SP3508EB Datasheet, PDF (24/36 Pages) Sipex Corporation – Evaluation Board Manual

(See pinout assignments for
GND and V_CC pins)
CVDD
+3.3V (decoupling capacitor not shown)
C1
C2
1mF
1mF
1mF
+3.3V
VCC
76 _VDD
74
C1+
70
C1-
72
C2+
Regulated Charge Pump
69
24
C2- C3+
C3- 26
VSS1 ⁶⁸
29 AVCC
Inverter
VSS2 ²⁷
RD(a)
RD(b)
RT(a)
RxD
RDEN
RT(b)
TxC(a)
RxC
RTEN
TxC(b)
TxC
TxCEN
CS(a)
CS(b)
DM(a)
CTS
CSEN
DM(b)
RRT(a)
DSR
DMEN
DCD_DTE
RRTEN
RRT(b)
IC
RI
ICEN
TM(a)
TM
TMEN
RECEIVER TERMINATION NETWORK
V.35 MODE
V.11 MODE
RX ENABLE
51ohms
124ohms
51ohms
50
39
10
49
52
40
11
51
55
41
12
53
57
42
13
56
59
43
14
58
62
44
15
61
63
45
16
64
46
17
18
D0
19
D1
20
D2
21
D-LATCH
22
TERM-OFF
30
LOOPBACK
SP3508
GND
31
97
99
2
32
93
95
3
33
89
91
4
34
81
83
5
35
85
87
6
36
79
77
7
37
67
8
38
65
9
60
V.10-GND
AGND
28
1mF C3
1mF C_VSS1
C_VSS2
1mF
TxD
SD(a)
SD(b)
SDEN
TxCE
TT(a)
TT(b)
TTEN
ST
ST(a)
ST(b)
STEN
RTS
RS(a)
RS(b)
RSEN
DTR
TR(a)
TR(b)
TREN
DCD_DCE
RRC(a)
RRC(b)
RRCEN
RL
RL(a)
RLEN
LL
LL(a)
LLEN
V.35 DRIVER TERMINATION NETWORK
V.35 MODE
TX ENABLE
51ohms
124ohms
51ohms
Figure 44. Functional Diagram
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • www.exar.com

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SP3508_100_072208