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ADM237L Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte ADM237L
Spiegazioni elettronici  5 V Powered CMOS RS-232 Drivers/Receivers
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM223/ADM230L–ADM241L
–10–
REV. 0
PIN FUNCTION DESCRIPTION
Mnemonic
Function
VCC
Power Supply Input 5 V
± 10% (+5 V ± 5% ADM233L, ADM235L).
V+
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
Ground pin. Must be connected to 0 V.
C+
(ADM231L and ADM239L only). External capacitor (+ terminal) is connected to this pin.
C–
(ADM231L and ADM239L only). External capacitor (– terminal) is connected to this pin.
C1+
(ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor (+ terminal)
is connected to this pin.
(ADM233L) The capacitor is connected internally and no external connection to this pin is required.
C1–
(ADM230L, ADM232L, ADM234L, ADM236L, ADM237L, ADM238L, ADM241L) External capacitor (– terminal)
is connected to this pin.
(ADM233L) The capacitor is connected internally and no external connection to this pin is required.
C2+
(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.
C2–
(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.
TIN
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 k
Ω pull-up resistor to V
CC 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 connected on
each input.
ROUT
Receiver Outputs. These are TTL/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. This 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. ADM235L, ADM236L, ADM241L Truth Table
Transmitters
Receivers
SD
EN
Status
T1–T5
R1–R5
0
0
Normal Operation
Enabled
Enabled
0
1
Normal Operation
Enabled
Disabled
1
0
Shutdown
Disabled
Disabled
Table II. ADM223 Truth Table
Transmitters
Receivers
SD EN Status
T1–T4
R1–R3
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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