MT9040

Data Sheet

2

Zarlink Semiconductor Inc.

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

1,10,

23,31

Ground. 0 Volts. (Vss pads).

2

RST

Reset (Input). A logic low at this input resets the MT9040. To ensure proper operation, the

device must be reset after reference signal frequency changes and power-up. The RST pin

should be held low for a minimum of 300ns. While the RST pin is low, all frame pulses except

RST and TSP and all clock outputs except C6o, C16o and C19o are at logic high. The RST,

TSP, C6o and C16o are at logic low during reset. The C19o is free-running during reset.

Following a reset, the input reference source and output clocks and frame pulses are phase

aligned as shown in Figure 9.

3,4,5,

38,43

IC

Internal Connection. Leave open circuit.

6REF

Reference (Input). This is the input reference source (falling edge) used for synchronization.

One of four possible frequencies (8kHz, 1.544MHz, 2.048MHz or 19.44MHz) may be used.

7,17

28,35

8OSCo

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

connected from this pin to OSCi, see Figure 6. Not suitable for driving other devices. For clock

oscillator operation, this pin is left unconnected, see Figure 5.

9OSCi

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

from this pin to OSCo, see Figure 6. For clock oscillator operation, this pin is connected to a

clock source, see Figure 5.

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 11.

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

1

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

TRST

TDI

TDO

IC

IC

FS1

FS2

IC

IC

IC

MS

Vdd

IC

IC

NC

Vss

IC

IM

Vdd

RST

IC

IC

REF

Vdd

OSCo

OSCi

Vss

F16o

TSP

F8o

C1.5o

C2o

C4o

C19o

48

TMS

21

27

C6o

FLOCK

22

26

Vss

23

25

C8o

IC

24

C16o

MT9040AN

TCK

RSP

F0o

IC

Vdd

LOCK