m41st87w STMicroelectronics, m41st87w Datasheet - Page 21

• Manufacturer Part Number: m41st87w
• Description: 5.0, 3.3, Or 3.0v, 1280 Bit 160 X8 Secure Serial Rtc And Nvram Supervisor With Tamper Detection
• Manufacturer: STMicroelectronics

Figure 20. RAM Clear Hardware Hookup
Note: 1. Most inverting Charge Pumps drive OUT to Ground when device shut down is enabled (SHDN = logic low). Therefore, an n-channel
2. In order to avoid turning on an on-chip parasitic diode when driving V
enhancement mode MOSFET should be used to isolate the OUT pin from the V
should be used to isolate the V
Pushbutton
V
Reset
Regulator
IN
Inhibit
5V
V
CC
OUT
pin from the negative voltage generated by the inverting Charge Pump.
V
TP1
TP2
EX
SCL
WDI
RSTIN1
RSTIN2
PFI
PFI
V
V
CC
SS
BAT
1
2
IN
IN
M41ST87Y/W
IRQ/OUT
SQW/FT
TP
E
PFO
PFO
V
SDA
RST
F
CON
OUT
CLR
32k
1
2
CAP+ CAP–
IN
SHDN
OUT
Inverting
Charge
Pump
To RST
To LED Display
To NMI
To INT
To 32kHz
negative, a p-channel enhancement mode MOSFET
OUT
OUT
(2)
of the M41ST87.
Negative Output
(1)
M41ST87Y, M41ST87W
(–1 x V IN )
V
E
CC
Low-Power
SRAM
AI07804
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