ADM223 Просмотр технического описания (PDF) - Analog Devices

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ADM223

+5V Powered CMOS RS-232 Drivers/Receivers

Analog Devices 

ADM223/ADM230L–ADM241L

Mnemonic

VCC

V+

V–

GND

C+

C–

C1+

C1–

C2+

C2–

TIN

TOUT

RIN

ROUT

EN/EN

SD/SD

NC

PIN FUNCTION DESCRIPTION

Function

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.

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.

(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.

(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.

(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.

Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400 kΩ pull-up resistor to VCC is

connected on 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 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.

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.

No Connect. No connections are required to this pin.

Table I. ADM235L, ADM236L, ADM241L Truth Table

SD EN Status

Transmitters Receivers

T1–T5

R1–R5

00

01

10

Normal Operation Enabled

Normal Operation Enabled

Shutdown

Disabled

Enabled

Disabled

Disabled

Table II. ADM223 Truth Table

SD EN Status

Transmitters Receivers

T1–T4

R1–R3 R4, R5

0 0 Shutdown

Disabled

0 1 Shutdown

Disabled

1 0 Normal Operation Enabled

1 1 Normal Operation Enabled

Disabled Disabled

Disabled Enabled

Disabled Disabled

Enabled Enabled

–10–

REV. 0

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