Материал: ADM223

Figure 9. ADM234L DIP/SOIC Pin Configuration

Figure 10. ADM234L Typical Operating Circuit

* INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.

** INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.

Figure 11. ADM235L DIP Pin Configuration

Figure 12. ADM235L Typical Operating Circuit

–6–

REV. B

Figure 13. ADM236L DIP/SOIC Pin Configuration

Figure 14. ADM236L Typical Operating Circuit

Figure 15. ADM237L DIP/SOIC Pin Configuration

Figure 16. ADM237L Typical Operating Circuit

REV. B

–7–

* INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.

** INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.

Figure 17. ADM238L DIP/SOIC Pin Configuration

Figure 18. ADM238L Typical Operating Circuit

* INTERNAL 400k PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.

** INTERNAL 5k PULL-DOWN RESISTOR ON EACH RS-232 INPUT.

Figure 19. ADM239L DIP/SOIC Pin Configuration

Figure 20. ADM239L Typical Operating Circuit

–8–

REV. B

REV. B

–9–

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 kΩ 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 kΩ 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.

–10–

REV. B