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L4904A

DUAL 5V REGULATOR WITH RESET

STMicroelectronics 

Figure 2

L4904A

APPLICATION SUGGESTIONS

Figure 3 shows an application circuit for a µP

system.

Reg. 1 is permanently connected to a battery and

supplies a CMOS time-of-day clock and a CMOS

microcomputer chip with volatile memory.

Reg. 2 may be switched OFF when the system is

inactive.

Figure 4 shows the L4904A with a back up battery

on the V01 output to maintain a CMOS time-of-day

Figure 3

clock and a stand by type C-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.

Application Circuits of a Microprocessor system

(Figure 3) or with data save battery (Figure 4). The

reset output provide delayed rising front at the

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