SP504 datasheet(19/31 Pages) SIPEX

19 / 31 page

Rev: A Date:1/27/04

SP504 Multi–Mode Serial Transceivers

Figure 18. Typical Operation Circuit

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

IC(b) 40

SCT(a) 76

SCT 79

SCTEN 7

SCT(b) 77

14 TxD

61 SD(a)

59 SD(b)

22 ST

42 ST(a)

44 ST(b)

23 STEN

15 TxC

63 TT(a)

65 TT(b)

TTEN

13 DTR

58 TR(a)

56 TR(b)

16 RTS

54 RS(a)

52 RS(b)

17 RL

47 RL(a)

45 RL(b)

24 LL

51 LL(a)

49 LL(b)

22µF

1N5819

VCC

VDD

C1-

C2-

VSS

C1+

C2+

+5V

10µF

22µF

External

Latch

RS-422 Mode

Input Word

Charge Pump

A — Receiver Tri-State circuitry & V.35

termination resistor circuitry for

RxD, RxC & SCT.

B — Driver Tri-State circuitry & V.35

termination circuitry for TxD,

TxC & ST.

SP504

(SEE PAGE 12 FOR GROUND PINS)

① ☛ For V.35 Termination, needs to be connected

for proper V.35 operation.

A low on-

resistance (≤1Ω) FET or switch can be used

to connect and disconnect the resistor from

the non-inverting output.

150Ω

①

150Ω

①

150Ω

①

22µF

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