9

ExarCorporation48720KatoRoad,FremontCA,94538•50-668-707•www.exar.comSP508E_00_07242

Figure45.FunctionalDiagram

TxD

SD(a)

V35TGND1

SD(b)

SDEN

VCC

VDD

C1-

VSS

C1+

1µF

Regulated Charge Pump

SP508E

TxCE

TT(a)

V35TGND2

TT(b)

TTEN

ST

ST(a)

V35TGND3

ST(b)

STEN

RD(a)

RxD

RDEN

RD(b)

RT(a)

RxC

RTEN

RT(b)

TxC(a)

TxC

TxCEN

TxC(b)

CS(a)

CTS

CSEN

CS(b)

DM(a)

DSR

DMEN

DM(b)

RRT(a)

DCD_DTE

RRTEN

RRT(b)

TM(a)

TM

TMEN

RTS

RS(a)

RS(b)

RSEN

DTR

TR(a)

TR(b)

TREN

DCD_DCE

RRC(a)

RRC(b)

RRCEN

LL

LL(a)

LLEN

C2-

C2+

GND

D0

D1

D2

TERM-OFF

D-LATCH

V.10-GND

V.35 MODE

TX ENABLE

51ohms

51ohms

124ohms

V.35 DRIVER TERMINATION NETWORK

V.35 MODE

RX ENABLE

51ohms

51ohms

124ohms

RECEIVER TERMINATION NETWORK

V.11 MODE

RL

RL(a)

RLEN

IC

RI

ICEN

V35RGND

LOOPBACK

72

69

70

67

66

73

46

48

36

11

47

50

37

12

49

53

38

13

51

55

39

14

54

57

40

15

56

60

41

16

59

61

42

17

62

43

18

19

20

21

23

22

27

28

97

99

100

3

29

92

94

95

4

30

87

89

90

5

31

83

85

6

32

75

78

7

33

81

79

8

34

65

9

35

63

10

58

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)

1µF

1µF

1µF