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LTC1728-5 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1728-5 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page 3 LTC2903-1 29031f a SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IV1 V1 Input Current (Note 4) V1 = 3.3V (LTC2903-A1, LTC2903-D1) ● 20 80 µA V1 = 5V (LTC2903-B1, LTC2903-C1, ● 25 80 µA LTC2903-E1) IV2 V2 Input Current (Note 4) V2 = 2.5V (LTC2903-A1) ● 830 µA V2 = 3.3V (LTC2903-B1, LTC2903-C1) ● 10 30 µA V2 = 0.55V (LTC2903-D1, LTC2903-E1) ● ±30 nA IV3 V3 Input Current V3 = 1.8V (LTC2903-A1, LTC2903-C1) ● 830 µA V3 = 2.5V (LTC2903-B1) ● 10 30 µA V3 = 0.55V (LTC2903-D1, LTC2903-E1) ● ±30 nA IV4 V4 Input Current V4 = 0.55V (LTC2903-A1) ● ±30 nA V4 = 1.8V (LTC2903-B1) ● 24 µA V4 = –5.2V (LTC2903-C1) ● –3 –6 µA V4 = 0.55V (LTC2903-D1, LTC2903-E1) ● ±30 nA tRST Reset Time-Out Period ● 140 200 260 ms tUV VX Undervoltage Detect to RST VX Less Than Threshold VRTX by 150 µs More Than 1% VOH Output Voltage High RST (LTC2903-1) (Note 5) IRST(DN) = –1µA (LTC2903-A1, ● V2 – 1 V LTC2903-B1, LTC2903-C1) (LTC2903-D1, LTC2903-E1) ● V1 – 1 V VOL Output Voltage Low RST (Note 6) VCC = 0.2V, IRST = 0.1µA ● 560 mV VCC = 0.5V, IRST = 5µA ● 10 150 mV VCC = 1V, IRST = 200µA ● 25 300 mV VCC = 3V, IRST = 2500µA ● 100 300 mV The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V unless otherwise noted. Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: All currents into pins are positive, all voltages are referenced to GND unless otherwise noted. Note 3: The internal supply voltage (VCC) is generated from the greater voltage on the V1 and V2 inputs. VCC = V1 for options D1 and E1. Note 4: Under typical operating conditions, quiescent current is drawn from the V1 input. When V2 exceeds V1, V2 supplies the quiescent current. V1 only for options D1 and E1. Note 5: The RST output pin on the LTC2903-1 has an internal pull-up to V2 (for options A1, B1 and C1) of typically 10µA. However, for faster rise times or for VOH voltages greater than V2, use an external pull-up resistor. The internal pull-up is connected to V1 for options D1 and E1. Note 6: For options A1, B1 and C1, the RST pulldown current is derived from V1, V2 and V3. For options D1 and E1, pulldown strength is derived from V1. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VRT33 3.3V, 5% Reset Threshold V1 Input Threshold ● 3.036 3.086 3.135 V VRTAV2 V2 Adjustable Threshold V2 Input Threshold ● 0.492 0.500 0.508 V VRTAV3 V3 Adjustable Threshold V3 Input Threshold ● 0.492 0.500 0.508 V VRTAV4 V4 Adjustable Threshold V4 Input Threshold ● 0.492 0.500 0.508 V (LTC2903-D1) The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V unless otherwise noted. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VRT50 5V, 5% Reset Threshold V1 Input Threshold ● 4.600 4.675 4.750 V VRTAV2 V2 Adjustable Threshold V2 Input Threshold ● 0.492 0.500 0.508 V VRTAV3 V3 Adjustable Threshold V3 Input Threshold ● 0.492 0.500 0.508 V VRTAV4 V4 Adjustable Threshold V4 Input Threshold ● 0.492 0.500 0.508 V (LTC2903-E1) The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise noted. |
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