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Part Name
Description
CX20442 View Datasheet(PDF) - Conexant Systems
Part Name
Description
Manufacturer
CX20442
V.92/V.34/V.32bis Modem in 128-Pin TQFP with CX20493 SmartDAA® and Optional CX20442 Voice Codec
Conexant Systems
CX20442 Datasheet PDF : 94 Pages
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CX81801-7x/8x SmartV.XX Modem Data Sheet
Table 3-3. CX81801 Modem 128-Pin TQFP Pin Signals for Serial Interface (PARIF = Low)
Pin
Signal Label
1 RI# (PC5)
2 VDD
3 TM# (PC6)
4 RESERVED (PC7)
5 PARIF
6 DTRIND# (PD0)
7 PD1
8 PD2
9 STPMODE# (PD3)
10 GND
11 DTR# (PD4)
12 RESERVED (PD5)
13 RTS# (PD6)
14 OHIND# (PE0)
15 VDD
16 VOICE# (PE1)
17 RESERVED (PE2)
18 NVMDATA (PE3)
19 HS_LCS (PE4)
20 VDD_CORE
21 RESERVED (PE5)
22 SSD_RING# (PE6)
23 LINE_SEL (PE7)
24 RESERVED (PA0)
25 GND
26 SSD_INT (PA1)
27 TXD# (PA2)
28 RESERVED (PA3)
29 RESERVED (PA4)
30 GND
31 RESERVED (PA5)
32 RXD# (PA6)
33 NVMCLK (PA7)
34 RESET#
35 SR3OUT
36 SR3IN (P_PX01)
37 M_CLK (P_PB00)
38 SA2CLK (P_PX05)
39 SR2IO (P_PX06)
40 VDD
41 P_PX00
42 P_PX02
43 P_PX03
44 GND
45 SR4IN
46 PD7
I/O
O
P
O
I
I
O
I/O
I/O
I
G
I
I
I
O
P
O
O
I/O
I
P
I/O
O
I
O
G
O
I
I
I
G
I
O
O
I
O
I
O
I
O
P
I/O
I/O
I/O
G
I
I/O
I/O Type
Ith/Ot8
PWR
Ith/Ot8
Ith/Ot8
Itpu
Ithpd/Ot2
Ithpd/Ot2
Ithpd/Ot2
Ith/Ot2
GND
It
Ithpu
Ithpu
It/Ot8
PWR
It/Ot2
It/Ot2
It/Ot2
Interface
DTE IF: RI#
+3.3V
DTE IF: TM#
+3.3V through 47 K
Ω
GND (serial interface)
LED: DTRIND#
NC
NC
NC
GND
DTE IF: DTR#
NC
DTE IF: RTS#
LED: OHIND#
+3.3V
DAA: VOICE#
NC
NVRAM: SDA
It/Ot2
PWR
It/Ot2
It/Ot2
It/Ot8
It/Ot2
GND
It/Ot2
It/Ot2
Itpu/Ot2
Itpu/Ot2
GND through 47 K
Ω
Internal core voltage
+3.3V through 47 K
Ω
NC
+3.3V through 47 K
Ω
NC
GND
NC
DTE IF: TXD#
NC
NC
GND
GND
It/Ot2
It/Ot2
+3.3V through 47 K
Ω
DTE IF: RXD#
It/Ot2
NVRAM: SCL
It
Ot2
Itk/Ot2
It/Ot2
Itpu/Ot2
It/Ot2
PWR
It/Ot8
Itpu/Ot2
Itpu/Ot2
GND
Itk
It/Ot2
Reset Circuit
VC: M_TXSIN
VC: M_RXOUT
VC: M_CLKIN
VC: M_STROBE
VC: M_CNTRLSIN
+3.3V
NC
NC
NC
GND
NC
NC
Pin
Signal Label
65 D3
66 D4
67 D5
68 GND
69 D6
70 D7
71 A0
72 A1
73 A2
74 A3
75 A4
76 A5
77 A6
78 VDD
79 A7
80 A8
81 A9
82 PLLVDD
83 PLLGND
84 A10
85 VDD_CORE
86 A11
87 A12
88 A13
89 A14
90 GND
91 A15
92 SR2CLK (P_PGP05)
93 DIB_DATAP
94 DIB_DATAN
95 GND
96 PWRCLKP
97 PWRCLKN
98 DSPKOUT
99 A16 (PB0)
100 VDD
101 RESERVED (PB1)
102 ROMSEL# (PB2)
103 GND
104 RAMSEL# (PB3)
105 A17 (PB4)
106 A18 (PB5)
107 EXT_RES# (PB6)
108 VDD
109 TMIND# (PB7)
110 TESTP
I/O
I/O
I/O
I/O
G
I/O
I/O
O
O
O
O
O
O
O
P
O
O
O
P
G
O
P
O
O
O
O
G
O
I
I/O
I/O
G
O
O
O
O
P
O
O
G
O
O
O
O
P
O
I
I/O Type
Ith/Ot2
Ith/Ot2
Ith/Ot2
GND
Ith/Ot2
Ith/Ot2
It/Ot8
It/Ot8
It/Ot8
It/Ot8
It/Ot8
It/Ot8
It/Ot8
PWR
It/Ot8
It/Ot8
It/Ot8
PWR
GND
It/Ot8
PWR
It/Ot8
It/Ot8
It/Ot8
It/Ot8
GND
It/Ot8
Itpu/Ot2
Idd/Odd
Idd/Odd
GND
Odpc
Odpc
It/Ot2
It/Ot2
PWR
It/Ot2
Ot2
GND
It/Ot2
It/Ot2
It/Ot2
It/Ot2
PWR
It/Ot8
Itpu
Interface
EB: D3
EB: D4
EB: D5
GND
EB: D6
EB: D7
EB: A0
EB: A1
EB: A2
EB: A3
EB: A4
EB: A5
EB: A6
+3.3V
EB: A7
EB: A8
EB: A9
+3.3V and GND
through 0.1
µ
F
GND
EB: A10
Internal core voltage
EB: A11
EB: A12
EB: A13
EB: A14
GND
EB: A15
VC: M_SCK
DIB: Data Pos.
Channel
DIB: Data Neg.
Channel
GND
DIB: Transformer
primary winding non-
dotted terminal
DIB: Transformer
primary winding dotted
terminal
Speaker Circuit
EB: A16
+3.3V
NC
EB: ROM CE#
GND
EB: RAM CS#
EB: A17
EB: A18
NC
+3.3V
LED: TMIND#
NC
3-14
Conexant
102199B
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