73m2901ce Maxim Integrated Products, Inc., 73m2901ce Datasheet - Page 7

• Manufacturer Part Number: 73m2901ce
• Description: V.22bis Single Chip Modem
• Manufacturer: Maxim Integrated Products, Inc.

DS_2901CE_031
3 Pin Descriptions
3.1
3.2
3.3
Rev. 3.4
Pin Name
VPA
VNA
VPD
VND
Pin Name
RXA
TXAN
TXAP
VBG
VREF
Pin Name
RESET
RXCLK
TXCLK
TXD
RXD
USR10
USR11
RTS
CTS
DSR
DCD
RI
RELAY
USR20
Power Pins
Analog Interface Pins
Digital Interface Pins
Pin Number
Pin Number
Pin Number
2, 20, 25
1, 17, 22
10
16
15
11
12
14
13
27
24
23
26
32
31
29
9
8
7
6
5
4
3
Type
Type
Type
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
Description
Positive analog voltage (analog supply)
Negative analog voltage (analog ground)
Positive digital voltage (digital supply)
Negative digital voltage (digital ground)
Description
Receive analog input
Transmit analog - output
Transmit analog + output
Analog Band Gap voltage reference (0.1 µF to VNA). This pin
must not be connected to external circuitry other than the
decoupling capacitor.
Analog reference voltage (0.1 µF to VNA)
Description
Reset
Receive data synchronous clock, valid on rising edge
Transmit data synchronous clock, valid on rising edge
Serial data input from DTE
Serial output to DTE
Programmable I/O port. This pin can 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
73M2901CE Data Sheet
7