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IDT74FST163244

16-BIT BUS SWITCH

Integrated Device Technology 

IDT74FST163244

16-BIT BUS SWITCH

COMMERCIAL TEMPERATURE RANGE

SWITHCING CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Commercial: TA = –40°C to +85°C, VCC = 5.0V ±10%

Symbol

Description

Condition(1)

Min.(2)

Typ.

Max.

Unit

tPLH Data Propagation Delay

tPHL

A to B, B to A(3,4)

CL = 50pF

—

RL = 500Ω

—

0.25

ns

tPZH Switch Turn on Delay

tPZL

xOE to xBx

1.5

—

6.5

ns

tPHZ

tPLZ

|QCI|

Switch Turn off Delay

xOE to xBx

Charge Injection, Typical(5,7)

1.5

—

—

1.5

7

ns

—

pC

|QDCI| Charge Injection, Typical(6,7)

—

0.5

—

NOTES:

3615 tbl 07

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 MΩ scope probe, VIN = 0.0 volts.

6. Measured at switch turn off through bus multiplexer, (e.g.- A to 1B = >A to 2B), load = 50 pF in parallel with 10 MΩ scope probe, VIN at A = 0.0 volts. Charge

injection is reduced because the injection from the turn off of the A to 1B switch is compensated by the turn on of the A to 2B switch.

7. Characterized parameter. Not 100% tested.

4

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