PC87591L datasheet(376/437 Pages) NSC

376 / 437 page

7.0 Device Specifications (Continued)

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376

Revision 1.07

7.2.7

Output, Open-Drain Buffer

Symbol: ODn

Output, TTL-compatible open-drain output buffer, capable of sinking n mA. Output from these signals is open-drain and

is never forced high.

7.2.8

Output, PCI 3.3V

Symbol: OPCI I

7.2.9

Exceptions

1. All pins are back-drive protected, except for output pins with PCI buffer type (INPCI or OPCI), oscillator (OOSC) and all

analog type pins (ODA and ODI).

2. The following pins have an internal static pull-up resistor and therefore may have leakage current to VCC (when VIN = 0):

SCL1-2, SDA1-2, IOPA7-0, IOPB7-0, IOPC7-0, IOPD7-0, IOPE7-4, IOPF7-0, KBSIN0-7, PSCLK1-4, PSDAT1-4.

3. The following strap pins have an internal static pull-down resistor enabled during Power-Up reset and therefore may have

leakage current to VSS (when VIN = VSUP): BADDR1-0, ENV1-0, SHBM, TRIS.

4. IOH is valid for a GPIO pin only when it is not configured as open-drain.

7.2.10 Terminology

Back-Drive Protection. A pin that is back-drive protected does not sink current into the supply when an input voltage higher

than the supply, but below the pin’s maximum input voltage, is applied to the pin. This is true even when the supply is inac-

tive. Note that active pull-up resistors and active output buffers are typically not back-drive protected.

5-Volt Tolerance. An input signal that is 5V tolerant can operate with input voltage of up to 5V even though the supply to

the device is only 3.3V. The actual maximum input voltage allowed to be supplied to the pin is indicated by the maximum

high voltage allowed for the input buffer. Note that some pins have multiple buffers, not all of which are 5V tolerant. In such

cases, there is a note that indicates at what conditions a 5V input may be applied to the pin; if there is no note, the low max-

imum voltage among the buffers is the maximum voltage allowed for the pin.

Symbol

Parameter

Conditions

Min

Max

Unit

VOL

Output Low Voltage

IOL = n mA

0.4

IOL =50 µA

0.2

Symbol

Parameter

Conditions

Min

Max

Unit

VOH

Output High Voltage

lout = −500 µA

0.9 VDD

VOL

Output Low Voltage

lout = 1500 µA

0.1 VDD

PC87591L Datasheet(PDF) 376 Page - National Semiconductor (TI)

PC87591L Datasheet(HTML) 376 Page - National Semiconductor (TI)

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