M41ST84YMQ6 STMicroelectronics, M41ST84YMQ6 Datasheet - Page 24

• Manufacturer Part Number: M41ST84YMQ6
• Description: Real Time Clock Serial 512 (64x8)
• Manufacturer: STMicroelectronics

Specifications of M41ST84YMQ6

• Function: Clock, Calendar, Supervisor
• Rtc Memory Size: 64 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: SO-16
• Time Format: HH:MM:SS:hh
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Clock operation
3.8
Note:
3.9
24/34
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 generated by a power cycle.
and
t
kΩ resistor.
Figure 16. RSTIN timing waveform
With pull-up resistor
Table 6.
1. Valid for ambient operating temperature: T
2. Pulse width less than 50 ns will result in no RESET (for noise immunity).
3. Programmable (see
Power-fail INPUT/OUTPUT
The power-fail input (PFI) is compared to an internal reference voltage (1.25 V). If PFI is less
than the power-fail threshold (V
intended for use as an under-voltage detector to signal a failing power supply. Typically PFI
is connected through an external voltage divider (see
unregulated DC input (if it is available) or the regulated output of the V
voltage divider can be set up such that the voltage at PFI falls below V
milliseconds before the regulated V
below the minimum operating voltage.
During battery backup, the power-fail comparator turns off and PFO goes (or remains) low.
This occurs after V
irrespective of V
inputs are recognized. At the end of this time, the power-fail comparator is enabled and PFO
follows PFI. If the comparator is unused, PFI should be connected to V
unconnected.
RLRH
RSTIN
RST
Figure 16
t
Symbol
RHRSH
t
RLRH
will not generate a reset condition. RSTIN is internally pulled up to V
(1)
(2)
(3)
Reset AC characteristics
illustrate the AC reset characteristics of this function. Pulses shorter than
PFI
RSTIN low to RSTIN high
RSTIN high to RST high
CC
for the write protect time (t
Table 8 on page
drops below V
Parameter
tRLRH
PFI
tRHRSH
26)
), the power-fail output (PFO) will go low. This function is
CC
PFD
A
(1)
input to the M41ST84W or the microprocessor drops
= –40 to 85°C; V
(min). When power returns, PFO is forced high,
rec
), which is the time from V
CC
Figure 4 on page
= 2.7 to 3.6 V (except where noted).
Min
200
40
CC
Max
PFI
200
SS
9) to either the
regulator. The
PFD
several
and PFO left
CC
(max) until the
through a 100
M41ST84W
AI03682
Unit
Table 6
ms
ns