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M41ST87WMX6F Scheda tecnica(PDF) 44 Page - STMicroelectronics

Il numero della parte M41ST87WMX6F
Spiegazioni elettronici  5.0 and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
PDF  54 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST87WMX6F Scheda tecnica(HTML) 44 Page - STMicroelectronics

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DC and AC parameters
M41ST87W
44/54
DocID9497 Rev 11
(3)
RSTIN1andRSTIN2internallypulleduptoVCCthrough100kΩresistor.WDIinternallypulled-downtoVSSthrough100kΩ
resistor.
(4)
Outputs deselected.
(5)
External SRAM must match RTC supervisor chip VCC specification.
(6)
For
PFO1andPFO2(ifPFOD='0'),SQW/FT(ifSQWOD='0'),andTPCLRpins(CMOS).
(7)Conditioned output (E̅CON) can only sustain CMOS leakage current in the battery backup mode. Higher leakage currents will
reduce battery life.
(8)
TPCLR output can source –300 µA (typ) for VBAT = 2.9 V.
(9)
For
IRQ/OUT,SQW/FT(ifSQWOD='1'),PFO1andPFO2(ifPFOD='1'),RST,SDA,andF32kpins(opendrain).
Table 20: Crystal electrical characteristics
Symbol
Parameter
(1)
Min
Typ
Max
Units
fO
Resonant frequency
32.768
kHz
RS
Series resistance
65
(2)
kΩ
CL
Load capacitance
12.5
pF
Notes:
(1)
Load capacitors are integrated within the M41ST87. Circuit board layout considerations for the 32.768 kHz crystal of minimum
trace lengths and isolation from RF generating signals should be taken into account.
(2)
TA = –40 to 85 °C (guaranteed by design).
Note: Crystal: user supplied for the 20-lead SSOP package. STMicroelectronics
recommends the KDS DT-38 (3 x 8 mm) for thru-hole, or the KDS DMX-26S for surface-
mount, tuning fork-type quartz crystals.



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