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LTC1536 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1536 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1536 1536fa TI I G DIAGRA S VCC Monitor Timing Pushbutton Reset Function Timing t < tPB tPB tRST tDB tSRST 1536 TD02 PBR RST SRST tRST 1536 TD01 VRTX VCCX RST tFAIL Fast Undervoltage Detect tFAIL 500mV 1536 TD03 VCC3 OR VCC5 VRTX SLEW RATE ≤0.1V/µs RST tPF 300mV 1536 TD04 VCC5 FALL TIME ≤ 10ns, VCC3 = 3.3V RST 3.3V Power-Fail Detect APPLICATIONS INFORMATION Operation The LTC1536 is a low power, high accuracy triple supply monitoring circuit. This reset generator has two basic functions: generation of a reset when power supplies are out of range, and generation of a reset or “soft” reset when the reset button is pushed. The LTC1536 has the added feature that when the reset supplies are grossly undervolt- age there is a very short delay from undervoltage detect to assertion of RST. Supply Monitoring All three VCC inputs must be above predetermined thresh- olds for 200ms before the reset output is released. The LTC1536 will assert reset during power-up, power-down and brownout conditions on any one or more of the VCC inputs. On power-up, either the VCC5 or VCC3 pin can power the drive circuits for the RST pin. This ensures that RST will be low when either VCC5 or VCC3 reaches 1V. As long as any one of the VCC inputs is below its predetermined threshold, RST will stay a logic low. Once all of the VCC inputs rise above their thresholds, an internal timer is started and RST is released after 200ms. RST outputs the inverted state of what is seen on RST. RST is reasserted whenever any one of the VCC inputs drops below its predetermined threshold and remains asserted until 200ms after all of the VCC inputs are above their thresholds. On power-down, once any of the VCC inputs drops below its threshold, RST is held at a logic low. A logic low of 0.4V is guaranteed until VCC3 and VCC5 drops below 1V. Pushbutton Reset The LTC1536 provides a pushbutton reset input pin. The PBR input has an internal pull-up current source to VCC3. If the PBR pin is not used it can be left floating. |
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