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ISL4238EIR-T 데이터시트(PDF) 8 Page - Intersil Corporation |
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ISL4238EIR-T 데이터시트(HTML) 8 Page - Intersil Corporation |
8 / 17 page 8 Detailed Description These interface ICs operate from a single +2.7V to +5.5V supply, guarantee a 250kbps (ISL4238E/44E) / 1Mbps (ISL4245E) 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 RS-232 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. 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. 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. The ISL4238E/44E 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 1Mbps. The ISL4245E guarantees a 1Mbps data rate for full load conditions (3k Ω and 250pF), 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 1.4Mbps. Receiver Output Enable Time Normal Operation, RL = 1kΩ to 0.5VCC, CL = 15pF 25 - 200 350 ns Full - 200 400 ns Receiver Output Disable Time Normal Operation, RL = 1kΩ to 0.5VCC, CL = 15pF 25 - 350 500 ns Full - 400 600 ns Transmitter Output Enable Time ISL4238E/44E/45E Normal Operation, RL = 3kΩ, CL = 1000pF 25 - 25 40 µs Full - 35 50 µs Transmitter Output Disable Time ISL4238E/44E/45E Normal Operation, RL = 3kΩ, CL = 1000pF 25 - 2.5 4 µs Full - 2.7 4 µs Transition Region Slew Rate ISL4238E/44E VCC = 3V to 3.6V, RL =3kΩ to 7kΩ, Measured From 3V to -3V or -3V to 3V CL = 150pF to 1000pF 25 6 11 30 V/ µs Full 6 10 30 V/ µs CL = 150pF to 2500pF 25 4 9 30 V/ µs Full 4 8 30 V/ µs Transition Region Slew Rate ISL4245E VCC = 3V to 3.6V, RL = 3kΩ to 7kΩ, Measured From 3V to -3V or -3V to 3V, CL = 150pF to 1000pF 25 24 40 150 V/ µs Full 24 35 150 V/ µs ESD PERFORMANCE RS-232 Pins (TOUT, RIN) Human Body Model 25 - ±15 - kV IEC6100-4-2 Air Gap Discharge 25 - ±15 - kV IEC6100-4-2 Contact Discharge 25 - ±8- kV All Other Pins Human Body Model 25 - ±3- kV NOTES: 4. ISL4238E inputs utilize a positive feedback resistor. The input current is negligible when the input is at either supply rail. 5. An “edge” is defined as a transition through the transmitter or receiver input thresholds. 6. Skew is measured at the receiver input switching points (1.4V). 7. Skew is measured at the transmitter zero crossing points. Electrical Specifications Test Conditions: ISL4238E VCC = 3.15V to 5.5V, C1 - C4 = 0.1µF; VCC = 3V, C1 - C4 = 0.22µF; ISL424XE VCC = 3V to 5.5V, C1 - C4 = 0.1µF; Unless Otherwise Specified. Typicals are at TA = 25 oC PARAMETER TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS ISL4238E, ISL4244E, ISL4245E |
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