L4901 データシートの表示（PDF） - STMicroelectronics

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L4901

DUAL 5V REGULATOR WITH RESET

STMicroelectronics 

L4901A

inactive.

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 casethe 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

6/10

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