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MAX800LESE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX800LESE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 17 page Microprocessor Supervisory Circuits ______________________________________________________________________________________ 11 Power-Fail Output The Power-Fail Output (PFO) goes low when PFI goes below 1.25V. It typically sinks 3.2mA with a saturation voltage of 0.1V. With PFI above 1.25V, PFO is actively pulled to VOUT. Battery-Backup Mode Two conditions are required to switch to battery-back- up mode: 1) VCC must be below the reset threshold, and 2) VCC must be below VBATT. Table 2 lists the sta- tus of the inputs and outputs in battery-backup mode. Battery-On Output The Battery-On (BATT ON) output indicates the status of the internal VCC/battery-switchover comparator, which controls the internal VCC and VBATT switches. For VCC greater than VBATT (ignoring the small hys- teresis effect), BATT ON typically sinks 3.2mA at 0.1V saturation voltage. In battery-backup mode, this termi- nal sources approximately 10µA from VOUT. Use BATT ON to indicate battery-switchover status or to supply base drive to an external pass transistor for higher-cur- rent applications (see Typical Operating Circuit). Input Supply Voltage The Input Supply Voltage (VCC) should be a regulated 5V. VCC connects to VOUT via a parallel diode and a large PMOS switch. The switch carries the entire cur- rent load for currents less than 250mA. The parallel diode carries any current in excess of 250mA. Both the switch and the diode have impedances less than 1 Ω each. The maximum continuous current is 250mA, but power-on transients may reach a maximum of 1A. MAX691A MAX693A MAX800L MAX800M CE IN CLOAD CE OUT GND +5V 50 Ω OUTPUT IMPEDANCE VCC VBATT 2.8V MAX691A MAX693A MAX800L MAX800M PFI PFO GND +5V VCC VBATT 2.0V to 5.5V LOW BATT Figure 6. CE Propagation Delay Test Circuit Figure 7. Low-Battery Indicator PIN NAME STATUS 1 VBATT Supply current is 1µA max. 2 VOUT VOUT is connected to VBATT through an internal PMOS switch. 3 VCC Battery switchover comparator monitors VCC for active switchover. 4 GND GND 0V, 0V reference for all signals. 5 BATT ON Logic high. The open-circuit output is equal to VOUT. 6 LOWLINE Logic low* 7 OSC IN OSC IN is ignored. 8 OSC SEL OSC SEL is ignored. 9 PFI The power-fail comparator remains active in the battery-backup mode for VCC ≥ VBATT - 1.2V typ. 10 PFO The power-fail comparator remains active in the battery-backup mode for VCC ≥ VBATT - 1.2V typ. Below this volt- age, PFO is forced low. 11 WDI Watchdog is ignored. 12 CE OUT Logic high. The open-circuit voltage is equal to VOUT. 13 CE IN High impedance 14 WDO Logic high. The open-circuit voltage is equal to VOUT. 15 RESET Logic low* 16 RESET High impedance* Table 2. Input and Output Status in Battery-Backup Mode * VCC must be below the reset threshold to enter battery-backup mode. |
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