L4901 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
View to exact match
L4901 Datasheet PDF : 10 Pages
| |||
L4901A
tion.
This output may thereforebe usedto supply circuits
continuously, such as volatile RAMs, allowing the
use of a back-up battery. The V01 regulator also
features low consumption (0.6 mA typ.) to minimize
battery drain in applicationswhere the V1 regulator
is permanently connected to a battery supply.
The V02 output can supply other non essential 5 V
circuits which may be powered down when the
system is inactive, or that must be powered down
to prevent uncorrect operation for supply voltages
below the minimum value.
The reset output can be usedas a ”POWERDOWN
Figure 2
INTERRUPT”, permitting RAM access only in cor-
rect powerconditions,or as a ”BACK-UPENABLE”
to transfer data into in a NV SHADOW MEMORY
when the supply is interrupted.
APPLICATIONS SUGGESTIONS
Figure 2 shows an application circuit for a µP
system typically used in trip computers or in car
radios with programmable tuning.
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
Figure 3 : P.C. Board Component Layout of Figure 2.
5/10
Share Link: 