FXL2T245 Просмотр технического описания (PDF) - ON Semiconductor

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FXL2T245

Low-Voltage, Dual-Supply, 2-Bit, Signal Translator with Configurable Voltage Supplies and Signal Levels and 3-State Outputs

ON Semiconductor 

Functional Description

Power-Up / Power-Down Sequencing

Due to the chip design, the FXL2T245 translator offers

the advantage of either VCC being powered up first.

When either VCC is at 0 V, outputs are in a high-

impedance state. The control inputs (T/R and OE) are

designed to track the VCCA supply. A pull-up resistor

tying OE to VCCA should be used to ensure that bus

contention, excessive currents, or oscillations do not

occur during power-up/power-down. The size of the pull-

up resistor is based upon the current-sinking capability

of the OE driver.

The recommended power-up sequence is:

1. Apply power to either VCC.

2. Apply power to the T/R input (logic HIGH for A-to-B

operation; logic LOW for B-to-A operation) and to

the respective data inputs (A port or B port). This

may occur at the same time as step 1.

3. Apply power to the other VCC.

4. Drive the OE input LOW to enable the device.

The recommended power-down sequence is:

1. Drive OE input HIGH to disable the device.

2. Remove power from either VCC.

3. Remove power from the other VCC.

© 2005 Fairchild Semiconductor Corporation

FXL2T245 • Rev. 1.0.2

3

www.fairchildsemi.com

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