PI74LVC3245AS datasheet(6/9 Pages) PERICOM

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ADVANCE INFORMATION

PI74LVC3245A

8-Bit Dual Supply Bus Transceiver

with 3-State Outputs

P-0.3

08/05/03

PARAMETER MEASUREMENT INFORMATION FOR A TO B PORT

VCCA =2.7V TO 3.6V and VCCB = 5V ± 0.5V

Load Circuit

Voltage Waveforms

Propagation Delay Times

Voltage Waveforms

Enable and Disable Times

Notes:

A. CL includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. All input impulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50Ω, tR ≤ 2.5ns, tF ≤ 2.5ns.

D. The outputs are measured one at a time with one transition per measurement.

Figure 1. Load Circuit and Voltage Waveforms

500Ω

500

Ω

2xVCCB

Open

GND

From Output

Under Test

CL = 50pF

(See Note A)

500Ω

Input

tPLH

tPHL

B-Port

Output

VOH

VOL

1.5V

2.7V

50% VCCB

tPZL

Output

Control

1.5V

50% VCCB

1.5V

tPLZ

tPHZ

VOL

VCCB

tPZH

+0.3V

–0.3V

Output

Waveform 1

S1 at 2 x VCCB

(see Note B)

Output

Waveform 2

S1 at GND

(see Note B)

VOH

VOL

2.7V

50% VCCB

Power- Up Considerations

To avoid excessive supply current, bus contention or oscillation during power-up, the following guidelines should be followed:

1. Connect ground first before any supply voltage is applied.

2. Power up VCCA, which is the control side of the device.

3. Ramp OE ahead of or with VCCA to help prevent bus contention

4. Ramp DIR with VCCA if DIR high is needed (A bus to B bus). Otherwise keep DIR Low.

Test

tPLH/tPHL

Open

tPLZ/tPZL

2 x VCCB

tPHZ/tPZH

GND

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