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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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ISL32614EFHZ-T Fiches technique(PDF) 7 Page - Intersil Corporation |
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ISL32614EFHZ-T Fiches technique(HTML) 7 Page - Intersil Corporation |
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7 / 11 page  ISL32613E, ISL32614E 7 FN7906.0 August 30, 2011 Application Information Driver Features These transmitters are differential output devices that operate with VCC as low as 1.8V, and up to 3.6V. Devices are RS-485 compliant with VCC ≥ 3V, but significant power savings are obtained by operating at VCC = 1.8V. The transmitter outputs are tri-statable via the active high DE input. If the Tx enable function is not needed, tie DE to VCC through a 1kΩ to 2kΩ resistor. Outputs are slew rate limited to minimize EMI, and to reduce reflections in unterminated or improperly terminated networks. 1.8V Operation The ISL32613E and ISL32614E operate with VCC as low as 1.8V. When coupled with the ISL32610E or ISL32611E 1.8V receivers, they provide a differential communication link optimized for very low power, and for slow data rates. Figures 7 and 8 illustrate the static and dynamic power savings from using these transmitters at low supply voltages. With VCC = 1.8V rather than 3.3V, using the ISL32613E at 128kbps reduces the operating supply current from 9.9mA to 56µA (a factor of 177)! 5.5V Tolerant Logic Pins Logic input pins (DI, DE) contain no ESD or parasitic diodes to VCC, so they withstand input voltages exceeding 5.5V, regardless of the VCC voltage. Hot Plug Function When a piece of equipment powers up, there is a period of time during which the processor or ASIC driving the RS-485 control line (DE) is unable to ensure that the RS-485 Tx outputs are kept disabled. If the equipment is connected to the bus, a driver activating prematurely during power-up may crash the bus. To avoid this scenario, these transmitters incorporate a “Hot Plug” function. During power-up, circuitry monitoring VCC ensures that the Tx outputs remain disabled for a period of time, regardless of the state of DE. This gives the processor/ASIC a chance to stabilize and drive the control lines to the proper states. ESD Protection All pins on these devices include class 3 (8kV) Human Body Model (HBM) ESD protection structures, but the driver outputs incorporate advanced structures that allow them to survive ESD events in excess of ±16.5kV HBM and ±7kV to the IEC61000 contact test method. The RS-485 pins are particularly vulnerable to ESD damage because they typically connect to an exposed port on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can cause an ESD event that might destroy unprotected ICs. These new ESD structures protect the device whether it is powered up or not, and without degrading the common mode range. This built-in ESD protection eliminates the need for board-level protection structures (e.g., transient suppression diodes) and the associated, undesirable capacitive load they present. Driver Overload Protection The driver output stages incorporate short-circuit, current-limiting circuitry, which ensures that the output current never exceeds the RS-485 specification over a ±2V (-7V to +12V for VCC ≥ 2.7V) common mode voltage range. In the event of a major short-circuit condition, the device also includes a thermal shutdown feature that disables the drivers whenever the die temperature becomes excessive. This eliminates power dissipation, allowing the die to cool. The drivers automatically re-enable after the die temperature drops by about +20°C. If the condition persists, the thermal shutdown/re-enable cycle repeats until the fault is cleared. Low Power Shutdown Mode This BiCMOS transmitter uses a fraction of the power required by its bipolar counterparts, but it also includes a shutdown feature that reduces the already low quiescent ICC to a 10nA trickle. This device enters shutdown whenever the driver disables (DE = GND). |
Numéro de pièce similaire - ISL32614EFHZ-T |
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Description similaire - ISL32614EFHZ-T |
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