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PT7M6832GD4C3E Datasheet(PDF) 6 Page - Pericom Semiconductor Corporation |
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PT7M6832GD4C3E Datasheet(HTML) 6 Page - Pericom Semiconductor Corporation |
6 / 12 page ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2013-11-0003 PT0236-6 11/18/13 6 PT7M6832-6840 Ultra Low Voltage Detectors Functional Description Reset Output The PT7M6832–PT7M6840 assert a reset to prevent code- execution errors during power-up, power-down, or brownout conditions. They also assert a reset signal whenever the Vcc supply voltage falls below a preset threshold (PT7M6832– PT7M6837) or RESET-IN falls below the adjustable threshold (PT7M6838-PT7M6840), keeping reset asserted for a fixed timeout delay (Table 2) after Vcc or RESET-IN has risen above the reset threshold. The PT7M6832/6835/6838 use a push-pull active-low output, the PT7M6833/6836/6839 have a push-pull active-high output, and the PT7M6834/6837/ 6840 have an open-drain active- low output stage. Connect a pull- up resistor on the PT7M6834/6837/ 6840’s RESET output to any supply between 0 and 6V. Manual Reset Input Reset remains asserted while MR is low, and for a fixed timeout delay after MR returns high. This input has an internal 20kΩ pull-up resistor, so it can be left open if it is not used. MR can be driven with CMOS logic level, or with open- drain/collector outputs. To create a manual reset function, connect a normally open momentary switch from MR to ground; external debounce circuitry is not required. RESET-IN The PT7M6838/6839/6840 features a RESET-IN input for monitoring supply voltages down to 0.44V. An external resistive-divider network can be used to set voltage monitoring thresholds as shown in Fig.3. As the monitored voltage falls, the voltage at RESET-IN decreases and asserts a reset when it falls below the RESET-IN threshold(VRSTIN). The low-leakage current at RESET-IN allows for relatively large-value resistors to be used, which reduce power consumption. For example, for a 0.6V monitored trip level, if R2 = 200kΩ, then R1 = 70.3kΩ. Note: The minimum Vcc of 1.3V is required to guarantee the RESET-IN threshold accuracy. RESET (RESET) VREF=444mV RESET-IN VCC Vmonitored PT7M6838 /6839 /6840 R1 R2 R1=R2(Vmonitored/VREF-1) () is for PT7M6839 Fig.3 External setting of adjustable threshold |
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