PC87393 datasheet(138/148 Pages) NSC

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9.0 Device Characteristics (Continued)

138

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6. Output from ACK, ERR (and PE if bit 2 of PP Confg0 Register is set to 1) is open-drain in all SPP modes, except in SPP

Compatible mode when the setup mode is ECP-based FIFO and bit 4 of the Control2 parallel port register is set to 1.

Otherwise, output from these signals is level 2. External 4.7 K

Ω pull-up resistors should be used.

7. Output from STB, AFD, INIT, SLIN is open-drain in all SPP modes, except in SPP Compatible mode when the setup

mode is ECP-based (FIFO). Otherwise, output from these signals is level 2. External 4.7 K

Ω pull-up resistors should be

used.

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

9.3

INTERNAL RESISTORS

9.3.1

Pull-Up Resistor

Symbol: PUnn.

9.3.2

Pull-Down Resistor

Symbol: PDnn.

Symbol

Parameter

Conditions

Min

Typical

Max

Unit

RPU

Pull-up equivalent resistance

VPIN =VDD = 3.3V

nn-30%

nn+30%

Ω

Symbol

Parameter

Conditions

Min

Typical

Max

Unit

RPD

Pull-down equivalent resistance

VPIN =0V, VDD = 3.3V nn-30%

nn+30%

Ω

PC87393 Datasheet(PDF) 138 Page - National Semiconductor (TI)

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