si2493 Silicon Laboratories, si2493 Datasheet - Page 48

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

Si2493
8. Pin Descriptions: Si2493 (24-Pin Option)
48
Pin #
5, 21
6, 20
7,19
1
2
3
4
8
CLKOUT/EECS/
CLKIN/XTALI
SS/RTS/D7
FSYNC/D6
VDA, VDB
Pin Name
XTALO
VD3.3
GND
A0
Clock Input/Crystal Oscillator Pin.
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.
Crystal Oscillator Pin.
Serves as the output of the crystal amplifier.
Clock Output/EEPROM Chip Select/Address Bit 0.
Clock output in serial mode. Active low read/write enable for SPI EEPROM in
serial mode when pin 4 is pulled low during powerup. Address Enable in parallel
mode.
Frame Sync/Data Bit.
Frame Sync output to codec in serial mode. Bidirectional parallel bus data bit 6 in
parallel mode.
Digital Supply Voltage.
Provides the 3.3 V supply voltage to the Si2493.
Ground.
Connects to the system digital ground.
Regulator Voltage Reference.
Connects to an external capacitor and serves as the reference for the internal
voltage regulator.
SPI Slave Select/Request to Send/Data Bit.
Active low slave select in SPI mode.
Active low request to send input used for flow control in UART mode. Bidirec-
tional parallel bus data bit 7 in parallel mode.
CLKOUT/EECS/A0
MISO/RXD/RD
MOSI/TXD/WR
SCLK/CTS/CS
CLKIN/XTALI
SS/RTS/D7
FSYNC/D6
RESET
XTALO
VD3.3
GND
VDA
(24-Pin Option)
1
10
11
12
2
3
4
5
6
7
8
9
Rev. 1.3
Si2493
24
23
22
20
19
18
17
16
15
14
13
21
ESC/D3
GND
INT/DO
SDO/EECLK/D5
DCD/D4
VD3.3
VDB
SDI/EESD/D2
RI/D1
C1A
C2A
AOUT/INT
Description