M41T94MH6F datasheet(22/39 Pages) STMICROELECTRONICS

22 / 39 page

Clock operations

M41T94

22/39

DocID7564 Rev 8

4.6

Power-on reset

The M41T94 continuously monitors VCC. When VCC falls to the power fail detect trip point,

the RST pulls low (open drain) and remains low on power-up for tREC after VCC passes

VPFD (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 tRLRH1 and tRLRH2 will not generate a reset condition. RSTIN1

and RSTIN2 are each internally pulled up to VCC through a 100 kΩ resistor.

Table 6. Square wave output frequency

Square wave bits

Square wave

RS3

RS2

RS1

RS0

Frequency

Units

None

–

32.768

kHz

8.192

kHz

4.096

kHz

2.048

kHz

1.024

kHz

512

256

128

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