M41ST84W datasheet(21/31 Pages) STMICROELECTRONICS

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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.

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.

Figure 19. RSTIN Timing Waveform

Note: With pull-up resistor

Table 12. Reset AC Characteristics

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)

Symbol

Parameter(1)

Min

Max

Unit

tRLRH

(2)

RSTIN Low to RSTIN High

200

tRHRSH

(3)

RSTIN High to RST High

200

AI03682

RST

(1)

RSTIN

tRLRH

tRHRSH

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