Data Sheet #: TM053

Page 4 of 20

Rev: 00

Date: 5 / 14 / 03

Pin Description

Table 5

Pin #

Connection

Description

1

HOLD OVER

Indicator output. High output when Hold Over mode is selected by control pins.

2

REF 1

Indicator output. High output when Ref 1 mode is selected by control pins.

3

REF 2

Indicator output. High output when Ref 2 mode is selected by control pins.

4

FREE RUN

Indicator output. High output when Free Run mode is selected by control pins.

5

GND

Ground

6

ALARM _OUT

Alarm output. High output if module is in Free Run, or Hold Over, or LOR, or LOL, or

PLL_TVL mode.

7

CNTL A

Mode control input

8

CNTL B

Mode control input

9

PLL_TVL

Tuning Voltage Limit alarm output. High output when Sync_Out is near the extreme

10% ranges of the Pull-in/Hold-in range.

10

GND

Ground

11

SYNC_OUT

Primary timing output signal. Signal is synchronized to reference.

12

GND

Ground

13

CLK_OUT

Stratum 3 TCXO output (non-synchronized output, Frequency = SYNC_OUT)

14

GND

Ground

15

EX_REF_2

External Input Reference #2

16

GND

Ground

17

EX_REF_1

External Input Reference #1

18

V

CC

+5V dc supply

Typical Application

Figure 2

RCV

RCV

Clockout

Clockout

MUX

#1

#N

S

Y

MUX

#1

#N

S

Y

CW’s STM/MSTM module

Timing Card #1

CW’s SCG

2500/4500

Line Card #1

CW’s SCG

2500/4500

Line Card #N

CW’s STM/MSTM module

Timing Card #2

System Select

BITS

System

Signal

Input Select