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ISL83220ECV Datasheet(PDF) 5 Page - Intersil Corporation |
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ISL83220ECV Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 10 page 5 Detailed Description The ISL83220E operates from a single +3V to +5.5V supply, guarantees a 250kbps minimum data rate, requires only four small external 0.1 μF capacitors, features low power consumption, and meets all ElA RS-232C and V.28 specifications. The circuit is divided into three sections: The charge pump, the transmitter, and the receiver. Charge-Pump Intersil’s new 3.3V family utilizes regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate ±5.5V transmitter supplies from a VCC supply as low as 3.0V. This allows these devices to maintain RS-232 compliant output levels over the ±10% tolerance range of 3.3V powered systems. The efficient on-chip power supplies require only four small, external 0.1 μF capacitors for the voltage doubler and inverter functions, even at VCC = 3.3V. The charge pumps operate discontinuously (i.e., they turn off as soon as the V+ and V- supplies are pumped up to the nominal values), resulting in significant power savings. Transmitters The transmitters are proprietary, low dropout, inverting drivers that translate TTL/CMOS inputs to EIA/TIA-232 output levels. Coupled with the on-chip ±5.5V supplies, these transmitters deliver true RS-232 levels over a wide range of single supply system voltages. The transmitter output disables and assumes a high impedance state when the device enters the powerdown mode (see Table 2). This output may be driven to ±12V when disabled. All devices guarantee a 250kbps data rate for full load conditions (3k Ω and 1000pF), V CC ≥ 3.0V. Under more typical conditions of VCC ≥ 3.3V, RL = 3kΩ, and CL = 250pF, the ISL83220E easily operates at 900kbps. Transmitter inputs float if left unconnected, and may cause ICC increases. Receivers The ISL83220E device contains a standard inverting receiver that three-states via the EN control line. Receivers convert RS-232 signals to CMOS output levels and accept inputs up to ±25V while presenting the required 3kΩ to 7kΩ input impedance (see Figure 1) even if the power is off (VCC = 0V). The receiver’s Schmitt trigger input stage uses hysteresis to increase noise immunity and decrease errors due to slow input signal transitions. TIMING CHARACTERISTICS Maximum Data Rate RL = 3kΩ, CL = 1000pF, One Transmitter Switching Full 250 500 - kbps Transmitter Propagation Delay Transmitter Input to Transmitter Output, RL = 3kΩ, CL = 1000pF tPHL 25 - 1.0 - μs tPLH 25 - 1.0 - μs Receiver Propagation Delay Receiver Input to Receiver Output, CL = 150pF tPHL 25 - 0.20 - μs tPLH 25 - 0.30 - μs Receiver Output Enable Time Normal Operation 25 - 200 - ns Receiver Output Disable Time Normal Operation 25 - 200 - ns Transmitter Skew tPHL - tPLH (Note 2) 25 - 100 500 ns Receiver Skew tPHL - tPLH Full - 100 1000 ns Transition Region Slew Rate VCC = 3.3V, RL = 3kΩ to 7kΩ, Measured From 3V to -3V or -3V to 3V CL = 150pF to 2500pF 25 4 - 30 V/ μs CL = 150pF to 1000pF 25 6 - 30 V/ μs ESD PERFORMANCE RS-232 Pins (TOUT, RIN) Human Body Model 25 - ±15 - kV IEC61000-4-2 Contact Discharge 25 - ±8- kV IEC61000-4-2 Air Gap Discharge 25 - ±15 - kV All Other Pins Human Body Model 25 - ±3- kV NOTE: 2. Transmitter skew is measured at the transmitter zero crossing points. Electrical Specifications Test Conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1μF; Unless Otherwise Specified. Typicals are at TA = 25°C (Continued) PARAMETER TEST CONDITIONS TEMP (°C) MIN TYP MAX UNITS ISL83220E |
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