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ADM209ARS Datasheet(PDF) 7 Page - Analog Devices

Part No. ADM209ARS
Description  0.1 uF, 5 V Powered CMOS RS-232 Drivers/Receivers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM205–ADM211/ADM213
REV. 0
–7–
PIN FUNCTION DESCRIPTION
Mnemonic
Function
VCC
Power Supply Input 5 V
± 10% (+5 V ± 5% ADM205).
V+
Internally generated positive supply (+10 V nominal) on all parts except ADM209.
ADM209 requires external 9 V to 13.2 V supply.
V–
Internally generated negative supply (–10 V nominal).
GND
Ground pin. Must be connected to 0 V.
C+
(ADM209 only) External capacitor (+ terminal) is connected to this pin.
C–
(ADM209 only) External capacitor (– terminal) is connected to this pin.
C1+
(ADM206, ADM207, ADM208, ADM211, ADM213) External capacitor (+ terminal) is connected to this pin.
C1–
(ADM206, ADM207, ADM208, ADM211, ADM213) External capacitor (– terminal) is connected to this pin.
C2+
(ADM206, ADM207, ADM208, ADM211, ADM213) External capacitor (+ terminal) is connected to this pin.
C2–
(ADM206, ADM207, ADM208, ADM211, ADM213) External capacitor (– terminal) is connected to this pin.
TIN
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 k
Ω pull-up resistor to Vcc is
connected on each input.
TOUT
Transmitter (Driver) Outputs. These are RS-232 levels (typically
±10 V).
RIN
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 k
Ω pull-down resistor to GND is con-
nected on each input.
ROUT
Receiver Outputs. These are TTL/CMOS levels.
EN
/EN
Enable Input. Active low on ADM205, ADM206, ADM209, ADM211. Active high on ADM213. This input is
used to enable/disable the receiver outputs. With EN = Low (EN = High ADM213), the receiver outputs are en-
abled. With EN =High (EN = low ADM213), the outputs are placed in a high impedance state. This facility is
useful for connecting to microprocessor systems.
SD/SD
Shutdown Input. Active high on ADM205, ADM206, ADM211. Active low on ADM213. With SD = high on the
ADM205, ADM206, ADM211, the charge pump is disabled, the receiver outputs are placed in a high impedance
state and the driver outputs are turned off. With SD low on the ADM213, the charge pump is disabled, the driver
outputs are turned off and all receivers except R4 and R5 are placed in a high impedance state. In shutdown, the
power consumption reduces to 5
µW.
NC
No Connect. No connections are required to this pin.
Table II. ADM205, ADM206, ADM211 Truth Table
SD
EN
Status
Transmitters T1–T5
Receivers R1–R5
0
0
Normal Operation
Enabled
Enabled
0
1
Normal Operation
Enabled
Disabled
1
0
Shutdown
Disabled
Disabled
Table III. ADM213 Truth Table
SD
EN
Status
Transmitters T1-T4
Receivers R1-R3
Receivers R4, R5
0
0
Shutdown
Disabled
Disabled
Disabled
0
1
Shutdown
Disabled
Disabled
Enabled
1
0
Normal Operation
Enabled
Disabled
Disabled
1
1
Normal Operation
Enabled
Enabled
Enabled




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