m41st84w STMicroelectronics, m41st84w Datasheet - Page 20

• Manufacturer Part Number: m41st84w
• Description: 3.0/3.3v I 2c Serial Rtc With Supervisory Functions
• Manufacturer: STMicroelectronics

M41ST84W
Power-on Reset
The M41ST84W continuously monitors V
When V
the RST pulls low (open drain) and remains low on
power-up for t
The RST pin is an open drain output and an appro-
priate pull-up resistor should be chosen to control
rise time.
Figure 17. RSTIN Timing Waveform
Note: With pull-up resistor
Table 6. Reset AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
20/29
2. Pulse width less than 50ns will result in no RESET (for noise immunity).
3. Programmable (see
t
Symbol
t
RHRSH
RLRH
CC
RSTIN
RST
(2)
falls to the power fail detect trip point,
(3)
(1)
rec
after V
RSTIN Low to RSTIN High
RSTIN High to RST High
Table 8., page
CC
passes V
Parameter
22)
tRLRH
tRHRSH
PFD
A
= –40 to 85°C; V
(1)
(max).
CC
.
CC
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.
Figure 17., page 20
teristics of this function. Pulses shorter than t
will not generate a reset condition. RSTIN is inter-
nally pulled up to V
= 2.7 to 3.6V (except where noted).
Min
200
40
CC
illustrate the AC reset charac-
through a 100k
Max
200
Table 6., page 20
AI03682
resistor.
Unit
ms
ns
RLRH
and