MC34064, MC33064,
NCV33064
Undervoltage Sensing
Circuit
The MC34064 is an undervoltage sensing circuit specifically
designed for use as a reset controller in microprocessor−based
systems. It offers the designer an economical solution for low voltage
detection with a single external resistor. The MC34064 features a
trimmed−in−package bandgap reference, and a comparator with
precise thresholds and built-in hysteresis to prevent erratic reset
operation. The open collector reset output is capable of sinking in
excess of 10 mA, and operation is guaranteed down to 1.0 V input with
low standby current. The MC devices are packaged in 3−pin TO-92,
micro size TSOP−5, 8−pin SOIC−8 and Micro8t surface mount
packages. The NCV device is packaged in SOIC−8 and TO−92.
Applications include direct monitoring of the 5.0 V MPU/logic
power supply used in appliance, automotive, consumer and industrial
equipment.
http://onsemi.com
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1
1
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Trimmed−In−Package Temperature Compensated Reference
Comparator Threshold of 4.6 V at 25°C
Precise Comparator Thresholds Guaranteed Over Temperature
Comparator Hysteresis Prevents Erratic Reset
Reset Output Capable of Sinking in Excess of 10 mA
Internal Clamp Diode for Discharging Delay Capacitor
Guaranteed Reset Operation with 1.0 V Input
Low Standby Current
Economical TO−92, TSOP−5, SOIC−8 and Micro8 Surface Mount
Packages
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
Pb−Free Packages are Available
Micro8
DM SUFFIX
CASE 846A
TSOP−5
SN SUFFIX
CASE 483
8
5
Features
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•
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SOIC−8
D SUFFIX
CASE 751
8
Pin 1.
2.
3.
4.
5.
Ground
Input
Reset
NC
NC
TO−92
P SUFFIX
CASE 29
12
1
3
STRAIGHT LEAD
BULK PACK
2
3
BENT LEAD
TAPE & REEL
AMMO PACK
Pin 1. Reset
2. Input
3. Ground
Input
Reset
PIN CONNECTIONS
Reset 1
8 N.C.
Input 2
7 N.C.
N.C. 3
6 N.C.
Ground 4
5 N.C.
(Top View)
1.2 Vref
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
GND
= Sink Only
Positive True Logic
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 7 of this data sheet.
This device contains 21 active transistors.
Figure 1. Representative Block Diagram
© Semiconductor Components Industries, LLC, 2008
August, 2008 − Rev. 18
1
Publication Order Number:
MC34064/D
