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MAX1485EUB+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
_______________General Description
The MAX1481/MAX1484/MAX1485/MAX1486 provide
software-selectable, half-/full-duplex, low-power, slew-
rate-limited, and high-speed (12Mbps) RS-485/RS-422
operation in a 10-pin µMAX
®
package—the smal-
lest 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-/full-
duplex RS-485/RS-422 operation: 1) a 14-pin, full-
duplex transceiver configured via jumpers between
receiver and transmitter lines, or 2) two 8-pin, half-
duplex transceivers, which require an additional invert-
er 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 fea-
ture 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 mini-
mize 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 fail-
safe 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 1; 3/06
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
________________________________________________________________ Maxim Integrated Products 1
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.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +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 (V
CC
) ............................................................+7V
Control Input Voltage (
RE, DE, H/F)...........-0.3V to (V
CC
+ 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,
V
CC
= 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
V
IN
= 12V
V
IN
= -7V
V
IN
= 12V
V
IN
= -7V
V
IN
= 12V
V
IN
= -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)
(V
CC
= +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
SWITCHING CHARACTERISTICS (MAX1484/MAX1486)
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and T
A
= +25°C.)
-7V ≤ V
CM
≤ 12V
-7V ≤ V
CM
≤ 12V
I
O
= 4mA, V
ID
= -200mV
I
O
= -4mA, V
ID
= 200mV
0.4V ≤ V
O
≤ 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 ≤ V
RO
≤ 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, C
L1
= C
L2
= 100pF,
Figures 7 and 9
R
DIFF
= 54Ω, C
L1
= C
L2
= 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
C
L
= 15pF, S1 closed, Figures 8 and 10
C
L
= 100pF, S2 closed, Figures 8 and 10
C
L
= 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
C
L
= 15pF, S2 closed, Figures 8 and 10
C
L
= 100pF, S2 closed, Figures 6 and 12
C
L
= 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
C
L
= 100pF, S2 closed, Figures 6 and 12
C
L
= 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, C
L1
= C
L2
= 100pF,
Figures 7 and 9
ns5 15 35t
DR
, t
DF
Driver Rise or Fall Time
RECEIVER
SUPPLY CURRENT
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MAX1485EUB+

Mfr. #:
Buy MAX1485EUB+
Manufacturer:
Maxim Integrated
Description:
RS-422/RS-485 Interface IC 12Mbps RS485/RS422 Transceive
Lifecycle:
New from this manufacturer.
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