M40SZ100Y_07 STMICROELECTRONICS [STMicroelectronics], M40SZ100Y_07 Datasheet - Page 12

• Manufacturer Part Number: M40SZ100Y_07
• Description: 5V or 3V NVRAM supervisor for LPSRAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

2.2
2.3
Figure 8.
1. With pull-up resistor
Table 3.
1. Valid for ambient operating temperature: T
2. Pulse width less than 50ns will result in no RESET (for noise immunity).
3. C
2.4
12/25
L
t
= 5pF (see
Symbol
t
R1HRH
RLRH
RST
RSTIN
(2)
(3)
Power-on reset output
All microprocessors have a reset input which forces them to a known state when starting.
The M40SZ100Y/W has a reset output (RST) pin which is guaranteed to be low by V
(see
resistor to V
voltage conditions, even when V
Once V
for t
Reset input (RSTIN)
The M40SZ100Y/W provides one independent input which can generate an output reset.
The duration and function of this reset is identical to a reset generated by a power cycle.
Table 3
than t
100k resistor.
RSTIN timing waveform
Reset AC characteristics
Battery low pin
The M40SZ100Y/W automatically performs battery voltage monitoring upon power-up, and
at factory-programmed time intervals of at least 24 hours. The Battery Low (BL) pin will be
asserted if the battery voltage is found to be less than approximately 2.5V. The BL pin will
remain asserted until completion of battery replacement and subsequent battery low
monitoring tests, either during the next power-up sequence or the next scheduled 24-hour
interval.
(1)
Figure 10 on page
REC
Table 7 on page
RLRH
RSTIN low to RSTIN high
RSTIN high to RST high
CC
and
to allow the power supply to stabilize.
exceeds the power failure detect voltage V
will not generate a reset condition. RSTIN is internally pulled up to V
CC
Figure 8
should be chosen to control the rise time. This signal will be valid for all
16).
Parameter
illustrate the AC reset characteristics of this function. Pulses shorter
17). This signal is an open drain configuration. An appropriate pull-up
tRLRH
A
= –40 to 85°C; V
tR1HRH
(1)
CC
equals V
CC
= 2.7 to 3.6V or 4.5 to 5.5V (except where noted).
SS
(with valid battery voltage).
Min
200
40
PFD
, an internal timer keeps RST low
Max
200
AI04768
CC
through a
Unit
ms
ns
PFD