SP487 SIPEX [Sipex Corporation], SP487 Datasheet - Page 4

• Manufacturer Part Number: SP487
• Description: Quad RS-485/RS-422 Line Drivers
• Manufacturer: SIPEX [Sipex Corporation]

SP486/487
PINOUT — SP487
Pin 16 — Supply Voltage V
5.25V.
SP487 PINOUT
Pin 1 — DI
enabled, logic 0 on DI
and DO
enabled forces driver DO
Pin 2 — DO
Pin 3 — DO
Pin 4 — EN
Please refer to SP487 Truth Table (2).
Pin 5 — DO
Pin 6 — DO
Pin 7 — DI
enabled, logic 0 on DI
and DO
enabled forces driver DO
Pin 8 — GND — Digital Ground.
Pin 9 — DI
enabled, logic 0 on DI
and DO
enabled forces driver DO
Pin 10 — DO
EN
DO
DO
1
DO
DO
GND
/EN
1
2
3
DI
DI
1
1
2
2
B high. A logic 1 on DI
B high. A logic 1 on DI
B high. A logic 1 on DI
A
B
B
A
1
2
2
1
2
3
1
2
3
4
5
6
7
8
— Driver 1 Input — If Driver 1 output is
— Driver 2 Input — If Driver 2 output is
— Driver 3 Input — If Driver 3 output is
1
1
1
2
2
/EN
A — Driver 1 output A.
B — Driver 1 output B.
B — Driver 2 output B.
A — Driver 2 output A.
3
A — Driver 3 output A.
2
1
2
— Driver 1 and 2 Output Enable.
1
2
3
forces driver output DO
forces driver output DO
forces driver output DO
1
2
3
A high and DO
A high and DO
A high and DO
CC
SP487
1
2
3
with Driver 1 output
with Driver 2 output
with Driver 3 output
— 4.75V
3
4
16
15
14
13
12
11
10
9
1
2
3
B low.
B low.
B low.
V
DI
DO
DO
EN
DO
DO
DI
CC
4
3
3
4
4
3
3
Quad RS-485/RS-422 Line Drivers
/EN
1
2
3
A
B
B
A
V
A low
A low
A low
4
CC
4
Table 1. SP486 Truth Table
Pin 11 — DO
Pin 12 — EN
Please refer to SP487 Truth Table (2).
Pin 13 — DO
Pin 14 — DO
Pin 15 — DI
is enabled, logic 0 on DI
low and DO
output enabled forces driver DO
low.
Pin 16 — Supply Voltage V
5.25V.
FEATURES…
The SP486 and SP487 are low–power quad differ-
ential line drivers meeting RS-485 and RS-422
standards. The SP486 features active high and
active low common driver enable controls; the
SP487 provides independent, active high driver
enable controls for each pair of drivers. The driver
outputs are short–circuit limited to 200mA. Data
rates up to 10Mbps are supported. Both are avail-
able in 16–pin plastic DIP and SOIC packages.
Table 2. SP487 Truth Table
INPUT
INPUT
DI
DI
H
H
X
L
L
H
X
L
EN1/EN2 or EN3/EN4
EN
4
4
H
H
X
X
L
B high. A logic 1 on DI
3
ENABLES
— Driver 4 Input — If Driver 4 output
3
/EN
4
4
B — Driver 3 output B.
B — Driver 4 output B.
A — Driver 4 output A.
ENABLES
4
— Driver 3 and 4 Output Enable.
H
H
L
EN
H
X
X
L
L
4
© Copyright 2000 Sipex Corporation
forces driver output DO
CC
OUTA
Hi–Z
4
— 4.75V
A high and DO
H
H
L
L
OUTA
OUTPUTS
Hi–Z
4
H
L
OUTPUTS
with Driver 3
OUTB
Hi–Z
OUTB
Hi–Z
V
H
H
L
L
H
L
CC
4
4
A
B