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ST2349QTR Scheda tecnica(PDF) 7 Page - STMicroelectronics |
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ST2349QTR Scheda tecnica(HTML) 7 Page - STMicroelectronics |
7 / 23 page ST2349 Supplementary notes 7/23 3 Supplementary notes 3.1 Driver requirement The ST2349 may be driven by an open drain or totem pole driver and the nature of the device’s output is “open drain”. It must not be used to drive a pull-down resistor since 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 the 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 the V IL requirements of the ST2349. 3.2 Load driving capability To support the open drain system, the one-shot transistor is turned on only during state transition at the output side. When it drives a high state, after the one-shot transistor is turned off, only the pull-up resistor is able to maintain the state. In this case, the resistive load is not recommended. 3.3 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 will be 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. 3.4 Truth table Table 3. Truth table Enable Bi-directional Input/Output OE I/OVCC I/OVL H (1) 1. High level VL power supply referred H (2) 2. High level VCC power supply referred H(1) H(1) L L L Z (3) 3. Z = high impedance Z(3) |
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