M41ST84YMQ1TR データシートの表示（PDF） - STMicroelectronics

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M41ST84YMQ1TR

5.0 or 3.0V, 512 bit (64 x 8) SERIAL RTC with SUPERVISORY FUNCTIONS

STMicroelectronics 

M41ST84Y, M41ST84W

Power-on Reset

The M41ST84Y/W 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 appro-

priate pull-up resistor should be chosen to control

rise time.

Figure 19. RSTIN Timing Waveform

Reset Input (RSTIN)

The M41ST84Y/W provides an independent input

which can generate an output reset. The duration

and function of this reset is identical to a reset gen-

erated by a power cycle. Table 12, page 21 and

Figure 19, page 21 illustrate the AC reset charac-

teristics of this function. Pulses shorter than tRLRH

will not generate a reset condition. RSTIN is inter-

nally pulled up to VCC through a 100kΩ resistor.

RSTIN

tRLRH

RST (1)

tRHRSH

Note: With pull-up resistor

AI03682

Table 12. Reset AC Characteristics

Symbol

Parameter(1)

Min

Max

Unit

tRLRH(2)

RSTIN Low to RSTIN High

200

ns

tRHRSH(3)

RSTIN High to RST High

40

200

ms

Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.7 to 3.6V or 4.5 to 5.5V (except where noted).

2. Pulse width less than 50ns will result in no RESET (for noise immunity).

3. Programmable (see Table 14, page 23)

21/31

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