Datasheet

ADP3367
–8–
REV. 0
C2083–10–10/95
PRINTED IN U.S.A.
processor. Monitoring the supply, the ADM705 will generate a
reset if the supply voltage falls below 4.65 V. Early warning of
an impending power fail is generated by a power fail comparator
on the ADM705. A resistive divider network samples the pre-
regulator input voltage so that failing power is detected while
the regulator is still operating normally. An interrupt is gener-
ated so that a power-down sequence can be completed before
power is completely lost. The low dropout voltage on the
ADP3367 maximizes the available time to carry out the power-
down sequence. The resistor divider network R1 and R2 should
be selected so that the voltage on PFI is 1.25V at the desired
warning voltage.
IN
OUT
GND SET SHDN
ADP3367
10µF
+
+5V
ADM705
RESET
PFO
GND
PFI
UNREGULATED
DC
R1
R2
V
CC
µP
RESET
INTERRUPT
V
CC
Figure 15. µ P Regulator with Supply Monitoring and Early
Power-Fail Warning
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Lead Narrow-Body SOIC
(SO-8)
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8 °
0 °
0.0196 (0.50)
0.0099 (0.25)
x 45 °
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.2440 (6.20)
0.2284 (5.80)
4
5
1
8
0.0192 (0.49)
0.0138 (0.35)
0.0500
(1.27)
BSC
0.0688 (1.75)
0.0532 (1.35)
0.0098 (0.25)
0.0040 (0.10)
0.1968 (5.00)
0.1890 (4.80)