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ADM485AQ Datasheet(PDF) 3 Page - Analog Devices

Part No. ADM485AQ
Description  5 V Low Power EIA RS-485 Transceiver
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM485AQ Datasheet(HTML) 3 Page - Analog Devices

   
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ADM485
REV. A
–3–
ABSOLUTE MAXIMUM RATINGS*
(TA = +25
°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
Inputs
Driver Input (DI) . . . . . . . . . . . . . . . . –0.3 V to VCC + 0.3 V
Control Inputs (DE, RE) . . . . . . . . . . –0.3 V to VCC + 0.3 V
Receiver Inputs (A, B) . . . . . . . . . . . . . . . . . –14 V to +14 V
Outputs
Driver Outputs . . . . . . . . . . . . . . . . . . . . . . . –14 V to +14 V
Receiver Output . . . . . . . . . . . . . . . . . –0.5 V to VCC +0.5 V
Power Dissipation 8-Pin DIP . . . . . . . . . . . . . . . . . . . 500 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . +130°C/W
Power Dissipation 8-Pin SOIC . . . . . . . . . . . . . . . . . 450 mW
θ
JA, Thermal Impedance
. . . . . . . . . . . . . . . . . .
+170
°C/W
Power Dissipation 8-Pin Cerdip . . . . . . . . . . . . . . . . 500 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . +125°C/W
Operating Temperature Range
Commercial (J Version) . . . . . . . . . . . . . . . . . 0
°C to +70°C
Industrial (A Version) . . . . . . . . . . . . . . . . –40
°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65
°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300
°C
Vapour Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . +215
°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220
°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods may affect device reliability.
Table I. Transmitting
INPUTS
OUTPUT
RE
DE
DI
B
A
X
1101
X
1010
X0
X
Z
Z
Table II. Receiving
INPUTS
OUTPUT
RE
DE
A-B
RO
00
≥ +0.2 V
1
00
≤ –0.2 V
0
0
0
Inputs Open
1
10
X
Z
PIN FUNCTION DESCRIPTION
Pin Mnemonic Function
1
RO
Receiver Output. When enabled if A > B by
200 mV, then RO = High. If A < B by
200 mV, then RO = Low.
2
RE
Receiver Output Enable. A low level enables
the receiver output, RO. A high level places it
in a high impedance state.
3
DE
Driver Output Enable. A high level enables
the driver differential outputs, A and B. A
low level places it in a high impedance state.
4
DI
Driver Input. When the driver is enabled a
logic Low on DI forces A low and B high
while a logic High on DI forces A high and B
low.
5
GND
Ground Connection, 0 V.
6
A
Noninverting Receiver Input A/Driver
Output A.
7
B
Inverting Receiver Input B/Driver Output B.
8VCC
Power Supply, 5 V
± 5%.
PIN CONFIGURATION
RO
RE
DE
DI
GND
A
B
V
CC
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
ADM485
ORDERING GUIDE
Model
Temperature Range
Package Option
ADM485JN
0
°C to +70°C
N-8
ADM485JR
0
°C to +70°C
SO-8
ADM485AN
–40
°C to +85°C
N-8
ADM485AR
–40
°C to +85°C
SO-8
ADM485AQ
–40
°C to +85°C
Q-8
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADM485 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE


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