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PDF MAX13486E Data sheet ( Hoja de datos )

Número de pieza MAX13486E
Descripción (MAX13485E / MAX13486E) Half Duplex Transceiveer
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! MAX13486E Hoja de datos, Descripción, Manual

19-0742; Rev 0; 1/07
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Half-Duplex RS-485/RS-422 Transceivers in µDFN
General Description
The MAX13485E/MAX13486E +5V, half-duplex, ±15kV
ESD-protected RS-485 transceivers feature one driver
and one receiver. These devices include fail-safe circuitry,
guaranteeing a logic-high receiver output when receiver
inputs are open or shorted. The receiver outputs a logic-
high if all transmitters on a terminated bus are disabled
(high impedance). The MAX13485E/MAX13486E include
a hot-swap capability to eliminate false transitions on the
bus during power-up or live-insertion.
The MAX13485E features reduced slew-rate drivers
that minimize EMI and reduce reflections caused by
improperly terminated cables, allowing error-free trans-
mission up to 500kbps. The MAX13486E driver slew
rate is not limited, allowing transmit speeds up to
16Mbps.
The MAX13485E/MAX13486E feature a 1/4-unit load
receiver input impedance, allowing up to 128 transceivers
on the bus. These devices are intended for half-duplex
communications. All driver outputs are protected to ±15kV
ESD using the Human Body Model. The MAX13485E/
MAX13486E are available in 8-pin SO and space-saving
8-pin µDFN packages. The devices operate over the
extended -40°C to +85°C temperature range.
Applications
Utility Meters
Industrial Controls
Industrial Motor Drives
Automated HVAC Systems
TOP VIEW
VCC
8
B
7
A GND
65
Features
o +5V Operation
o True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
o Hot-Swappable for Telecom Applications
o Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission (MAX13485E)
o High-Speed Version (MAX13488E) Allows for
Transmission Speeds Up to 16Mbps
o Extended ESD Protection for RS-485/RS-422 I/O
Pins ±15kV Using Human Body Model
o 1/4 Unit Load, Allowing Up to 128 Transceivers on
the Bus
o Available in Space-Saving 8-Pin µDFN or Industry
Standard 8-Pin SO Packages
Ordering Information/
Selector Guide
PART
PIN-
SLEW-RATE PKG
PACKAGE LIMITED
CODE
MAX13485EELA+T
MAX13485EESA+
MAX13486EELA+T
MAX13486EESA+
8 µDFN
8 SO
8 µDFN
8 SO
Yes L822-1
Yes S8-2
No L822-1
No S8-2
+Denotes a lead-free package.
Note: All devices are specified over the -40°C to +85°C operating
temperature range.
Pin Configurations
MAX13485E
MAX13486E
MAX13485E
MAX13486E
+
123
RO RE DE
DFN
RO 1
RE 2
+
R
DE 3
DI 4
D
4
DI
8 VCC
7B
6A
5 GND
RO
1
+
R
RE 2
DE 3
DI 4 D
SO
SO
0.1µF
8 VCC
7B
Rt
6
5A
GND
B
Rt
A
DE
D DI
R RO
RE
________________________________________________________________ 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.

1 page




MAX13486E pdf
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Half-Duplex RS-485/RS-422 Transceivers in µDFN
SWITCHING CHARACTERISTICSMAX13486E (continued)
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable Time from High
Receiver Disable Time from Low
Receiver Enable from Shutdown
to Output High
SYMBOL
tRZH
tRZL
tRHZ
tRLZ
Figure 8
Figure 8
Figure 8
Figure 8
tRZH(SHDN) Figure 8
CONDITIONS
MIN TYP MAX UNITS
50 ns
50 ns
50 ns
50 ns
2200
ns
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN) Figure 8
2200
ns
Time to Shutdown
tSHDN
50 340 700 ns
Note 1: µDFN devices production tested at +25°C. Overtemperature limits are generated by design.
Note 2: All currents into the device are positive. All currents out of the device are negative. All voltages referred to device ground,
unless otherwise noted.
Note 3: VOD and VOC are the changes in VOD and VOC when the DI input changes states.
Note 4: The short-circuit output current applied to peak current just prior to foldback current limiting. The short-circuit foldback
output current applies during current limiting to allow a recovery from bus contention.
(VCC = +5V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT vs. TEMPERATURE
4.0
NO LOAD
3.8
3.6
3.4
3.2
3.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
OUTPUT CURRENT vs. RECEIVER
OUTPUT HIGH VOLTAGE
35
28
21
14
7
0
012 345
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT vs. RECEIVER
OUTPUT LOW VOLTAGE
60
50
40
30
20
10
0
012345
OUTPUT LOW VOLTAGE (V)
_______________________________________________________________________________________ 5

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MAX13486E arduino
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Half-Duplex RS-485/RS-422 Transceivers in µDFN
Test Circuits and Waveforms (continued)
+1V S3
-1V VID
1k
CL
15pF
S1
VCC
S2
GENERATOR
50
S1 OPEN
S2 CLOSED
S3 = +1V
VCC
VCC/2
RE 0
tRZH, tRZH(SHDN)
VOH
RO
VOH/2
0
S1 OPEN
S2 CLOSED
S3 = +1V
VCC/2
RE
tRHZ
RO
0.25V
Figure 8. Receiver Enable and Disable Times
VCC
0
VOH
0
RE
RO
RE
S1 CLOSED
S2 OPEN
S3 = -1V
VCC/2
VCC
0
tRZL, tRZL(SHDN)
VCC
(VOL + VCC)/2
VOL
S1 CLOSED
S2 OPEN
S3 = -1V
VCC/2
tRLZ
VCC
0
VCC
RO 0.25V
VOL
__________________________________________________________________________

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