MAXIM MAX13450E, MAX13451E Technical data

19-5254; Rev 1; 11/10

RS-485 Transceivers with Integrated

100Ω/120Ω Termination Resistors

General Description

The MAX13450E/MAX13451E are half-duplex and full­duplex RS-485/RS-422 transceivers. These devices fea­ture internal 100I and 120I termination resistors. The
resistor values are pin selectable. A logic supply input
allows interfacing to logic levels down to +1.8V.

The MAX13450E/MAX13451E feature strong drivers
specified to drive low-impedance lines found when a
fully loaded bus, based on today’s 100I characteristic
impedance cable, is doubly terminated. Both devices
allow slew-rate limiting of the driver output to reduce EMI
and reflections for data rates up to 500kbps.

The MAX13451E has a FAULT alarm indication output to
signal to the system that an error condition exists in the
driver. The MAX13451E also features a logic inversion
function. The logic inversion allows phase reversal of the
A-B signals in case these are inadvertently connected
wrongly.

The MAX13450E/MAX13451E have 1/8-unit load receiver
input impedance, allowing up to 256 transceivers on the
bus. All driver outputs are protected to Q30kV ESD using
the Human Body Model (HBM).

The MAX13450E/MAX13451E are available in a 14-pin
TSSOP package and operate over the automotive -40NC
to +125NC temperature range.

Applications

Industrial Control Systems

Portable Industrial Equipment

Motor Control

Security Networks

Medical Networks

Ordering Information/

Selector Guide

PART

MAX13450EAUD+ Full 14 TSSOP-EP*
MAX13451EAUD+ Half 14 TSSOP-EP*

Note: All devices are specified over the -40°C to +125°C
operating temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.

HALF/FULL

DUPLEX

PIN-PACKAGE

Features

S 100I/120I Pin-Selectable Internal Termination

Resistors

S Driver Drives 100I Double Termination

S 20Mbps (max) Data Rate

S Pin-Selectable Slew-Rate Limiting

S Logic Supply Input Allows Interfacing Down to 1.8V

S Driver Fault-Indication Output (MAX13451E)

S Inverting of A, B Line Polarity (MAX13451E)

S High-Impedance Driver Output/Receiver Input

When VCC Supply is Removed

S Hot-Swap Input Structure on DE, RE, and TERM

S Extended ESD Protection

±30kV Human Body Model
±15kV Air Gap Discharge per IEC 61000-4-2
±7kV Contact Discharge per IEC 61000-4-2

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

the Bus

S Thermal and Overcurrent Protected

S Fail-Safe Receivers

S +4.5V to +5.5V Supply Voltage Range

Functional Diagram (MAX13451E)

V

V

L

CC

SRL

INV

FAULT

TERM

DI

DE

LOGIC-LEVEL

TRANSLATION

RE

RO

D

LOGIC

MAX13451E

B

A

MAX13450E/MAX13451E

TERM100

GND

_______________________________________________________________ Maxim Integrated Products 1

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.

RS-485 Transceivers with Integrated
100Ω/120Ω Termination Resistors

ABSOLUTE MAXIMUM RATINGS

(All voltages referenced to GND.)

VCC, VL ...................................................................-0.3V to +6V

DE, RE, DI, RO, TERM, TERM100, SRL ..... -0.3V to (VL + 0.3V)

INV, FAULT ................................................. -0.3V to (VL + 0.3V)

A, B, Z, Y ..................................................................-8V to +13V

A to B (High-Z State) ......................................................... +14V

B to A (High-Z State) ......................................................... +14V

Short-Circuit Duration (RO, Y, Z) to GND ................ Continuous

PACKAGE THERMAL CHARACTERISTICS (Note 1)

TSSOP

Junction-to-Ambient Thermal Resistance (qJA) ..........39°C/W

Junction-to-Case Thermal Resistance (qJC) .................3°C/W

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

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.

MAX13450E/MAX13451E

ELECTRICAL CHARACTERISTICS

(VCC = +4.5V to +5.5V, VL = +1.62V to VCC, TA = T
VL = +1.8V, and TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V
Logic Supply Voltage V

Supply Current I

Logic Supply Current I

Shutdown Current I

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

CC

L

CC

L

SHDN

OD

DV

OD

V

OC

DV

OC

I

OSD

DE = RE = high, TERM = high, no load
DE = RE = low, TERM = low, no load
Current into VL, no load on RO, device not

switching, DE = RE = high

Current into VCC, DE = low, RE = TERM =
high

Current into VCC, DE = low, RE = high,
TERM = low

R

DIFF

R

DIFF

R

DIFF

R

DIFF

R

DIFF

0V P V

-7V P V

to T

MIN

= 100I, Figure 1 (Note 3)
= 46I, Figure 1 (Note 3)

= 100I or 46I, Figure 1 (Note 3)

= 100I or 46I, Figure 1 (Note 3)

= 100I or 46I, Figure 1 (Note 3)

P +12V

OUT

P 0V

OUT

Continuous Power Dissipation (TA = +70NC)

TSSOP (derate 25.6mW/NC above +70NC)................2051mW

Operating Temperature Range ....................... -40NC to +125NC

Storage Temperature Range .......................... -65NC to +150NC

Junction Temperature ....................................................+150NC

Lead Temperature (soldering, 10s) ...............................+300NC

Soldering Temperature (reflow) ......................................+260NC

unless otherwise noted. Typical values are at VCC = +5V,

MAX,

4.5 5.5 V

1.62 1.8 V

2.0 V

1.5 V

VCC/2 3 V

-250

CC

6

12

2

30

8 mA

CC

CC

0.2 V

0.2 V

+280

V

mA

FA

FA

V

mA

2 ______________________________________________________________________________________

RS-485 Transceivers with Integrated

100Ω/120Ω Termination Resistors

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +4.5V to +5.5V, VL = +1.62V to VCC, TA = T
VL = +1.8V, and TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Driver Short-Circuit Foldback
Output Current

RECEIVER

Input Current (A and B) I

Receiver Differential Threshold
Voltage

Receiver Input Hysteresis

LOGIC INTERFACE

Input High Voltage V
Input Low Voltage V
Input Current I
Receiver Output High Voltage V
Receiver Output Low Voltage V

Three-State Output Current at
Receiver

Receiver Output Short-Circuit
Current

Fault Output High Voltage
(MAX13451E)

Fault Output Low Voltage
(MAX13451E)

TERMINATION RESISTOR

100I Termination Resistor
120I Termination Resistor

Single-Ended Input Capacitance
vs. GND

ESD PROTECTION

ESD Protection (A, B, Y, Z)

ESD Protection (All Other Pins) Human Body Model

I

OSDF

A, B

V

TH

DV

IN

ROH

ROL

I

OZR

I

OSR

V

FAULTH

V

FAULTL

R

100

R

120

C

(VCC - 1V) P V

-7V P V

DE = RE = GND;
TERM = VL; VCC = GND
or 5.5V

-7V P VCM P +12V,
DE = RE = GND;
TERM = VL; VCC = GND

VA + VB = 0V 15 mV

TH

DI, DE, RE, TERM, SRL, TERM100, INV

IH

DI, DE, RE, TERM, SRL, TERM100, INV

IL

DI, DE, RE, TERM, TERM100, SRL, INV
I

OUT

I

OUT

0V P VRO P V

0V P VRO P V

Fault condition, I

Nonfault condition; I

TERM = low, TERM100 = high
TERM = low, TERM100 = low

f = 1MHz (MAX13451E only) 40 pF

IN

Human Body Model

IEC 61000-4-2 Contact Discharge

to T

MIN

OUT

= -1mA VL - 0.6 V
= +1mA 0.4 V

MAX,

OUT

P 0V

L

L

OUT

unless otherwise noted. Typical values are at VCC = +5V,

P +12V

VA or VB = +12V 125

VA or VB = -7V -100

VA or VB = +12V -200 -50 mV

= -1mA VL - 0.6 V

= +1mA 0.4 V

OUT

+15

2/3 x V

L

1/3 x V

-1 +1

-1 +0.01 +1

Q1 Q80

85 100 115

101 120 139

Q30
Q15

Q7
Q2

-15

L

MAX13450E/MAX13451E

mA

FA

V
V

FA

FA

mA

I

I

kVIEC 61000-4-2 Air Gap Discharge

_______________________________________________________________________________________ 3

RS-485 Transceivers with Integrated
100Ω/120Ω Termination Resistors

SWITCHING CHARACTERISTICS—SRL = HIGH

(VCC = +4.5V to +5.5V, VL = +1.62V to VCC, TA = T
VL = +1.8V and TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DRIVER

t

Driver Propagation Delay

Differential Driver Output Skew
|t

- t

DPLH

Driver Differential Output Rise or
Fall Time

Maximum Data Rate DR

Driver Enable from Shutdown to
Output High

Driver Enable from Shutdown to
Output Low

Driver Disable Delay t
Driver Enable Delay t

RECEIVER

MAX13450E/MAX13451E

Receiver Propagation Delay

Receiver Output Skew t
Maximum Data Rate DR

Receiver Enable to Output High t

Receiver Enable to Output Low t

Receiver Disable from High t
Receiver Disable from Low t

Receiver Enable from Shutdown
to Output High

Receiver Enable from Shutdown
to Output Low

TERMINATION RESISTOR

Turn-Off Time t
Turn-On Time t

DPHL

|

DPLH

t

DPHL

t

DSKEW

t

HL

t

LH

MAX

t

DZH(SHDN)

t

DZL(SHDN)

, t

DLZ

DHZ

, t

DZL

DZH

t

RPLH

t

RPHL

RSKEW

MAX

RZH

RZL

RHZ

RLZ

t

RZH(SHDN)

t

RZL(SHDN)

RTZ

RTEN

R

DIFF

R

DIFF

R

DIFF

S2 closed, RL = 500I, CL = 100pF,
Figures 4 and 5

S1 closed, RL = 500I, CL = 100pF,
Figures 4 and 5

Figures 4 and 5 100 ns
Figures 4 and 5 2500 ns

CL = 15pF, |VID| R 2.0V; tLH, tHL P 15ns,
Figures 6 and 7

CL = 15pF, Figures 6 and 7 30 ns

S2 closed, CL = 100pF, RL = 500I,
Figures 8 and 9

S1 closed, CL = 100pF, RL = 500I,
Figures 8 and 9

Figures 8 and 9 50 ns
Figures 8 and 9 50 ns

Figures 8 and 9 5000 ns

Figures 8 and 9 5000 ns

Figure 10 120
Figure 10 1

to T

MIN

= 54I, CL = 50pF, Figures 2 and 3

= 54I, CL = 50pF, Figure 3

= 54I, CL = 50pF, Figures 2 and 3

unless otherwise noted. Typical values are at VCC = +5V,

MAX,

800
800

100 ns

100 600
100 600
500 kbps

4500 ns

5200 ns

200
200

500 kbps

50 ns

50 ns

ns

ns

ns

Fs
Fs

4 ______________________________________________________________________________________

RS-485 Transceivers with Integrated

100Ω/120Ω Termination Resistors

SWITCHING CHARACTERISTICS—SRL = LOW

(VCC = +4.5V to +5.5V, VL = +1.62V to VCC, TA = T
VL = +1.8V, and TA = +25NC.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DRIVER

t

Driver Propagation Delay

Differential Driver Output Skew
|t

- t

DPLH

Driver Differential Output Rise or
Fall Time

Maximum Data Rate DR

Driver Enable from Shutdown to
Output High

Driver Enable from Shutdown to
Output Low

Driver Disable Delay t
Driver Enable Delay t

RECEIVER

Receiver Propagation Delay

Receiver Output Skew t
Maximum Data Rate DR

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

TERMINATION RESISTOR

Turn-Off Time t
Turn-On Time t

Note 2: All devices are 100% production tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 3: Termination resistance is disabled (TERM = high).

DPHL

|

DPLH

t

DPHL

t

DSKEW

tHL, t

LH

MAX

t

DZH(SHDN)

t

DZL(SHDN)

, t

DLZ

DHZ

, t

DZL

DZH

t

RPLH

t

RPHL

RSKEW

MAX

RZH

RZL

RHZ

RLZ

t

RZH(SHDN)

t

RZL(SHDN)

RTZ

RTEN

R

DIFF

R

DIFF

R

DIFF

S2 closed, RL = 500I, CL = 100pF,
Figures 4 and 5

S1 closed, RL = 500I, CL = 100pF,
Figures 4 and 5

Figures 4 and 5 100 ns
Figures 4 and 5 100 ns

CL = 15pF, |VID| R 2.0V; tLH, tHL P 15ns,
Figures 6 and 7

CL = 15pF, Figures 6 and 7 6 ns

S2 closed, CL = 100pF, RL = 500I,
Figures 8 and 9

S1 closed, CL = 100pF, RL = 500I,
Figures 8 and 9

Figures 8 and 9 50 ns
Figures 8 and 9 50 ns

Figures 8 and 9 2000 ns

Figures 8 and 9 2000 ns

Figure 10 120
Figure 10 1

to T

MIN

= 54I, CL = 50pF, Figures 2 and 3

= 54I, CL = 50pF, Figure 3

= 54I, CL = 50pF, Figures 2 and 3

unless otherwise noted. Typical values are at VCC = +5V,

MAX,

20 Mbps

20 Mbps

50
50

6 ns

15 ns

2000 ns

2000 ns

50
50

50 ns

50 ns

ns

ns

Fs
Fs

MAX13450E/MAX13451E

_______________________________________________________________________________________ 5

RS-485 Transceivers with Integrated
100Ω/120Ω Termination Resistors

Typical Operating Characteristics

(VCC = +5V, VL = +1.8V, TA = +25NC, unless otherwise noted.)

SUPPLY CURRENT

vs. DATA RATE

70

60

RL = 54Ω

50

RL = 100Ω

40

30

SUPPLY CURRENT (mA)

20

10

NO LOAD

0

0.1 100
DATA RATE (Mbps)

101

10

9

8

MAX13450E/51E toc01

7

6

5

4

3

SHUTDOWN CURRENT (µA)

2

1

0

-40 125

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

2.0

MAX13450E/MAX13451E

I

= 1mA

OUT

1.8

1.6

1.4

0.5

0.4

MAX13450E/51E toc04

0.3

0.2

SHUTDOWN CURRENT

vs. TEMPERATURE

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

I

= 1mA

OUT

TEMPERATURE (°C)

1109565 80-10 5 20 35 50-25

5

SOURCE

MAX13450E/51E toc02

4

3

2

RECEIVER OUTPUT VOLTAGE (V)

1

SINK

0

0 70

RECEIVER PROPAGATION DELAY

100

INV = HIGH

80

MAX13450E/51E toc05

60

40

RECEIVER OUTPUT VOLTAGE

vs. OUTPUT CURRENT

MAX13450E/51E toc03

605040302010

OUTPUT CURRENT (mA)

vs. TEMPERATURE

MAX13450E/51E toc06

INV = LOW

1.2

RECEIVER OUTPUT HIGH VOLTAGE (V)

1.0

-40 125
TEMPERATURE (°C)

DRIVER DIFFERENTIAL OUTPUT CURRENT

vs. DIFFERENTIAL OUTPUT VOLTAGE

100

80

60

40

20

DRIVER DIFFERENTIAL OUTPUT CURRENT (mA)

0

0 5

DRIVER DIFFERENTIAL OUTPUT VOLTAGE (V)

0.1

RECEIVER OUTPUT LOW VOLTAGE (V)

0

1109580655035205-10-25

-40 125
TEMPERATURE (°C)

1109580655035205-10-25

TRANSMITTER OUTPUT CURRENT

vs. TRANSMITTER OUTPUT HIGH VOLTAGE

120

100

MAX13450E/51E toc07

80

60

40

20

TRANSMITTER OUTPUT CURRENT (mA)

0

4321

-7
TRANSMITTER OUTPUT HIGH VOLTAGE (V)

3-2

20

RECEIVER PROPAGATION DELAY (ns)

0

-40 125

TRANSMITTER OUTPUT CURRENT

vs. TRANSMITTER OUTPUT LOW VOLTAGE

200

180

160

MAX13450E/51E toc08

140

120

100

80

60

40

TRANSMITTER OUTPUT CURRENT (mA)

20

0

-3 12
TRANSMITTER OUTPUT LOW VOLTAGE (V)

TEMPERATURE (°C)

6 ______________________________________________________________________________________

1109580655035205-10-25

MAX13450E/51E toc09

72