SI2456 Datasheet, PDF (1/86 Pages) Silicon Laboratories – V.90, V.34, V.32BIS ISOMODEM™ WITH INTEGRATED GLOBAL DAA

Si2456/Si2433/Si2414
V. 9 0 , V. 3 4 , V. 3 2 B I S I S O M O D E M ™ 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
Email terminals
Point-of-sale terminals
Integrated DAA
Capacitive isolation
Parallel phone detect
Globally-compliant line interface
Overcurrent detection
Fast connect
Parallel interface
Call progress support
Firmware upgradeable
PVRs
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, 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.
Functional Block Diagram
CLKOUT
RXD
TXD
CTS
RTS
DCD
ESC
RI
INT
CS
WR
RD
A0
D0-D7
RESET
CLKIN/XTALI
XTALO
PLL
Clocking
RAM
Serial
Interface
Data Bus
Microcontroller
DSP
DAA
Interface
Parallel
Interface
C1A
To Phone
Line
AOUT
ISOB
Ordering Information
This data sheet is valid only for
those chipset combinations listed
on page 81.
Pin Assignments
Si2456/33/14
CLKIN/XTALI 1
XTALO 2
CLKOUT/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 D5
23 DCD/D4
22 ESC/D3
21 C1A
20 ISOB
19 VD3.3
18 GND
17 VDB
16 ^D2
15 ^RI/D1
14 ^INT/D0
13 ^AOUT/INT
QE2
DCT
IGND
C1B
RNG1
RNG2
QB
QE
Si3015
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
FILT2
FILT
RX
REXT
REXT2
REF
VREG2
VREG
Patents pending
Rev. 0.9 9/02
Copyright © 2002 by Silicon Laboratories
Si2456/Si2433/Si2414-DS09