M41ST85W datasheet(20/34 Pages) STMICROELECTRONICS

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M41ST85W

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Power-on Reset

The M41ST85W 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 Inputs (RSTIN1 & RSTIN2)

The M41ST85W 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 5. and Figure

19. 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 100k

Ω resistor.

Figure 19. RSTIN1 & RSTIN2 Timing Waveforms

Note: With pull-up resistor

Table 5. 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. Pulse width less than 20ms will result in no RESET (for noise immunity).

4. Programmable (see Table 6., page 22).

Symbol

Parameter(1)

Min

Max

Unit

tRLRH1

(2)

RSTIN1 Low to RSTIN1 High

200

tRLRH2

(3)

RSTIN2 Low to RSTIN2 High

100

tR1HRH

(4)

RSTIN1 High to RST High

200

tR2HRH

(4)

RSTIN2 High to RST High

200

AI03665

RSTIN2

RST

(1)

RSTIN1

tRLRH1

tRLRH2

tR1HRH

tR2HRH

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