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PDF MAX491ECPD Data sheet ( Hoja de datos )
| Número de pieza | MAX491ECPD | |
| Descripción | 15kV ESD-Protected / Slew-Rate-Limited / Low-Power / RS-485/RS-422 Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0410; Rev 3; 7/96
±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
_______________General Description ____________________________Features
The MAX481E, MAX483E, MAX485E, MAX487E–MAX491E,
and MAX1487E are low-power transceivers for RS-485 and
RS-422 communications in harsh environments. 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 terminated 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.
o ESD Protection: ±15kV—Human Body Model
o Slew-Rate Limited for Error-Free Data
Transmission (MAX483E/487E/488E/489E)
o Low Quiescent Current:
120µA (MAX483E/487E/488E/489E)
230µA (MAX1487E)
300µA (MAX481E/485E/490E/491E)
o -7V to +12V Common-Mode Input Voltage Range
o Three-State Outputs
These transceivers draw as little as 120µA supply current
when unloaded or when fully loaded with disabled drivers
(see Selection Table). Additionally, the MAX481E,
MAX483E, and MAX487E have a low-current shutdown
mode in which they consume only 0.5µA. All parts operate
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 guaran-
tees a logic-high output if the input is open circuit.
o 30ns Propagation Delays, 5ns Skew
(MAX481E/485E/490E/491E/1487E)
o Full-Duplex and Half-Duplex Versions Available
o Allows up to 128 Transceivers on the Bus
(MAX487E/MAX1487E)
o Current Limiting and Thermal Shutdown for
Driver Overload Protection
The MAX487E and MAX1487E feature quarter-unit-load
receiver input impedance, allowing up to 128 transceivers
on the bus. The MAX488E–MAX491E are designed for full-
duplex communications, while the MAX481E, MAX483E,
MAX485E, MAX487E, and MAX1487E are designed for half-
duplex applications. For applications that are not ESD sen-
sitive see the pin- and function-compatible MAX481,
MAX483, MAX485, MAX487–MAX491, and MAX1487.
______________Ordering Information
PART
MAX481ECPA
MAX481ECSA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
________________________Applications
Low-Power RS-485 Transceivers
MAX481EEPA
MAX481EESA
-40°C to +85°C
-40°C to +85°C
8 Plastic DIP
8 SO
Low-Power RS-422 Transceivers
Ordering Information continued on last page.
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
______________________________________________________________Selection Table
PART
NUMBER
MAX481E
MAX483E
MAX485E
MAX487E
MAX488E
MAX489E
MAX490E
MAX491E
MAX1487E
HALF/FULL DATA RATE SLEW-RATE LOW-POWER
DUPLEX
(Mbps)
LIMITED
SHUTDOWN
Half 2.5 No Yes
Half 0.25 Yes Yes
Half 2.5 No No
Half 0.25 Yes Yes
Full 0.25
Yes
No
Full 0.25
Yes
No
Full 2.5 No No
Full 2.5 No No
Half 2.5 No No
RECEIVER/
DRIVER
ENABLE
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
QUIESCENT
CURRENT
(µA)
300
120
300
120
120
120
300
300
230
NUMBER OF
TRANSMITTERS
ON BUS
32
32
32
128
32
32
32
32
128
PIN
COUNT
8
8
8
8
8
14
8
14
8
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
±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: Applies to peak current. See Typical Operating Characteristics.
Note 5: The MAX481E/MAX483E/MAX487E are put into 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)
_______________________________________________________________________________________ 5
5 Page 
±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
Figure 11. Driver Timing Test Load
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
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)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX491ECPD.PDF ] | |
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