73M2901CL
V.22bis Single Chip Modem
DIGITAL INTERFACE PIN DESCRIPTION
PIN
NAME
RESET
RXCLK
TXCLK
TXD
RXD
USR10
32 pin
PLCC
13
31
28
27
30
12
32 pin
TQFP
9
27
24
23
26
8
44 pin LQFP
9
36
31
30
35
8
TYPE
I
O
O
I
O
I/O
DESCRIPTION
Reset
Receive data synchronous clock
Transmit data synchronous clock
Serial data input from DTE
Serial output to DTE
Programmable I/O port. This pin optionally be
used to control an external switch for external Line
In Use circuitry.
Programmable I/O port. This pin can optionally be
used to control an external switch for caller ID
operation.
Request to send
Clear to send
Data set ready
Data carrier detect
Ring indicator
Relay driver output
Programmable I/O port
USR11
576
&76
'65
'&'
5,
5(/$<
USR20
11
10
9
8
7
4
3
1
7
6
5
4
3
32
31
29
7
6
5
4
3
43
40
38
I/O
I
O
O
O
O
O
I/O
EXTERNAL INTERRUPTS PIN DESCRIPTION
PIN
NAME
5,1*
'75
32 pin
PLCC
2
32
32 pin
TQFP
30
28
44 pin LQFP
39
37
TYPE
I
I
DESCRIPTION
External interrupt – Line interface ring detection
circuitry input
External interrupt – DTE DTR signal input
OSCILLATOR PIN DESCRIPTION
PIN
NAME
OSCIN
OSCOUT
32 pin
PLCC
24
23
32 pin
TQFP
19
18
44 pin LQFP
26
25
TYPE
I
O
DESCRIPTION
Crystal input for internal oscillator, also input for
external source
Crystal oscillator output
4
TDK [ TDK ELECTRONICS ]
