ST2129B datasheet(8/21 Pages) STMICROELECTRONICS

부품명	ST2129B

상세설명	2-bit dual supply level translator without direction control pin, push-pull output

PDF	21 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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8 / 21 page

Supplementary notes

ST2129B

8/21

DocID023308 Rev 2

Supplementary notes

3.1

Driver requirement

For proper operation, the driver from each side of the device must have the capability to

source and sink a minimum of 1 mA current. The device architecture requires the driver to

source/sink maximum current of (VCC/4) mA to/from the weak 4 k output buffer.

3.2

Load driving capability

To support the architecture that allows level translation without direction pin, the one-shot

transistor is turned ON only during state transition at the output side. After the one-shot

transistor is turned OFF, only the 4 k

 resistor maintains the output logic state. So, 

a resistive load or pull-up resistor less than 50 k

 is not recommended for proper operation.

3.3

Truth table

Table 3. Truth table

Enable

Bi-directional input/output

I/OVCC

I/OVL

H(1)

1. High level VL power supply referred.

H(2)

2. High level VCC power supply referred.

H(1)

Z(3)

3. Z = high impedance.

Z(3)

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