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PDF MAX13488E Data sheet ( Hoja de datos )
| Número de pieza | MAX13488E | |
| Descripción | Half-Duplex RS-485-/RS-422- Compatible Transceiver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX13488E (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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MAX13487E/MAX13488E
EVALUATION KIT AVAILABLE
Half-Duplex RS-485-/RS-422-
Compatible Transceiver with
AutoDirection Control
General Description
The MAX13487E/MAX13488E +5V, half-duplex, ±15kV
ESD-protected RS-485/RS-422-compatible transceivers
feature one driver and one receiver. The MAX13487E/
MAX13488E include a hot-swap capability to eliminate
false transitions on the bus during power-up or live
insertion.
The MAX13487E/MAX13488E feature Maxim’s propri-
etary AutoDirection control. This architecture makes the
devices ideal for applications, such as isolated RS-485
ports, where the driver input is used in conjunction with
the driver-enable signal to drive the differential bus.
The MAX13487E 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 MAX13488E driver slew
rate is not limited, allowing transmit speeds up to
16Mbps.
The MAX13487E/MAX13488E feature a 1/4-unit load
receiver input impedance, allowing up to 128 trans-
ceivers 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 MAX13487E/MAX13488E are available in an 8-pin
SO package. The devices operate over the extended
-40°C to +85°C temperature range.
Applications
Isolated RS-485 Interfaces
Utility Meters
Industrial Controls
Industrial Motor Drives
Automated HVAC Systems
Ordering Information/
Selector Guide
PART
PIN-PACKAGE
SLEW-RATE
LIMITED
MAX13487EESA+ 8 SO
Yes
MAX13488EESA+ 8 SO
No
+Denotes a lead(Pb)-free/RoHS-compliant package.
Note: All devices operate over the -40°C to +85°C temperature
range.
Benefits and Features
• AutoDirection Saves Space and BOM Cost
• AutoDirection Enables Driver Automatically on
Transmission, Eliminating an Opto or Other
Discrete Means of Isolation
• 8-Pin SO Package
• Robust Protection Features for Telecom, Industrial,
and Isolated Applications
• Hot-Swap Capability to Eliminate False Transitions
on the Bus During Power-Up or Live Insertion
• Extended ESD Protection for RS-485 I/O Pins
(±15kV Human Body Model)
• Options Optimize Designs for Speed or Errorless
Data Transmission
• Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission (MAX13487E)
• High-Speed Version (MAX13488E) Allows for
Transmission Speeds Up to 16Mbps
• 1/4-Unit Load, Allowing Up to 128 Transceivers on
the Bus
Functional Diagram
1 RO
2 RE
MAX13487E
MAX13488E
3 SHDN
RI STATE
MACHINE
DI
4
DI
+
R
-
RE
VCC 8
-
COM
+
VDT
B7
A6
DE
D
5
GND
Pin Configuration/Typical Application Circuit appear at end
of data sheet.
19-0740; Rev 1; 2/15
1 page  
MAX13487E/MAX13488E
Half-Duplex RS-485-/RS-422-
Compatible Transceiver with
AutoDirection Control
Switching Characteristics—MAX13488E (continued)
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Receiver Enable from Shutdown
to Output Low
Receiver Enable Delay
Time to Shutdown
tRZL
(SHDN)
tRED
tSHDN
Figure 8
Figure 3
2200
ns
70 ns
50 340 700 ns
Note 1: 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 2: This is a differential voltage from A to B that the driving device must see on the bus to disable its driver.
Note 3: The short-circuit output current applied to peak current just prior to foldback current limiting. The short-circuit foldback out-
put current applies during current limiting to allow a recovery from bus contention.
Typical Operating Characteristics
(VCC = +5.0V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
4.0
NO LOAD
3.8
OUTPUT CURRENT
vs. RECEIVER OUTPUT-HIGH VOLTAGE
35
28
3.6 21
3.4 14
3.2 7
3.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
0
012345
OUTPUT-HIGH VOLTAGE (V)
RECEIVER OUTPUT-HIGH VOLTAGE
vs. TEMPERATURE
5.4
IO = 1mA
5.2
5.0
4.8
4.6
4.4
4.2
4.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
RECEIVER OUTPUT-LOW
VOLTAGE vs. TEMPERATURE
0.5
IO = 1mA
0.4
0.3
0.2
0.1
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
www.maximintegrated.com
OUTPUT CURRENT
vs. RECEIVER OUTPUT-LOW VOLTAGE
60
50
40
30
20
10
0
012345
OUTPUT-LOW VOLTAGE (V)
DIFFERENTIAL OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
80
60
40
20
0
012345
OUTPUT VOLTAGE (V)
Maxim Integrated | 5
5 Page 
MAX13487E/MAX13488E
Half-Duplex RS-485-/RS-422-
Compatible Transceiver with
AutoDirection Control
Pin Description
PIN NAME
FUNCTION
1 RO Receiver Output. When receiver is enabled and V(A) - V(B) > +200mV, RO is high. If V(A) - V(B)
< -200mV, RO is low.
2
RE
Receiver Output Enable. Drive RE low to enable the RO. Drive RE high to let the AutoDirection circuit
control the receiver. RE is a hot-swap input (see the Hot-Swap Capability section for more details).
3
SHDN
Shutdown. Drive SHDN high to let the device operate in normal operation. Drive SHDN low to put the part
in shutdown.
Driver Input. Drive DI low to force noninverting output low and inverting output high. Drive DI high to force
4
DI
noninverting output high and inverting output low. DI is an input to the internal state machine that
automatically enables and disables the driver. See the Function Tables and General Description for more
information. DI is a hot-swap input (see the Hot-Swap Capability section for more details).
5
GND
Ground
6 A Noninverting Receiver Input and Noninverting Driver Output
7 B Inverting Receiver Input and Inverting Driver Output
8 VCC Positive Supply, VCC = +5V ±5%. Bypass VCC to GND with a 0.1µF capacitor.
Function Tables
SHDN
1
1
1
1
0
DI
0
1
1
1
X
INPUTS
A-B > VDT
X
False
False
True
X
TRANSMITTING
ACTION
Turn driver ON
If driver was OFF, keep it OFF
If driver was ON, keep it ON
Turn driver OFF
X
OUTPUTS
AB
01
HIGH IMPEDANCE
HIGH IMPEDANCE
10
HIGH IMPEDANCE
HIGH IMPEDANCE
SHUTDOWN
RECEIVING
SHDN
1
INPUTS
RE A-B DRIVER STATE
0 ≥+200mV
X
RECEIVER STATE
ON
1 0 ≤-200mV
11X
X
ON
ON
OFF
1 1 ≥+200mV
1 1 ≤-200mV
OFF
OFF
ON
ON
0XX
X
X
X = Don’t care, shutdown mode, driver, and receiver outputs are in high impedance.
OUTPUT
RO
1
0
HIGH IMPEDANCE
1
0
SHUTDOWN
www.maximintegrated.com
Maxim Integrated | 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX13488E.PDF ] | |
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