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LTC2905CDDBTRMPBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC2905CDDBTRMPBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LTC2904/LTC2905 9 29045fd APPLICATIONS INFORMATION VX RST RST tUV tRST 1V 1V VRTX 29045 TD VX Monitor Timing TIMING DIAGRAM Supply Monitoring The LTC2904/LTC2905 are low power, high accuracy dual supply monitors with a common reset output and selectable thresholds. Reset delay is set to a nominal of 200ms for the LTC2904 and is adjustable using an external capacitor for the LTC2905. The two 3-state input pins (S1 and S2) select one of nine possible threshold voltage combinations. Another three- state input pin sets the supply tolerance (5%, 7.5% or 10%). Both input voltages (V1 and V2) must be above predetermined thresholds for the reset not to be invoked. The LTC2904/LTC2905 assert the reset outputs during power-up, power-down and brownout conditions on either of the voltage inputs. Power-Up The greater of V1, V2 is the internal supply voltage (VCC). VCC powers the drive circuits for the RST pin. Therefore as soon as V1 or V2 reaches 1V during power-up, the RST output asserts low. VCC also powers the drive circuits for the RST pin in the LTC2904. Therefore, RST weakly pulls high when V1 or V2 reaches at least 1V. Threshold programming is complete when V1 reaches at least 2.17V. After programming, if either V1 or V2 falls below its programmed threshold, RST asserts low (RST weakly pulls high) as long as VCC is at least 1V. Once V1 and V2 rise above their thresholds, an internal timer is started. After the programmed delay time, RST weakly pulls high (RST asserts low). |
Similar Part No. - LTC2905CDDBTRMPBF |
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Similar Description - LTC2905CDDBTRMPBF |
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