MC33161D ON Semiconductor, MC33161D Datasheet - Page 6

• Manufacturer Part Number: MC33161D
• Description: IC VOLTAGE MONITOR UNIV 8-SOIC
• Manufacturer: ON Semiconductor
• Type: Multi-Voltage Supervisorr

Specifications of MC33161D

• Number Of Voltages Monitored: 2
• Output: Open Drain or Open Collector
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Reset: -
• Reset Timeout: -

Comparators
monitoring. Their outputs can provide diagnostic information
to the microprocessor, preventing system malfunctions.
connected to the 2.6 V reference while the Noninverting
Input monitors V
V
voltage. To prevent erratic operation when crossing the
comparator threshold, 70 mV of hysteresis is provided.
detect an impending loss of system power. The Inverting
Input is internally connected to the reference, fixing the
threshold at 2.6 V. The input power source V
by the Noninverting Input through the R
(Figure 11). This input features an adjustable 10 mA to 50
mA current sink I
for resistor R
R
V, the current sink is activated. This produces hysteresis if
V
comparator thresholds are defined as follows:
The nominal hysteresis current I
(Figure 5).
synchronize the microprocessor with the ac line signal for
timing functions, or for synchronous load switching. It can
also be connected as a line loss detector as shown in
Figure 12. The comparator contains 200 mV of hysteresis
preventing erratic output behavior when crossing the input
threshold.
H
in
O
Three separate comparators are incorporated for voltage
The Reset Comparator Inverting Input is internally
The Power Warning Comparator is typically used to
The Uncommitted Comparator can be used to
is omitted. When the comparator input falls below 2.6
falls approximately 180 mV below its regulated
is monitored through a series resistor (R
V
V
th(lower)
th(upper)
H
. A default current of 6.5 mA is provided if
Line
AC
H
O
that is programmed by the value selected
. The Reset Output is active low when
V
= V
in
= V
R
R
ref
2
2.6 V
1
ref
Chip
Disable
1 +
1 +
R
C
in
in
R
R1
R
H
R1
R
V
2
2
H
Figure 11. Typical Microprocessor Application
CC
14
15
10
9
2
1
equals 1.2 V/R
− I
+ I
IB
H
in
Reference
+
R
R
1
2.6 V
is monitored
/R
1
1
MC34160, MC33160
2
1
divider
+
). The
http://onsemi.com
I
H
Shutdown
Thermal
H
I
+
−
+
H
Uncommitted
4, 5, 12, 13
−
+
On/Off
Comparator
6
each have a transistor base−emitter connected across their
inputs. The base input normally connects to a voltage
reference while the emitter input connects to the voltage to
be monitored. The transistor limits the negative excursion
on the emitter input to − 0.7 V below the base input by
supply current from V
forward biasing the IC substrate. Zener diodes are
connected to the comparator inputs to enhance the ICs
electrostatic discharge capability. Resistors R
must limit the input current to a maximum of ±2.0 mA.
NPN transistor capable of sinking 2.0 mA with a saturation
voltage less than 0.4 V, and standing off 40 V with minimal
leakage. Internal bias for the Reset and Power Warning
Comparators is derived from either V
output to ensure functionality when either is below
nominal.
Heat Tab Package
dual−in−line package in which the die is mounted on a
special Heat Tab copper alloy lead frame. This tab consists
of the four center ground pins that are specifically designed
to improve thermal conduction from the die to the
surrounding air. The pictorial in Figure 9 shows a simple
but effective method of utilizing the printed circuit board
medium as a heat dissipator by soldering these tabs to an
adequate area of copper foil. This permits the use of
standard board layout and mounting practices while having
the ability to more than halve the junction to air thermal
resistance. The example and graph are for a symmetrical
layout on a single sided board with one ounce per square
foot copper.
.01 R
0.913 R
−
+
R
The Power Warning and Uncommitted Comparators
Each comparator output consists of an open collector
The MC34160 is contained in a 16 lead plastic
Power
Warning
+
−
Reset
11
16
7
8
6
+
−
C
CC
O
. This clamp current will prevent
MPU Reset
V
V
Power Warning
Line Sync.
=
ref
O
Sink Only
Positive True Logic
CC
or the regulator
1
and R
in