MAXIM MAX13448E Technical data

General Description

The MAX13448E full-duplex RS-485 transceiver fea­tures inputs and outputs fault protected up to ±80V
(with respect to ground). The device operates from a
+3.0V to +5.5V supply and features true fail-safe cir­cuitry, guaranteeing a logic-high receiver output when
the receiver inputs are open or shorted. This enables all
receiver outputs on a terminated bus to output logic­high when all transmitters are disabled.

The MAX13448E features a slew-rate limited driver that
minimizes EMI and reduces reflections caused by
improperly terminated cables, allowing error-free data
transmission at data rates up to 500kbps with a +5V
supply, and 250kbps with a +3.3V supply.

The MAX13448E includes a hot-swap capability to elimi­nate false transitions on the bus during power-up or hot
insertion. The driver and receiver feature active-high and
active-low enables, respectively, that can be connected
together externally to serve as a direction control.

The MAX13448E features an 1/8-unit load receiver input
impedance, allowing up to 256 transceivers on the bus.
All driver outputs are protected to ±8kV ESD using the
Human Body Model. The MAX13448E is available in a
14-pin SO package and operates over the extended

-40°C to +85°C temperature range.

Applications

Industrial Control Systems

HVAC Control systems

Utility Meters

Motor Driver Control Systems

Features

o ±80V Fault Protection on the RS-485 I/O Ports

o True Fail-Safe Receiver

o Hot-Swap Input Structure on DE

o ESD Protection on the RS-485 I/O Ports

±8kV Human Body Model

o Slew-Rate Limiting Facilitates Error-Free Data

Transmission

o 1/8-Unit Load Allows Up to 256 Transceivers on

the Bus

o -7V to +12V Common-Mode Input Voltage Range

o +3.0V to +5.5V Operating Supply Voltage

o Available in 14-Pin SO Package

MAX13448E

±80V Fault-Protected Full-Duplex

RS-485 Transceiver

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-4098; Rev 0; 5/08

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.

Pin Configuration appears at end of data sheet.

+

Denotes a lead-free package.

R

t

RE

RO

Y

Z

DI

9

10

A

B

R

t

12

11

6, 73

R

D

R

DI

D

DE

RE

RO

N.C.

R

D

DE

GND

GND

V

CC

1μF

141

SO

+

V

CC

N.C.

132 N.C.RO

123ARE

114BDE

105ZDI

96YGND

87 N.C.GND

1, 8,

13

2

5

414

V

CC

MAX13448E

Functional Diagram

PART TEMP RANGE PIN-PACKAGE

MAX13448EESD+ -40°C to +85°C 14 SO

MAX13448E

±80V Fault-Protected Full-Duplex
RS-485 Transceiver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.0 to +5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Notes 2, 3)

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 reference to GND.)
Supply Voltage (V

CC

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

Control Input Voltage (RE, DE)...................-0.3V to (V

CC

+ 0.3V)

Driver Input Voltage (DI).............................-0.3V to (V

CC

+ 0.3V)

Receiver Input Voltage (A, B (Note 1)) ................................±80V

Driver Output Voltage (Y, Z (Note 1)) ..................................±80V

Receiver Output Voltage (RO)....................-0.3V to (V

CC

+ 0.3V)

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

Continuous Power Dissipation (T

A

= +70°C)

14-Pin SO (derate 8.3mW/°C above +70°C)................667mW

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

Note 1: If the RS-485 transmission lines are unterminated and a short to a voltage V

SHT

occurs at a remote point on the line, an active

local driver (with DI switching) may see higher voltage than V

SHT

due to inductive kickback at the driver. Terminating the line

with a resistor equal to its characteristic impedance minimizes this kickback effect.

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

VCC Supply Voltage Range V

Supply Current I

Supply Current in Shutdown
Mode

Supply Current with Output
Shorted to ±60V

DRIVER

Differential Driver Output V

Change in Magnitude of
Differential Output Voltage

Driver Common-Mode Output
Voltage

Change in Magnitude of
Common-Mode Voltage

Driver Short-Circuit Output
Current

Driver Short-Circuit Foldback
Output Current

Driver-Limit Short-Circuit
Foldback Output Current

Driver Input High Voltage V

Driver Input Low Voltage V

Driver Input Current I

CC

I

SHDN

I

SHRT

OD

ΔV

V

OC

ΔV

I

OSD

I

OSDF

I

OSDL

DIH

DIL

DIN

N o l oad , D E , D I, RE = 0V or V

Q

No load, DE, DI, RE = 0V or VCC, VCC = 5V 15
DE = GND, RE = VCC, VCC = 3.3V 100
DE = GND, RE = VCC, VCC = 5V 100
DE = GND, RE = GND, short to +60V 15
DE = GND, RE = GND, short to -60V 15

RL = 100Ω, Figure 1 2 V

RL = 54Ω, Figure 1 1.5 V

RL = 100Ω or 54Ω, Figure 1 (Note 4) -0.2 0.2 V

OD

RL = 100Ω or 54Ω, Figure 1 VCC/2 3 V

RL = 100Ω or 54Ω, Figure 1 (Note 4) -0.2 +0.2 V

OC

DI = low, 0V ≤ VY or VZ ≤ +12V +250

DI = high, -7V ≤ VY or VZ ≤ VCC (Note 5) -250

DI = low, (VCC - 1V) ≤ VY or VZ ≤ +12V +10

DI = high, -7V ≤ VY or VZ ≤ +1V -10

VY or VZ ≥ + 22V, RL = 100Ω +6

VY or VZ ≤ -13V, RL = 100Ω -6

2V

0.8 V

-1 +1 µA

, V

= 3.3V 15

C C

C C

3.0 5.5 V

CC

CC

mA

µA

mA

V

mA

mA

mA

MAX13448E

±80V Fault-Protected Full-Duplex

RS-485 Transceiver

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0 to +5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Notes 2, 3)

SWITCHING CHARACTERISTICS (VCC= +3.3V ±10%)

(TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

RECEIVER

Input Current IA,

Receiver Differential Threshold
Voltage

Receiver Input Hysteresis ΔV

Output High Voltage V

Output Low Voltage V

Three-State Output Current at
Receiver

Receiver Output Short-Circuit
Current

ESD PROTECTION

All Pins Human Body Model ±2 kV

ESD Protection Level
(A and B, Y and Z)

CONTROL

Control Input High Voltage V

Control Input Low Voltage V

Input Current Latch During First
Rising Edge

PROTECTION SPECIFICATIONS

Overvoltage Protection A, B, Y, Z -80 +80 V

V

= GND or

CC

= +3.0V to +5.5V

V

CC

25 mV

V

-

CC

0.6

-1 +1 µA

-95 +95 mA

V

I

OZR

I

OSR

I

TH

TH

OH

OL

CIH

CIL

IN

VA, VB = +12V

B

VA, VB = -7V -100 µA

VA, VB = ±80V -6 +6 mA

-7V ≤ V

IOH = -1.6mA

IOL = 1mA 0.4 V

0 ≤ VA, VB ≤ V

0 ≤ VRO ≤ V

Human Body Model ±8 kV

DE, RE 2V
DE, RE 0.8 V

DE, RE 80 µA

≤ +12V -200 -50 mV

CM

CC

CC

+125 µA

V

DRIVER

Driver Differential Propagation
Delay

Driver Differential Output
Transition Time

Differential Driver Output Skew t

Maximum Data Rate f

D r i ver E nab l e Ti m e to Outp ut H i g ht

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

t

,

DPLH

t

DPHL

, t

t

LH

DSKEW

MAX

DZH

RL = 54Ω, CL = 50pF, Figures 2 and 3 700 1500 ns

HLRL

= 54Ω, CL = 50pF, Figures 2 and 3 250 1200 ns

RL = 54Ω, CL = 50pF, t

], Figures 2 and 3

t

DPHL

RL = 500Ω, CL = 50pF, Figure 4 2000 ns

DSKEW

= [t

DPLH

-

250 kbps

150 200 ns

MAX13448E

±80V Fault-Protected Full-Duplex
RS-485 Transceiver

4 _______________________________________________________________________________________

SWITCHING CHARACTERISTICS (VCC= +3.3V ±10%) (continued)

(TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.)

SWITCHING CHARACTERISTICS (VCC= +5V ±10%)

(TA= T

MIN

to T

MAX

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

)

)

Driver Disable Time from
Output High

Driver Enable Time from
Shutdown to Output High

D r i ver E nab l e Ti m e to Outp ut Low t

Driver Disable Time from
Output Low

Driver Enable Time from
Shutdown to Output Low

Driver Time to Shutdown t

RECEIVER

Receiver Propagation Delay

Receiver Output Skew t

Receiver Enable Time to
Output High

Receiver Disable Time from
Output High

Receiver Wake Time from
Shutdown

Receiver Enable Time to
Output Low

Receiver Disable Time from
Output Low

Receiver Time to Shutdown t

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

t

DHZ

t

DZH(SHDN

DZL

t

DLZ

t

DZL(SHDN

SHDN

t

RPLH

t

RPHL

RSKEW

t

RZH

t

RHZ

t

RWAKERL

t

RZL

t

RLZ

SHDN

RL = 500Ω, CL = 50pF, Figure 4 1000 ns

RL = 500Ω, CL = 50pF, Figure 4 8 µs

RL = 500Ω, CL = 50pF, Figure 5 1500 ns

RL = 500Ω, CL = 50pF, Figure 5 2000 ns

RL = 500Ω, CL = 50pF, Figure 5 8 µs

RL = 500Ω, CL = 50pF 12 µs

,

CL = 20pF, VID = 2V, VCM = 0V,
Figure 6

CL = 20pF, t
Figure 6

RL = 1kΩ, CL = 20pF, Figure 7 1000 ns

RL = 1kΩ, CL = 20pF, Figure 7 150 ns

= 1kΩ, CL = 20pF, Figure 7 5 µs

RL = 1kΩ, CL = 20pF, Figure 7 1000 ns

RL = 1kΩ, CL = 20pF, Figure 7 150 ns

RL = 500Ω, CL = 50pF 200 ns

RSKEW

= [t

RPLH

- t

RPHL

2000 ns

],

200 ns

DRIVER

Driver Differential Propagation
Delay

Driver Differential Output
Transition Time

Differential Driver Output Skew t

Maximum Data Rate f

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

t

,

DPLH

t

DPHL

, t

t

LH

DSKEW

MAX

RL = 54Ω, CL = 50pF, Figure 3 800 ns

HLRL

= 54Ω, CL = 50pF, Figure 3 100 1200 ns

RL = 54Ω, CL = 50pF, t

], Figure 3

t

DPHL

DSKEW

= [t

DPLH

-

500 kbps

200 ns

MAX13448E

±80V Fault-Protected Full-Duplex

RS-485 Transceiver

_______________________________________________________________________________________ 5

SWITCHING CHARACTERISTICS (VCC= +5V ±10%) (continued)

(TA= T

MIN

to T

MAX

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

)

)

Note 2: Parameters are 100% production tested at TA= +25°C, unless otherwise noted. Limits over temperature are guaranteed by

design.

Note 3: All currents into the device are positive. All currents out of the device are negative. All voltages are referenced to device

ground, unless otherwise noted.

Note 4: ΔV

OD

and ΔVOCare the changes in VODand VOC, respectively, when the DI input changes state.

Note 5: The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback output

current applies during current limiting to allow a recover from bus contention.

D r i ver E nab l e Ti m e to Outp ut H i g ht

Driver Disable Time from
Output High

Driver Enable Time from
Shutdown to Output High

Driver Enable Time to Output Low t

Driver Disable Time from
Output Low

Driver Enable Time from
Shutdown to Output Low

Driver Time to Shutdown t

RECEIVER

Receiver Propagation Delay

Receiver Output Skew t

Receiver Enable Time to
Output High

Receiver Disable Time from
Output High

Receiver Wake Time from
Shutdown

Receiver Enable Time to
Output Low

Receiver Disable Time from
Output Low

Receiver Time to Shutdown t

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

DZH

t

DHZ

t

DZH(SHDN

DZL

t

DLZ

t

DZL(SHDN

SHDN

t

RPLH

t

RPHL

RSKEW

t

RZH

t

RHZ

t

RWAKERL

t

RZL

t

RLZ

SHDN

RL = 500Ω, CL = 50pF, Figure 4 1500 ns

RL = 500Ω, CL = 50pF, Figure 4 1000 ns

RL = 500Ω, CL = 50pF, Figure 4 8 µs

RL = 500Ω, CL = 50pF, Figure 5 1000 ns

RL = 500Ω, CL = 50pF, Figure 5 2 µs

RL = 500Ω, CL = 50pF, Figure 5 8 µs

RL = 500Ω, CL = 50pF 12 µs

,

CL = 20pF, VID = 2V, VCM = 0V,
Figure 6

CL = 20pF, t
Figure 6

RL = 1kΩ, CL = 20pF, Figure 7 1000 ns

RL = 1kΩ, CL = 20pF, Figure 7 150 ns

= 1kΩ, CL = 20pF, Figure 7 8 µs

RL = 1kΩ, CL = 20pF, Figure 7 1000 ns

RL = 1kΩ, CL = 20pF, Figure 7 150 ns

RL = 500Ω, CL = 50pF 150 ns

RSKEW

= [t

RPLH

- t

RPHL

],

2000 ns

200 ns