40

µA/

MHz/

Enable Pin Toggling

50% Duty Cycle

Switch

Outputs Open

Enable Pins Toggling

—

6.0

8.0

mA

(20 Switches Toggling)

fi = 10MHz

50% Duty Cycle

—

6.5

9.5

3474 tbl 06

163383

1632383

Symbol

Description

Typ.

Max.

Unit

Data Propagation Delay

Ω

—

—

0.25

1.25

ns

Switch Multiplex Delay

BX to Ai, Bi, Ci, Di

1.5

—

6.5

7.5

ns

Switch Turn on Delay

BE to Ai, Bi, Ci, Di

1.5

—

6.5

7.5

ns

Switch Turn off Delay

1.5

—

5.5

5.5

ns

—

1.5

—

—

pC

—

0.5

—

—

3474 tbl 07

NOTES:

1. See test circuit and waveforms.

2. Minimum limits guaranteed but not tested.

3. This parameter is guaranteed by design but not tested.

4. The bus switch contributes no propagation delay other than the RC delay of the on resistance of the switch and the load capacitance. The time constant

for the switch alone is of the order of 2.5ns for 50pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals,

it adds very little propagation delay to the system. Propagation delay on the bus switch when used in a system is determined by the driving circuit on the

driving side of the switch and its interaction with the load on the driven side.

5. Measured at switch turn off, load = 50 pF in parallel with 10 M

6. Measured at switch turn off through bus multiplexer, (e.g.- A to C = >A to D), load = 50 pF in parallel with 10 M

injection is reduced because the injection from the turn off of the A to C switch is compensated by the turn on of the B to C switch.

7. Characterized parameter. Not 100% tested.