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MC34921AER2 Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC34921AER2 Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 36 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 34921 STATIC ELECTRICAL CHARACTERISTICS Supervisor Circuitry Minimum Function B+ for Charge Pump, Oscillator Up Reset/Fault Registers Valid (10) B+ 9.0 – – V Minimum Function V5.0 for RST Operational RST VOL ≤ 0.05 V @ 1.0 mA (10) V5.0 RST 2.0 – – V Minimum Function V3.3 for RST Operational RST VOL ≤ 0.05 V @ 1.0 mA (10) V3.3 RST 2.0 – – V RST Low Voltage (11) IRST ≤ 5.0 mA VOL – 0.1 0.25 V RST V5.0 Threshold V5.0 Rising V5.0 Falling V5.0 t+ V5.0 t– – 4.5 4.65 4.6 4.75 4.70 V RST Hysteresis for V5.0 VHYSV5.0 10 50 – mV RST V3.3 Threshold V3.3 Rising V3.3 Falling V3.3t+ V3.3t– – 2.8 2.9 2.9 3.15 3.0 V RST Hysteresis for V3.3 VHYS_3.3 10 15 – mV RST VCORE Threshold VCORE Falling VCORE 85 86 90 %VCORE_ NOM RST Hysteresis for VCORE VHYS CORE – 10 – mV Overtemperature Junction Temperature(12) TJ Rising TJ(OVER) 140 – – °C Overtemperature Hysteresis(12) TJ Falling TJ(HYS) 10 – 30 °C Thermal Warning (12) TW TJ -30 – TJ -20 °C B+ Undervoltage Threshold to Assert RST V5.0 = +5.0 V, B+ Falling B+(FAULT) 12 12.75 13.5 V B+ Undervoltage Threshold Hysteresis(13) B+FAULT(HYS) 1.0 1.5 2.0 V Minimum B+ Necessary to Clear B+ Fault V5.0 = +5.0 V, B+ Rising B+RECOVERY – – 15.25 V Notes 10. If any of these conditions for this not is true, then RST is activated until all operating conditions are met. 11. The RST terminal uses an external pull-up, which may be to 5.0 V or 3.3 V. 12. Guaranteed by design. 13. Alternately, the minimum B+ fault threshold voltage must not be lower than 12 V, and the B+ fault clear voltage must not be higher than 15.25 V. The hysteresis may be greater than 2.0 V if this requirement is met. Table 3. Static Electrical Characteristics (continued) Characteristics noted under conditions 16 V ≤ B+ ≤ 34 V, 0 °C ≤ TA ≤ 70°C, and 0°C ≤ TJ ≤ 100°C unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted. Characteristic Symbol Min Typ Max Unit |
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