Datasheet

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General Description

The MAX3311E/MAX3313E are low-power, 5V EIA/TIA-

232-compatible transceivers. All transmitter outputs

and receiver inputs are protected to ±15kV using the

Human Body Model, making these devices ideal for

applications where more robust transceivers are

required.

Both devices have one transmitter and one receiver.

The transmitters have a proprietary low-dropout trans-

mitter output stage enabling RS-232-compatible opera-

tion from a +5V supply with a single inverting charge

pump. These transceivers require only three 0.1µF

capacitors and will run at data rates up to 460kbps

while maintaining RS-232-compatible output levels.

The MAX3311E features a 1µA shutdown mode. In

shutdown the device turns off the charge pump, pulls

V- to ground, and the transmitter output is disabled.

The MAX3313E features an INVALID output that asserts

high when an active RS-232 cable signal is connected,

signaling to the host that a peripheral is connected to

the communication port.

________________________Applications

Digital Cameras

PDAs

GPS

POS

Telecommunications

Handy Terminals

Set-Top Boxes

Features

♦ ESD Protection for RS-232-Compatible I/O Pins

±15kV—Human Body Model

♦ 1µA Low-Power Shutdown (MAX3311E)

♦ INVALID Output (MAX3313E)

♦ Receiver Active in Shutdown (MAX3311E)

♦ Single Transceiver (1Tx/1Rx) in 10-Pin µMAX

Package

MAX3311E/MAX3313E

±15kV ESD-Protected, 460kbps, 1µA,

RS-232-Compatible Transceivers in µMAX

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

19-1910; Rev 0; 1/01

Ordering Information

GND

C1+

V-

TOUTTIN

SHDN

C1-

MAX3311E

µMAX

TOP VIEW

RINROUT

PART

TEMP. RANGE

PIN-PACKAGE

MAX3311ECUB 0°C to +70°C 10 µMAX

MAX3311EEUB -40°C to +85°C 10 µMAX

MAX3313ECUB 0°C to +70°C 10 µMAX

MAX3313EEUB -40°C to +85°C 10 µMAX

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

0.1µF

BYPASS

0.1µF

C1+ V-

TOUT

RIN

C1-

TIN

ROUT

GND

SHDN (MAX3311E)

INVALID (MAX3313E)

+5V

MAX3311E

MAX3313E

CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.

Typical Operating Circuit

Pin Configurations continued at end of data sheet.

Summary of content (8 pages)

PAGE 1
9-1910; Rev 0; 1/01 ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAX The MAX3311E/MAX3313E are low-power, 5V EIA/TIA232-compatible transceivers. All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model, making these devices ideal for applications where more robust transceivers are required. Both devices have one transmitter and one receiver.
PAGE 2
MAX3311E/MAX3313E ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAX ABSOLUTE MAXIMUM RATINGS VCC to GND .............................................................-0.3V to +6V V- to GND ................................................................+0.3V to -7V VCC + |V-| ............................................................................+13V Input Voltages TIN, SHDN to GND ...............................................-0.3V to +6V RIN to GND ...........................
PAGE 3
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAX (VCC = +5V, C1 and C2 = 0.1µF, TA = TMIN to TMAX. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS RECEIVER INPUT Input Threshold Low VIL Input Threshold High VIH 0.8 V 2.4 V Input Hysteresis 0.5 V Input Resistance 5 kΩ TRANSMITTER OUTPUT Output Voltage Swing Transmitter output loaded with 3kΩ to ±3.
PAGE 4
Typical Operating Characteristics (VCC = +5V, 0.1µF capacitors, transmitter loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) 8 -SLEW 6 4 2 5 4 3 460kbps/250kbps/120kbps 2 1 0 -1 -2 460kbps/250kbps/120kbps -3 460kbps 12 SUPPLY CURRENT (mA) +SLEW 14 MAX3311E/13E-02 12 TRANSMITTER OUTPUT VOLTAGE (V) 250 kbps DATA RATE 10 6 MAX3311E/13E-01 14 SUPPLY CURRENT vs. LOAD CAPACITANCE TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE 250kbps 10 MAX3311E/13E-03 SLEW RATE vs.
PAGE 5
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAX Single Charge-Pump Voltage Converter The MAX3311E/MAX3313E internal power supply has a single inverting charge pump that provides a negative voltage from a single +5V supply. The charge pump operates in a discontinuous mode and requires a flying capacitor (C1) and a reservoir capacitor (C2) to generate the V- supply.
PAGE 6
MAX3311E/MAX3313E ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAX high data rates. Figure 2 shows a transmitter loopback test circuit. Figure 3 shows the loopback test result at 120kbps, and Figure 4 shows the same test at 250kbps. ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly.
PAGE 7
±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAX CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Pin Configurations (continued) RD 1500Ω Cs 100pF DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR Figure 5. Human Body ESD Test Model IP 100% 90% Ir VCC 1 C1- 2 INVALID 3 TIN ROUT 10 GND 9 C1+ 8 V- 4 7 TOUT 5 6 RIN MAX3313E µMAX PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES 36.
PAGE 8
______________________________________________________________Pin Description 10LUMAX.EPS MAX3311E/MAX3313E ±15kV ESD-Protected, 460kbps, 1µA, RS-232-Compatible Transceivers in µMAX Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.