Si2456/Si2433/Si2414
V.90, V.34, V.32BIS ISOMODEM™ WITH INTEGRATED GLOBAL DAA
Features
ꢀ Data modem formats
ꢀ Integrated DAA
ꢁ
ꢁ
ꢁ
ꢁ
ITU-T, Bell
ꢁCapacitive isolation
300 bps up to 56 kbps
V.42, V.42bis, MNP2-5
Automatic rate negotiation
ꢁParallel phone detect
ꢁGlobally-compliant line interface
ꢁOvercurrent detection
ꢀ Caller ID decode
ꢀ 3.3 V power
ꢀ No external ROM or RAM required
ꢀ UART with flow control
ꢀ AT command set support
ꢀ Fast connect
ꢀ Parallel interface
ꢀ Call progress support
ꢀ Firmware upgradeable
Ordering Information
This data sheet is valid only for
those chipset combinations listed
on page 81.
Applications
ꢀ Set-top boxes
ꢀ PVRs
ꢀ Email terminals
ꢀ Point-of-sale terminals
ꢀ Security systems
ꢀ Remote monitoring
Pin Assignments
Si2456/33/14
Description
1
CLKIN/XTALI
XTALO
CLKOUT/A0
D6
24
23
22
21
20
19
18
17
16
15
14
13
D5
2
3
4
DCD/D4
ESC/D3
C1A
The Si2456 is a complete, ITU-V.90-compliant, 56 kbps modem chipset
with integrated direct access arrangement (DAA) that provides a
programmable line interface to meet global telephone line requirements
with a single design. Available in two small packages, it eliminates the
need for a separate DSP data pump, external RAM and ROM, modem
controller, analog front end (AFE), isolation transformer, relays, opto-
isolators, and 2- to 4-wire hybrid. The ISOmodem™ is ideal for embedded
modem applications due to its small board space, low power
consumption, and global compliance. The Si2433 and Si2414 products
offer all the same features as the Si2456 with connect rates of up to
33.6 kbps and 14.4 kbps, respectively.
VD3.3
ISOB
5
GND
VDA
VD3.3
GND
6
7
RTS/D7
RXD/RD
TXD/WR
CTS/CS
RESET
VDB
D2
RI/D1
INT/D0
AOUT/INT
8
9
10
11
12
Functional Block Diagram
Si3015
QE2
DCT
IGND
C1B
RNG1
RNG2
QB
FILT2
FILT
RX
REXT
REXT2
REF
VREG2
VREG
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLKIN/XTALI
XTALO
PLL
CLKOUT
Clocking
RAM
Data Bus
RXD
TXD
CTS
RTS
DCD
ESC
RI
Serial
Interface
QE
C1A
DAA
Microcontroller
DSP
To Phone
Line
Interface
INT
Patents pending
AOUT
ISOB
CS
WR
Parallel
RD
Interface
A0
D0-D7
RESET
Rev. 0.9 9/02
Copyright © 2002 by Silicon Laboratories
Si2456/Si2433/Si2414-DS09