XRT8001 データシートの表示（PDF） - Exar Corporation

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XRT8001

WAN Clock for T1 and E1 Systems

Exar Corporation 

XRT8001

WAN Clock for T1 and E1 Systems

GENERAL DESCRIPTION

The XRT8001 WAN Clock is a dual-phase-locked loop

chip that generates two very low jitter output clock

signals that can be used for synchronization clocks in

wide area networking systems. The XRT8001 has pre-

programmed multipliers and dividers that are selected

via the serial port. It generates two integer multiples of

8kHz, 56kHz, and 64kHz while locked onto an incom-

ing reference of 1.54MHz (T1), 2.048MHz (E1), 8kHz,

56kHz, or 64kHz

The XRT8001 WAN Clock can be configured to oper-

ate in one of six modes:

1. The Forward/Master Mode

2. The Reverse/Master Mode

3. The “Fractional T1/E1" Reverse/Master Mode

4. The “E1 to T1 - Forward/Master" Mode

5. The “High Speed - Reverse" Mode

6. The “Slave” Mode

FEATURES

• Dual Phased Locked Loops with

Pre-Programmed Multipliers and Dividers

• Pre-Programmed with Popular Frequency

Conversions for Communications Systems

October 2001-1

• Generates Output Clock Frequencies Ranging

From 8kHz up to 16.384MHz

• Serial Port Control for Optimal Performance

• Sync Output: 8kHz or 64kHz

• Low Jitter

• Cascadable (Master / Slave Modes)

• No External Components Needed

• Pin Compatible with the XRT8000

• Low Power (3.3V or 5V): 40 - 100mW

• - 40°C to +85°C Temperature Range

• 18-Lead PDIP or SOIC Packages

APPLICATIONS

• T1/E1 Access Equipment (DSU/CSU)

• Frame Relay Access Devices (FRAD)

• Basic Rate and Primary Rate ISDN Equipment

• ISDN Routers

• Terminals

• Remote Access Servers

• T1/E1 Concentrators

• T1/E1 Multiplexers

• T1/E1 Clock Rate Converters

• Internal Timing Generators

• System Synchronizers

3.3V or 5V

Reference Clock

8kHz to 16.384 MHz

Sync Out

8kHz or 64kHz

V CC

FIN

3

XRT8001

SYNC

2

CLK1

6

CLK2

13

Clock Output 1

Clock Output 2

Master/Slave

MSB

8

LOCKDET

11

CS SDO SDI SCLK

µC/µ P Serial I/O

PLL Lock Detect

Figure 1. System Diagram

ORDERING INFORMATION

Part Number

XRT8001IP

XRT8001ID

Package

18-Lead 300 Mil PDIP

18-Lead 300 Mil JEDEC SOIC

Operating Temperature Range

-40°C to +85°C

-40°C to +85°C

Rev. 1.01

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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