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ADM232A
High Speed, +5V, 0.1 礔 CMOS RS-232 Transceiver with 2 Drivers, 2 Receivers, 200kBPS Data Rate and a Shutdown Pin
REV.A
High-Speed, 5 V, 0.1 �F
CMOS RS-232 Drivers/Receivers
FEATURES
200 kB/s Transmission Rate
Small (0.1 �F) 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
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
efficient on-chip charge pump using small (0.1 µF) external
capacitors allows RS-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 that 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-lead DIP
and in both narrow and wide surface-mount (SOIC) packages.
The ADM222 contains an additional shutdown (SHDN) func-
tion that may be used to disable the device, thereby reducing the
supply current to 0.1 µA. During shutdown, all transmit/receive
*. Patent No. 5,237,209.
functions are disabled. The ADM222 is available in 18-lead
DIP and in a wide surface-mount (SOIC) package.
The ADM242 combines both shutdown (SHDN) and enable
(EN) functions. The shutdown function reduces the supply
current to 0.1 mA. During shutdown, the transmitters are dis-
abled 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-lead DIP and in a wide surface-mount (SOIC)
package.
ADM222/ADM232A/ADM242–SPECIFICATIONS
(VCC = 5 V � 10%. C1–C4 = 0.1 �F; all spec-
ifications TMIN to TMAX unless otherwise noted.)*Guaranteed by design, not production tested.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*(TA = 25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . (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°CW
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.
ORDERING GUIDE
Test CircuitsFigure 1.Transmitter Propagation Delay Timing
Figure 2.Receiver Enable Timing
Figure 3.Receiver Propagation Delay Timing
Figure 4.Receiver Disable Timing
ADM222/ADM232A/ADM242Figure 5.Shutdown Test Circuit
Figure 6.Transmitter Shutdown Disable Timing
Figure 7.ADM222 Typical Operating Circuit
PIN FUNCTION DESCRIPTIONFigure 8.ADM222 DIP and SOIC Pin Configurations
Figure 9.ADM232A DIP/SOIC Pin Configuration
Figure 10.ADM232A Typical Operating Circuit
Figure 11.ADM242 DIP/SOIC Pin Configuration
Figure 12.ADM242 Typical Operating Circuit
ADM222/ADM232A/ADM242
–Typical Performance CharacteristicsTPC 1. Charge Pump V+, V– vs. Current
TPC 2. Transmitter Baud Rate vs. Load Capacitance
TPC 3.Transmitter Unloaded Slew Rate
TPC 4. Transmitter Output Voltage vs. Current
TPC 5. Charge Pump V+, V– Exiting Shutdown
TPC 6.Transmitter Fully Loaded Slew Rate
