PI5C32245Q View Datasheet(PDF) - Pericom Semiconductor

Part Name

Description

View to exact match

PI5C32245Q

8-Bit, 2-Port Bus Switch with 25Ω Series Resistor

Pericom Semiconductor 

PI5C32245

8-BIT, 2-PORT BusSwitch

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Power Supply Characteristics

Parameters Description

Test Conditions(1)

1 Min. Typ(2) Max. Units

ICC

Quiescent Power

Supply Current

∆ICC

Supply Current per

Input @ TTL HIGH

VCC = Max.

VCC = Max.

VIN = GND or VCC

VIN = 3.4V(3)

0.1 3.0 µA

2

2.5 mA

ICCD

Supply Current per

Input per MHz(4)

VCC = Max.,

A and B Pins Open

BE = GND

Control Input Toggling

50% Duty Cycle

3 0.25 mA/

MHz

4

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.

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3. Per TTL driven input (VIN = 3.4V, control inputs only); A and B pins do not contribute to Icc.

4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified

frequency. The A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is

guaranteed by design.

6

Switching Characteristics over Operating Range

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Parameters

Description

tPLH

Propagation Delay(2,3)

tPHL

Ax to Bx, Bx to Ax

tPZH

Bus Enable Time

tPZL

BE to Ax or Bx

tPHZ

Bus Disable Time

tPLZ

BE to Ax or Bx

Conditions(1)

CL = 50 pF

RL = 500Ω

PI5C32245

Com.

Min.

Max. Unit

1.25

ns

1.5

7.5

ns

1.5

5.5

ns

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 0.25 ns for 50 pF 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.

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Pericom Semiconductor Corporation

2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com

151

PS8136 08/20/97

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