Maxim MAX3131EAI, MAX3131CAI, MAX3130EAI, MAX3130CAI Datasheet

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General Description

The MAX3130/MAX3131 combine an IrDA 1.2 compati­ble 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 high­gain/low-noise PIN-diode amplifier with 100µA of ambi­ent 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 sig­nals to and from the external UART, allowing IrDA com­munication 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 trans­mitter 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 sin­gle UART for both infrared and RS-232 communication.
The infrared transmitter input and infrared receiver out­put 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 com­ponents: four small 0.1µF capacitors, a photodiode, an
infrared LED, and a current-setting resistor.

Applications

Personal Digital Assistants (PDAs)
Palmtop Computers
Battery-Powered Systems
Hand-Held Equipment
Peripherals
IrDA Applications
Cellular Phones

Features

♦ Integrated RS-232 and IrDA in Single 28-Pin SSOP

Package

♦ 370µA Supply Current
♦ IrDA 1.2 Compatible: 2.4kbps to 115kbps

Data Rate

♦ On-Board IR Encoder/Decoder Allows Use of

Non-IrDA UARTs

♦ +3.0V to +5.5V Single-Supply Operation
♦ Meet EIA/TIA-232 Specifications Down to +3V
♦ 200mA, High-Current Infrared LED Drive
♦ 1µA Low-Power Shutdown with RS-232

Receivers Active

MAX3130/MAX3131

3V to 5.5V, IrDA Infrared Transceiver with

Integrated RS-232 Interface

________________________________________________________________

Maxim Integrated Products

1

28
27
26
25
24
23
22
21
20
19
18
17
16
15

1
2
3
4
5
6
7
8

9
10
11
12
13
14

R2OUT
R2IN
T2OUT
RSSD
V­C2-

IRSD

C2+
C1­C1+
V+
N.C.
LEDC
PGND

PINC

AGND

AV

CC

N.C.

V

CC

GND

BAUD16

T1OUT

R1IN

R1OUT

IRMODE (TXD)

T2IN

T1IN

EDGEDET (RXD)

SSOP

TOP VIEW

MAX3130
MAX3131

( ) ARE FOR MAX3131

19-1402; Rev 0; 11/98

PART

MAX3130CAI

MAX3130EAI
MAX3131CAI

0°C to +70°C

-40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SSOP
28 SSOP
28 SSOP

Pin Configuration

Ordering Information

MAX3131EAI -40°C to +85°C 28 SSOP

µA

MAX3130/MAX3131

3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= AVCC= 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at T

A

= +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

AV

CC

to AGND.........................................................-0.3V to +6V

V

CC

to 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 (V

CC

+ 0.3V)

LEDC...................................................................-0.3V to +6V

Output Short-Circuit Duration (to V

CC

or GND)

T1OUT, T2OUT.....................................................Continuous

Output Currents

LEDC Continuous........................................................200mA

LEDC 20% Duty Cycle t

ON

< 90µs..............................500mA

Input Current

PINC..............................................................................10mA

Continuous Power Dissipation (T

A

= +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

±0.01 ±1.0

2.4

120 200

Output Voltage Low I

SINK

= 1.6mA

0.25 1.0

0.1 0.4 V

Output Voltage High I

SOURCE

= 1.0mA

VCC-VCC-

0.6 0.05

V

2.0

0.8

1.0 10

0.01 1.0

MIN TYP MAX

Data Rate (Note 3)

µAVIN= 0 to V

CC

Input Leakage Current

2.4 115.2

VCC= AVCC= 5V

kbps

Equivalent Input Noise Current 10 nA

RMS

Input Current Sensitivity (Note 3) 0.0002 6 mA
Ambient Photodiode Current

Rejection

AVCC= 3.3V 100
AVCC= 5V 375

µA

V

VCC= AVCC= 3.3V

Input Logic Threshold High

VInput Logic Threshold Low

µATA= +25°C (Note 2)Analog Power-Supply Current

mAVCC= 3.3V or 5V, TA= +25°C (Note 2)Power-Supply Current

RSSD = low or IRMODE = low,
T

A

= +25°C (Note 2)

Shutdown Supply Current µA

µA

IRSD = low, TA= +25°C (Note 2)

Shutdown Analog Supply Current

UNITSCONDITIONSPARAMETER

LOGIC INPUTS (T1IN, T2IN, TXD, IRMODE, BAUD16, IRSD, RSSD)

DC CHARACTERISTICS

LOGIC OUTPUTS (R1OUT, R2OUT, RXD, EDGEDET)

IR RECEIVER

MAX3130/MAX3131

3V to 5.5V, IrDA Infrared Transceiver with

Integrated RS-232 Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= AVCC= 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at T

A

= +25°C and VCC= AVCC= 3.3V.)

Data rate = 2.4kbps
Data rate = 115kbps

AVCC= 3.3V

IR Receiver Disable Time Delay until I

AVCC

< 1µA 10 µs

IR Receiver Enable Time Delay until maximum IR receive data rate is valid 300 µs
IR Receiver Output Pulse Width

BAUD16 = static
(Note 3)

190

µs

AVCC= 5V

1 1.6 8

IR TRANSMITTER

Transmitter Rise Time 10% to 90% of 200mA drive current 20 600 ns
Transmitter Fall Time 90% to 10% of 200mA drive current 20 600 ns

Transmitter Output Resistance I

OUT

= 200mA

1.15 2

Ω

0.9 1.6

µs

Off-Leakage Current

1.43 2.23

V

LEDC

= 5.5V

t

PHL

t

PLH

0.01 10.0 µA

IrDA ENCODER/DECODER (ENDEC)

Maximum Operating Frequency Maximum frequency at BAUD16 2 MHz
IR Output Pulse Width f

BAUD16

= 1.8432MHz, measured at V

LEDC

BAUD16 Operating Frequency Range f

BAUD16

required to enable ENDEC 34.6 2000 kHz

RS-232 RECEIVER

Input Voltage Range -25 25 V
Input Threshold Low

VCC= 3.3V 0.6 1.2

V

VCC= 5V 0.8 1.5

Input Threshold High

VCC= 3.3V 1.5 2.4

V

VCC= 5V 1.8 2.4
Input Hysteresis 0.3 V
Input Resistance TA= +25°C 357kΩ

Receiver Propagation Delay

R_IN to R_OUT,

CL= 150pF

300

ns

300

Receiver Skew



t

PHL

- t

PLH

, C

L

= 150pF

300 ns

RS-232 TRANSMITTER OUTPUTS

Output Voltage Swing T1OUT, T2OUT, loaded with 3kΩ to GND ±5 ±5.4 V
Output Resistance VCC= V+ = V- = 0, T_OUT = ±2V 300 10M Ω
Output Short-Circuit Current V

T_OUT

= 0 ±35 ±60 mA

Output Leakage Current

V

T_OUT

= ±12V, VCC= 0 to 5.5V,

RS-232 transceiver shutdown

±25 µA

Maximum Data Rate RL= 3kΩ, CL = 1000pF, one transmitter switching 120 235 kbps
Transmitter Skew



t

PHL

- t

PLH

300 ns

PARAMETER CONDITIONS MIN TYP MAX UNITS

IR TRANSMITTER

IrDA ENCODER/DECODER (ENDEC)

RS-232 RECEIVER

RS-232 TRANSMITTER OUTPUTS

MAX3130/MAX3131

3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= AVCC= 3.3V, GND = AGND = PGND, C1–C4 = 0.1µF, RL= 3kΩ, TA = +25°C, unless otherwise noted.)

200

240
220

300
280
260

360
340
320

380

-40 0 20-20 40 60 80 100

SUPPLY CURRENT vs. TEMPERATURE

MAX3130 toc01

TEMPERATURE (°C)

I

CC

(µA)

VCC = 3.3V or 5V

90

110

100

130

120

140

150

-40 20 40-20 0 60 80 100

ANALOG SUPPLY CURRENT

vs. TEMPERATURE

MAX3130 toc02

TEMPERATURE (°C)

I

AVCC

(µA)

AVCC = 5V

AVCC = 3.3V

0

100

300

200

400

500

3.0 4.03.5 4.5 5.0 5.5

AMBIENT PHOTODIODE CURRENT

REJECTION vs. SUPPLY VOLTAGE

MAX3130 toc03

SUPPLY VOLTAGE (V)

CURRENT REJECTION (µA)

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

-40 0-20 20 40 80 100

LED DRIVER ON-RESISTANCE

vs. TEMPERATURE

MAX3130 toc04

TEMPERATURE (°C)

R

LED

(Ω)

VCC = 3.3V

VCC = 5V

I

LEDC

= 200mA

0

200

100

400

300

500

600

100 200 250150 300 350 400

LEDC VOLTAGE vs. LEDC CURRENT

MAX3130 toc05

LEDC CURRENT (mA)

LEDC VOLTAGE (mV)

PULSED AT
20% DUTY CYCLE

VCC = 3.3V

VCC = 5V

0

20

60

40

80

100

04020 60 80 100

RXD OUTPUT PULSE WIDTH

vs. DISTANCE (2400bps)

MAX3130 toc06

DISTANCE (cm)

RXD PULSE WIDTH (µs)

TRANSMITTER POWER = 200mW/sr
INPUT PULSE WIDTH = 78µs
TEMIC BPV22NF
V

CC

= 3.3V

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 V

CC

or 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.

630

MIN TYP MAX

VCC= 3.3V, RL= 3kΩ to

7kΩ, measured from

+3V to -3V or -3V to +3V,

TA = +25°C

Transition-Region Slew Rate V/µs

UNITSCONDITIONSPARAMETER

100Delay until transmitter outputs are validTransmitter Enable Time µs

CL= 150pF to 1000pF

CL= 150pF to 2500pF 430

ELECTRICAL CHARACTERISTICS (continued)

(VCC= AVCC= 3.0V to 5.5V, GND = AGND = PGND, C1–C4 = 0.1µF (Note 1), TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at T

A

= +25°C and VCC= AVCC= 3.3V.)

MAX3130/MAX3131

3V to 5.5V, IrDA Infrared Transceiver with
Integrated RS-232 Interface

_______________________________________________________________________________________

5

1.0

2.0

1.5

3.0

2.5

3.5

4.0

04020 60 80 100

RXD OUTPUT PULSE WIDTH vs. DISTANCE

(115.2 kbps)

MAX3130 toc07

DISTANCE (cm)

RXD PULSE WIDTH (µs)

TRANSMITTER POWER = 200mW/sr
INPUT PULSE WIDTH = 1.63µs
TEMIC BPV22NF
V

CC

= 3.3V

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

0

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3130 toc08

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

2000 30001000 4000 5000

V

OUT

+

1 TRANSMITTER AT 235kbps
1 TRANSMITTER AT 15kbps

V

OUT

-

0

4
2

8
6

10

12

16
14

18

0 1000 2000 3000 4000 5000

RS-232 TRANSMITTER SLEW RATE

vs. LOAD CAPACITANCE

MAX3130 toc09

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

-SLEW

+SLEW

0

5

10

15

20

25

30

35

40

0

SUPPLY CURRENT vs. LOAD CAPACITANCE

(RS-232 TRANSMITTING)

MAX3130-toc10

LOAD CAPACITANCE (pF)

I

CC

(mA)

2000 30001000 4000 5000

235kbps

1 TRANSMITTER DRIVEN ONLY

120kbps

20kbps

2V/div

2V/div

RXD OUTPUT

vs. INFRARED INPUT

MAX3130 toc11

2µs/div

RXD
OUTPUT

INFRARED
INPUT

V

CC

= 3.3V, 115.2kbps AT 1cm DISTANCE
TEMIC BPV22NF
TRANSMIT POWER 200mW/sr

2V/div

2V/div

RXD OUTPUT

vs. INFRARED INPUT

MAX3130 toc12

100µs/div

RXD
OUTPUT

INFRARED
INPUT

V

CC

= 3.3V, 2400bps AT 1cm DISTANCE
TEMIC BPV22NF
TRANSMIT POWER 200mW/sr

Typical Operating Characteristics (continued)

(VCC= AVCC= 3.3V, GND = AGND = PGND, C1–C4 = 0.1µF, RL= 3kΩ, TA = +25°C, unless otherwise noted.)