Datasheet

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GND

C1+

V-

TOUTTIN

C1-

MAX3311

µMAX

TOP VIEW

RINROUT

SHDN

General Description

The MAX3311/MAX3313 are low-power, +5V EIA/TIA-

232-compatible transceivers. Both devices have one

transmitter and one receiver. The transceivers have a

proprietary low-dropout transmitter output stage

enabling RS-232-compatible operation from a +5V sup-

ply with a single inverting charge pump. These devices

require only three 0.1µF capacitors and will run at data

rates up to 460kbps while maintaining RS-232-compati-

ble output levels.

The MAX3311 features a 1µA shutdown mode. In shut-

down the device turns off the charge pump, pulls V- to

ground, and the transmitter output is disabled. The

MAX3313 features an INVALID output that asserts high

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

naling 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

♦ 1µA Low-Power Shutdown (MAX3311)

♦ INVALID Output (MAX3313)

♦ Receiver Active in Shutdown (MAX3311)

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

♦ RS-232-Compatible Operation

MAX3311/MAX3313

460kbps, 1µA Supply Current,

RS-232-Compatible Transceivers in µMAX

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

19-1901; Rev 0; 2/01

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX3311CUB 0°C to +70°C 10 µMAX

MAX3311EUB -40°C to +85°C 10 µMAX

MAX3313CUB 0°C to +70°C 10 µMAX

MAX3313EUB -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.

Pin Configurations continued at end of data sheet.

Typical Operating Circuit

0.1µF

BYPASS

0.1µF

C1+ V-

TOUT

C1-

TIN

RINROUT

GND

5kΩ

SHDN (MAX3311)

INVALID (MAX3313)

+5V

MAX3311

MAX3313

CAPACITORS MAY BE POLARIZED OR NONPOLARIZED.

Summary of content (7 pages)

PAGE 1
9-1901; Rev 0; 2/01 460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAX Features ♦ 1µA Low-Power Shutdown (MAX3311) ♦ INVALID Output (MAX3313) ♦ Receiver Active in Shutdown (MAX3311) ♦ Single Transceiver (1Tx/1Rx) in 10-Pin µMAX ♦ RS-232-Compatible Operation The MAX3311 features a 1µA shutdown mode. In shutdown the device turns off the charge pump, pulls V- to ground, and the transmitter output is disabled.
PAGE 2
MAX3311/MAX3313 460kbps, 1µA Supply Current, 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
460kbps, 1µA Supply Current, 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 ground ±3.
PAGE 4
Typical Operating Characteristics (VCC = +5V, 0.1µF capacitors, transmitter loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) +SLEW 10 8 -SLEW 6 4 2 5 4 3 460kbps/250kbps/120kbps 2 1 0 -1 -2 460kbps/250kbps/120kbps -3 -5 0 500 1000 1500 2000 2500 3000 460kbps 12 250kbps 10 120kbps 8 20kbps 6 4 2 -4 0 14 SUPPLY CURRENT (mA) 12 6 SUPPLY CURRENT vs.
PAGE 5
460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAX Single Charge-Pump Voltage Converter The MAX3311/MAX3313 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
+5V 0.1µF C1+ VCC VTIN C2 C1 C1- MAX3311 MAX3313 TIN ROUT TOUT TOUT RIN ROUT 5kΩ 1000pF 5µs/div GND Figure 3. Loopback Test Results at 120kbps Figure 2. Loopback Test Circuit INVALID HIGH TIN +2.7V TOUT ROUT RECEIVER INPUT LEVELS MAX3311/MAX3313 460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAX INDETERMINATE +0.3V 0 INVALID LOW -0.3V INDETERMINATE -2.7V INVALID HIGH 2µs/div Figure 4. Loopback Test Results at 250kbps Figure 5.
PAGE 7
460kbps, 1µA Supply Current, RS-232-Compatible Transceivers in µMAX Pin Configurations (continued) TRANSISTOR COUNT: 278 VCC 1 C1- 2 INVALID 3 TIN 4 ROUT 5 10 GND MAX3313 9 C1+ 8 V- 7 TOUT 6 RIN µMAX 10LUMAX.EPS Package Information 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.