MAX697 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX697 Datasheet PDF : 16 Pages
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MAX696/MAX697
Microprocessor Supervisory Circuits
Table 1. MAX696 and MAX697 Reset Pulse Width and Watchdog Timeout Selections
(Notes 1, 2)
OSC SEL
(Note 3)
OSC IN
WATCHDOG TIMEOUT PERIOD
NORMAL
IMMEDIATELY
AFTER RESET
RESET TIMEOUT
PERIOD
Low
External Clock Input 1024 clocks
4096 clocks
512 clocks
Low
External Capacitor 400ms/47pF x C
1.6s/47pF x C
200ms/47pF x C
High/Floating
Low
100ms
1.6s
50ms
High/Floating
Floating
1.6s
1.6s
50ms
Note 1: When the MAX696/MAX697 OSC SEL pin is low, OSC IN can be driven by an external clock signal, or an external
capacitor can be connected between OSC IN and GND. The nominal internal oscillator frequency is 10.24kHz. The
nominal oscillator frequency with external capacitor is fOSC (Hz) = 184,000/COSC (pF).
Note 2: See the Electrical Characteristics table for minimum and maximum timing values.
Note 3: High for the OSC SEL pin should be connected to VOUT, not VCC (on the MAX696).
Table 2. Input and Output Status in Battery-Backup Mode
I/O
VBATT, VOUT
RESET
RESET
LOW LINE
BATT ON
STATUS
VBATT is connected to VOUT with an internal MOSFET (MAX696 only).
Logic-low.
Logic-high. The open-circuit output voltage is equal to VOUT.
Logic-low.
Logic-high (MAX696 only).
WDI
WDO
PFI
PFO
CE IN
CE OUT
OSC IN
OSC SEL
VCC
WDI is internally disconnected from its internal pullup and does not source or sink current as long as its input
voltage is between GND and VOUT. The input voltage does not affect supply current.
Logic-high.
The power-fail comparator is turned off and the power-fail input voltage has no effect on the power-fail output.
Logic-low.
CE IN is internally disconnected from its internal pullup and does not source or sink current as long as its input
voltage is between GND and VOUT. The input voltage does not affect supply current (MAX696 only).
Logic-high (MAX697 only).
OSC IN is ignored.
OSC SEL is ignored.
Approximately 12µA is drawn from the VBATT input when VCC is between (VBATT + 100mV) and (VBATT -
700mV). The supply current is 1µA maximum when VCC is less than VBATT - 700mV.
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