SP508E Datasheet, PDF (19/29 Pages) Exar Corporation – Rugged 20Mbps, 8 Channel Multi-Protocol Transceiver with Programmable DCE/DTE and Termination Resistors

VCC pins (1, 26, 45, 64, 71, 77, 80, 84, 88, 93, 98)
GND pins (2, 25, 44, 52, 68, 74, 82, 86, 91, 96)
N.C. pins (24 and 76)
+5V (decoupling capacitor not shown)
1µF
1µF
72
69 70
67
1µF
VCC
C1+
C1-
C2+
C2-
73 _VDD
Regulated Charge Pump
VSS ⁶⁶
1µF
V35RGND
46
RD(a)
48
28
97
RxD
RDEN
36
11
99
100
RD(b)
47
3
RT(a)
50
29
92
RxC
RTEN
37
12
94
95
RT(b)
49
4
TxC(a)
53
30
87
TxC
TxCEN
38
13
89
90
TxC(b)
51
5
CS(a)
55
31
83
CTS
CSEN
39
14
85
CS(b)
54
6
DM(a)
57
32
75
DSR
DMEN
40
15
78
DM(b)
56
7
RRT(a)
60
33
81
DCD_DTE
RRTEN
41
16
79
RRT(b)
59
8
IC
61
34
42
RI
ICEN
17
65
9
TM(a)
62
35
TM
TMEN
43
18
19 _D0
20 _D1
21 _D2
23 _D-LATCH
22 _TERM-OFF
27 _LOOPBACK
SP508E
GND
63
10
58
V.10-GND
TxD
SD(a)
V35TGND1
SD(b)
SDEN
TxCE
TT(a)
V35TGND2
TT(b)
TTEN
ST
ST(a)
V35TGND3
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
RECEIVER TERMINATION NETWORK
V.35 MODE
V.11 MODE
RX ENABLE
51ohms
124ohms
51ohms
V.35 DRIVER TERMINATION NETWORK
V.35 MODE
TX ENABLE
51ohms
124ohms
51ohms
Figure 45. Functional Diagram
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.comSP508E_100_072412
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