SC2200 datasheet(380/433 Pages) NSC

380 / 433 page

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380

Revision 3.0

Electrical Specifications (Continued)

Figure 8-13. V/I Curves for PCI Output Signals

Pull-Up

Pull-Down

Test Point

VIO

0.9

VIO

Drive Point

0.3

VIO

0.6

VIO

0.1

Drive Point

Test Point

VIO

Equation A

for VIO>VOUT>0.7VIO

IOL = (256/VIO)*VOUT*(VIO-VOUT)

for 0V<VOUT<0.18VIO

Volts

IOL mA

IOH mA

64VIO

16VIO

1.5

-12VIO

-48VIO

-0.5

IOH = (98.0/VIO)*(VOUT-VIO)*(VOUT+0.4VIO)

Equation B

Output Voltage

0.5VIO

Table 8-18. PCI Clock Parameters

Symbol

Parameter

Min

Max

Unit

Comments

tCYC

PCICLK Cycle time1

tHIGH

PCICLK High time2

tLOW

PCICLK Low time2

PCICLKsr

PCICLK Slew Rate3

V/ns

PCIRSTsr

PCIRST# Slew Rate4

mV/ns

Clock frequency is between nominal DC and 33 MHz. Device operational parameters at frequencies under 16 MHz are

not 100% tested. The clock can only be stopped in a low state.

Guaranteed by characterization.

Slew rate must be met across the minimum peak-to-peak portion of the clock waveform (see Figure 8-14).

The minimum PCIRST# slew rate applies only to the rising (deassertion) edge of the reset signal. See Figure 8-18

for PCIRST# timing.

SC2200 Datasheet(PDF) 380 Page - National Semiconductor (TI)

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