M41ST84WMQ6 datasheet(20/29 Pages) STMICROELECTRONICS

20 / 29 page

M41ST84W

20/29

Power-on Reset

The M41ST84W 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 M41ST84W 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 6., page 20 and

Figure 17., page 20 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 17. RSTIN Timing Waveform

Note: With pull-up resistor

Table 6. Reset AC Characteristics

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

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

3. Programmable (see Table 8., page 22)

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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