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LTC2917HMS-A1PBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC2917HMS-A1PBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 16 page  LTC2917/LTC2918 7 29178f GND: Device Ground. ⎯M⎯R (LTC2918 only): Manual Reset Input (Active Low). A low level on the ⎯M⎯R input causes the part to issue a reset, which is released one reset timeout after the input goes high. The pin has an internal 100k pull-up to VCC, and thus may interface directly to a momentary pushbutton. Leave open if unused. ⎯R⎯S⎯T: Open Drain ⎯R⎯S⎯T Output. Asserts low when VM is below the threshold selected by SEL1, SEL2 and TOL input pins. Held low for an adjustable timeout after VM input is above threshold. RT: Reset Timeout Control Pin. Attach an external capaci- tor (CRT) to GND to set a reset timeout of 9ms/nF. Leave RT open to generate a reset timeout of approximately 400μs. Tie RT to VCC to generate a reset timeout of ap- proximately 200ms. SEL1, SEL2: Monitor Voltage Select Three-State Input. SEL1, and SEL2 control the nominal threshold voltage that VM is set to monitor. Connect to VCC, GND or leave unconnected in open state. (See Table 1). TOL (LTC2917 only): Three-State Input for Supply Tol- erance Selection (–5%, –10% or –15%). Controls the tolerance band at which the VM supply is monitored. Connect to VCC, GND, or leave unconnected in open state. (See Table 2) VCC: Power Supply input. Bypass this pin to ground with a 0.1μF ceramic capacitor. A minimum of 1.5V on VCC ensures that the part is out of under voltage lockout and that the voltage thresholds are accurate. Operates as a direct supply input for voltages up to 5.5V. Operates as a shunt regulator for supply voltages greater than 5.7V and should have a resistor between this pin and the supply to limit VCC input current to no greater than 5mA. When used without a current-limiting resistor, pin voltage must not exceed 5.7V. VM: Voltage Monitor Input to ⎯R⎯S⎯T comparator. SEL1, SEL2 and TOL inputs select the exact threshold that asserts the ⎯R⎯S⎯T output. WDI: Watchdog Input. This pin must be driven to change state within a time less than the watchdog upper bound- ary time, or ⎯R⎯S⎯T will be asserted low. On the LTC2917-B, LTC2918-B, the period must also be greater than the watchdog lower boundary time, and only falling edges are considered. Tie WT and WDI to GND to disable the watchdog timer. WT: Watchdog Timer Control Pin. Attach an external capacitor (CWT) to GND to set a watchdog upper bound- ary timeout time of 72ms/nF. Tie WT to VCC to generate a timeout of approximately 1.6s. Leave WT open to generate a timeout of approximately 3.2ms. Tie WT and WDI to GND to disable the watchdog timer. Exposed Pad (DFN Only): Exposed pad may be left open or connected to device ground. PIN FUNCTIONS SUPPLY VOLTAGE, VCC (V) 0 0 1 2 3 4 5 6 1234 29178 G10 5 10k PULL-UP R TO VCC SEL1 = SEL2 = TOL = 0V VM = 0.5V SUPPLY VOLTAGE, VCC (V) 0 0 1 2 3 4 5 6 123 4 29178 G11 5 RST AT 150mV RST AT 50mV IRST (mA) 0 0.6 0.8 1.0 8 29178 G12 0.4 0.2 0 2 4 6 10 TA = 125°C TA = 25°C TA = –40°C NO PULL-UP R VCC = 2.5V TYPICAL PERFORMANCE CHARACTERISTICS ⎯R⎯S⎯T Output Voltage vs VCC ⎯R⎯S⎯T Pull-Down Current vs VCC ⎯R⎯S⎯T VOL vs IRST |
Similar Part No. - LTC2917HMS-A1PBF |
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Similar Description - LTC2917HMS-A1PBF |
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