ADM223/ADM230L–ADM241L
P IN FUNCTIO N D ESCRIP TIO N
Mnem onic
Function
VCC
V+
Power Supply Input 5 V ± 10% (+5 V ± 5% ADM233L, ADM235L).
Internally generated positive supply (+10 V nominal) on all parts except ADM231L and ADM239L.
ADM231L, ADM239L requires external 7.5 V to 13.2 V supply.
V–
Internally generated negative supply (–10 V nominal).
GND
C+
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.
C–
C1+
(ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor (+ terminal)
is connected to this pin.
(ADM233L) T he capacitor is connected internally and no external connection to this pin is required.
C1–
C2+
C2–
TIN
(ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor (– terminal)
is connected to this pin.
(ADM233L) T he capacitor is connected internally and no external connection to this pin is required.
(ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor (+ terminal)
is connected to this pin.
(ADM233L) Internal capacitor connections, Pins 11 and 15 must be connected together.
(ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor (– terminal)
is connected to this pin.
(ADM233L) Internal capacitor connections, Pins 10 and 16 must be connected together.
T ransmitter (Driver) Inputs. T hese inputs accept T T L/CMOS levels. An internal 400 kΩ pull-up resistor to VCC is
connected on each input.
T OUT
RIN
T ransmitter (Driver) Outputs. T hese 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.
ROUT
Receiver Outputs. T hese are T T L/CMOS levels.
EN/EN
Enable Input. Active low on ADM235L, ADM236L, ADM239L, ADM241L. Active high ADM223. This input is used
to enable/disable the receiver outputs. With EN = low (EN = high ADM223), the receiver outputs are enabled. With
EN = high (EN = low ADM223), the outputs are placed in a high impedance state. T his facility is useful for
connecting to microprocessor systems.
SD/SD
Shutdown Input. Active high on ADM235L, ADM236L, ADM241L. Active low on ADM223. With SD = high on the
ADM235L, ADM236L, ADM241L, 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 ADM223, 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 I. AD M235L, AD M236L, AD M241L Truth Table
Table II. AD M223 Truth Table
Transm itters Receivers
Transm itters
T1–T5
Receivers
R1–R5
SD EN
Status
SD EN Status
T1–T4
R1–R3 R4, R5
0
0
1
0
1
0
Normal Operation
Normal Operation
Shutdown
Enabled
Enabled
Disabled
Enabled
Disabled
Disabled
0
0
1
1
0
1
0
1
Shutdown
Shutdown
Normal Operation Enabled
Normal Operation Enabled
Disabled
Disabled
Disabled Disabled
Disabled Enabled
Disabled Disabled
Enabled Enabled
REV. 0
–10–
ADI [ ADI ]
