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PDF MAX1487E Data sheet ( Hoja de datos )
| Número de pieza | MAX1487E | |
| Descripción | RS-485/RS-422 Transceivers | |
| Fabricantes | Maxim Integrated | |
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AVAILABLE
MAX481E/MAX483E/MAX485E/
MAX487E–MAX491E/MAX1487E
±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
General Description
The MAX481E, MAX483E, MAX485E, MAX487E–
MAX491E, and MAX1487E are low-power transceivers for
RS-485 and RS-422 communications in harsh environ-
ments. Each driver output and receiver input is protected
against ±15kV electro-static discharge (ESD) shocks,
without latchup. These parts contain one driver and one
receiver. The MAX483E, MAX487E, MAX488E, and
MAX489E feature reduced slew-rate drivers that minimize
EMI and reduce reflections caused by improperly termi-
nated cables, thus allowing error-free data transmission
up to 250kbps. The driver slew rates of the MAX481E,
MAX485E, MAX490E, MAX491E, and MAX1487E are not
limited, allowing them to transmit up to 2.5Mbps.
These transceivers draw as little as 120µA supply cur-
rent when unloaded or when fully loaded with disabled
drivers (see Selector Guide). Additionally, the MAX481E,
MAX483E, and MAX487E have a low-current shutdown
mode in which they consume only 0.5µA. All parts oper-
ate from a single +5V supply.
Drivers are short-circuit current limited, and are protected
against excessive power dissipation by thermal shutdown
circuitry that places their outputs into a high-impedance
state. The receiver input has a fail-safe feature that guar-
antees a logic-high output if the input is open circuit.
The MAX487E and MAX1487E feature quarter-unit-load
receiver input impedance, allowing up to 128 trans-
ceivers on the bus. The MAX488E–MAX491E are
designed for full-dupFleuxnccotmimounnaiclatDioinas,gwrhailme tshe
MAX481E, MAX483E, MAX485E, MAX487E, and
MAX1487E are designed for half-duplex applications.
For applications that are not ESD sensitive see the pin-
and function-compatible MAX481, MAX483, MAX485,
MAX487–MAX491, and MAX1487.
Applications
Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Next-Generation Device Features
♦ For Fault-Tolerant Applications:
MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4-
Unit Load, +3.3V, RS-485 Transceiver
MAX3080–MAX3089: Fail-Safe, High-Speed
(10Mbps), Slew-Rate-Limited, RS-485/RS-422
Transceivers
♦ For Space-Constrained Applications:
MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,
Profibus, RS-485/RS-422 Transceivers
MAX3362: +3.3V, High-Speed, RS-485/RS-422
Transceiver in a SOT23 Package
MAX3280E–MAX3284E: ±15kV ESD-Protected,
52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422
True Fail-Safe Receivers
MAX3030E–MAX3033E: ±15kV ESD-Protected,
+3.3V, Quad RS-422 Transmitters
♦ For Multiple Transceiver Applications:
MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,
SOT23, RS-485/RS-422 Transmitters
♦ For Fail-Safe Applications:
MAX3440E–MAX3444E: ±15kV ESD-Protected,
±60V Fault-Protected, 10Mbps, Fail-Safe
RS-485/J1708 Transceivers
♦ For Low-Voltage Applications:
MAX3483E/MAX3485E/MAX3486E/MAX3488E/
MAX3490E/MAX3491E: +3.3V Powered, ±15kV
ESD-Protected, 12Mbps, Slew-Rate-Limited,
True RS-485/RS-422 Transceivers
Ordering Information
PART
MAX481ECPA
MAX481ECSA
MAX481EEPA
MAX481EESA
MAX483ECPA
MAX483ECSA
MAX483EEPA
MAX483EESA
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0410; Rev 4; 10/03
1 page  
MAX481E/MAX483E/MAX485E/
MAX487E–MAX491E/MAX1487E
±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICS
Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device
ground unless otherwise specified.
Note 2: All typical specifications are given for VCC = 5V and TA = +25°C.
Note 3: Supply current specification is valid for loaded transmitters when DE = 0V.
Note 4:
Note 5:
Applies to peak current. See Typical Operating
The MAX481E/MAX483E/MAX487E are put into
Characteristics.
shutdown by bringing
R–—E–
high
and
DE
low.
If
the
inputs
are
in
this
state
for
less than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are
guaranteed to have entered shutdown. See Low-Power Shutdown Mode section.
__________________________________________Typical Operating Characteristics
(VCC = 5V, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
50
45
40
35
30
25
20
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5
OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
-25
-20
-15
-10
-5
0
1.5
2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT HIGH VOLTAGE (V)
5.0
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
4.8
4.6
IRO = 8mA
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
0.9
0.8
IRO = 8mA
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
DRIVER OUTPUT CURRENT vs.
DIFFERENTIAL OUTPUT VOLTAGE
90
80
70
60
50
40
30
20
10
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
Maxim Integrated
5
5 Page 
MAX481E/MAX483E/MAX485E/
MAX487E–MAX491E/MAX1487E
±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
3V
DE
DI
Y
VID
Z
CL1
RDIFF
CL2
A
B
RO
RE
OUTPUT
UNDER TEST
500Ω
CL
VCC
S1
S2
Figure 10. Driver/Receiver Timing Test Circuit
3V
DI
0V
1.5V
Z
Y
VDIFF
VO
0V
-VO
VO
1/2 VO
10%
tR
1.5V
tPLH tPHL
1/2 VO
VDIFF = V (Y) - V (Z)
90% 90%
tF
tSKEW = | tPLH - tPHL |
10%
Figure 12. Driver Propagation Delays
VOH
RO
VOL
A-B VID
-VID
0V
1.5V
tPHL
OUTPUT
tPLH
INPUT
1.5V
0V
Figure 14. Receiver Propagation Delays
Figure 11. Driver Timing Test Load
3V
DE
0V
Y, Z
VOL
Y, Z
0V
1.5V
1.5V
tZL(SHDN), tZL
tLZ
2.3V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.3V
tZH(SHDN), tZH
tHZ
VOL +0.5V
VOH -0.5V
Figure 13. Driver Enable and Disable Times (except MAX488E
and MAX490E)
3V
RE
0V
VCC
RO
1.5V
RO
0V
1.5V
tZL(SHDN), tZL
tLZ
1.5V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
1.5V
tZH(SHDN), tZH
tHZ
VOL + 0.5V
VOH - 0.5V
Figure 15. Receiver Enable and Disable Times (except MAX488E
and MAX490E)
Maxim Integrated
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX1487E.PDF ] | |
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