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PI5C33X257B

12-Channel, 2:1 Mux/DeMux Bus Switch

Pericom Semiconductor 

PI5C33X257

12 Channel, 2:1 Mux/DeMux Bus Switch

Power Supply Characteristics

Parameters Description

ICC

Quiescent Power

Supply Current

ΔICC

Supply Current per

Input @ TTL HIGH

ICCD

Supply Current per

Input per MHz(4)

Test Conditions(1)

VCC = Max.

VIN = GND or VCC

Min. Typ(2) Max. Units

0.1 3.0 µA

VCC = Max.

VIN = 3.4V(3)

2.5 mA

VCC = Max.,

I and Y Pins Open

BE = 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); I and Y 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 I and Y 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

tIY

Propagation Delay(2,3)

In to Yn

tSY

Bus Select Time

Sn to Yn

tPZH

Bus Disable Time

tPZL

E to Yn

tPHZ

Bus Disable Time

tPLZ

E to Yn

Conditions(1)

CL = 50 pF

RL = 500-ohm

PI5C33X257

Com.

Min.

Max. Unit

0.25 ns

0.5

5.2 ns

0.5

4.8 ns

0.5

5.0 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 0.25ns 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.

06-0237

3

PS8114C 11/03/06

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