MAX3130CAI ,3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 InterfaceELECTRICAL CHARACTERISTICS(V = AV = 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), T = T ..
MAX3130EAI ,3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 InterfaceFeaturesThe MAX3130/MAX3131 combine an IrDA 1.2 compati-' Integrated RS-232 and IrDA in Single 28-P ..
MAX313CPE ,10з, Quad, SPST, CMOS Analog SwitchesGeneral Description ________
MAX313CPE+ ,10Ω, Quad, SPST, CMOS Analog SwitchesApplicationsPART TEMP RANGE PIN-PACKAGETest Equipment MAX312CPE 0°C to +70°C 16 Plastic DIPCommunic ..
MAX313CSE ,10з, Quad, SPST, CMOS Analog SwitchesApplicationsPART TEMP. RANGE PIN-PACKAGETest Equipment MAX312CPE 0°C to +70°C 16 Plastic DIPCommuni ..
MAX313CSE ,10з, Quad, SPST, CMOS Analog SwitchesGeneral Description ________
MAX6370KA+T ,Pin-Selectable Watchdog Timersapplications:● Industrial Controllers● Watchdog startup delay: provides an initial delay ● Critical ..
MAX6370KA-T ,Pin-Selectable Watchdog Timersapplications:• Watchdog startup delay: provides an initial delaybefore the watchdog timer is starte ..
MAX6371KA+ ,Pin-Selectable Watchdog TimersApplicationstimers that supervise microprocessor (μP) activity and ● Pin-Selectable Watchdog Timeou ..
MAX6371KA+T ,Pin-Selectable Watchdog TimersFeaturesThe MAX6369–MAX6374 are pin-selectable watchdog ● Precision Watchdog Timer for Critical μP
MAX6372KA-T ,Pin-Selectable Watchdog TimersELECTRICAL CHARACTERISTICS(V = +2.5V to +5.5V, SET_ = V or GND, T = -40°C to +85°C, unless otherwis ..
MAX6373KA+T ,Pin-Selectable Watchdog TimersApplicationsseveral pin-selectable watchdog timing options to match ● Embedded Control Systemsa wid ..
MAX3130CAI-MAX3130EAI
3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface
General DescriptionThe MAX3130/MAX3131 combine an IrDA 1.2 compati-
ble infrared transceiver with an RS-232 interface—all in
a single 3V-powered hybrid microcircuit. The infrared
transceiver supports IrDA data rates of 2.4kbps to
115kbps. The infrared receive channel provides a high-
gain/low-noise PIN-diode amplifier with 100µA of ambi-
ent photodiode current rejection at a +3V supply. A
high-power LED driver capable of sinking 200mA is
included in the infrared transmit path. The on-board
encoder/decoder (ENDEC) compresses/stretches sig-
nals to and from the external UART, allowing IrDA com-
munication even with non-IrDA UARTs.
A 2-driver/2-receiver RS-232 transceiver supports data
rates up to 120kbps. A proprietary, high-efficiency, dual
charge-pump power supply and a low-dropout trans-
mitter combine to deliver true RS-232 performance from
a single +3.0V to +5.5V supply. Selectable shutdown
for IR and RS-232 circuitry reduces supply current to
1µA.
The MAX3130 is optimized for applications using a sin-
gle UART for both infrared and RS-232 communication.
The infrared transmitter input and infrared receiver out-
put are multiplexed with one RS-232 transmitter input
and one RS-232 receiver output, respectively. The
MAX3131’s IrDA transceiver and RS-232 transceivers
are separate and have their own data inputs and outputs.
Both these devices require a minimum of external com-
ponents: four small 0.1µF capacitors, a photodiode, an
infrared LED, and a current-setting resistor.
ApplicationsPersonal Digital Assistants (PDAs)
Palmtop Computers
Battery-Powered Systems
Hand-Held Equipment
Peripherals
IrDA Applications
Cellular Phones
FeaturesIntegrated RS-232 and IrDA in Single 28-Pin SSOP
Package370µA Supply CurrentIrDA 1.2 Compatible: 2.4kbps to 115kbps
Data RateOn-Board IR Encoder/Decoder Allows Use of
Non-IrDA UARTs+3.0V to +5.5V Single-Supply OperationMeet EIA/TIA-232 Specifications Down to +3V200mA, High-Current Infrared LED Drive1µA Low-Power Shutdown with RS-232
Receivers Active
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface19-1402; Rev 0; 11/98
Pin Configuration
Ordering Information
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= AVCC= 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C and VCC= AVCC= 3.3V.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND..............................................................-0.3V to +6V
AVCCto AGND.........................................................-0.3V to +6V
VCCto AVCC.......................................................................±0.3V
AGND, PGND to GND........................................................±0.1V
V+ to GND................................................................-0.3V to +7V
V- to GND.................................................................+0.3V to -7V
V+ to V-................................................................................+13V
Inputs (referenced to GND)
T1IN, T2IN, TXD, RSSD, IRMODE, BAUD16,
IRSD....................................................................-0.3V to +6V
R1IN, R2IN.....................................................................±25V
Outputs (referenced to GND)
T1OUT, T2OUT............................................................±13.2V
R1OUT, R2OUT, EDGEDET, RXD.........-0.3V to (VCC+ 0.3V)
LEDC...................................................................-0.3V to +6V
Output Short-Circuit Duration (to VCCor GND)
T1OUT, T2OUT.....................................................Continuous
Output Currents
LEDC Continuous........................................................200mA
LEDC 20% Duty Cycle tON< 90µs..............................500mA
Input Current
PINC..............................................................................10mA
Continuous Power Dissipation (TA= +70°C)
SSOP (derate 9.52mW/°C above +70°C)...................762mW
Operating Temperature Ranges
MAX3130/MAX3131CAI....................................0°C to +70°C
MAX3130/MAX3131EAI..................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
ELECTRICAL CHARACTERISTICS (continued)(VCC= AVCC= 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C and VCC= AVCC= 3.3V.)
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
Typical Operating Characteristics(VCC= AVCC= 3.3V, GND = AGND = PGND, C1–C4 = 0.1µF, RL= 3kΩ, TA = +25°C, unless otherwise noted.)
Note 1:C1–C4 = 0.1µF, tested at +3.3V ±10%. C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%.
Note 2:All supply current measurements are made under no-load condition on all outputs, and all input voltages are at VCCor GND.
Note 3:For a compliant IrDA input signal where the data rate is within the supported data rate for the IR receive mode: rise/fall
times are less than 600ns and pulse widths are between 1.41µs and 3/16 of the baud rate.
ELECTRICAL CHARACTERISTICS (continued)(VCC= AVCC= 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C and VCC= AVCC= 3.3V.)
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interfaceypical Operating Characteristics (continued)(VCC= AVCC= 3.3V, GND = AGND = PGND, C1–C4 = 0.1µF, RL= 3kΩ, TA = +25°C, unless otherwise noted.)
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
Pin Description
Typical Operating Characteristics (continued)(VCC= AVCC= 3.3V, GND = AGND = PGND, C1–C4 = 0.1µF, RL= 3kΩ, TA = +25°C, unless otherwise noted.)
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
Pin Description (continued)
MAX3130/MAX3131
3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface
Detailed DescriptionThe MAX3130/MAX3131 are IrDA 1.2 compatible,
infrared transceivers with an integrated RS-232 inter-
face. By selecting appropriate external optical compo-
nents, these devices support IrDA 1.2 data rates from
2.4kbps to 115kbps at distances from 1cm to 1m. A
low-noise design allows them to achieve a bit-error rate
below 10-8at maximum data rates. On-chip filtering
rejects out-of-band ambient light signals that interfere
with infrared communication. Both devices include a
high-power LED driver capable of sinking 200mA.
The MAX3130 and MAX3131 contain two RS-232 drivers
and two RS-232 receivers that support data rates up to
120kbps. The RS-232 transceiver is powered by a high-
efficiency, dual charge-pump power supply that oper-
ates with input supply voltages from +3.0V to +5.5V.
The MAX3130 is optimized for applications using a sin-
gle UART for both infrared and RS-232 communication.
The infrared transmitter input and infrared receiver out-
put are multiplexed with one RS-232 transmitter input
and one RS-232 receiver output, respectively. The
MAX3131 IrDA and RS-232 transceivers are indepen-
dent of each other for use in simultaneous multiprotocol
IR ReceiversThe receiver amplifier reverse biases the PIN diode
with approximately 1.2V, and the PIN diode converts
pulses of IR light into pulses of current. The input trans-
impedance (current-to-voltage) amplifier converts and
amplifies these current pulses into voltage pulses. The
MAX3130/MAX3131 incorporate filters that remove low-
frequency ambient light interference and high-frequency
circuit noise from these voltage pulses. A high-speed
comparator then translates these voltage pulses into
CMOS output levels. Figures 1 and 2 show system
functional diagrams.
The RXD pin is the output of the infrared receiver for
the MAX3131. The R2OUT pin is the output of the
infrared receiver for the MAX3130 (IRMODE= low).
With the ENDEC disabled, the infrared receiver output
pulses low upon each incoming infrared pulse. The
pulse width of the receiver output depends on many
factors, including transmitter distance and power, PIN
photodiode efficiency and area, and incoming data
rate. Under all circumstances the output pulse is less
than one baud period. To communicate with UARTs
that are not IrDA compatible, enable the ENDEC (see
the IrDA Encoder/Decoder (ENDEC)section).
MAX3131 Operational Modes Table
MAX3130 Function TableX = Don’t care
