PI5C3257CL Просмотр технического описания (PDF) - Pericom Semiconductor

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PI5C3257CL

Quad 2:1 Mux/Demux BusSwitch with –2V Undershoot Protection

Pericom Semiconductor 

PI5C3257

Quad 2:1 Mux/Demux BusSwitch

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Power Supply Characteristics

Parameters Description

ICC

Quiescent Power

Supply Current

∆ICC

Supply Current per

Input @ TTL HIGH

Test Conditions(1)

VCC = Max.

VIN = GND or VCC

VCC = Max.

VIN = 3.4V(3)

Min. Typ(2) Max. Units

100 µA

2.5 mA

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.

Switching Characteristics over Operating Range

Parameters Description

Conditions(1)

PI5C3257C

Com.

Min

Max

Units

tIY

Propagation Delay(2,3)

CL = 50pF

IN to YN

RL = 500ohms

tSY

Bus Select Time

7.0

SN to YN

tPZH

Bus Disable Time

7.0

tPZL

E to YN

tPHZ

Bus Disable Time

1.5

tPLZ

E to YN

0.25

30.0

ns

30.0

8.8

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.

Applications Information

Logic Inputs

The 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 R 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

PS8513 02/21/01

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