SP505ACF datasheet(33/36 Pages) SIPEX

33 / 36 page

Rev. 7/9/03

SP505 Multi–Mode Serial Transceiver

LOOPBACK MODE...

The SP505 is equipped with two loopback

modes. Single-ended loopback internally

connects V.28 driver outputs to V.28 receiver

inputs. The signal path is non-inverting and will

support data rates up to 120kbps. The propaga-

tion delay times are as specified in the electrical

specifications.

To initiate a single-ended

loopback, the code "1010" should be written to

the driver decoder.

Differential loopback is

implemented by applying "1011" to the driver

decoder. This internally connects V.11 driver

outputs to V.11 receiver inputs. The signal path

again is non-inverting; the differential loopback

data rate can be at least 5Mbps.

Under loopback conditions the receiver decoder

is disabled. While the SP505 is in either single-

ended or differential loopback mode, the driver

outputs are tri-stated and the receiver inputs are

disabled.

Mode

Driver Output

Receiver Input

Driver Receiver

non-inverting

inverting

non-inverting

inverting

Input

Output

Loopback

tri-state

>10KΩ to GND >10KΩ to GND active

active

tri-state

>10KΩ to GND >10KΩ to GND active

active

Power down

clamped

tri-state

>10KΩ to GND >10KΩ to GND inactive at ±0.6V

Tri-state

tri-state

>10KΩ to GND >10KΩ to GND inactive

tri-state

DEC=1010

DEC=1011

CC=VDD=VSS=0V

DEC=0000

MODE: Differential Loopback

DRIVER/RECEIVER

DEC3 DEC2 DEC1 DEC0

RD(a) 70

RxD 1

RT(a) 37

RxC 20

SCT(a) 76

SCT 79

SCTEN 7

SCT(b) 77

15 TxC

63 TT(a)

65 TT(b)

6 TTEN

RECEIVERS

DRIVERS

22 ST

42 ST(a)

44 ST(b)

23 STEN

CS(a) 66

CTS 80

RR(a) 35

DCD 19

RR(b) 36

CS(b) 67

RT(b) 38

RD(b) 71

24 LL

51 LL(a)

49 LL(b)

5 LLEN

14 TxD

61 SD(a)

59 SD(b)

2 SDEN

13 DTR

58 TR(a)

56 TR(b)

3 TREN

16 RTS

54 RS(a)

52 RS(b)

4 RSEN

17 RL

47 RL(a)

45 RL(b)

18 RLEN

IC(a) 39

RI 21

IC(b) 40

DM(a) 68

DSR 78

DM(b) 69

IC(a) 39

RI 21

SCTEN 7

RECEIVERS

DRIVERS

24 LL

51 LL(a)

5 LLEN

13 DTR

58 TR(a)

3 TREN

DM(a) 68

DSR 78

16 RTS

54 RS(a)

4 RSEN

17 RL

47 RL(a)

18 RLEN

RR(a) 35

DCD 19

CS(a) 66

CTS 80

RD(a) 70

RxD 1

RT(a) 37

RxC 20

SCT(a) 76

SCT 79

14 TxD

61 SD(a)

2 SDEN

15 TxC

63 TT(a)

6 TTEN

22 ST

42 ST(a)

23 STEN

MODE: Single-Ended Loopback

DRIVER/RECEIVER

DEC3 DEC2 DEC1 DEC0

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