78P2253-IGT Просмотр технического описания (PDF) - TDK Corporation

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78P2253-IGT

E4/STM-1/STS-3/OC-3 Transceiver

TDK Corporation 

78P2253

E4/STM-1/STS-3/OC-3

Transceiver

PIN DESCRIPTION (continued)

REFERENCE CLOCK PINS

NAME

PIN

TYPE

XTAL1

5

A

XTAL2

6

CKIN

9

CI

DESCRIPTION

Crystal Pins. Connect as in Figure 1a.

Reference clock input. The crystal oscillator connections should be

left open.

CONTROL AND STATUS PINS

NAME

PIN

TYPE

RLBACK

41

CI

LLBACK

42

CI

HUB/HOST

2

CI

CMI/ECL

E4/SONET

8BIT/$BIT

LOS

1

CI

64

CI

CI

39

CO

DESCRIPTION

Loopback receiver output to transmitter input.

Loopback transmitter output to receiver input. Disabled when

HUB/HOST is low or RLBACK is high.

In HUB mode (input high) the transmit reference clock is derived from

the CKIN pin or the crystal oscillator. In HOST mode (input low) the

transmit reference clock is derived from the recovered receive clock.

Selects CMI (input high) or ECL (input low) modes.

When high, E4 (139.264 Mbit/s) operation is selected. When low,

STM-1/STS-3/OC-3 (155.52Mbit/s) operation is selected.

Selects 8 bit parallel data when high and 4 bit parallel mode when

low. In serial mode this pin is ignored.

High during a loss-of-signal condition.

ANALOG PINS

NAME

RFO

LF

PIN

TYPE DESCRIPTION

46

A

External reference resistor.

44

A

PLL loop filter capacitor.

POWER SUPPLY PINS

It is recommended that all VCC pins be connected to a single power supply plane and all GND pins be connected

to a single ground plane.

NAME

VCC

GND

PIN

43

4, 7, 21,

29, 45,

47, 48,

58, 61

TYPE

S

S

DESCRIPTION

Power Supply.

Ground.

5

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