MAX690C 查看數據表（PDF） - Maxim Integrated

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MAX690C

Microprocessor Supervisory Circuits

Maxim Integrated 

MAX690–MAX695

Microprocessor Supervisory Circuits

EXTERNAL CLOCK

8 OSC SEL

MAX691

MAX693

MAX695

0 TO 250kHz

7

OSC IN

INTERNAL OSCILLATOR

1.6s WATCHDOG

N.C.

8

OSC SEL

MAX691

MAX693

MAX695

7

N.C.

OSC IN

EXTERNAL OSCILLATOR

8 OSC SEL

MAX691

MAX693

MAX695

COSC

7

OSC IN

INTERNAL OSCILLATOR

100ms WATCHDOG

N.C.

8

OSC SEL

MAX691

MAX693

MAX695

7

OSC IN

Figure 8. Oscillator Circuits

Table 1. MAX691/MAX693/MAX695 Reset Pulse Width and Watchdog Timeout Selections

OSC SEL

OSC IN

Low

External Clock Input

WATCHDOG TIMEOUT PERIOD

NORMAL

IMMEDIATELY

AFTER REST

1024 clks

4096 clks

RESET TIMEOUT PERIOD

MAX691/MAX693

MAX695

512 clks

2048 clks

Low

External Capacitor

400ms/47pF x C

1.6s/47pF x C

200ms/47pF x C

800ms/47pF x C

Floating

Floating

Low

Floating

100ms

1.6s

1.6s

1.6s

50ms

50ms

200ms

200ms

Note 1: The MAX690/MAX692/MAX694 watchdog timeout period is fixed at 1.6s nominal, the MAX690/692 reset pulse width is fixed

at 50ms nominal and the MAX694 is 200ms nominal.

Note 2: When the MAX691 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 6.55kHz. The nominal oscillator frequency

with capacitor is:

fOSC

(Hz)

=

120,000

C(pF)

Note 3: See Electrical Characteristics table for minimum and maximum timing values.

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