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________________General Description

The MAX212 RS-232 transceiver is intended for 3V-pow-

ered EIA/TIA-232E and V.28/V.24 communication inter-

faces where 3 drivers and 5 receivers are needed with

minimum power consumption. The operating voltage

range extends from 3.6V down to 3.0V while still main-

taining true RS-232 and EIA/TIA-562 voltage levels.

A 1µA typical shutdown mode reduces power con-

sumption, extending battery life in portable systems.

While shut down, all receivers can remain active or can

be disabled under logic control. This enables a system

incorporating the CMOS MAX212 to be in low-power

shutdown mode and monitor incoming RS-232 activity.

A guaranteed data rate of 120kbps provides compati-

bility with popular software for communicating with per-

sonal computers.

Three-state drivers on all receiver outputs are provided

so that multiple receivers, generally of different inter-

face standards, can be wire-ORed at the UART.

The MAX212 is available in both small-outline (SO) and

shrink-small-outline (SSOP) packages. The SSOP

package occupies less than half of the board area

required by the equivalent SO package.

________________________Applications

Computers

Notebooks/Palmtops/Subnotebooks

Printers

Peripherals

Instruments

____________________________Features

SUPERIOR TO BIPOLAR:

♦ Operates from Single +3.0V to +3.6V Supply

♦ 24-Pin SSOP or Wide SO Packages

♦ Meets All EIA/TIA-232E & EIA/TIA-562

Specifications

♦ 3mA Max Supply Current (Unloaded)

♦ 1µA Low-Power Shutdown Mode

♦ All Receivers Active During Low-Power Shutdown

♦ Mouse Compatible at 3.0V

♦ Low-Cost, Surface-Mount External Components

♦ 120kbps Guaranteed Data Rate—LapLink™

Compatible

♦ Three-State Receiver Outputs

♦ Evaluation Kit Available

♦ Flow-Through Pinout

MAX212

+3V-Powered, Low-Power,

True RS-232 Transceiver

________________________________________________________________

Maxim Integrated Products

Call toll free 1-800-998-8800 for free samples or literature.

PART TEMP. RANGE PIN-PACKAGE

MAX212CWG 0°C to +70°C 24 Wide SO

MAX212CAG 0°C to +70°C 24 SSOP

MAX212C/D 0°C to +70°C Dice*

MAX212EAG -40°C to +85°C 24 SSOP

MAX212EWG -40°C to +85°C 24 Wide SO

EV KIT TEMP. RANGE BOARD TYPE

MAX212EVKIT-SSOP 0°C to +70°C Surface Mount

19-0162; Rev 2; 2/94

™LapLink is a registered trademark of Traveling Software.

_______________Ordering Information

* Dice are tested at T

= +25°C only.

___________Typical Operating Circuit

MAX212

+3.3V



DC-DC CONVERTER

OUT

LP V-V+

GND

21423

SHUTDOWN

OUT

12 16

OUT

13 15

OUT

622

OUT

721

OUT

820

OUT

919

OUT

10 18

ENABLE

EVALUATION KIT

INFORMATION INCLUDED

Summary of content (8 pages)

PAGE 1
9-0162; Rev 2; 2/94 TION KIT EVALUA INCLUDED N IO T A INFORM +3V-Powered, Low-Power, True RS-232 Transceiver ____________________________Features SUPERIOR TO BIPOLAR: ♦ Operates from Single +3.0V to +3.6V Supply ♦ 24-Pin SSOP or Wide SO Packages ♦ Meets All EIA/TIA-232E & EIA/TIA-562 Specifications ♦ 3mA Max Supply Current (Unloaded) ♦ 1µA Low-Power Shutdown Mode ♦ All Receivers Active During Low-Power Shutdown ♦ Mouse Compatible at 3.
PAGE 2
MAX212 +3V-Powered, Low-Power, True RS-232 Transceiver ABSOLUTE MAXIMUM RATINGS Supply Voltages VCC .....................................................................-0.3V to +4.6V V+ ............................................................(VCC - 0.3V) to +7.4V V- ........................................................................-7.4V to +2.0V LN ..............................................................-0.3V to (V+ + 1.0V) LP.......................................................(V- - 1.
PAGE 3
+3V-Powered, Low-Power, True RS-232 Transceiver MAX212 TIMING CHARACTERISTICS (VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted.
PAGE 4
____________________________Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. LOAD CAPACITANCE 160 ALL TRANSMITTERS AT SPECIFIED CAPACITANCE AND DATA RATES w/ 3kΩ LOADS 70 SUPPLY CURRENT (mA) ALL TRANSMITTERS AT SPECIFIED DATA RATES w/ 2500pF AND 3kΩ LOADS 140 64kbps 120 100 120kbps 60 50 64kbps 40 20kbps 20kbps 20 2.5 3.0 3.5 4.0 4.
PAGE 5
+3V-Powered, Low-Power, True RS-232 Transceiver C1 0.68µF +3.3V 23 1 4 D2 1N6050 2 LN V+ 3 V CC C2 0.33µF 14 LP V- +3.3V TO ±6.5V DC-DC CONVERTER C3 0.33µF SHUTDOWN L 15µH MAX212 SD 11 T1IN T1OUT 17 T1 12 T2IN T2 13 T3IN T3 6 R1OUT T2OUT 16 T3OUT 15 R1IN 22 R1 7 R2OUT R2IN 21 R2 8 R3OUT R3IN 20 R3 9 R4OUT R4IN 19 R4 10 R5OUT R5IN 18 R5 EN 5 The switch-mode power supply uses a single inductor with two inexpensive diodes and two capacitors to generate ±6.5V from the 3.
PAGE 6
MAX212 +3V-Powered, Low-Power, True RS-232 Transceiver Operating Modes –— S D and EN determine the operation of the MAX212 as follows: V+ –— SD EN RECEIVER OUTPUTS L L High-Z High-Z Off Minimum L H Enabled High-Z Off Minimum H L High-Z Enabled On Normal H H Enabled Enabled On LN LP V- +3.
PAGE 7
+3V-Powered, Low-Power, True RS-232 Transceiver 212 GR1 TRANSMITTER OUTPUT VOLTAGE (V) 6 T1OUT AND T2OUT 4 Maxim’s MAX560 and MAX561 are EIA/TIA-562 transceivers that operate on a single supply from 3.0V to 3.6V, and the MAX562 transceiver operates from 2.7V to 5.25V while producing EIA/TIA-562 levels. ______________________Evaluation Kit T1IN AND T2IN = GND, T3IN = VCC = 3.
PAGE 8
MAX212 +3V-Powered, Low-Power, True RS-232 Transceiver _________________Pin Configuration ___________________Chip Topography V CC LP LN GND GND V+ TOP VIEW LN 1 24 GND LP 2 23 V+ VCC 3 22 R1IN SD 4 EN 5 R1OUT 6 19 R4IN R2OUT 7 18 R5IN R3OUT 8 17 T1OUT R1 OUT R4OUT 9 16 T2OUT R5OUT 10 15 T3OUT R2 OUT R3 OUT R1 IN V CC R2 IN SD EN R3 IN R4 IN R5 IN 21 R2IN MAX212 20 R3IN T1IN 11 14 V- T2IN 12 13 T3IN 0.15" (3.