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ISL83385ECA Datasheet(PDF) 5 Page - Intersil Corporation |
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ISL83385ECA Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 11 page 5 Detailed Description The ISL83385E 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 transmitters, and the receivers. Charge-Pump Intersil’s new ISL83385E 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 over the full VCC range; other capacitor combinations can be used as shown in Table 3. 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. All transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode (see Table 2). These outputs may be driven to ±12V when disabled. All devices guarantee a 250kbps data rate for full load conditions (3k Ω and 1000pF), VCC ≥ 3.0V, with one transmitter operating at full speed. Under more typical conditions of VCC ≥ 3.3V, RL =3kΩ, and CL = 250pF, one transmitter easily operates at 900kbps. Transmitter inputs float if left unconnected (there are no pull- up resistors), and may cause ICC increases. Connect unused inputs to GND for the best performance. Receivers The ISL83385E contains standard inverting receivers that convert RS-232 signals to CMOS output levels and accept inputs up to ±30V while presenting the required 3kΩ to 7kΩ input impedance (see Figure 1) even if the power is off Output Leakage Current VOUT = ±12V, VCC = 0V or 3V to 5.5V, SHDN = GND Full - - ±25 µA TIMING CHARACTERISTICS Maximum Data Rate RL =3kΩ, CL = 1000pF, One Transmitter Switching Full 250 500 - kbps Receiver Propagation Delay Receiver Input to Receiver Output, CL = 150pF tPHL 25 - 0.15 - µs tPLH 25 - 0.15 - µs Transmitter Output Enable Time From SHDN Rising Edge to TOUT = ±3.7V 25 - 100 - µs Transmitter Skew tPHL - tPLH (Note 4) 25 - 100 - ns Receiver Skew tPHL - tPLH 25 - 50 - ns Transition Region Slew Rate RL =3kΩ to 7kΩ, Measured From 3V to -3V or -3V to 3V, VCC = 3.3V CL = 150pF to 1000pF 25 6 - 30 V/ µs CL = 150pF to 2500pF 25 4 - 30 V/ µs ESD PERFORMANCE RS-232 Pins (TOUT, RIN) Human Body Model 25 - ±15 - kV IEC1000-4-2 Air Gap Discharge 25 - ±15 - kV IEC1000-4-2 Contact Discharge 25 - ±8- kV All Other Pins Human Body Model 25 - ±3- kV NOTE: 4. 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 oC (Continued) PARAMETER TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS TABLE 2. POWERDOWN TRUTH TABLE SHDN INPUT TRANSMITTER OUTPUTS RECEIVER OUTPUTS MODE OF OPERATION H Active Active Normal Operation L High-Z Active Manual Powerdown ISL83385E |
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