Datasheet

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________________General Description

The MAX3384E is a 3V-powered EIA/TIA-232 and

V.28/V.24 communications interface with low power

requirements, high data-rate capabilities, and en-

hanced electrostatic discharge (ESD) protection. All

transmitter outputs and receiver inputs are protected to

±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV

using IEC 1000-4-2 Contact Discharge, and ±15kV

using the Human Body Model.

The transceiver has a proprietary low-dropout transmit-

ter output stage, delivering true RS-232 performance

from a +3.0V to +5.5V supply with a dual charge pump.

The charge pump requires only four small 0.1µF capac-

itors for operation from a +3.3V supply. Each device is

guaranteed to run at data rates of 250kbps while main-

taining RS-232 output levels.

The MAX3384E has two receivers and two drivers. It

features a 1µA shutdown mode that reduces power con-

sumption and extends battery life in portable systems.

The MAX3384E is available in a space-saving SSOP

package in either the commercial (0°C to +70°C) or

extended temperature (-40°C to +85°C) range.

________________________Applications

Hand-Held Equipment Battery-Powered

Peripherals

Equipment

Printers PDAs

____________________________Features

♦ ESD Protection for RS-232 I/O Pins

±15kV—Human Body Model

±8kV—IEC 1000-4-2, Contact Discharge

±15kV—IEC 1000-4-2, Air-Gap Discharge

♦ Latchup Free

♦ 300µA Supply Current

♦ 1µA Low-Power Shutdown

♦ 250kbps Guaranteed Data Rate

♦ 250µs Time to Exit Shutdown with 3kΩ Load on V+

♦ 6V/µs Guaranteed Slew Rate

♦ Transmitter and Receiver Outputs High

Impedance in Shutdown

♦ Meets EIA/TIA-232 Specifications Down to 3.0V

MAX3384E

±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,

up to 250kbps, True RS-232 Transceiver

________________________________________________________________ Maxim Integrated Products 1

SHDN

GND

T1OUT

C1-

V+

C1+

N.C.

R1IN

R1OUT

T2IN

R2OUT

T2OUT

V-

C2-

C2+

R2IN

N.C.

SSOP

T1IN

N.C.

MAX3384E

TOP VIEW

MAX3384E

R2OUT

R1OUT

R2IN

GND

RS-232

OUTPUTS

TTL/CMOS

INPUTS

T2IN

T1IN

C2-

C2+

C1-

C1+

R1IN

T2OUT

T1OUT

V-

V+

0.1µF

BYPASS

+3.3V

RS-232

INPUTS

TTL/CMOS

OUTPUTS

SHDN

C3*

0.1µF

* C3 CAN BE RETURNED TO EITHER V

OR GROUND.

NOTE: SEE TABLE 2 FOR CAPACITOR SELECTION

Pin Configurations

19-1949; Rev 0; 1/01

†

Typical Operating Circuit

Ordering Information

PART

MAX3384ECAP

MAX3384EEAP -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 SSOP

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.

MAX3384ECWN 0°C to +70°C 18 SO

Pin Configurations continued at end of data sheet.

Summary of content (11 pages)

PAGE 1
9-1949; Rev 0; 1/01 ±15kV ESD-Protected, 3.0V to 5.
PAGE 2
MAX3384E ±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V Continuous Power Dissipation (TA = +70°C) V+ to GND (Note 1) ..................................................-0.3V to +7V 20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW V- to GND (Note 1) ...................................................+0.3V to -7V 18-Pin SO (derate 9.
PAGE 3
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver (V CC = +3V to +5.5V, for tests at 3.3V ±10%, C1–C4 = 0.1µF; for tests at +5V ±10%, C1 = 0.047µF, C2–C4 = 0.33µF; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER CONDITIONS MIN TYP MAX UNITS TRANSMITTER OUTPUTS Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5 ±5.
PAGE 4
__________________________________________Typical Operating Characteristics (VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) -SLEW 12 SLEW RATE (V/µs) T1 TRANSMITTING AT 250kbps T2 TRANSMITTING AT 15.
PAGE 5
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver VCC 0.1µF C1+ 0.1µF VCC C1+ V+ C1 C3 C1C2+ 3kΩ C3 C1C2+ V- VC4 C2T_ OUT T_ IN T_ OUT T_ IN R_ IN R_ OUT R_ IN R_ OUT 5kΩ SHDN 3kΩ MAX3384E C2 C4 C2- VCC V+ C1 MAX3384E C2 VCC 5kΩ 3kΩ GND 2500pF VCC SHDN MINIMUM SLEW-RATE TEST CIRCUIT GND 150pF 7kΩ MAXIMUM SLEW-RATE TEST CIRCUIT Figure 1.
PAGE 6
MAX3384E ±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver 5V/div 0 SHDN T2OUT 2V/div 0 T1OUT VCC = 3.3V C1–C4 = 0.1µF 40µs/div Figure 2. Transmitter Outputs Exiting Shutdown or Powering Up pumps are shut off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter and receiver outputs are disabled (high impedance). The time required to exit shutdown is typically 100µs, as shown in Figure 2. Connect SHDN to VCC if the shutdown mode is not used.
PAGE 7
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver RD 1500Ω CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE MAX3384E RC 1M Cs 100pF IP 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES 36.8% 10% 0 0 Figure 3a. Human Body ESD Test Model TIME tRL tDL CURRENT WAVEFORM Figure 3b.
PAGE 8
MAX3384E ±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver Transmitter Outputs when Exiting Shutdown Figure 2 shows two transmitter outputs when exiting shutdown mode. As they become active, the two transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high, the other is low). Each transmitter is loaded with 3kΩ in parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.
PAGE 9
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver TOP VIEW SYSTEM POWER-SUPPLY VOLTAGE (V) VCC SUPPLY VOLTAGE (V) 3.3 3.3 5 5 Pin Configurations (continued) COMPATIBILITY Compatible with all CMOS families 5 Compatible with all TTL and CMOS families 3.3 Compatible with ACT and HCT CMOS, and with AC, HC, or CD4000 CMOS N.C.
PAGE 10
________________________________________________________Package Information SSOP.EPS MAX3384E ±15kV ESD-Protected, 3.0V to 5.
PAGE 11
±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver SOICW.EPS 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.