MAX14781E Datasheet PDF - Maxim Integrated
| Part Number | MAX14781E | |
| Description | Half-Duplex RS-485 Transceiver | |
| Manufacturers | Maxim Integrated | |
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MAX14781E
Half-Duplex RS-485 Transceiver
with Polarity Correction
General Description
The MAX14781E +5V, half-duplex ±25kV ESD-protected
RS-485 transceiver features integrated automatic polar-
ity correction to ensure that miswired A and B lines are
autonomously corrected, simplifying equipment and net-
work installation.
The MAX14781E includes slew-rate limited drivers that
minimize EMI, allowing for error-free data transmission
up to 370kbps.
This device includes fail-safe circuitry, guaranteeing a
logic-high receiver output when the receiver inputs are
shorted or open. Hot-swap functionality on the receiver
and driver enable inputs also eliminates false transitions
on the bus during power-up or live insertion.
The MAX14781E features a 1/8-unit load receiver input
impedance, allowing up to 256 transceivers on the bus. All
driver outputs are protected up to ±25kV ESD using the
Human Body Model. The MAX14781E is available in an
8-pin SO package and operates over the extended -40°C
to +85°C temperature range.
Applications
●● Power Meter Networks
●● HVAC Networks
●● Control Systems
Benefits and Features
●● Automatic Polarity Correction
●● Integrated Protection Increases Robustness
• High ESD Protection
±25kV HBM ESD
±15kV IEC 61000-4-2 Air Gap Discharge ESD
±9kV IEC 61000-4-2 Contact Discharge ESD
• True Fail-Safe Receiver
• Hot-Swap Functionality
●● +5V Operation
●● Low 10µA (max) Shutdown Current
●● Extended -40°C to +85°C Operating Temperature
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX14781E.related.
Functional Diagram
RO R
RE
DE
DI D
MAX14781E
POLARITY
CORRECT
A
B
19-6859; Rev 0; 12/13
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MAX14781E
Half-Duplex RS-485 Transceiver
with Polarity Correction
Switching Characteristics (continued)
(VCC = 5V ± 10%, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 5V and TA = +25°C.)(Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Receiver Enable to Output Low
tRZL
RL = 1kΩ, CL = 15pF, Figure 8
(Note 9)
50 ns
Receiver Disable Time from Low
tRLZ
RL = 1kΩ, CL = 15pF, Figure 8
(Note 9)
50 ns
Receiver Disable Time from High
tRHZ
RL = 1kΩ, CL = 15pF, Figure 8
(Note 9)
50 ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
RL = 1kΩ, CL = 15pF, Figure 8
(Note 9)
5.5 μs
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
RL = 1kΩ, CL = 15pF, Figure 8
(Note 9)
5.5 μs
Time to Shutdown
tSHDN
(Note 10)
50 340 700
ns
Note 2: All devices are 100% production tested at TA = +25°C. Spefications over temperature are guaranteed by design.
Note 3: All currents into the device are positive. All currents out of the device are negative. All voltages are referenced to ground,
unless otherwise noted.
Note 4: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 5: The short-circuit output current applies to the peak current just prior to foldback current limiting. The short-circuit foldback
output current applies during current limiting to allow recovery from a bus contention.
Note 6: tPM is the interval, with no A/B switching activity, after which the internal logic circuitry records the polarity. tPM includes the
correction delay, after which the polarity is changed.
Note 7: Not production tested. Guaranteed by design.
Note 8: Capacitive loads include test probe and fixture capacitance.
Note 9: This parameter refers to the driver/receiver enable delay when the device has exited the initial hot-swap state and is in nor-
mal operating mode.
Note 10: Shutdown is enabled by driving RE high and DE low. The device is guaranteed to have entered shutdown after tSHDN has
elapsed.
www.maximintegrated.com
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| Information | Total 19 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ MAX14781E.PDF Datasheet ] | |
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