ST2149B datasheet(9/23 Pages) STMICROELECTRONICS

부품명	ST2149B

상세설명	4-bit dual supply level translator without direction control pin

PDF	23 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

Logo

9 / 23 page

ST2149B

Supplementary notes

Doc ID 023310 Rev 1

9/23

Supplementary notes

4.1

Driver requirement

For proper operation, the driver from each side of the device must be able 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 kΩ output buffer.

4.2

Load driving capability

To support the architecture that allows level translation without the 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

Ω resistor maintains the output logic state.

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

Ω is not recommended for proper

operation.

4.3

Truth table

Table 3.

Truth table

Enable

Bi-directional input/output

I/OVCC

I/OVL

H(1)

High level VL power supply referred.

H(2)

High level VCC power supply referred.

H(1)

LZ(3)

Z = high impedance.

Z(3)

ST2149B 데이터시트(PDF) 9 Page - STMicroelectronics