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-226AA, micro size TSOP-5, 8-pin SO-8 and Micro8 surface
mount packages. The NCV device is packaged in SO- 8 and
TO-226AA.
Applications include direct monitoring of the 5.0 V MPU/logic
power supply used in appliance, automotive, consumer and industrial
equipment.
• 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-226AA, TSOP-5, SO-8 and Micro8 Surface Mount
Packages
Input
2 (2)
http://onsemi.com
TO-226AA
P SUFFIX
CASE 29
1
2
Pin 1. Reset
2. Input
3. Ground
3
SO-8
D SUFFIX
CASE 751
8
1
Micro8
DM SUFFIX
CASE 846A
8
1
Pin 1.
2.
3.
4.
5.
TSOP-5
SN SUFFIX
CASE 483
5
1
PIN CONNECTIONS
Reset 1
7 N.C.
N.C. 3
6 N.C.
Ground 4
1 (1)
8 N.C.
Input 2
Reset
Reset
Input
Ground
NC
NC
5 N.C.
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
1.2 Vref
DEVICE MARKING INFORMATION
Gnd
3 (4)
= Sink Only
Positive True Logic
See general marking information in the device marking
section on page 7 of this data sheet.
Pin numbers adjacent to terminals are for the 3-pin TO-226AA package.
Pin numbers in parenthesis are for the 8-lead packages.
This device contains 21 active transistors.
Figure 1. Representative Block Diagram
© Semiconductor Components Industries, LLC, 2003
May, 2003 - Rev. 9
1
Publication Order Number:
MC34064/D