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LTC1326 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1326 Datasheet(HTML) 5 Page - Linear Technology |
5 / 16 page LTC2917/LTC2918 5 29178f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Reset Output (⎯R⎯S⎯T) tRST(INT) Internal Reset Timeout Period VRT = VCC ● 150 200 260 ms tRST(EXT) Adjustable Reset Timeout Period CRT = 2.2nF ● 16 20 25 ms tUV VM Undervoltage Detect to ⎯R⎯S⎯T Asserted VM Less Than Reset Threshold VMTX by More Than 5% ● 10 80 150 μs VOL Output Voltage Low ⎯R⎯S⎯TVCC = 3.3V, IRST = 2.5mA VCC = 1V, IRST = 100μA VCC = 0.8V, IRST = 15μA ● ● ● 0.15 0.15 0.05 0.4 0.3 0.2 V V V IOH(RST) ⎯R⎯S⎯T Output Voltage High Leakage ⎯R⎯S⎯T = VCC ● ±1 μA Watchdog Timer Control (WT) IWT(UP) WT Pull Up Current VWT = 0.25V ● –2 –3 –4 μA IWT(DOWN) WT Pull Down Current VWT = 1.1V ● 234 μA VWT(INT, LH) WT Internal Timer Threshold VWT Rising, Referenced to VCC ● –100 –160 –300 mV IWT(INT) Internal WT VCC Detect Current VWT = VCC ● 18 μA IWT(DIS) Watchdog Disable Hold Current VWT = 0V –3.5 μA Watchdog Input (WDI) tWDU(INT) Internal Watchdog Upper Boundary VWT = VCC ● 1.3 1.6 2 s tWDL(INT) Internal Watchdog Lower Boundary (Note 5) B Versions, VWT = VCC ● 37.5 50 62.5 ms tWDU(EXT) External Watchdog Upper Boundary CWT = 2.2nF ● 130 160 200 ms tWDL(EXT) External Watchdog Lower Boundary (Note 5) B Versions, CWT = 2.2nF ● tWDU(EXT)/32 ms VIL(WDI) Input Low Voltage ● 0.4 V VIH(WDI) Input High Voltage ● 1.1 V tPW(WDI) Input Pulsewidth ● 400 ns WDI Leakage Current ● ±1 μA Manual Reset Input (LTC2918) VIL(MR) Input Low Voltage ● 0.2 • VCC V VIH(MR) Input High Voltage ● 0.8 • VCC V RPU Pull Up Resistance ● 50 100 150 kΩ tPW(MR) Pulsewidth ● 250 ns Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All currents into pins are positive; all voltages are referenced to GND unless otherwise noted. Note 3: VCC maximum pin voltage is limited by input current. Since the VCC pin has an internal 6.2V shunt regulator, a low impedance supply which exceeds 5.7V may exceed the rated terminal current. Operation ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.5V, unless otherwise noted. (Note 2) from higher voltage supplies requires a series dropping resistor. See Applications Information. Note 4: Input impedance is dependent on the configuration of the SEL pins. Note 5: In the LTC2917-B/LTC2918-B, edges must occur on WDI with a period between the lower and upper boundary or ⎯R⎯S⎯T is invoked. For the LTC2917-A/LTC2918-A, the edges must simply occur before the upper boundary. See Applications Information. |
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Similar Description - LTC1326 |
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