M41ST84WMH ST Microelectronics, M41ST84WMH Datasheet - Page 21

• Manufacturer Part Number: M41ST84WMH
• Description: 5.0 or 3.0V / 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS
• Manufacturer: ST Microelectronics

Power-on Reset
The M41ST84Y/W 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 19. RSTIN Timing Waveform
Note: With pull-up resistor
Table 12. Reset AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
2. Pulse width less than 50ns will result in no RESET (for noise immunity).
3. Programmable (see Table 14, page 23)
t
Symbol
RHRSH
t
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
CC
passes V
Parameter
tRLRH
tRHRSH
PFD
A
= –40 to 85°C; V
(1)
(max).
CC
.
CC
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 t
will not generate a reset condition. RSTIN is inter-
nally pulled up to V
= 2.7 to 3.6V or 4.5 to 5.5V (except where noted).
Min
200
40
CC
M41ST84Y, M41ST84W
through a 100k
Max
200
AI03682
resistor.
Unit
ms
ns
RLRH
21/31