Si2456/33/14
®
V.90, V.34, V.32BIS ISOMODEM CHIPSET WITH INTEGRATED GLOBAL DAA
Features
ꢀ Data modem formats
ꢀ Integrated DAA
ꢁ
ꢁ
ꢁ
ꢁ
ITU-T, Bell
ꢁOver 5000 V 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 69.
Applications
ꢀ Set-top boxes
ꢀ E-mail terminals
ꢀ Point-of-sale terminals
ꢀ Digital video recorders
ꢀ Security systems
ꢀ Remote monitoring
Pin Assignments
Si2456/33/14
Description
24
23
22
21
CLKIN/XTALI
EECLK/D5
1
2
3
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-
XTALO
DCD/D4
ESC/D3
CLKOUT/EECS/A0
D6
VD3.3
GND
C1A
4
5
ISOB
VD3.3
GND
20
19
6
7
8
9
VDA
18
17
®
RTS/D7
VDB
wire hybrid. The ISOmodem chipset is ideal for embedded modem
16
15
14
EESD/D2
RI/D1
RXD/RD
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.
10
11
12
TXD/WR
CTS/CS
INT/D0
AOUT/INT
13
RESET
Functional Block Diagram
Si3015
1
2
3
4
QE2
DCT
IGND
C1B
16
15
FILT2
FILT
CLKIN/XTALI
CLKOUT
XTALO
RX
14
13
PLL
Clocking
REXT
REXT2
RAM/ROM
Data Bus
RNG1
RNG2
12
11
5
6
7
RXD
TXD
CTS
RTS
DCD
ESC
RI
REF
QB
QE
10
9
VREG2
VREG
Serial
Interface
8
C1A
DAA
Interface
Microcontroller
DSP
To Phone
Line
INT
Patents pending
AOUT
ISOB
CS
WR
RD
Parallel
Interface
A0
D0-D7
RESET
Rev. 1.2 8/06
Copyright © 2006 by Silicon Laboratories
Si2456/33/14