SP488E Datasheet, PDF (4/10 Pages) Sipex Corporation – Enhanced Quad RS-485/RS-422 Line Receivers

Pin 13 — RO₄ — Receiver 4 Output — 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 — RI A — Receiver 4 input A.
4
Pin 15 — RI₄B — Receiver 4 input B.
Pin
16
—
Supply
Voltage
V
CC
—
4.75V
≤
V
CC
≤
5.25V.
SP489E PINOUT
Pin 1 — RI₁B — Receiver 1 input B.
Pin 2 — RI₁A — Receiver 1 input A.
Pin 3 — RO₁ —
Receiver 1 Output — If
Receiver 1 output is enabled, if RI_1A > 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 — EN1/EN2 — Receiver 1 and 2 Output
Enable. Please refer to SP489E Truth Table (2).
Pin 5 — RO₂ — Receiver 2 Output — If
Receiver 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 — RI₂A — Receiver 2 input A.
Pin 7 — RI B — Receiver 2 input B.
2
Pin 8 — GND — Digital Ground.
DIFFERENTIAL
A–B
ENABLES
EN
EN
V_ID ≥ 0.2V
H
X
X
L
–0.2V < V_ID < +0.2V
H
X
X
L
V_ID ≤ 0.2V
H
X
X
L
X
L
H
Table 1. SP488E Truth Table
OUTPUT
RO
H
H
X
X
L
L
Hi–Z
Pin 9 — RI₃B — Receiver 3 input B.
Pin 10 — RI₃A — Receiver 3 input A.
Pin 11 — RO₃ — Receiver 3 Output — 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 — EN3/EN4 — Receiver 3 and 4 Output
Enable. Please refer to SP489E Truth Table (2).
Pin 13 — RO₄ — Receiver 4 Output — 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 — RI₄A — Receiver 4 input A.
Pin 15 — RI B — Receiver 4 input B.
4
Pin 16 — Supply Voltage V_CC — 4.75V ≤ V_CC ≤
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.
DIFFERENTIAL
A–B
ENABLES
OUTPUT
EN₁/EN₂ or EN₃/EN₄
RO
V_ID ≥ 0.2V
H
H
–0.2V < V_ID < +0.2V
H
X
V_ID ≤ 0.2V
H
L
X
L
Hi–Z
Table 2. SP489E Truth Table
SP488E/489EDS/07
SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers
4
© Copyright 2000 Sipex Corporation