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LTC2906IDDB Datasheet(PDF) 8 Page - Linear Technology |
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LTC2906IDDB Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  LTC2906/LTC2907 8 29067f APPLICATIO S I FOR ATIO Supply Monitoring The LTC2906/LTC2907 are low power, high accuracy dual supply monitoring circuits with an adjustable input and another input with selectable threshold. Reset delay is set to a nominal of 200ms for LTC2906 and is adjustable using an external capacitor for LTC2907. The three-state input pin (S1) selects one of three possible threshold voltage levels for V1. Another three-state input pin sets the supply tolerance (5%, 7.5% or 10%). Both input voltages (V1 and VADJ) must be above predeter- mined thresholds for the reset not to be invoked. The LTC2906/LTC2907 assert the reset outputs during power- up, power-down and brownout conditions on any one of the voltage inputs. Power-Up The greater of V1, VCC is the internal supply voltage (VMAX). VMAX powers the drive circuits for the RST pin. Therefore, as soon as V1 or VCC reaches 1V during power up, the RST output asserts low. VMAX also powers the drive circuits for the RST pin in the LTC2906. Therefore, RST weakly pulls high when either V1 or VCC reaches at least 1V. Threshold programming is complete, when V1 reaches at least 2.17V. After programming, if any one of the Vx inputs TI I G DIAGRA VX RST RST tUV tRST 1V 1V VRTX 29067 TD Vx Monitor Timing falls below its programmed threshold, RST asserts low (RST weakly pulls high) as long as VMAX is at least 1V. Once both V1 and VADJ inputs rise above their thresholds, an internal timer is started. After the programmed delay time, RST weakly pulls high (RST asserts low). Power-Down On power-down, once either V1 or VADJ drops below its threshold, RST asserts logic low and RST weakly pulls high. VMAX of at least 1V guarantees a logic low of 0.4V at RST. Auxiliary Power If an auxiliary power is available it can be connected to the VCC pin. Since the internal supply voltage (VMAX) is the greater of V1, VCC; a VCC of at least 1V guarantees logic low of 0.4V at RST for voltage inputs (V1 and/or VADJ) down to 0V. Programming Pins The two three-state input pins, S1 and TOL, should be connected to GND, V1 or left unconnected during normal operation. Note that when left unconnected, the maximum leakage current allowable from the pin to either GND or V1 is 10 µA. |
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