Datasheet

DS36C278
SNLS096C –JULY 1998–REVISED APRIL 2013 www.ti.com
Pin Descriptions
Pin No. Name Description
1 RO Receiver Output: When RE (Receiver Enable) is LOW, the receiver is enabled (ON), if DO/RI ≥ DO*/RI* by 200 mV, RO
will be HIGH. If DO/RI ≤ DO*/RI* by 200 mV, RO will be LOW. Additionally RO will be HIGH for OPEN (Non-terminated)
Inputs.
2 RE* Receiver Output Enable: When RE* is LOW the receiver output is enabled. When RE* is HIGH, the receiver output is in
TRI-STATE (OFF).
3 DE Driver Output Enable: When DE is HIGH, the driver outputs are enabled. When DE is LOW, the driver outputs are in
TRI-STATE (OFF).
4 DI Driver Input: When DE (Driver Enable) is HIGH, the driver is enabled, if DI is LOW, then DO/RI will be LOW and
DO*/RI* will be HIGH. If DI is HIGH, then DO/RI is HIGH and DO*/RI* is LOW.
5 GND Ground Connection.
6 DO/RI Driver Output/Receiver Input, 485 Bus Pin.
7 DO*/RI* Driver Output/Receiver Input, 485 Bus Pin.
8 V
CC
Positive Power Supply Connection: Recommended operating range for V
CC
is +4.75V to +5.25V.
Table 1. Truth Table
(1)
DRIVER SECTION
RE* DE DI DO/RI DO*/RI*
X H H H L
X H L L H
X L X Z Z
RECEIVER SECTION
RE* DE RI-RI* RO
L L ≥+0.2V H
L L ≤−0.2V L
H L X Z
L L OPEN
(1)
H
(1) Non-terminated, 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.
Absolute Maximum Ratings
(1)(2)
Supply Voltage (V
CC
) +12V
Input Voltage (DE, RE*, & DI) −0.5V to (V
CC
+0.5V)
Common Mode (V
CM
)
Driver Output/Receiver Input ±15V
Input Voltage (DO/RI, DO*/RI*) ±14V
Receiver Output Voltage −0.5V to (V
CC
+0.5V)
Maximum Package Power Dissipation
@ +25°C
D0008A Package 1190 mW, derate 9.5 mW/°C above +25°C
P0008E Package 744 mW, derate 6.0 mW/°C above +25°C
Storage Temperature Range −65°C to +150°C
Lead Temperature
(Soldering 4 sec) +260°C
(1) “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to
imply that the devices should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device
operation.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.
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