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| 型号： | ADM238LAN |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX QUAD RS-232 5VLP 24DIP |
| 标准包装： | 15 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 4/4 |
| 规程： | RS232 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 24-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 24-PDIP |
| 包装： | 管件 |
ADM231L–ADM234L/ADM236L–ADM241L
Rev. C | Page 7 of 20
Table 4. Pin Function Descriptions
Mnemonic
Function
VCC
Power Supply Input. 5 V ± 10% (5 V ± 5% for ADM233L).
V+
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.
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+
(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.
C1
(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.
C2+
(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.
C2
(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.
TIN
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 k pull-up resistor to VCC is connected to
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 pull-down resistor to GND is connected on each input.
ROUT
Receiver Outputs. These are TTL/CMOS levels.
EN
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.
SD
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.
NC
No Connect. No connections are required to this pin.
Table 5. ADM236L and ADM241L Truth Table
SD
EN
Status
Transmitters T1 to T5
Receivers R1 to R5
0
Normal Operation
Enabled
0
1
Normal Operation
Enabled
Disabled
1
0
Shutdown
Disabled
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