Datasheet

Clock operations M41T94

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4.6 Power-on reset

The M41T94 continuously monitors V

. When V

falls to the power fail detect trip point,

the RST

pulls low (open drain) and remains low on power-up for t

REC

after V

passes V

PFD

(max). The RST

pin is an open drain output and an appropriate pull-up resistor should be

chosen to control rise time.

4.7 Reset inputs (RSTIN1 & RSTIN2)

The M41T94 provides two independent inputs which can generate an output reset. The

duration and function of these resets is identical to a reset generated by a power cycle.

Table 7 on page 23 and Figure 13 on page 23 illustrate the AC reset characteristics of this

function. Pulses shorter than t

RLRH1

and t

RLRH2

will not generate a reset condition. RSTIN1

and RSTIN2

are each internally pulled up to V

through a 100 kΩ resistor.

Table 6. Square wave output frequency

Square wave bits Square wave

RS3 RS2 RS1 RS0 Frequency Units

0000None–

000132.768kHz

00108.192kHz

00114.096kHz

01002.048kHz

01011.024kHz

0110512Hz

0111256Hz

1000128Hz

100164Hz

101032Hz

101116Hz

11008Hz

11014Hz

11102Hz

11111Hz