PI5C3383

5-Bit, 4-Port Bus Exchange Switch

3

PS7028G

12/10/04

Switching Characteristics over Operating Range

Parameters

Description

Com

Units

Min.

Typ.

Max

-

0.25

-

ns

Bus Enable Time BE to Cx or Dx

1.5

-

6.5

Bus Disable Time BE to Cx or Dx

1.5

-

5.5

Bus Exchange Time BX to Cx or Dx

1.5

-

6.5

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.

4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified frequency. The

A, B, C, and D inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.

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 0.25\ns 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.

Power Supply Characteristics

Parameters

Description

Min.

Typ.

Max.

Units

Quiescent Power

Supply Current

-

0.1

3.0

µA

Supply Current per

Input @ TTL HIGH

-

-

2.5

mA

Supply Current per

AB and CD pins Open

BE = GND

Control Input Toggling

50% Duty Cycle

-

-

0.25

mA/

MHz

Applications

Logic Inputs

The logic control inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a 5.0V supply, the control

or select pins may be driven low to 0V and high to 5.5V. Driving the control or select pins Rail-toRail minimizes power consump-

tion.

Power-Supply Sequencing

Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC before applying signals to the input/

output or control pins.