ADM231L–ADM234L/ADM236L–ADM241L
Table 4. Pin Function Descriptions
Mnemonic
V
CC
V+
V−
GND
C+
C−
C1+
C1−
C2+
C2−
T
IN
T
OUT
R
IN
R
OUT
EN
SD
NC
Function
Power Supply Input. 5 V ± 10% (5 V ± 5% for ADM233L).
Internally Generated Positive Supply (+10 V nominal) on all parts, except ADM231L and ADM239L. ADM231L and ADM239L
require an external 7.5 V to 13.2 V supply.
Internally Generated Negative Supply (−10 V nominal).
Ground Pin. Must be connected to 0 V.
(ADM231L and ADM239L only) External capacitor (+ terminal) is connected to this pin.
(ADM231L and ADM239L only) External capacitor (– terminal) is connected to this pin.
(ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, and ADM241L) External capacitor (+ terminal) is connected to this
pin. (ADM233L) The capacitor is connected internally and no external connection to this pin is required.
(ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, and ADM241L) External capacitor (− terminal) is connected to this
pin. (ADM233L) The capacitor is connected internally and no external connection to this pin is required.
(ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, and ADM241L) External capacitor (+ terminal) is connected to this
pin. (ADM233L) Internal capacitor connections, Pin 11 and Pin 15, must be connected together.
(ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, and ADM241L) External capacitor (− terminal) is connected to this
pin. (ADM233L) Internal capacitor connections, Pin 10 and Pin 16, must be connected together.
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 kΩ pull-up resistor to V
CC
is connected to
each input.
Transmitter (Driver) Outputs. These are RS-232 levels (typically ±10 V).
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is connected on each input.
Receiver Outputs. These are TTL/CMOS levels.
Enable Input. Active low on ADM236L, ADM239L, and ADM241L. This input is used to enable/disable the receiver outputs.
With EN = low, the receiver outputs are enabled. With EN = high, the outputs are placed in a high impedance state. This
facility is useful for connecting to microprocessor systems.
Shutdown Input. Active high on ADM236L and ADM241L. With SD = high on the ADM236L and ADM241L, the charge pump
is disabled, the receiver outputs are placed in a high impedance state, and the driver outputs are turned off.
No Connect. No connections are required to this pin.
Table 5. ADM236L and ADM241L Truth Table
SD
0
0
1
EN
0
1
0
Status
Normal Operation
Normal Operation
Shutdown
Transmitters T1 to T5
Enabled
Enabled
Disabled
Receivers R1 to R5
Enabled
Disabled
Disabled
Rev. C | Page 7 of 20
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