PI5C3244 Просмотр технического описания (PDF) - Pericom Semiconductor

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производитель

PI5C3244

8-Bit, 2-Port BusSwitch

Pericom Semiconductor 

PI5C3244

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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

3 0.25 mA/

MHz

BE1 or BE2 = GND

Control Input Toggling

50% Duty Cycle

4

Notes:

1. For conditions shown as Max. or Min., 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.

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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.

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Switching Characteristics over Operating Range

Parameters Description

Conditions(1)

PI5C3244

Com.

Min

Max Unit

tPLH

Propagation Delay(2,3) CL = 50 pF

tPHL

Ax to Bx

RL = 500ohm

tPZH

Bus Enable Time

1.5

tPZL

BEX to Ax or Bx

tPHZ

Bus Disable Time

1.5

tPLZ

BEX to Ax or Bx

0.25 ns

5.6

ns

5.2

ns

Notes:

1. See test circuit and wave forms.

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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PS7014C 09/2804

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