MAX800LESE datasheet(11/17 Pages) MAXIM

Part #	MAX800LESE

Description	Microprocessor Supervisory Circuits

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Microprocessor Supervisory Circuits

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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

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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