Maxim MAX1486EUB, MAX1486CUB, MAX1485EUB, MAX1485CUB, MAX1481CUB Datasheet

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_______________General Description

The MAX1481/MAX1484/MAX1485/MAX1486 provide
software-selectable, half-/full-duplex, low-power, slew­rate-limited, and high-speed (12Mbps) RS-485/RS-422
operation in a 10-pin µMAX package—the smallest
10-pin package available.

The software-selectable, half-/full-duplex MAX1485/
MAX1486 make obsolete the normally larger and more
expensive solutions required for selectable half-/full­duplex RS-485/RS-422 operation: 1) a 14-pin, full­duplex transceiver configured via jumpers between
receiver and transmitter lines, or 2) two 8-pin, half­duplex transceivers, which require an additional invert­er logic gate for software selectability.

The MAX1481/MAX1484 are functionally equivalent to
the industry-standard MAX491 and 75180, and are
designed for space-constrained, full-duplex RS-422
applications.

All parts contain one driver and one receiver and fea­ture a 1/8-unit-load receiver input impedance, allowing
up to 256 transceivers on the bus. The MAX1481/
MAX1485 feature reduced-slew-rate drivers that mini­mize EMI and reduce reflections caused by improperly
terminated cables, allowing error-free data transmission
up to 250kbps. The MAX1484/MAX1486 driver slew
rates are not limited, allowing them to transmit up to
12Mbps.

The MAX1481/MAX1484/MAX1485/MAX1486 draw only
300µA of supply current. The MAX1481 has a low-power
shutdown mode that reduces supply current to only

0.1µA. All devices operate from a single 5V supply.
Drivers are output short-circuit current limited and are

protected against excessive power dissipation by
thermal-shutdown circuitry that places the driver outputs
into a high-impedance state. The receiver input has a fail­safe feature that guarantees a logic-high output if the
input is open circuit.

____________________________Features

♦ 10-Pin µMAX Package: Smallest 10-Pin Package
♦ Software-Selectable Half-/Full-Duplex Operation

(MAX1485/MAX1486)

♦ 0.1µA Low-Current Shutdown Mode (MAX1481)
♦ Slew-Rate Limiting Allows Error-Free Data

Transmission (MAX1481/MAX1485)

♦ 12Mbps High-Speed Operation

(MAX1484/MAX1486)

♦ Allow up to 256 Transceivers on the Bus

________________________Applications

Low-Power RS-422/RS-485 Communications
Level Translators
Hand-Held Equipment
Battery-Powered Equipment
Transceiver for EMI-Sensitive Applications
Industrial-Control Local Area Networks

MAX1481/MAX1484/MAX1485/MAX1486

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,

12Mbps, RS-485/RS-422 Transceivers in µMAX Package

________________________________________________________________

Maxim Integrated Products

1

19-1312; Rev 0; 10/97

PART

MAX1481CUB

MAX1481EUB
MAX1484CUB

0°C to +70°C

-40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

10 µMAX
10 µMAX
10 µMAX

______________Ordering Information

______________________________________________________________Selection Table

Half/Full

Duplex

Data
Rate

(Mbps)

MAX1481 Full 0.250
MAX1484 Full 12

Part

MAX1485 Selectable 0.250
MAX1486 Selectable 12

Slew-

Rate

Limited

Yes

No

Yes

No

Low-

Power

Shutdown

Driver

Enable

Yes Yes

No Yes
No Yes
No Yes

Quiescent

Current

(µA)

300
300
300
300

Transceivers

on Bus

256
256
256
256

Pin-

Package

10 µMAX
10 µMAX
10 µMAX
10 µMAX

MAX1484EUB -40°C to +85°C 10 µMAX

Receiver

Enable

Yes
Yes

No
No

MAX1485CUB
MAX1485EUB
MAX1486CUB

0°C to +70°C

-40°C to +85°C

0°C to +70°C 10 µMAX

10 µMAX
10 µMAX

MAX1486EUB -40°C to +85°C 10 µMAX

MAX1481/MAX1484/MAX1485/MAX1486

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

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

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.

Supply Voltage (VCC) ............................................................+7V

Control Input Voltage (

RE, DE, H/F)...........-0.3V to (VCC+ 0.3V)

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

CC

+ 0.3V)

Driver Output Voltage (A, B, Y, Z)..........................-8V to +12.5V

Receiver Input Voltage, Half Duplex (Y, Z) ............-8V to +12.5V

Receiver Input Voltage, Full Duplex (A, B).............-8V to +12.5V

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

CC

+ 0.3V)

Continuous Power Dissipation

10-Pin µMAX (derate 5.6mW/°C above +70°C)............444mW

Operating Temperature Ranges

MAX148_C_ _ ......................................................0°C to +70°C

MAX148_E_ _....................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +160°C

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

R = 50Ω (RS-422), Figure 5

No load, Figure 5

-7V ≤ V

OUT

≤ 12V

DE = GND

DE, DI, RE, H/F

DE, DI, RE, H/F

R = 50Ω or 27Ω, Figure 5

R = 50Ω or 27Ω, Figure 5

R = 50Ω or 27Ω, Figure 5

DE = GND,
VCC= GND or 5.25V

DE, DI, RE, H/F

CONDITIONS

mA35 250I

OSD

Driver Output Short-Circuit
Current (Note 3)

µA

-10

I

O

10

Output Leakage (Y and Z)
(MAX1481/MAX1484 Only)

mA

0.125

I

IN2

Input Current (Y and Z for Half
Duplex, A and B for Full Duplex)

µA±2I

IN1

Input Current

2.0

V

OD1

Differential Driver Output

5

V0.8V

IL1

Input Low Voltage

V2.0V

IH1

Input High Voltage

V0.2∆V

OC

Change in Magnitude of
Common-Mode Voltage (Note 2)

V0.2∆V

OD

Change in Magnitude of
Differential Output Voltage
(Note 2)

V3V

OC

Driver Common-Mode Output
Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

DE = GND

-100

I

O

µA

125

Output Leakage (Y and Z)
(MAX1485/MAX1486 Only)

V

OD2

R = 27Ω (RS-485), Figure 5

V

1.5 5

VIN= 12V
VIN= -7V
VIN= 12V
VIN= -7V
VIN= 12V
VIN= -7V

-0.1

DRIVER

Driver Input to Output

MAX1481/MAX1484/MAX1485/MAX1486

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,

12Mbps, RS-485/RS-422 Transceivers in µMAX Package

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±5%, TA= T

MIN

to T

MAX

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

SWITCHING CHARACTERISTICS (MAX1484/MAX1486)

(VCC= 5V ±5%, TA= T

MIN

to T

MAX

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

-7V ≤ VCM≤ 12V

-7V ≤ VCM≤ 12V

IO= 4mA, VID= -200mV

IO= -4mA, VID= 200mV

0.4V ≤ VO≤ 2.4V

CONDITIONS

kΩ96R

IN

Receiver Input Resistance

µA±1I

OZR

Three-State Output Current at
Receiver

mV70∆V

TH

Receiver Input Hysteresis

mV-200 200V

TH

Receiver Differential Threshold
Voltage

V0.4V

OL

Receiver Output Low Voltage

V3.5V

OH

Receiver Output High Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

0V ≤ VRO≤ V

CC

RE = GND, DE = V

CC

mA±95I

OSR

Receiver Output Short-Circuit
Current

µA300 600I

CC

No-Load Supply Current

DE = GND, RE = V

CC

µA0.1 10I

SHDN

Supply Current in Shutdown
Mode (MAX1481 Only)

R

DIFF

= 54Ω, CL1= CL2= 100pF,

Figures 7 and 9

R

DIFF

= 54Ω, CL1= CL2= 100pF,

Figures 7 and 9

CONDITIONS

ns5 10t

DSKEW

Driver Output Skew

| t

DPLH

- t

DPHL

|

30 60t

DPLH

ns

30 60t

DPHL

Driver Input to Output

UNITSMIN TYP MAXSYMBOLPARAMETER

CL= 15pF, S1 closed, Figures 8 and 10

CL= 100pF, S2 closed, Figures 8 and 10

CL= 100pF, S1 closed, Figures 8 and 10

ns40 70t

DLZ

Driver Disable Time from Low

ns40 70t

DZH

Driver Enable to Output High

ns40 70t

DZL

Driver Enable to Output Low

Mbps12f

MAX

Maximum Data Rate

CL= 15pF, S2 closed, Figures 8 and 10

CL= 100pF, S2 closed, Figures 6 and 12

CL= 100pF, S1 closed, Figures 6 and 12

ns20 50t

RZH

Receiver Enable to Output High

ns20 50t

RZL

Receiver Enable to Output Low

ns40 70t

DHZ

Driver Disable Time from High

CL= 100pF, S2 closed, Figures 6 and 12

CL= 100pF, S1 closed, Figures 6 and 12

ns20 50t

RHZ

Receiver Disable Time from High

ns20 50t

RLZ

Receiver Disable Time from Low

Figures 11 and 13 ns5t

RSKD

| t

RPLH

- t

RPHL

| Differential

Receiver Skew

Figures 11 and 13 ns90 150

t

RPLH

,

t

RPHL

Receiver Input to Output

R

DIFF

= 54Ω, CL1= CL2= 100pF,

Figures 7 and 9

ns5 15 35tDR, t

DF

Driver Rise or Fall Time

RECEIVER

SUPPLY CURRENT

MAX1481/MAX1484/MAX1485/MAX1486

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package

4 _______________________________________________________________________________________

SWITCHING CHARACTERISTICS (MAX1481/MAX1485) (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: 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 2: ∆V

OD

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

Note 3: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during

current limiting.

Note 4: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the MAX1481

is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the MAX1481 is guaranteed to
have entered shutdown.

CL= 15pF, S1 closed, Figures 8 and 10

CL= 100pF, S2 closed, Figures 8 and 10

R

DIFF

= 54Ω, CL1= CL2= 100pF,

Figures 7 and 9

CL= 100pF, S1 closed, Figures 8 and 10

R

DIFF

= 54Ω, CL1= CL2= 100pF,

Figures 7 and 9

ns200t

DLZ

CL= 100pF, S2 closed, Figures 6 and 12

Driver Disable Time from Low

CL= 100pF, S1 closed, Figures 6 and 12

R

DIFF

= 54Ω, CL1= CL2= 100pF,

Figures 7 and 9

ns3000t

DZH

Driver Enable to Output High

ns3000

CONDITIONS

t

DZL

Driver Enable to Output Low

kbps250f

MAX

Maximum Data Rate

CL= 15pF, S2 closed, Figures 8 and 10

CL= 100pF, S2 closed, Figures 6 and 12

CL= 100pF, S1 closed, Figures 6 and 12

ns10 200t

DSKEW

Driver Output Skew

| t

DPLH

- t

DPHL

|

Figures 11 and 13

ns

ns20 50t

RZH

Receiver Enable to Output High

ns20 50t

RZL

Receiver Enable to Output Low

ns200t

DHZ

Driver Disable Time from High

ns

ns20 50t

RHZ

Receiver Disable Time from High

90 150

t

RPLH

,

t

RPHL

Receiver Input to Output

250 1000tDR, t

DF

Driver Rise or Fall Time

ns20 50t

RLZ

Receiver Disable Time from Low

Figures 11 and 13 ns15t

RSKD

| t

RPLH

- t

RPHL

| Differential

Receiver Skew

600 1000t

DPLH

ns

600 1000t

DPHL

Driver Input to Output

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX1481 only (Note 4) ns50 200 600t

SHDN

Time to Shutdown

MAX1481 only, CL= 15pF, S2 closed,
Figures 8 and 10

ns3000t

DZH(SHDN)

Driver Enable from Shutdown to
Output High

MAX1481 only, CL= 15pF, S1 closed,
Figures 8 and 10

ns3000t

DZL(SHDN)

Driver Enable from Shutdown to
Output Low

MAX1481 only, CL= 100pF, S1 closed,
Figures 6 and 12

ns1000t

RZL(SHDN)

Receiver Enable from Shutdown
to Output Low

MAX1481 only, CL= 100pF, S2 closed,
Figures 6 and 12

ns500t

RZH(SHDN)

Receiver Enable from Shutdown
to Output High

MAX1481/MAX1484/MAX1485/MAX1486

Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,

12Mbps, RS-485/RS-422 Transceivers in µMAX Package

_______________________________________________________________________________________

5

220

260

240

300

280

340

320

360

-60 -20 0-40 20 40 60 80 100

NO-LOAD SUPPLY CURRENT

vs. TEMPERATURE

MAX1481/4/5/6-01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

MAX1481/MAX1485

MAX1484/MAX1486

0

10

30

20

50

40

60

0

1

2 3 4 5

OUTPUT CURRENT vs.

RECEIVER OUTPUT LOW VOLTAGE

MAX1481/4/5/6-02

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

0

5

15

10

25

20

30

0

1

2 3 4 5

OUTPUT CURRENT vs.

RECEIVER OUTPUT HIGH VOLTAGE

MAX1481/4/5/6-03

OUTPUT LOW VOLTAGE (V)

OUTPUT CURRENT (mA)

94

98

106

102

110

114

-60 -20 0-40 20 40 60 80 100

SHUTDOWN CURRENT

vs. TEMPERATURE

MAX1481/4/5/6-04

TEMPERATURE (°C)

SHUTDOWN CURRENT (nA)

75

80

90

85

100

95

105

-60 -20 0-40 20 40 60 80 100

MAX1481/MAX1485 RECEIVER

PROPAGATION DELAY vs. TEMPERATURE

MAX1481/4/5/6-07

TEMPERATURE (°C)

PROPAGATION DELAY (ns)

C

LOAD

= 15pF

0.10

0.20

0.15

0.35

0.30

0.25

0.45

0.40

0.50

-60 -20 0-40 20 40 60 80 100

RECEIVER OUTPUT LOW VOLTAGE

vs. TEMPERATURE

MAX1481/4/5/6-05

TEMPERATURE (°C)

OUTPUT LOW VOLTAGE (V)

IRO = 8mA

3.8

4.0

3.9

4.2

4.1

4.4

4.3

4.5

-60 -20 0-40 20 40 60 80 100

RECEIVER OUTPUT HIGH VOLTAGE

vs. TEMPERATURE

MAX1481/4/5/6-06

TEMPERATURE (°C)

OUTPUT VOLTAGE (V)

IRO = 8mA

86

87

90
89

88

93
92
91

94

-60 -20 0-40 20 40 60 80 100

MAX1484/MAX1486 RECEIVER

PROPAGATION DELAY vs. TEMPERATURE

MAX1481/4/5/6-08

TEMPERATURE (°C)

PROPAGATION DELAY (ns)

C

LOAD

= 15pF

540

580

560

620

600

660

640

680

-60 -20 0-40 20 40 60 80 100

MAX1481/MAX1485 DRIVER

PROPAGATION DELAY vs. TEMPERATURE

MAX1481/4/5/6-09

TEMPERATURE (°C)

PROPAGATION DELAY (ns)

R

DIFF

= 54Ω

C

L1 = CL2 = 100pF

__________________________________________Typical Operating Characteristics

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