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M41ST87WMX6TR датащи(PDF) 24 Page - STMicroelectronics

номер детали M41ST87WMX6TR
подробное описание детали  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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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST87WMX6TR датащи(HTML) 24 Page - STMicroelectronics

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Operating modes
M41ST87W
24/54
DocID9497 Rev 11
Table 6: Tamper detect timing
Symbol
Parameter
CLRPW1
CLRPW0
Min
Typ
Max
Unit
tCLRD
(1)
Tamper RAM clear ext delay
X
X
1.0
(2)
1.5
2.0
ms
tCLR
Tamper clear timing
0
0
1
s
0
1
4
s
1
0
8
s
1
1
16
s
Notes:
(1)With input capacitance = 70 pF and resistance = 50 Ω.
(2)
If the OF bit is set, tCLRD(min) = 0.5 ms.
Figure 20: RAM clear hardware hookup (SOX28 package only)
1.
Most inverting charge pumps drive OUT to ground when device shut down is enabled
(
SHDN=logiclow).Therefore,ann-channelenhancementmodeMOSFETshouldbe
used to isolate the OUT pin from the VOUT of the M41ST87.
2.
In order to avoid turning on an on-chip parasitic diode when driving VOUT negative, a p-
channel enhancement mode MOSFET should be used to isolate the VOUT pin from the
negative voltage generated by the inverting charge pump.
VCC
PFO1
EX
SCL
M41ST87Y/W
WDI
RSTIN1
RSTIN2
PFI1
PFI2
VSS
VBAT
F32k
IRQ/OUT
SQW/FT
RST
VOUT
ECON
SDA
CAP+ CAP–
Inverting
Charge
Pump
SHDN
OUT
IN
TP1IN
TPCLR
TP2IN
Pushbutton
Reset
PFO2
Low-Power
SRAM
VCC
Negative Output
(–1 x VIN)
E
To RST
To LED Display
(2)
(1)
To NMI
To INT
To 32kHz
Inhibit
5V
Regulator
VCC
VIN



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