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M41T315Y-85MQ6E Datenblatt(PDF) 8 Page - STMicroelectronics

Teilenummer M41T315Y-85MQ6E
Bauteilbeschribung  Serial Access Phantom RTC Supervisor
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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M41T315Y-85MQ6E Datenblatt(HTML) 8 Page - STMicroelectronics

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M41T315Y*, M41T315V, M41T315W
8/24
Non-volatile Supervisor Operation
A switch is provided to direct power from the bat-
tery input or VCCI to VCCO with a maximum voltage
drop of 0.3 Volts. The VCCO output pin is used to
supply uninterrupted power to CMOS SRAM. The
M41T315Y/V/W safeguards the clock and RAM
data by power-fail detection and write protection.
Power-fail detection occurs when VCCI falls below
VPFD which is set by an internal bandgap refer-
ence. The M41T315Y/V/W constantly monitors
the VCCI supply pin. When VCCI is less than VPFD,
power-fail circuitry forces the chip enable output
(CEO) to VCCI or VBAT-0.2 volts for external RAM
write protection. During nominal supply conditions,
CEO
will track CEI with a propagation delay. Inter-
nally, the M41T315Y/V/W aborts any data transfer
in progress without changing any of the device
registers and prevents future access until VCCI
exceeds VPFD. Figure 7., page 6 illustrates a typi-
cal RAM/clock interface.
Figure 8. READ Mode Waveforms
Figure 9. WRITE Mode Waveforms
DATA OUTPUT VALID
WE
CEI
OE
Q
tCW
tCO
tRC
tOW
tCOE
tODO
tRR
tOD
tOE
tOEE
AI04259
DATA INPUT STABLE
OE
D
CEI
tWP
tWC
tCW
tDH
tWR
tWR
WE
t DH
tDS
AI04261


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