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SP301

RS-232/RS-422 Line Drivers/Receivers

Signal Processing Technologies 

PIN ASSIGNMENTS

VDD (+12V) 1

RIA2 2

RIA1 3

TOA2 4

TOA1 5

SELECT A 6

SELECT B 7

TOB1 8

TOB2 9

RIB1 10

RIB2 11

GND 12

VDD (+12V) 1

RIA2 2

RIA1 3

N.C. 4

TOA2 5

TOA1 6

SELECT A 7

SELECT B 8

TOB1 9

TOB2 10

N.C. 11

RIB1 12

RIB2 13

GND 14

24 VCC (+5V)

23 N.C.

22 ROA

21 N.C.

20 TIA

19 LB

18 N.C.

17 TIB

16 N.C.

15 ROB

14 N.C.

13 VEE (-12V)

28 VCC (+5V)

27 N.C.

26 ROA

25 N.C.

24 N.C.

23 TIA

22 LB

21 N.C.

20 TIB

19 N.C.

18 N.C.

17 ROB

16 N.C.

15 VEE (-12V)

VDD (+12V) 1

RIA2 2

RIA1 3

TOA2 4

TOA1 5

SELECT A 6

SELECT B 7

TOB1 8

TOB2 9

RIB1 10

RIB2 11

GND 12

VDD (+12V) 1

RIA2 2

RIA1 3

N.C. 4

TOA2 5

TOA1 6

SELECT A 7

SELECT B 8

TOB1 9

TOB2 10

N.C. 11

RIB1 12

RIB2 13

GND 14

24 VCC (+5V)

23 ROA2

22 ROA1

21 TIA2

20 TIA1

19 LB

18 N.C.

17 TIB1

16 TIB2

15 ROB1

14 ROB2

13 VEE (-12V)

28 VCC (+5V)

27 ROA2

26 ROA1

25 N.C.

24 TIA2

23 TIA1

22 LB

21 N.C.

20 TIB1

19 TIB2

18 N.C.

17 ROB1

16 ROB2

15 VEE (-12V)

FEATURES…

The SP301 and SP302 are proprietary single-

chip devices that contain both RS-232 and RS-

422 protocol line drivers and receivers. They

differ only in the total number of line drivers and

receivers of each protocol that may be active at

any given time. Their configuration may be

changed at any time by logic levels on two

control lines. In any configuration, both the

SP301 and SP302 fully meet the requirements

of the EIA RS-232D and RS-422 data commu-

nication standards.

The RS-232 line driver circuits convert TTL

logic level inputs into inverted RS-232 output

signals. The RS-422 line drivers convert TTL

logic levels into RS-422 differential output sig-

nals. The RS-422 line driver outputs feature

high source and sink current capability. All line

drivers are internally protected against short

circuits on their outputs.

The RS-232 receivers convert the EIA RS-232

input signals to inverted TTL output logic levels.

The RS-422 receivers convert the EIA RS-422

differential input signals into non-inverted TTL

output logic levels. Receiver input filtering pro-

vides excellent high frequency noise immunity.

Input pulses with widths less than 1µs are com-

pletely ignored. The RS-232 receivers have the

additional feature of voltage hysteresis, which

helps eliminate spurious output transitions that

might result from low amplitude noise voltages

during slower-speed signal transitions.

A loopback test mode is provided that puts the

driver outputs to a high impedance tri-state

level, and routes the driver outputs to their

associated receiver inputs. In this configuration,

the signal path is non-inverting from the TTL

driver input to the receiver TTL output. This

operating mode allows the controlling system to

perform diagnostic self-test of the RS-232/RS-

422 driver/receiver circuitry at speeds up to

3,000 bits per second.

The SP301 and SP302 are available in 24-pin

single–width (0.300") plastic DIP and 28-pin

54

Corporation

SIGNAL PROCESSING EXCELLENCE

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