zsm561 Zetex Semiconductors plc., zsm561 Datasheet - Page 5

• Manufacturer Part Number: zsm561
• Description: Supply Voltage Monitor
• Manufacturer: Zetex Semiconductors plc.

APPLICATION CIRCUITS
T
R
V
by the unregulated supply.
I
I
system.
Q
L
DY
B
INMIN
= Load current taken by the microprocessor
= The ZSM561 quiescent current (ie 200 A)
ZSM561
RCd ln
V
= The minimum input voltage provided
I
INMIN
Q
h
I
FE
L
1
6
V
TH mpu
1
V
in
T
V
V
4-368
DY
TH
in
= Time (Seconds)
= Microprocessor ResetThreshold
= Power Supply Voltage
h
from the pass transistor under worst case
conditions. (ie Lowest temperature and
minimum input voltage). For the ZTX690B a
value of 250 could be used.
FE
= The minimum h
FE
that can be expected