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M41ST87Y Datasheet(PDF) 43 Page - STMicroelectronics

No. de pieza M41ST87Y
Descripción Electrónicos  5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
PDF  48 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST87Y Datasheet(HTML) 43 Page - STMicroelectronics

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M41ST87Y, M41ST87W
DC and AC parameters
43/48
Figure 27.
Power down/up mode AC waveforms
4.
Outputs deselected.
5.
External SRAM must match RTC supervisor chip VCC specification.
6.
For rechargeable backup, VBAT (max) may be considered VCC.
7.
For PFO1 and PFO2 (if PFOD = '0'), SQW/FT (if SQWOD = '0'), and TPCLR pins (CMOS).
8.
Conditioned output (ECON) can only sustain CMOS leakage current in the battery backup mode. Higher leakage currents
will reduce battery life.
9.
TPCLR output can source –300 µA (typ) for VBAT = 2.9 V.
10. For IRQ/OUT, SQW/FT (if SQWOD = '1'), PFO1 and PFO2 (if PFOD = '1'), RST, SDA, and F32k pins (open drain).
AI07085
VCC
INPUTS
(PER CONTROL INPUT)
OUTPUTS
DON'T CARE
HIGH-Z
tF
tFB
tR
tPD
tRB
VALID
VALID
(PER CONTROL INPUT)
RECOGNIZED
RECOGNIZED
VPFD (max)
VPFD (min)
VSO
trec
RST
ECON
PFO
VALID
VALID



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