Datasheet

DS481
SNLS131B –JULY 2000–REVISED MARCH 2013 www.ti.com
Table 1. Pin Descriptions
Pin Name Number DESCRIPTION
Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI
RO 1 ≥ DO
(1)
/RI
(1)
by 200 mV, RO will be HIGH. If DO/RI ≤ DO
(1)
/RI
(1)
by 200 mV, RO will be
LOW. Additionally RO will be HIGH for OPEN (Non-terminated) Inputs.
Receiver Output Enable: When RE
(1)
is LOW the receiver output is enabled. When RE
(1)
is
RE
(1)
2 HIGH, the receiver output is in TRI-STATE (OFF). When RE
(1)
is HIGH and DE is LOW, the
device will enter a low-current sleep mode after 600 ns.
Driver Output Enable: When DE is HIGH, the driver outputs are enabled. When DE is LOW,
DE 3 the driver outputs are in TRI-STATE (OFF). When RE
(1)
is HIGH and DE is LOW, the device
will enter a low-current sleep mode after 600 ns.
Driver Input: When DE (Driver Enable) is HIGH, the driver is enabled, if DI is LOW, then
DI 4 DO/RI will be LOW and DO
(1)
/RI
(1)
will be HIGH. If DI is HIGH, then DO/RI is HIGH and
DO
(1)
/RI
(1)
is LOW.
GND 5 Ground Connection.
DO/RI 6 Driver Output/Receiver Input, 485 Bus Pin.
DO
(1)
7 Driver Output/Receiver Input, 485 Bus Pin.
/RI
(1)
Positive Power Supply Connection: Recommended operating range for V
CC
is +4.75V to
V
CC
8
+5.25V.
(1) Non Terminated, Open Input only
Truth Table
DRIVER SECTION
RE
(1)
DE DI A B
X
(2)
H H H L
X
(2)
H L L H
X
(2)
L X
(2)
Z
(2)
Z
(2) (3)
RECEIVER SECTION
RE
(1)
DE A-B RO
L L ≥+0.2V H
L L ≤−0.2V L
H X
(2)
X
(2)
Z
(2)(3)
L L OPEN
(1)
H
(1) Non Terminated, Open Input only
(2) X = indeterminate
Z = TRI-STATE
(3) Device enters sleep mode if enable conditions are held > 600 ns, DE = L and RE = H. RE is Non Terminated and Open Input only.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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