PI5C32X245B 데이터 시트보기 (PDF) - Pericom Semiconductor

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PI5C32X245B

16-Bit, 2-Port BusSwitch

Pericom Semiconductor 

PI5C32X245

16-Bit, 2-Port BusSwitch

Power Supply Characteristics

Parameters

Description

Test Conditions(1)

Min. Typ(2) Max. Units

ICC

Quiescent Power

Supply Current

VCC = Max.

VIN = GND or VCC

0.1

3.0

µA

ΔICC

Supply Current per

Input @ TTL HIGH

VCC = Max.

VIN = 3.4V(3)

2.5

mA

ICCD

Supply Current per

Input per MHz(4)

VCC = Max.,

A and B Pins Open

BEn = GND

Control Input Toggling

50% Duty Cycle

0.25

mA/

MHz

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); 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.

Switching Characteristics over Operating Range

Parameters

Description

Conditions(1)

Com.

Unit

Min.

Max.

tPLH

Propagation Delay(2,3)

tPHL

Ax to Bx, Bx to Ax

—

0.25

tPZH

Bus Enable Time

tPZL

BEX to Ax or Bx

CL = 50pF

RL = 500Ω

1.5

6.5

ns

tPHZ

Bus Disable Time

tPLZ

BEx to Ax or Bx

1.5

5.5

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.

3

PS7057E

09/16/04

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