MT9040 Data Sheet
3
Zarlink Semiconductor Inc.
8OSCoOscillator Master Clock (CMOS Output). For crystal operation, a 20 MHz 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.
9OSCiOscillator Master Clock (CMOS Input). For crystal operation, a 20 MHz 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 8 kHz 61 ns 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.
12 F0o
Frame Pulse ST-BUS 2.048 Mb/s (CMOS Output). This is an 8 kHz 244 ns active low
framing pulse, which marks the beginning of an ST-BUS frame. This is typically used for ST-
BUS operation at 2.048 Mb/s and 4.096 Mb/s. See Figure 11.
13 RSP Receive Sync Pulse (CMOS Output). This is an 8 kHz 488 ns 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 12.
14 TSP Transmit Sync Pulse (CMOS Output). This is an 8 kHz 488 ns 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 12.
15 F8o Frame Pulse (CMOS Output). This is an 8 kHz 122 ns active high framing pulse, which
marks the beginning of a frame. See Figure 11.
16 C1.5o Clock 1.544 MHz (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 2.048 MHz (CMOS Output). This output is used for ST-BUS operation at 2.048 Mb/s.
20 C4o
Clock 4.096 MHz (CMOS Output). This output is used for ST-BUS operation at 2.048 Mb/s
and 4.096 Mb/s.
21 C19o Clock 19.44 MHz (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 8.192 MHz (CMOS Output). This output is used for ST-BUS operation at 8.192 Mb/s.
26 C16o
Clock 16.384 MHz (CMOS Output). This output is used for ST-BUS operation with a
16.384 MHz 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,
42
IC Internal Connection. Tie low for normal operation.
Pin Description (continued)
Pin # Name Description
