SI2456-FT Datasheet, PDF (1/74 Pages) Silicon Laboratories – V.90, V.34, V.32BIS ISOMODEM® CHIPSET WITH INTEGRATED GLOBAL DAA

Si2456/33/14
V. 9 0 , V. 3 4 , V. 3 2 B I S I S O M O D E M ^® C H I PS E T W I T H I N T E G R A T E D G L O B A L D A A
Features
Data modem formats
ITU-T, Bell
300 bps up to 56 kbps
V.42, V.42bis, MNP2-5
Automatic rate negotiation
Caller ID decode
3.3 V power
No external ROM or RAM required
UART with flow control
AT command set support
Applications
Set-top boxes
E-mail terminals
Point-of-sale terminals
Integrated DAA
Over 5000 V capacitive isolation
Parallel phone detect
Globally-compliant line interface
Overcurrent detection
Fast connect
Parallel interface
Call progress support
Firmware upgradeable
Digital video recorders
Security systems
Remote monitoring
Description
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, codec, isolation transformer, relays, opto-isolators, and 2- to 4-
wire hybrid. The ISOmodem^® chipset 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.
Functional Block Diagram
CLKIN/XTALI
XTALO
CLKOUT
RXD
TXD
CTS
RTS
DCD
ESC
RI
INT
PLL
Clocking
Serial
Interface
RAM/ROM
Data Bus
Microcontroller
DSP
CS
WR
RD
A0
D0-D7
RESET
Parallel
Interface
DAA
Interface
C1A
To Phone
Line
AOUT
ISOB
Ordering Information
This data sheet is valid only for
those chipset combinations listed
on page 69.
Pin Assignments
Si2456/33/14
CLKIN/XTALI 1
XTALO 2
CLKOUT/EECS/A0 3
D6 ₄
VD3.3 5
GND 6
VDA 7
RTS/D7 8
RXD/RD ⁹
TXD/WR 10
CTS/CS 11
RESET 12
24 EECLK/D5
23 DCD/D4
22 ESC/D3
21 C1A
20 ISOB
19 VD3.3
18 GND
17 VDB
16 EESD/D2
15 RI/D1
14 INT/D0
13 AOUT/INT
Si3015
QE2 1
DCT 2
IGND 3
C1B 4
RNG1 ₅
RNG2 ₆
QB 7
QE ₈
16 FILT2
15 FILT
14 RX
13 REXT
12 REXT2
11 _REF
10 VREG2
9 _VREG
Patents pending
Rev. 1.2 8/06
Copyright © 2006 by Silicon Laboratories
Si2456/33/14