PM5345 datasheet(51/196 Pages) PMC

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PM5345 S/UNI-155

DATA SHEET

PMC-930305

ISSUE 4

SATURN USER NETWORK INTERFACE

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Pin Name

Type

No.

Function

VT2

Input

The transmit PECL logic low reference (VT2)

pin is used to control the logic low voltage level

of the output PECL pins, TXCO+/- and TXD+/-.

VT2 should be connected to TAVD1 through a

reference resistor. The PECL outputs can be

used in a 50

Ω controlled impedance

environment. Under these conditions, the

reference resistor value is recommended to be

630

Ω, ±1%. Additional details are provided in

the Interface Examples section.

TAVD1

Ref

The reference (TAVD1) pin for the transmit

PECL circuitry. TAVD1 should be connected to

the Transmit Analog Reference Supply.

TAVS1

Ground

The ground (TAVS1) pin for the transmit PECL

circuitry. TAVS1 should be connected to GND.

TAVD2

Power

The power (TAVD2) pin for the transmit PECL

driver pads TAVD2 should be connected to the

PECL Driver Supply (normally the +5V D.C.

digital supply).

TAVS2

Ground

The ground (TAVS2) pin for the transmit PECL

driver pads TAVS2 should be connected to

GND.

RAVD

Ref

141

The reference (RAVD) pin for the receive

PECL circuitry. RAVD should be connected to

the Receive Analog Reference Supply.

RAVS

Ground

140

The ground (RAVS) pin for the receive PECL

circuitry RAVS should be connected to GND.

Notes on Pin Description:

1. All S/UNI inputs and bidirectionals present minimum capacitive loading and

operate at TTL logic levels except for the TXCI+, TXCI-, RXC+, RXC-, RXD+,

and RXD- differential inputs which operate at pseudo ECL (PECL) logic

levels.

2. Most S/UNI digital outputs and bidirectionals have 4 mA drive capability,

except the POCLK and RCLK outputs which have 8 mA drive capability. All 4

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