PI5C3253C 查看數據表（PDF） - Pericom Semiconductor Corporation

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PI5C3253C

Dual 4:1 Mux/DeMux Bus Switch with –2V Undershoot Protection

Pericom Semiconductor Corporation 

PI5C3253C

Dual 4:1 Mux/DeMux Bus Switch

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Power Supply Characteristics

Parameters

Description

Test Conditions(1)

Min. Typ(2)

ICC

Quiescent Power Supply Current

VIN = GND or VCC ––

––

∆ICC

Supply Current per Input @ TTL HIGH

VCC = Max.

VIN = 3.4V(3)

–– ––

Notes:

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

2. Typical values are at VCC = 5.0V, +25°C ambient.

3. Per TTL driven input (VIN = 3.4V, control inputs only); I and Y pins do not contribute to ICC.

Max.

100

2.5

Units

µA

mA

Switching Characteristics over Operating Range

PI5C3253C

Parameters

tIY

Description

Propagation Delay(2,3)

In to Yn

Conditions(1)

Com.

Min.

Max.

0.25

Units

tSY

Bus Select time

Sn to Yn

tPZH

Bus Enable Time

tPZL

En to Yn

tPHZ

Bus Disable Time

tPLZ

En to Yn

CL = 50pF

RL = 500 ohms

0.5

4.5

ns

0.5

4.0

0.5

4.5

Notes:

1. See test circuit and waveforms.

2. This parameter is guaranteed but not tested on Propagation Delays.

3. The bus switch contributes no propagational 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 0.25ns for 50pF load. Since this time constant is much smaller than the rise/fall times of

typical driving signals, it adds very little propagational delay to the system. Propagational delay of 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.

Application Information

Logic Inputs

Logic control inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a 5.0V supply, the control or

select pins may be driven low to 0V and high to 5.5V. Driving the control or select pins Rail-toRail® minimizes power consumption.

Power -Supply Sequencing

Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC before applying

signals to the input/output or control pins.

3

PS8490C

11/17/04

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