MAXIM MAX13485E, MAX13486E Technical data

General Description

The MAX13485E/MAX13486E +5V, half-duplex, ±15kV ESD-protected RS-485 transceivers feature one driver and one receiver. These devices include fail-safe circuitry, guaranteeing a logic-high receiver output when receiver inputs are open or shorted. The receiver outputs a logichigh if all transmitters on a terminated bus are disabled (high impedance). The MAX13485E/MAX13486E include a hot-swap capability to eliminate false transitions on the bus during power-up or live-insertion.

The MAX13485E features reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free transmission up to 500kbps. The MAX13486E driver slew rate is not limited, allowing transmit speeds up to 16Mbps.

The MAX13485E/MAX13486E feature a 1/4-unit load receiver input impedance, allowing up to 128 transceivers on the bus. These devices are intended for half-duplex communications. All driver outputs are protected to ±15kV ESD using the Human Body Model. The MAX13485E/ MAX13486E are available in 8-pin SO and space-saving 8-pin µDFN packages. The devices operate over the extended -40°C to +85°C temperature range.

Applications

Utility Meters

Industrial Controls

Industrial Motor Drives

Automated HVAC Systems

Features

♦ +5V Operation

♦ True Fail-Safe Receiver While Maintaining

EIA/TIA-485 Compatibility

♦ Hot-Swappable for Telecom Applications

♦ Enhanced Slew-Rate Limiting Facilitates Error-

Free Data Transmission (MAX13485E)

♦ High-Speed Version (MAX13486E) Allows for

Transmission Speeds Up to 16Mbps

♦ Extended ESD Protection for RS-485/RS-422 I/O

Pins ±15kV Using Human Body Model

♦ 1/4 Unit Load, Allowing Up to 128 Transceivers on

the Bus

♦ Available in Space-Saving 8-Pin μDFN or Industry

Standard 8-Pin SO Packages

MAX13485E/MAX13486E

Half-Duplex RS-485/RS-422 Transceivers in µDFN

________________________________________________________________

Maxim Integrated Products

1

19-0742; Rev 0; 1/07

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information/

Selector Guide

+

Denotes a lead-free package. Note: All devices are specified over the -40°C to +85°C operating temperature range.

Rt

RE

RO

B

A

B

Rt

R

D

RO

DI

8

7

6

5

1

2

3

4

RE

DE

R

DI

D

DE

+

123

87465

V

CC

A GNDB

RO DIDERE

MAX13485E MAX13486E

DFN

+

A

GNDDI

1

2

87V

CC

BRE

DE

RO

SO

3

4

6

5

R

D

+

TOP VIEW

GND

V

CC

0.1μF

MAX13485E MAX13486E

Pin Configurations

PART

PINPACKAGE

MAX13485EELA+T 8 µDFN Yes L822-1

MAX13485EESA+ 8 SO Yes S8-2

MAX13486EELA+T 8 µDFN No L822-1

MAX13486EESA+ 8 SO No S8-2

SLEW-RATE

LIMITED

PKG

CODE

MAX13485E/MAX13486E

Half-Duplex RS-485/RS-422 Transceivers in µDFN

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to GND.) V

CC

........................................................................................+6V

DE, RE, DI.................................................................-0.3V to +6V

A, B ..............................................................................-8V to 13V

Short-Circuit Duration (RO, A, B) to GND ..................Continuous

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

8-Pin µDFN (derate 4.8mW/°C above +70°C) ..........380.6mW

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

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DRIVER

Change in Magnitude of Differential Output Voltage

Driver Common-Mode Output Voltage

Change in Magnitude of Common-Mode Voltage

Input-High Voltage V

Input-Low Voltage V

Input Current I

Driver Short-Circuit Output Current (Note 4)

Driver Short-Circuit Foldback Output Current Note 3)

RECEIVER

Input Current (A and B) I

Receiver-Differential-Threshold Voltage

Receiver Input Hysteresis ΔV

Output-High Voltage V

R

= 100Ω, Figure 1 2.0 V

DIFF

R

= 54Ω, Figure 1 1.5Differential Driver Output V

OD

DIFF

No load V

R

ΔV

V

OC

ΔV

IN

I

OSD

I

OSDF

A, B

V

TH

OH

OD

OC

IH

IL

TH

= 100Ω or 54Ω, Figure 1 (Note 3) 0.2 V

DIFF

R

= 100Ω or 54Ω, Figure 1

DIFF

R

= 100Ω or 54Ω, Figure 1 (Note 3) 0.2 V

DIFF

DI, DE, RE 2.0 V DI, DE, RE 0.8 V DI, DE, RE ±1 µA

0V < V

-7V < V

< +12V +50 +250

OUT

(VCC - 1V) < V

-7V < V

OUT

DE = GND, VCC = GND or +5V

-7V < VCM < +12V -200 -50 mV

VA + VB = 0V 25 mV

IO = -1.6mA, VA - VB > V

CC

V

CC

/ 2

3V

< 0V -250 -50

< +12V 20

OUT

< 0V -20

VIN = +12V 250

= -7V -200

V

IN

V

-

TH

CC

1.5

V

mA

µA

V

MAX13485E/MAX13486E

Half-Duplex RS-485/RS-422 Transceivers in µDFN

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Notes 1, 2)

SWITCHING CHARACTERISTICS—MAX13485E

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output-Low Voltage V

Tri-State Output Current at Receiver

Receiver Input Resistance R

Receiver-Output Short-Circuit Current

POWER SUPPLY

Supply Voltage V

Supply Current I

Shutdown Supply Current I

ESD PROTECTION

ESD Protection (A, B)

ESD Protection (All Other Pins) Human Body Model ±2 kV

IO = 1mA, VA - VB < -V

OL

I

OZR

IN

I

OSR

CC

SHDN

0V < VO < V

CC

-7V < VCM < +12V 48 kΩ

0V < V

RO

< V

CC

DE = 1, RE = 0, no load 4.5 mA DE = 0, RE = 1 10 µA

TH

±7 ±95 mA

4.75 5.25 V

Air Gap Discharge IEC61000-4-2 (MAX13485E)

Human Body Model ±15

0.4 V

±1 µA

±15

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DRIVER

Driver Propagation Delay

Driver-Differential Output Rise or Fall Time

Driver-Differential Output Skew

- t

|t

DPLH

DPHL

|

Maximum Data Rate 500 kbps

Driver Enable to Output High t

Driver Enable to Output Low t

Driver Disable Time from High t

Driver Disable Time from Low t

Driver Enable from Shutdown to Output High

Driver Enable from Shutdown to Output Low

Time to Shutdown t

RECEIVER

Receiver Propagation Delay

Receiver Output Skew t

Maximum Data Rate 500 kbps

t

DPLH

t

DPHL

t

HL

t

LH

t

DSKEWRDIFF

DZH

DZL

DHZ

DLZ

t

DZH(SHDN

t

DZL(SHDN

SHDN

t

RPLH

t

RPHL

RSKEW

R

= 54Ω, CL = 50pF, Figures 2 and 3

DIFF

R

= 54Ω, CL = 50pF, Figures 2 and 3

DIFF

= 54Ω, CL = 50pF, Figures 2 and 3 140 ns

Figures 4 and 5 2500 ns

Figures 4 and 5 100 ns

Figures 4 and 5 5500 ns

CL = 15pF, Figures 6 and 7

CL = 15pF, Figure 7 13 ns

200 1000

250 900

50 340 700 ns

80

kV

ns

MAX13485E/MAX13486E

Half-Duplex RS-485/RS-422 Transceivers in µDFN

4 _______________________________________________________________________________________

SWITCHING CHARACTERISTICS—MAX13485E (continued)

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

)

SWITCHING CHARACTERISTICS—MAX13486E

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Receiver Enable to Output High t

Receiver Enable to Output Low t

Receiver Disable Time from High t

Receiver Disable Time from Low t

Receiver Enable from Shutdown to Output High

Receiver Enable from Shutdown to Output Low

Time to Shutdown t

DRIVER

Driver Propagation Delay

Driver Differential Output Rise or Fall Time

Differential Driver Output Skew |t

DPLH

Maximum Data Rate 16 Mbps

Driver Enable to Output High t

Driver Enable to Output Low t

Driver Disable Time from High t

Driver Disable Time from Low t

Driver Enable from Shutdown to Output High

Driver Enable from Shutdown to Output Low

Time to Shutdown t

RECEIVER

Receiver Propagation Delay

Receiver Output Skew t

Maximum Data Rate 16 Mbps

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

- t

|

DPHL

RZH

RZL

RHZ

RLZ

t

RZH(SHDN

t

RZL(SHDN

SHDN

t

DPLH

t

DPHL

t

HL

t

LH

t

DSKEWRDIFF

DZH

DZL

DHZ

DLZ

t

DZH(SHDN

t

DZL(SHDN

SHDN

t

RPLH

t

RPHL

RSKEW

Figure 8 50 ns

Figure 8 2200 ns

50 340 700 ns

R

= 54Ω, CL = 50pF, Figures 2 and 3

DIFF

R

= 54Ω, CL = 50pF, Figures 2 and 3

DIFF

= 54Ω, CL = 50pF, Figures 2 and 3 8 ns

Figures 4 and 5 50 ns

Figures 4 and 5 2200 ns

50 340 700 ns

CL = 15pF, Figures 6 and 7

CL = 15pF, Figure 7 13 ns

50

15

80

ns

MAX13485E/MAX13486E

Half-Duplex RS-485/RS-422 Transceivers in µDFN

_______________________________________________________________________________________ 5

SWITCHING CHARACTERISTICS—MAX13486E (continued)

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.) (Note 1)

)

Note 1: µDFN devices production tested at +25°C. Overtemperature limits are generated by design. Note 2: All currents into the device are positive. All currents out of the device are negative. All voltages referred to device ground,

unless otherwise noted.

Note 3: ΔV

OD

and ΔVOCare the changes in VODand VOCwhen the DI input changes states.

Note 4: The short-circuit output current applied to peak current just prior to foldback current limiting. The short-circuit foldback

output current applies during current limiting to allow a recovery from bus contention.

Typical Operating Characteristics

(VCC= +5V, TA = +25°C, unless otherwise noted.)

3.0

3.2

3.6

3.4

3.8

4.0

-40 10-15 35 60 85

SUPPLY CURRENT vs. TEMPERATURE

MAX13485-86E toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

NO LOAD

0

7

21

14

28

35

021345

OUTPUT CURRENT vs. RECEIVER

OUTPUT HIGH VOLTAGE

MAX13485-86E toc02

OUTPUT HIGH VOLTAGE (V)

OUTPUT CURRENT (mA)

0

20

10

40

30

50

60

021345

OUTPUT CURRENT vs. RECEIVER

OUTPUT LOW VOLTAGE

MAX13485-86E toc03

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Receiver Enable to Output High t

Receiver Enable to Output Low t

Receiver Disable Time from High t

Receiver Disable Time from Low t

Receiver Enable from Shutdown to Output High

Receiver Enable from Shutdown to Output Low

Time to Shutdown t

RZH

RZL

RHZ

RLZ

t

RZH(SHDN

t

RZL(SHDN

SHDN

Figure 8 50 ns

Figure 8 2200 ns

50 340 700 ns