Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - transceivers RS485 1/1 SOIC 8 Exposed Pad

General Description

The MAX13410E–MAX13415E are half-duplex RS-485-/RS-

422-compatible transceivers optimized for isolated appli-

cations. These devices feature an internal low-dropout

regulator (LDO), one driver, and one receiver. The inter-

nal LDO allows the part to operate from an unregulated

power supply of up to 28V. The AutoDirection feature

reduces the number of optical isolators needed in isolat-

ed applications. Other features include enhanced ESD

protection, fail-safe circuitry, slew-rate limiting, and full-

speed operation.

The MAX13410E–MAX13415E internal LDO generates a

5V ±10% power supply that is used to power its internal

circuitry. The MAX13412E–MAX13415E bring the 5V to an

output V

REG

that allows the user to power additional

external circuitry with up to 20mA to further reduce exter-

nal components. The MAX13410E/MAX13411E do not

have a 5V output and come in industry-compatible

pinouts. This allows easy replacement in existing designs.

The MAX13410E–MAX13415E feature a 1/8-unit load

receiver input impedance, allowing up to 256 trans-

ceivers on the bus. All driver outputs are ESD protected

using the Human Body Model. These devices also

include fail-safe circuitry (MAX13410E/MAX13411E/

MAX13414E/MAX13415E only), guaranteeing a logic-

high receiver output when the receiver inputs are open

or shorted. The receiver outputs a logic-high when the

transmitter on the terminated bus is disabled (high

impedance).

The MAX13412E/MAX13413E feature Maxim’s propri-

etary AutoDirection control. This architecture eliminates

the need for the DE and RE control signals. In isolated

applications, this reduces the cost and size of the sys-

tem by reducing the number of optical isolators required.

The MAX13410E/MAX13412E/MAX13414E feature

reduced slew-rate drivers that minimize EMI and reduce

reflections caused by improperly terminated cables,

allowing error-free transmission up to 500kbps. The

MAX13411E/MAX13413E/MAX13415E are not slew-rate

limited, allowing transmit speeds up to 16Mbps.

The MAX13410E–MAX13415E are available in an 8-pin

SO package with an exposed paddle to improve power

dissipation, and operate over the extended -40°C to

+85°C temperature range.

Features

♦ Wide +6V to +28V Input Supply Range

♦ +5V Output Supplies Up to 20mA to External

Circuitry

♦ Internal LDO

♦ Low 65µA (typ) Shutdown Supply Current

♦ Extended ESD Protection

±15kV Human Body Model (MAX13412E/

MAX13413E)

±14kV Human Body Model (MAX13410E/

MAX13411E)

♦ 1/8-Unit Load, Allowing Up to 256 Transceivers on

the Bus

♦ -40°C to +85°C Operating Temperature Range

♦ Fail-Safe

♦ Slew-Rate Limited and Full-Speed Versions

♦ Up to 16Mbps Data Rate on Full-Speed Versions

Applications

MAX13410E–MAX13415E

RS-485 Transceiver with Integrated Low-Dropout

Regulator and AutoDirection Control

________________________________________________________________

Maxim Integrated Products

19-1058; Rev 1; 8/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

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

Ordering Information/Selector Guide

Note: All devices operate over the -40°C to +85°C operating

temperature range.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

Ordering Information/Selector Guide continued at end of data

sheet.

PART PIN-PACKAGE AutoDirection DATA RATE (max) 5V LDO OUTPUT

MAX13410EESA+ 8 SO-EP* No 500kbps No

MAX13411EESA+ 8 SO-EP* No 16Mbps No

Isolated RS-485 Interfaces

Utility Meters

Industrial Equipment

Telecomm Equipment

GNDDI

BRE

TOP VIEW

MAX13410E

MAX13411E

*EP

*EXPOSED PAD CONNECTED TO GROUND

Pin Configurations

Pin Configurations continued at end of data sheet.

Summary of content (24 pages)

PAGE 1
9-1058; Rev 1; 8/09 RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control Features ♦ Wide +6V to +28V Input Supply Range ♦ +5V Output Supplies Up to 20mA to External Circuitry ♦ Internal LDO ♦ Low 65µA (typ) Shutdown Supply Current ♦ Extended ESD Protection ±15kV Human Body Model (MAX13412E/ MAX13413E) ±14kV Human Body Model (MAX13410E/ MAX13411E) ♦ 1/8-Unit Load, Allowing Up to 256 Transceivers on the Bus ♦ -40°C to +85°C Operating Temperature Range ♦ Fail-Safe ♦ Slew-Rate Li
PAGE 2
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC .........................................................................-0.3V to +30V RE, DE/RE, DE, DI, RO, VREG ..................................-0.3V to +6V A, B............................................................................-8V to +13V Short-Circuit Duration (RO, A, B) to GND .................
PAGE 3
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control (VCC = +6.0V to +28V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +7.5V, CS = 1µF, and TA = +25°C.
PAGE 4
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control SWITCHING CHARACTERISTICS–MAX13410E (continued) (VCC = +6.0V to +28V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +7.5V, CS = 1µF, and TA = +25°C.
PAGE 5
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control (VCC = +6.0V to +28V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +7.5V, CS = 1µF, and TA = +25°C.
PAGE 6
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control SWITCHING CHARACTERISTICS–MAX13412E (continued) (VCC = +6.0V to +28V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +7.5V, CS = 1µF, and TA = +25°C.
PAGE 7
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control (VCC = +6.0V to +28V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +7.5V, CS = 1µF, and TA = +25°C.
PAGE 8
SWITCHING CHARACTERISTICS–MAX13415E (continued) (VCC = +6.0V to +28V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +7.5V, CS = 1µF, and TA = +25°C.
PAGE 9
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control 5.0 4.8 4.6 4.4 IO = -1mA 0.4 0.3 0.2 80 0.1 MAX13410E-15E toc06 OUTPUT HIGH VOLTAGE (V) 5.2 0.5 OUTPUT CURRENT (mA) IO = +1mA OUTPUT LOW VOLTAGE (V) MAX13410E-15E toc04 5.4 DIFFERENTIAL OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE MAX13410E-15E toc05 RECEIVER OUTPUT LOW VOLTAGE vs. TEMPERATURE RECEIVER OUTPUT HIGH VOLTAGE vs. TEMPERATURE 60 40 20 4.2 4.
PAGE 10
Typical Operating Characteristics (continued) (VCC = +7.5V, TA = +25°C, unless otherwise noted.) RECEIVER PROPAGATION vs.TEMPERATURE (MAX13410E/MAX13412E) RECEIVER PROPAGATION vs.
PAGE 11
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control A RDIFF / 2 VOD CL RDIFF / 2 VOC B Figure 1. Driver DC Test Load 5V DE RL A DI VID RDIFF DI CL B A VREG GND VID B CL RL Figure 2a. Driver-Timing Test Circuit Figure 2b. Driver-Timing Test Circuit f = 1MHz, tLH ≤ 3ns, tHL ≤ 3ns 5V DI 1.5V 1.5V 0 1/2 VO tDPHL tDPLH B A 1/2 VO VO VDIFF = VA - VB VO VDIFF 90% 90% 0 -VO 10% 10% tHL tLH tDSKEW = |tDPLH - tDPHL| Figure 3a.
PAGE 12
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control MAX13410E–MAX13415E Test Circuits and Waveforms (continued) RE = VCC 5V f = 1MHz, tLH ≤ 3ns, tHL ≤ 3ns 1.5V DI 1.5V 0 1/2 VO tDPHL tDPLH B VO A 1/2 VO RO tDDD, tRED (RO PULLED LOW) O VDIFF = VA - VB VO VDIFF 90% 90% 0 10% 10% -VO tHL tLH Figure 3b. Driver Propagation Delays VCC 1.5V DE 1.5V 0 tDLZ tDZL(SHDN) A, B 500Ω OUTPUT UNDER TEST S1 2.3V 5V OUTPUT NORMALLY LOW VOL S2 CL VOL + 0.
PAGE 13
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control f = 1MHz, tLH ≤ 3ns, tHL ≤ 3ns A 1V -1V B tRPLH tRPHL VOH RO 1.5V VOL 1.5V tRSKEW = | tRPHL - tRPLH | Figure 6. Receiver Propagation Delays VREG RE 1.5V 1.5V 0 tRZL(SHDN), tRZL tRHZ 2.3V VOH + 0.5V VREG 1kΩ RO CL 15pF S1 5V RO 0 S2 OUTPUT NORMALLY HIGH VREG RO OUTPUT NORMALLY LOW 2.3V VOH + 0.5V tRZH(SHDN), tRZH tRHZ 0 DI = 0V Figure 7.
PAGE 14
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control Pin Description PIN MAX13410E/ MAX13411E MAX13412E/ MAX13413E MAX13414E/ MAX13415E NAME FUNCTION 1 — 1 RO Receiver Output. When receiver is enabled and VA - VB ≥ -50mV, RO is high. If VA - VB ≤ -200mV, RO is low. Note: RO is referenced to the LDO output (VREG). 2 — — RE Receiver Output Enable. Drive RE low to enable RO.
PAGE 15
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control RECEIVING TRANSMITTING INPUT MAX13410E–MAX13415E Function Tables for the MAX13410E/MAX13411E INPUT OUTPUT OUTPUT RE DE DI B A RE DE A-B RO X 1 1 0 1 0 X > -50mV 1 X < -200mV 0 X 1 0 1 0 0 0 0 X High impedance High impedance 0 X Open/Short 1 1 0 X 1 1 X High impedance 1 0 X High impedance (shutdown) High impedance (shutdown) X = Don’t care, shutdown mode, driver, and receiv
PAGE 16
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control Detailed Description The MAX13410E–MAX13415E are half-duplex RS-485/ RS-422-compatible transceivers optimized for isolated applications. These devices feature an internal LDO regulator, one driver, and one receiver. The internal LDO allows the part to operate from an unregulated +6V to +28V power supply. The AutoDirection feature reduces the number of optical isolators needed in isolated applications.
PAGE 17
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control Functional Diagram for the MAX13410E/MAX13411E/MAX13414E/MAX13415E MAX13410E MAX13411E MAX13414E MAX13415E + + RO 1 LDO 8 VCC RE 2 7 B DE 6 A 5 GND R 3 D DI 4 RO 1 LDO 8 VCC DE/RE 2 7 B 3 6 A 5 GND VREG R D DI 4 Functional Diagram for the MAX13412E/MAX13413E LDO VREG MAX13412E MAX13413E 1 RO 2 RE VCC 8 VREG + R - 3 RE VREG - VDT B 7 COM + RI DI A 6 STATE MACHINE DE VREG 4
PAGE 18
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control the MAX13410E–MAX13415E. The circuit-board designer has no control over this parameter. Fail Safe The MAX13410E/MAX13411E/MAX13414E/MAX13415E guarantee a logic-high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. This is done by setting the receiver input threshold between -50mV and -200mV.
PAGE 19
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RD 1500Ω IP 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPS DEVICE UNDER TEST 36.8% 10% 0 0 Figure 8a. Human Body ESD Test Model ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.
PAGE 20
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control Rt UNREGULATED ISOLATED POWER SUPPLY ISO_VCC VSYS + MCU AND RELATED CIRCUITRY ISO_VCC N RO RE DE ISO_VCC DI 1 LDO R 8 ISO_VCC 0.1μF 2 7 3 6 4 VCC 5 D B A GND MAX13410E MAX13411E Rt Figure 9. Typical Application Circuit for the MAX13410E/MAX13411E transmission line design.
PAGE 21
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control MAX13410E–MAX13415E Rt ISO_VCC UNREGULATED ISOLATED POWER SUPPLY VSYS + RO MCU AND RELATED CIRCUITRY 1 R LDO 8 VCC 0.1μF ISO_VCC RE ISO_VCC 2 ISO_VCC VREG VSYS CS DETECT CIRCUIT 7 3 6 1μF DI 5 D 4 MAX13412E MAX13413E B A GND ISO_VCC Rt Figure 10. Typical Application Circuit for the MAX13412E/MAX13413E ground loops.
PAGE 22
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control Rt ISO_VCC UNREGULATED ISOLATED POWER SUPPLY VSYS ISO_VCC + VSYS RO MCU AND RELATED CIRCUITRY DE/RE ISO_VCC LDO R 8 2 7 3 6 VCC 0.1μF B ISO_VCC VREG CS VSYS 1 1μF DI 5 D 4 A GND MAX13414E MAX13415E Rt Figure 11.
PAGE 23
RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control TOP VIEW RO 1 + RE 2 VREG 3 MAX13412E MAX13413E DI 4 *EP 8 VCC 7 B RO 1 DE/RE 2 VREG 6 A 5 GND 3 + MAX13414E MAX13415E DI 4 *EP 8 VCC 7 B 6 A 5 GND SO SO *EXPOSED PAD CONNECTED TO GROUND Ordering Information/Selector Guide (continued) PART PIN-PACKAGE AutoDirection DATA RATE (max) 5V LDO OUTPUT MAX13412EESA+ 8 SO-EP* Yes 500kbps Yes MAX13413EESA+ 8 SO-EP* Yes 16Mbps Yes MAX134
PAGE 24
MAX13410E–MAX13415E RS-485 Transceiver with Integrated Low-Dropout Regulator and AutoDirection Control Revision History REVISION NUMBER REVISION DATE 0 11/07 1 8/09 DESCRIPTION PAGES CHANGED Initial release. — Replaced Figure 9. 20 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.