DS_2901CE_031
73M2901CE Data Sheet
3 Pin Descriptions
3.1 Power Pins
Pin Name
VPA
Pin Number
10
Type
Description
I
I
I
I
Positive analog voltage (analog supply)
VNA
16
Negative analog voltage (analog ground)
Positive digital voltage (digital supply)
Negative digital voltage (digital ground)
VPD
2, 20, 25
1, 17, 22
VND
3.2 Analog Interface Pins
Pin Name
RXA
Pin Number
Type
Description
15
11
12
14
I
Receive analog input
Transmit analog - output
Transmit analog + output
TXAN
TXAP
VBG
O
O
O
Analog Band Gap voltage reference (0.1 µF to VNA). This pin
must not be connected to external circuitry other than the
decoupling capacitor.
VREF
13
O
Analog reference voltage (0.1 µF to VNA)
3.3 Digital Interface Pins
Pin Name
RESET
RXCLK
TXCLK
TXD
Pin Number
Type
Description
9
I
O
O
I
Reset
27
24
23
26
8
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
RXD
O
I/O
USR10
Programmable I/O port. This pin can optionally be used to
control an external switch for external Line In Use circuitry.
USR11
7
I/O
Programmable I/O port. This pin can optionally be used to
control an external switch for caller ID operation.
RTS
6
5
I
O
Request to send
Clear to send
CTS
DSR
DCD
RI
4
O
Data set ready
3
O
Data carrier detect
Ring indicator
32
31
29
O
RELAY
USR20
O
Relay driver output
Programmable I/O port
I/O
Rev. 3.3
7