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L4901 Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte L4901
Spiegazioni elettronici  DUAL 5V REGULATOR WITH RESET
PDF  10 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4901 Scheda tecnica(HTML) 6 Page - STMicroelectronics

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Figure 4 shows the L4901A with a back up battery
on the V01 output to maintain a CMOS time-of-day
clock and a stand by type N-MOS
µP. The reset
output makes sure that the RAM is forced into the
low consumption stand by state, so the access to
memory is inhibit and the back up battery voltage
cannot drop so low that memory contents are cor-
rupted.
In this case the main on-off switch disconnects both
regulators from the supply battery.
The L4901A is also ideal for microcomputer sys-
tems using battery backup CMOS static RAMs. As
shown in Figure 5 the reset output is used both to
Figure 4
Figure 5
L4901A
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