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SP488 Datasheet, PDF (4/6 Pages) Sipex Corporation – Quad RS-485/RS-422 Line Receivers | |||
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Pin 13 â RO4 â Receiver 4 Output â If
Receiver 4 output is enabled, if RI4A > RI4B by
200mV, Receiver 4 output is high. If Receiver 4
output is enabled, and if RI4A < RI4B by
200mV, Receiver 4 output is low.
Pin 14 â RI A â Receiver 4 input A.
4
Pin 15 â RI4B â Receiver 4 input B.
Pin
16
â
Supply
Voltage
V
CC
â
4.75V
â¤
V
CC
â¤
5.25V.
SP489 PINOUT
Pin 1 â RI1B â Receiver 1 input B.
Pin 2 â RI1A â Receiver 1 input A.
Pin 3 â RO1 â Receiver 1 Output â If Re-
ceiver 1 output is enabled, if RI1A > RI1B by
200mV, Receiver output is high. If Receiver 1
output is enabled, and if RI A< RI B by 200mV,
1
1
Receiver 1 output is low.
Pin 4 â EN1/EN2 â Receiver 1 and 2 Output
Enable. Please refer to SP489 Truth Table (2).
Pin 5 â RO2 â Receiver 2 Output â If Re-
ceiver 2 output is enabled, if RI2A > RI2B by
200mV, Receiver 2 output is high. If Receiver 2
output is enabled, and if RI2A < RI2B by
200mV, Receiver 2 output is low.
Pin 6 â RI2A â Receiver 2 input A.
Pin 7 â RI B â Receiver 2 input B.
2
Pin 8 â GND â Digital Ground.
DIFFERENTIAL
AâB
ENABLES
EN
EN
VID ⥠0.2V
H
X
X
L
â0.2V < VID < +0.2V
H
X
X
L
VID ⤠0.2V
H
X
X
L
X
L
H
Table 1. SP488 Truth Table
OUTPUT
RO
H
H
X
X
L
L
HiâZ
Pin 9 â RI3B â Receiver 3 input B.
Pin 10 â RI3A â Receiver 3 input A.
Pin 11 â RO3 â Receiver 3 Output â If
Receiver 3 output is enabled, if RI3A > RI3B by
200mV, Receiver 3 output is high. If Receiver 3
output is enabled, and if RI3A < RI3B by
200mV, Receiver 3 output is low.
Pin 12 â EN3/EN4 â Receiver 3 and 4 Output
Enable. Please refer to SP489 Truth Table (2).
Pin 13 â RO4 â Receiver 4 Output â If
Receiver 4 output is enabled, if RI4A > RI4B by
200mV, Receiver 4 output is high. If Receiver 4
output is enabled, and if RI4A < RI4B by
200mV, Receiver 4 output is low.
Pin 14 â RI4A â Receiver 4 input A.
Pin 15 â RI B â Receiver 4 input B.
4
Pin 16 â Supply Voltage VCC â 4.75V ⤠VCC â¤
5.25V.
FEATURESâ¦
The SP488 and SP489 are lowâpower quad
differential line receivers meeting RS-485 and
RS-422 standards. The SP488 features active
high and active low common receiver enable
controls; the SP489 provides independent, ac-
tive high receiver enable controls for each pair
of receivers. Both feature triâstate outputs and a
-7V to +12V commonâmode input range per-
mitting a ±7V ground difference between de-
vices on the communications bus. The SP488/
489 are equipped with a failâsafe feature which
forces a logic high at the receiver output when
the input is left floating. Data rates up to 10Mbps
are supported. Both are available in 16-pin
plastic DIP and SOIC packages.
DIFFERENTIAL
AâB
ENABLES
OUTPUT
EN1/EN2 or EN3/EN4
RO
VID ⥠0.2V
H
H
â0.2V < VID < +0.2V
H
X
VID ⤠0.2V
H
L
X
L
HiâZ
Table 2. SP489 Truth Table
SP488/489
Quad RS-485/RS-422 Line Receivers
4
© Copyright 2000 Sipex Corporation
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