AX2000 datasheet(54/262 Pages) MICROSEMI

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Detailed Specifications

2- 40

R e v i sio n 1 8

3.3 V PCI, 3.3 V PCI-X

Peripheral Component Interface for 3.3 V standard specifies support for both 33 MHz and 66 MHz PCI

bus applications. It uses an LVTTL input buffer and a push-pull output buffer. The input and output buffers

are 5 V tolerant with the aid of external components. Axcelerator 3.3 V PCI and 3.3 V PCI-X buffers are

compliant with the PCI Local Bus Specification Rev. 2.1.

The PCI Compliance Specification requires the clamp diodes to be able to withstand for 11 ns, –3.5 V in

undershoot, and 7.1 V in overshoot.

AC Loadings

Table 2-33 • DC Input and Output Levels

VIL

VIH

VOL

VOH

IOL

IOH

Min., V

Max., V

Min., V

Max., V

Min., V

PCI

–0.3

0.3 VCCI

0.5 VCCI

VCCI + 0.5

(per PCI specification)

PCI-X

–0.5

0.35 VCCI

0.5 VCCI

VCCI + 0.5

(per PCI specification)

Figure 2-18 • AC Test Loads

Table 2-34 • AC Waveforms, Measuring Points, and Capacitive Loads

Input Low (V)

Input High (V)

Measuring Point* (V)

VREF (typ) (V)

Cload (pF)

(Per PCI Spec and PCI-X Spec)

N/A

Note:

* Measuring Point = VTRIP

R to VCCI for tpl

R to GND for tph

10 pF

GND

Test point for data

R = 25

35 pF for tpzl / tpzh

5 pF for tphz / tplz

R to VCCI for tplz / tpzl

R to GND for tphz / tpzh

Test Point

for tristate

R = 1k

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