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PDF ISL3298EMRTEP Data sheet ( Hoja de datos )
| Número de pieza | ISL3298EMRTEP | |
| Descripción | Low Power RS-485/RS-422 Transmitter | |
| Fabricantes | Intersil | |
| Logotipo |  |
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16kV ESD Protected, +125°C, 3.0V to 5.5V, TDFN
Packaged, Low Power RS-485/RS-422 Transmitter
ISL3298EMRTEP
The Intersil ISL3298EMRTEP is a ±16.5kV HBM ESD Protected
(7kV IEC61000 contact), 3.0V to 5.5V powered, single
transmitter for balanced communication using the RS-485 and
RS-422 standards. This driver has very low bus currents (±40mA),
so it presents less than a “1/8 unit load” to the RS-485 bus. This
allows more than 256 transmitters on the network without
violating the RS-485 specification’s 32 unit load maximum, and
without using repeaters.
Hot Plug circuitry ensures that the Tx outputs remain in a high
impedance state while the power supply stabilizes.
The driver on the ISL3298EMRTEP is not limited, so it can achieve a
16Mbps data rate and is offered in the -55°C to +125°C
temperature range.
This devices also feature a logic supply pin (VL) that sets the
switching points of the DE and DI inputs to be compatible with a
lower supply voltage in mixed voltage systems.
For a companion single RS-485 receiver in micro packages,
please see the ISL3282EMRTEP data sheet.
Applications
• Clock Distribution
• High Node Count Systems
• Space Constrained Systems
• Security Camera Networks
• Building Environmental Control/Lighting Systems
• Industrial/Process Control Networks
Features
• Specifications per DLA VID V62/10602
• Full Mil-Temp Electrical Performance from -55°C to +125°C
• Controlled Baseline with One Wafer Fabrication Site and One
Assembly/Test Site
• Full Homogeneous Lot Processing in Wafer Fab
• No Combination of Wafer Fabrication Lots in Assembly
• Full Traceability Through Assembly and Test by Date/Trace
Code Assignment
• Enhanced Process Change Notification
• Enhanced Obsolescence Management
• Eliminates Need for Up-Screening a COTS Component
• High ESD Protection on RS-485 Outputs . . . . ±16.5kV HBM
- IEC61000-4-2 Contact Test Method. . . . . . . . . . . . . . . ±7kV
- Class 3 ESD Level on all Other Pins. . . . . . . . . . .>8kV HBM
• Specified for +125°C Operation (VCC ≤ 3.6V Only)
• Logic Supply Pin (VL) Eases Operation in Mixed Supply Systems
• Hot Plug - Tx Output Remains Three-state During Power-up
• Low Tx Leakage Allows >256 Devices on the Bus
• High Data Rates . . . . . . . . . . . . . . . . . . . . . . . . . up to 16Mbps
• Low Quiescent Supply Current . . . . . . . . . . . . . . .150µA (Max)
- Very Low Shutdown Supply Current . . . . . . . . . . 1µA (Max)
• -7V to +12V Common Mode Output Voltage Range (VCC ≤ 3.6V
Only)
• Current Limiting and Thermal Shutdown for Driver Overload
Protection (VCC ≤ 3.6V Only)
• Tri-statable Tx Output
• 5V Tolerant Logic Input When VCC ≤5V
PART
NUMBER
ISL3298EMRTEP
FUNCTION
1 Tx
DATA RATE
(Mbps)
16
TABLE 1. SUMMARY OF FEATURES
SLEW-RATE
LIMITED?
NO
HOT
PLUG?
YES
VL
PIN?
YES
TX
ENABLE?
YES
MAXIMUM
QUIESCENT ICC
(µA)
150
LOW POWER
SHUTDOWN?
YES
PIN
COUNT
8-TDFN
July 28, 2011
FN7607.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2010, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL3298EMRTEP
Applications Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transmitters and receivers are also RS-422 compliant. RS-422 is
a point-to-multipoint (multidrop) standard, which allows only one
driver and up to 10 (assuming one unit load devices) receivers on
each bus. RS-485 is a true multipoint standard, which allows up
to 32 one unit load devices (any combination of drivers and
receivers) on each bus. To allow for multipoint operation, the
RS-485 specification requires that drivers must handle bus
contention without sustaining any damage.
Another important advantage of RS-485 is the extended common
mode range (CMR), which specifies that the driver outputs and
receiver inputs withstand signals that range from +12V to -7V.
RS-422 and RS-485 are intended for runs as long as 4000’, so the
wide CMR is necessary to handle ground potential differences, as
well as voltages induced in the cable by external fields.
Driver Features
This RS-485/RS-422 driver is a differential output device that
delivers at least 1.5V across a 54Ω load (RS-485), and at least 2V
across a 100Ω load (RS-422). The drivers feature low propagation
delay skew to maximize bit width, and to minimize EMI.
The driver is tri-statable via the active high DE input. If the Tx
enable function isn’t needed, tie DE to VCC (or VL) through a 1kΩ
to 3kΩ resistor.
The ISL3298EMRTEP’s output transition times allow data rates
of at least 16Mbps.
Wide Supply Range
The ISL3298EMRTEP is optimized for 3.3V operation, but can
be operated with supply voltages as high as 5.5V. This device
meets the RS-422 and RS-485 specifications for supply
voltages less than 4V, and is RS-422 and RS-485 compatible
for supplies greater than 4V. Operation at +125°C requires VCC
≤ 3.6V, while 5V operation requires adding output current
limiting resistors (as described in the “Driver Overload
Protection” on page 6) if output short circuits (e.g., from bus
contention) are a possibility.
5.5V Tolerant Logic Pins
Logic input pins (DI, DE) contain no ESD nor parasitic diodes to
VCC (nor to VL), so they withstand input voltages exceeding 5.5V
regardless of the VCC and VL voltages (see Figure 5).
VCC = +3.3V
VCC = +2V
GND
VIH ≥ 2V
DI
TXD
VOH ≤ 2V
VIH ≥ 2V
DE
DEN
VOH ≤ 2V
GND
ISL3293E
VCC = +3.3V
UART/PROCESSOR
VCC = +2V
GND
VL
DI VIH = 1.4V
TXD
VOH ≤ 2V
VIH = 1.4V
DE DEN
VOH ≤ 2V
GND
ISL3296E
UART/PROCESSOR
FIGURE 5. USING VL PIN TO ADJUST LOGIC LEVELS
Logic Supply (VL Pin)
Note: Power-up VCC before powering up the VL supply.
The ISL3298EMRTEP includes a VL pin that powers the logic
inputs (DI and DE). These pins interface with “logic” devices such
as UARTs, ASICs, and µcontrollers, and today most of these
devices use power supplies significantly lower than 3.3V. Thus,
the logic device’s low VOH might not exceed the VIH of a 3.3V or
5V powered DI or DE input. Connecting the VL pin to the power
supply of the logic device (as shown in Figure 5) reduces the DI
and DE input switching points to values compatible with the logic
device’s output levels. Tailoring the logic pin input switching
points and output levels to the supply voltage of the UART, ASIC,
or µcontroller eliminates the need for a level shifter/translator
between the two ICs.
VL can be anywhere from VCC down to 1.35V, but the input
switching points may not provide enough noise margin, and
16Mbps data rates may not be achievable, when VL < 1.5V. The
E.C. table in the SMD indicates typical VIH and VIL values for
various VL settings so the user can ascertain whether or not a
particular VL voltage meets his/her needs.
The VL supply current (IL) is typically much less than 20µA, as
shown in Figure 9, when DE and DI are above/below VIH/VIL.
5 FN7607.1
July 28, 2011
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ISL3298EMRTEP.PDF ] | |
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