ST2329I datasheet(7/22 Pages) STMICROELECTRONICS

номер детали	ST2329I

подробное описание детали	2-bit dual-supply level translator with auto-direction feature and integrated pull-up

PDF	22 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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ST2329I

Pin configuration

Doc ID 018508 Rev 1

7/22

Figure 3.

Typical application diagram

External pull-up resistors are optional. Only needed if a pull-up value lower than 10 k

Ω is desired.

2.1

Supplementary notes

2.1.1

Driver requirements

The ST2329I may be driven by an open drain or totem pole driver and the nature of the

device output is “open drain”. It must not be used to drive a pull-down resistor as the

impedance of the output at HIGH state depends on the pull-up resistor placed at the I/Os.

As the device has pull-up resistors on both I/OVCC and I/OVL ports, the user needs to ensure

that the driver is able to sink the required amount of current. For example, if the settings are

VCC = 5.5 V, VL = 4.3 V, and the pull-up resistor is 10 kΩ, then the driver must be able to sink

at least (5.5 V / 10 k

Ω) + (4.3 V / 10 kΩ) ≈ 1 mA and still meet VIL requirements of ST2329I.

2.1.2

Load driving capability

To support the open drain system, the one-shot transistor is turned on only during high

transition at the output side. When it drives a high state, after the one-shot transistor turned

off, only the pull-up resistor is able to maintain the state. In this case, the resistive load is not

recommended.

2.1.3

Power-off feature

In some applications where it might be required to turn off one of the power supplies

powering up the level translator, the user may turn OFF the VCC only when the OE pin is low

(device is disabled). There is no current consumption in VL due to floating gates or other

causes, and the I/Os are in a high impedance state in this mode.

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