SP502 datasheet(17/32 Pages) SIPEX

17 / 32 page

Rev. 7/21/03

SP502 Multi-Mode Serial Transceiver

Figure 10. Mode Diagram — RS-449

RD(a) 70

RxD 1

RD(b) 71

RT(a) 37

RxC 20

RT(b) 38

CS(a) 66

CTS 80

CS(b) 67

DM(a) 68

DSR 78

DM (b) 69

RR(a) 35

DCD 19

RR(b) 36

IC(a) 39

RI 21

ST/TT

RxT*

Enabled

Disabled

Active

Disabled

Enabled

Inactive

* TT driver must be disabled to allow TT(a) and TT(b)

to serve as receiver inputs.

* When the RxT receiver is active, TT(a) and TT(b) act

as receiver inputs. When the RxT receiver is inactive,

it cannot serve as a receiver since its inputs are internally

connected to the TT(a) and TT(b) driver outputs.

14 TxD

61 SD(a)

59 SD(b)

15 TxC

42 ST(a)

44 ST(b)

ST/TT

63 TT(a)

65 TT(b)

13 DTR

58 TR(a)

56 TR(b)

16 RTS

54 RS(a)

52 RS(b)

17 RL

47 RL(a)

24 LL

51 LL(a)

RxT 79

MODE: RS-449

DRIVER

RECEIVER

TDEC3 TDEC2 TDEC1 TDEC0 RDEC3 RDEC2 RDEC1 RDEC0

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