PI5C16244 Просмотр технического описания (PDF) - Pericom Semiconductor

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PI5C16244

16-bit bus switch

Pericom Semiconductor 

PI5C16244/162244

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Power Supply Characteristics

Parameters Description

Test Conditions(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

—

0.1

3.0

µA

VIN = 3.4V(3)

— — 2.5 mA

ICCD

Supply Current per

Input per MHz(4)

VCC = Max.,

A and B Pins Open

nBE = 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.

PI5C16244 Switching Characteristics over Operating Range

Parameters

tPLH

tPHL

tPZH

tPZL

tPHZ

tPLZ

Description

Propagation Delay(2,3)

xAx to xBx

Bus Enable Time

XBE to xAx or xBx

Bus Disable Time

XBE to xAx or xBx

Conditions(1)

CL = 50 pF

RL = 500Ω

PI5C16244

Com.

Min

Max

Unit

—

0.25

ns

1.5

5.6

ns

1.5

5.2

ns

PI5C162244 Switching Characteristics over Operating Range

Parameters Description

Conditions(1)

PI5C162244

Com.

Min

Max

Unit

tPLH

Propagation Delay(2,3)

CL = 50 pF

—

1.25

ns

tPHL

xAx to xBx

RL = 500Ω

tPZH

Bus Enable Time

1.5

5.6

ns

tPZL

XBE to xAx or xBx

tPHZ

Bus Disable Time

1.5

5.2

ns

tPLZ

XBE to xAx or xBx

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

124

PS7024B 09/17/96

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