MT9043

Data Sheet

3

Zarlink Semiconductor Inc.

9OSCi

Oscillator Master Clock (CMOS Input). For crystal operation, a 20MHz crystal is

connected from this pin to OSCo, see Figure 9. For clock oscillator operation, this pin is

connected to a clock source, see Figure 8.

11

F16o

Frame Pulse ST-BUS 8.192 Mb/s (CMOS Output). This is an 8kHz 61ns active low framing

pulse, which marks the beginning of an ST-BUS frame. This is typically used for ST-BUS

operation at 8.192 Mb/s. See Figure 14.

12

F0o

Frame Pulse ST-BUS 2.048Mb/s (CMOS Output). This is an 8kHz 244ns active low framing

pulse, which marks the beginning of an ST-BUS frame. This is typically used for ST-BUS

operation at 2.048Mb/s and 4.096Mb/s. See Figure 14.

13

RSP

Receive Sync Pulse (CMOS Output). This is an 8kHz 488ns active high framing pulse,

which marks the beginning of an ST-BUS frame. This is typically used for connection to the

Siemens MUNICH-32 device. See Figure 15.

14

TSP

Transmit Sync Pulse (CMOS Output). This is an 8kHz 488ns active high framing pulse,

which marks the beginning of an ST-BUS frame. This is typically used for connection to the

Siemens MUNICH-32 device. See Figure 15.

15

F8o

Frame Pulse (CMOS Output). This is an 8kHz 122ns active high framing pulse, which marks

the beginning of a frame. See Figure 14.

16

C1.5o

Clock 1.544MHz (CMOS Output). This output is used in T1 applications.

18

LOCK

Lock Indicator (CMOS Output). This output goes high when the PLL is frequency locked to

the input reference.

19

C2o

Clock 2.048MHz (CMOS Output). This output is used for ST-BUS operation at 2.048Mb/s.

20

C4o

Clock 4.096MHz (CMOS Output). This output is used for ST-BUS operation at 2.048Mb/s

and 4.096Mb/s.

21

C19o

Clock 19.44MHz (CMOS Output). This output is used in OC3/STS3 applications.

22

FLOCK

Fast Lock Mode (Input). Set high to allow the PLL to quickly lock to the input reference (less

than 500 ms locking time).

24

IC

Internal Connection. Tie low for normal operation.

25

C8o

Clock 8.192MHz (CMOS Output). This output is used for ST-BUS operation at 8.192Mb/s.

26

C16o

Clock 16.384MHz (CMOS Output). This output is used for ST-BUS operation with a

16.384MHz clock.

27

C6o

Clock 6.312 Mhz (CMOS Output). This output is used for DS2 applications.

29

IM

Impairment Monitor (CMOS Output). A logic high on this pin indicates that the Input

Impairment Monitor has automatically put the device into Freerun Mode.

30

IC

Internal Connection. Tie high for normal operation.

32

NC

No Connection. Leave open circuit.

33,34

IC

Internal Connection. Tie low for normal operation.

36

MS

Mode/Control Select (Input). This input determines the state (Normal or Freerun) of

operation. The logic level at this input is gated in by the rising edge of F8o. See Table 3.

37

IC

Internal Connection. Tie low for normal operation.

Pin Description

Pin #

Name

Description