Document
HT70XX Voltage Detector
Features
· · ·
Low power consumption Low temperature coefficient Built-in high-stability reference source
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Built-in hysteresis characteristic TO-92 & SOT-89 package
Applications
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Battery checkers Level selectors Power failure detectors
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Microcomputer reset Battery memory backup Non-volatile RAM signal storage protectors
General Description
The HT70XX series is a set of three-terminal low power voltage detectors implemented in CMOS technology. Each voltage detector in the series detects a particular fixed voltage ranging from 2.4V to 7V. The voltage detectors consist of a high-precision and low power consumption standard voltage source, a comparator, hysteresis circuit, and an output driver. CMOS technology ensures low power consumption. Although designed primarily as fixed voltage detectors, these devices can be used with external components to detect user specified threshold voltages (NMOS open drain type only).
Selection Table
Part No. HT7024A HT7027A HT7033A HT7039A HT7044A HT7050A HT7070A Detectable Voltage 2.4V 2.7V 3.3V 3.9V 4.4V 5V 7V Hysteresis Width 0.12V 0.135V 0.165V 0.195V 0.22V 0.25V 0.35V Tolerance ±5% ±5% ±5% ±5% ±5% ±5% ±5%
Note: The output type selection codes are: NMOS open drain normal open, active low PMOS open drain normal open, active high For example: The HT7070A is a 7V, NMOS open drain active low output
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May 3, 2000
HT70XX
Output type selection table VDD Type VOUT A VDD>VDET(+) Hi-Z VDD£VDET(-) VSS
Block Diagram
N channel open drain output (normal open; active low)
VDD
VOUT
VREF
GND
A type
VOUT
VDET VHYS
VIN
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HT70XX
Pin Assignment
T O -9 2 H T 7 0 X X
F r o n t V ie w
Pad Assignment
S O T -8 9
(0 ,0 )
1 2 V O U T
3 G N D
V IN
O U T V D D
V S S B o tto m V ie w O U T V D D V S S
Chip size: 1317 ´ 1158 (mm)
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* The IC substrate should be connected to VDD in the PCB layout artwork.
Pad Coordinates
Pad No. 1 2 3 X -483.30 -234.60 443.90 Y
Unit: mm
-379.50 -399.50 -386.00
Absolute Maximum Ratings
Supply Voltage...............................-0.3V to 26V Output Voltage ..............VSS-0.3V to VDD+0.3V Power Consumption...............................200mW Output Current .........................................50mA Storage Temperature.................-50°C to 125°C Operating Temperature ..................0°C to 70°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
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May 3, 2000
HT70XX
Electrical Characteristics
HT7024A Symbol VDET VHYS IDD VDD IOL DVDET DTA HT7027A Symbol VDET VHYS IDD VDD IOL DVDET DTA Parameter Hi®Lo Detectable Voltage Lo®Hi Detectable Voltage Hysteresis Width Operating Current Operating Voltage Output Sink Current Temperature Coe.