PC87382 datasheet(61/72 Pages) NSC

61 / 72 page

8.0 Device Characteristics (Continued)

Revision 1.2

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8.2.6

Output, Open-Drain Buffer

Symbol: ODn

Output, Open-Drain output buffer, capable of sinking n mA. Output from these signals is open-drain and cannot be forced high.

8.2.7

Quick Switch

Symbol: QS.

8.2.8

Exceptions

1. All pins are 5V tolerant except for the pins with PCI (INPCI, OPCI) and Quick Switch (QS) buffer types.

2. All pins are back-drive protected, except for the pins with PCI (INPCI, OPCI) buffer types.

3. The following pins have an internal static pull-up resistor (when enabled) and therefore may have leakage current from

VDD (when VIN = 0): GPIO00-04, GPIO20-21, GPIO23, DLCLK, DLAD3-0, DLFRAME, DSERIRQ, DLDRQ, DCLKRUN,

DCLKOUT.

4. The following pins have an internal static pull-down resistor (when enabled) and therefore may have leakage current to

VSS (when VIN = VDD): DLRESET.

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

have leakage current to VDD (when VIN = 0): BADDR, TRIS, TEST.

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

7. In XOR Tree mode, the buffer type of the input pins participating in the XOR Tree (see Section 2.4.2 on page 16) is INT

(Input, TTL compatible), regardless of the buffer type of these pins in normal device operation mode; see Section 1.3 on

page 10.

8.2.9

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

Symbol

Parameter

Conditions

Typ

Max

Unit

RON

Switch On Resistance1

1. Not tested. Guaranteed by characterization.

VIN =0V

Ω

VIN =VDD

510

Ω

IIL

Input Leakage Current

Switch is on

±10

µA

PC87382 Datasheet(PDF) 61 Page - National Semiconductor (TI)

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