si2493 Silicon Laboratories, si2493 Datasheet - Page 46

• Manufacturer Part Number: si2493
• Description: V.92 Isomodem With Global Daa
• Manufacturer: Silicon Laboratories

Si2493
7. Pin Descriptions: Si2493 (16-Pin Option)
46
Pin #
10
11
1
2
3
4
5
6
7
8
9
CLKIN/XTALI XTALI—Crystal Oscillator Pin.
MISO/RXD
MOSI/TXD
SCLK/CTS
Pin Name
RESET
XTALO
C2A
C1A
INT
V
RI
D
Provides support for parallel resonant AT cut crystals. A 4.9152 MHz or 32.768 kHz crystal
or a 32.768 kHz or 4.9152 or 27 MHz clock on XTALI is required.
XTALO—Crystal Oscillator Pin.
Serves as the output of the crystal amplifier.
Ring Indicator.
The RI on (active low) indicates the presence of an ON segment of a ring signal on the tele-
phone line.
Supply Voltage.
Provides the 3.3 V supply voltage to the Si2493.
Master In Slave Out/Receive Data.
Serial data output from modem in SPI mode.
Data output to DTE RXD pin in UART mode.
Master Out Slave In/Transmit Data.
Serial data input to modem in SPI mode.
Data input from DTE TXD pin in UART mode.
Serial Data Clock/Clear to Send.
Signals that the Si2493 is ready to receive more digital data on the TXD pin.
Serial data clock input in SPI mode.
Reset Input.
An active low input that is used to reset all control registers to a defined, initialized
state.
Isolation Capacitor 2A.
Connects to one side of the isolation capacitor C2.
Isolation Capacitor 1A.
Connects to one side of the isolation capacitor C1.
Interrupt Output.
Active low interrupt output.
CLKIN/XTALI
MISO/RXD
SCLK/CTS
MOSI/TXD
RESET
XTALO
V
RI
D
(16-Pin Option)
1
2
5
8
3
4
6
7
Rev. 1.3
Si2493
Description
16
15
13
12
10
14
11
9
SS/RTS
DCD
ESC
GND
INT
C1A
C2A
V
A