SP488E Sipex, SP488E Datasheet - Page 4

• Manufacturer Part Number: SP488E
• Description: Enhanced Quad RS-485/RS-422 Line Receivers
• Manufacturer: Sipex

SP488E/489EDS/07
Pin 13 — RO
Receiver 4 output is enabled, if RI
200mV, Receiver 4 output is high. If Receiver 4
output is enabled, and if RI
200mV, Receiver 4 output is low.
Pin 14 — RI
Pin 15 — RI
Pin 16 — Supply Voltage V
5.25V.
SP489E PINOUT
Pin 1 — RI
Pin 2 — RI
Pin 3 — RO
Receiver 1 output is enabled, if RI
200mV, Receiver output is high. If Receiver 1
output is enabled, and if RI
Receiver 1 output is low.
Pin 4 — EN1/EN2 — Receiver 1 and 2 Output
Enable. Please refer to SP489E Truth Table (2).
Pin 5 — RO
Receiver 2 output is enabled, if RI
200mV, Receiver 2 output is high. If Receiver 2
output is enabled, and if RI
200mV, Receiver 2 output is low.
Pin 6 — RI
Pin 7 — RI
Pin 8 — GND — Digital Ground.
Table 1. SP488E Truth Table
–0.2V < V
DIFFERENTIAL
V
V
ID
ID
A – B
X
ID
0.2V
0.2V
< +0.2V
1
1
2
2
B — Receiver 1 input B.
A — Receiver 1 input A.
A — Receiver 2 input A.
B — Receiver 2 input B.
1
4
4
A — Receiver 4 input A.
B — Receiver 4 input B.
—
2
4
— Receiver 2 Output — If
— Receiver 4 Output — If
EN
H
X
H
X
H
X
L
Receiver 1 Output — If
ENABLES
SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers
1
A < RI
CC
— 4.75V V
4
2
EN
A < RI
A < RI
X
X
X
H
L
L
L
1
4
B by 200mV,
2
1A
A > RI
A > RI
> RI
OUTPUT
4
2
B by
B by
Hi–Z
RO
1
4
2
H
H
X
X
B by
L
L
B by
B by
CC
4
Pin 9 — RI
Pin 10 — RI
Pin 11 — RO
Receiver 3 output is enabled, if RI
200mV, Receiver 3 output is high. If Receiver 3
output is enabled, and if RI
200mV, Receiver 3 output is low.
Pin 12 — EN3/EN4 — Receiver 3 and 4 Output
Enable. Please refer to SP489E Truth Table (2).
Pin 13 — RO
Receiver 4 output is enabled, if RI
200mV, Receiver 4 output is high. If Receiver 4
output is enabled, and if RI
200mV, Receiver 4 output is low.
Pin 14 — RI
Pin 15 — RI
Pin 16 — Supply Voltage V
5.25V.
FEATURES…
The SP488E and SP489E are low–power quad
differential line receivers meeting RS-485 and
RS-422 standards. The SP488E features active
high and active low common receiver enable
controls; the SP489E provides independent,
active high receiver enable controls for each
pair of receivers. Both feature tri–state outputs
and a -7V to +12V common–mode input range
permitting a +7V ground difference between
devices on the communications bus. The
SP488E/489E are equipped with a fail–safe
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.
Table 2. SP489E Truth Table
–0.2V < V
DIFFERENTIAL
V
V
ID
ID
A – B
X
ID
0.2V
0.2V
< +0.2V
3
B — Receiver 3 input B.
3
4
4
A — Receiver 3 input A.
A — Receiver 4 input A.
B — Receiver 4 input B.
3
4
— Receiver 3 Output — If
— Receiver 4 Output — If
EN
1
/EN
ENABLES
© Copyright 2000 Sipex Corporation
2
or EN
H
H
H
L
CC
— 4.75V V
3
4
3
A < RI
A < RI
/EN
3
4
A > RI
A > RI
4
OUTPUT
Hi–Z
3
4
RO
B by
B by
H
X
L
3
4
B by
B by
CC