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ICL3207CA Datasheet(PDF) 5 Page - Intersil Corporation |
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ICL3207CA Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 11 page 5 Detailed Description The ICL32X7 interface ICs operate from a single +3V to +5.5V power supply, guarantee a 250kbps minimum data rate, require only four small external 0.1 µF capacitors, feature low power consumption, and meet 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 ICL32XX family utilizes regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate ±5.5V transmitter supplies from a V CC 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 at VCC = 3.3V. See the “Capacitor Selection” section, and Table 3 for capacitor recommendations for other operating conditions. 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. ICL3217 transmitter outputs disable and assume a high impedance state when the device enters the automatic powerdown mode. These outputs may be driven to ±12V when disabled. Both 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 800kbps. Transmitter inputs float if left unconnected, and may cause ICC increases. Connect unused inputs to GND for the best performance. Input Hysteresis 25 - 0.3 - V Input Resistance 25 357 k Ω TRANSMITTER OUTPUTS Output Voltage Swing All Transmitter Outputs Loaded with 3k Ω to Ground Full ±5.0 ±5.4 - V Output Resistance VCC = V+ = V- = 0V, Transmitter Output = ±2V Full 300 10M - Ω Output Short-Circuit Current Full - ±35 ±60 mA Output Leakage Current (ICL3217 Only) VOUT = ±12V, VCC = 0V or 3V to 5.5V In Automatic Powerdown Full - - ±25 µA TIMING CHARACTERISTICS Maximum Data Rate (One Transmitter Switching) VCC = 3.15V, C1 - C4 = 0.1µF, RL = 3kΩ, CL = 1000pF Full 250 500 - kbps VCC = 3.0V, C1 - C4 = 0.22µF, RL = 3kΩ, CL = 1000pF Full 250 286 - kbps VCC ≥ 4.5V, C1 - C4 = 0.1µF, RL = 3kΩ, CL = 1000pF Full 250 310 - kbps Receiver Propagation Delay Receiver Input to Receiver Output, CL = 150pF tPHL 25 - 0.3 - µs tPLH 25 - 0.3 - µs Transmitter Skew tPHL - tPLH Full - 200 1000 ns Receiver Skew tPHL - tPLH Full - 100 500 ns Transition Region Slew Rate VCC = 3.3V, RL =3kΩ to 7kΩ, Measured From +3V to -3V or -3V to +3V CL = 200pF to 2500pF 25 4 15 30 V/ µs CL = 200pF to 1000pF 25 6 15 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 - ±6- kV All Other Pins Human Body Model 25 - ±2- kV 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 ICL3207, ICL3217 |
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Similar Description - ICL3207CA |
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