PI5C3244 Просмотр технического описания (PDF) - Pericom Semiconductor Corporation

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PI5C3244

8-Bit/ 2-Port Switch

Pericom Semiconductor Corporation 

PI5C3244

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Power Supply Characteristics

Parameters Description

ICC

Quiescent Power

Supply Current

∆ICC

Supply Current per

Input @ TTL HIGH

ICCD

Supply Current per

Input per MHz(4)

Test Conditions(1)

VCC = Max.

VIN = GND or VCC

VCC = Max.

VIN = 3.4V(3)

VCC = Max.,

A and B Pins Open

BE1 or BE2 = GND

Control Input Toggling

50% Duty Cycle

Min. Typ(2) Max. Units

0.1 3.0 µA

2.5 mA

0.25 mA/

MHz

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.

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

tPLH

tPHL

tPZH

tPZL

tPHZ

tPLZ

Description

Propagation Delay(2,3)

Ax to Bx

Bus Enable Time

BEX to Ax or Bx

Bus Disable Time

BEX to Ax or Bx

Conditions(1)

CL = 50 pF

RL = 500Ω

PI5C3244

Com.

Min

Max

Unit

0.25

ns

1.5

5.6

ns

1.5

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.

Pericom Semiconductor Corporation

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

142

PS7014A 03/13/96

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