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ADM222AN-ADM222AR-ADM232AAN-ADM232AARN-ADM232AARW-ADM242AN-ADM242AR
High Speed, +5 V, 0.1 uF CMOS RS-232 Drivers/Receivers
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703REV.0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
High Speed, +5 V, 0.1 μF
CMOS RS-232 Drivers/Receivers
FEATURES
200 kB/s Transmission Rate
Small (0.1μF) Charge Pump Capacitors
Single 5 V Power Supply
Meets All EIA-232-E and V.28 Specifications
Two Drivers and Two Receivers
On-Board DC-DC Converters±9 V Output Swing with +5 V Supply
±30 V Receiver Input Levels
Pin Compatible with MAX222/MAX232A/MAX242
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
ORDERING GUIDE
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTIONThe ADM222, ADM232A, ADM242 are a family of high speed
RS-232 line drivers/receivers offering transmission rates up to
200 kB/s. Operating from a single +5 V power supply, a highly
efficienton-chipchargepumpusingsmall(0.1μF)external
capacitorsallowsRS-232 bipolar levels to be developed. Two
RS-232 drivers and two RS-232 receivers are provided on each
device.
The devices are fabricated on BiCMOS, an advanced mixed
technology process which combines low power CMOS with high
speed bipolar circuitry. This allows for transmission rates up to
200 kB/s yet minimizes the quiescent power supply current to
under 5 mA.
The ADM232A is a pin-compatible, high speed upgrade for the
AD232 and for the ADM232L. It is available in 16-pin DIP and
in both narrow and wide surface mount (SOIC) packages.
The ADM222containsanadditionalshutdown(SHDN) func-
tion which may be used to disable the device thereby reducing
the supply current to 0.1 μA. During shutdown, all transmit/
receive functions are disabled. The ADM222 is availablein
18-pinDIPandinawidesurfacemount(SOIC) package.
The ADM242 combines both shutdown (SHDN) and enable
(EN) functions. The shutdown function reduces the supply
curent to 0.1 mA. During shutdown, the transmitters are
disabled but the receivers continue to operate normally. The
enable function allows the receiver outputs to be disabled
thereby facilitating sharing a common bus. The ADM242 is
available in 18-pin DIP and in a wide surface mount (SOIC)
package.
*. Patent No. 5,237,209.
REV. 0–2–
Specifications subject to change without notice.
ADM222/ADM232A/ADM242–SPECIFICATIONS
(VCC= +5 V ± 10%, C1–C4 = 0.1 μF; all spec-
ifications TMIN to TMAX unless otherwise noted.)
REV. 0–3–
ABSOLUTE MAXIMUM RATINGS*
(TA = +25˚C unless otherwise noted)VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(VCC – 0.3 V) to +13 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+0.3 V to –13 V
Input Voltages
TIN . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to (VCC + 0.3 V)
RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±30 V
Output Voltages
TOUT . . . . . . . . . . . . . . . . . . . .(V+, +0.3 V) to (V–, –0.3 V)
ROUT . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to (VCC + 0.3 V)
Short Circuit Duration
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Continuous
Power Dissipation N-16 . . . . . . . . . . . . . . . . . . . . . . .400 mW
(Derate 7.5 mW/°C above +70°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . .80°C/W
Power Dissipation R-16N . . . . . . . . . . . . . . . . . . . . .400 mW
(Derate 7 mW/°C above +70°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . .80°C/W
Power Dissipation R-16W . . . . . . . . . . . . . . . . . . . . .400 mW
(Derate 7 mW/°C above +70°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . .80°C/W
Power Dissipation N-18 . . . . . . . . . . . . . . . . . . . . . . .400 mW
(Derate 7 mW/°C above +70°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . .80°C/W
Power Dissipation R-18W . . . . . . . . . . . . . . . . . . . . .400 mW
(Derate 7 mW/°C above +70°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . . .80°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . .–40°C to +85°C
Storage Temperature Range . . . . . . . . . . . .–65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . .+300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
*This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation sections of this specifica-
tion is not implied. Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
Test CircuitsFigure 1.Transmitter Propagation Delay Timing
VOUTtPLHT
+3V
VINFigure 3.Receiver Propagation Delay Timing
Figure4. Receiver Disable TimingFigure 2. Receiver Enable Timing
+0.8V
+3V
tER
+3.5V
RECEIVER
OUTPUT
INPUT
GND
VCC
50%
VIN
VOUTtPHLR
+3V
ADM222/ADM232A/ADM242REV. 0–4–
PIN FUNCTION DESCRIPTIONFigure 8.ADM222 DIP & SOIC Pin ConfigurationsFigure 7.ADM222 Typical Operating Circuit
Figure 5.Shutdown Test Circuit
tDT
+ 5V
TRANSMITTER
OUTPUT
SHDN
INPUT
– 5V
0V
3VFigure 6.Transmitter Shutdown Disable Timing
VINVOUT
50pF3kΩ
ON EACH TTL/MOS INPUT
** INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
0.1µF
0.1µF
0.1µF
TTL/CMOS
OUTPUTS
R1OUT
R2OUT
T1OUT
T2OUT
R1IN
R2IN
T1IN
T2IN
TTL/CMOS
INPUTS*
RS-232
OUTPUTS
RS-232
INPUTS**
0.1µF
SHDN
REV. 0–5–
Figure 9.ADM232A DIP/SOIC Pin ConfigurationFigure 11.ADM242 DIP/SOIC Pin Configuration
Figure 12.ADM242 Typical Operating CircuitFigure 10.ADM232A Typical Operating Circuit
T2OUT
C1+
SHDN
VCC
C2+
C2–
R1OUT
T1IN
C1–
GND
T2IN
R2INR2OUT
R1IN
T1OUT
C1+
VCC
GND
C2–
T2OUT
R1OUT
T1IN
T2IN
C1–
C2+
T1OUT
R1IN
R2INR2OUT
TTL/CMOS
OUTPUTS
0.1µF
0.1µF
0.1µF
R1OUT
R2OUT
T1OUT
T2OUT
R1IN
R2IN
T1IN
T2IN
TTL/CMOS
INPUTS*
RS-232
OUTPUTS
RS-232
INPUTS**
0.1µF
ON EACH TTL/MOS INPUT
** INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
REV. 0–6–
ADM222/ADM232A/ADM242–Typical Performance CharacteristicsFigure 16.Transmitter Output Voltage vs. CurrentFigure 13.Charge Pump V+, V– vs. Current
Figure 14.Transmitter Baud Rate vs. Load CapacitanceFigure 17.Charge Pump V+, V– Exiting Shutdown
Figure 18.Transmitter Fully Loaded Slew RateFigure 15.Transmitter Unloaded Slew Rate
LOAD CAPACITANCE – pF
TRANSMITTER OUTPUT VOLTAGE – V155 I+, ( | I– | ) – mA
V+, ( |
) – V
