Jan 14, 2003 - these devices can be used with external components to detect user ..... power supply. · NMOS open drain output application with R-C delay.
HT70XX Voltage Detector Features · Low power consumption
· Built-in hysteresis characteristic
· Low temperature coefficient
· TO-92 & SOT-89 package
· Built-in high-stability reference source
Applications · Battery checkers
· Microcomputer reset
· Level selectors
· Battery memory backup
· Power failure detectors
· Non-volatile RAM signal storage protectors
General Description 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).
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 2.2V 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.
Selection Table Part No.
Detectable Voltage
Hysteresis Width
Tolerance
HT7022A
2.2V
0.11V
±5%
HT7024A
2.4V
0.12V
±5%
HT7027A
2.7V
0.135V
±5%
HT7033A
3.3V
0.165V
±5%
HT7039A
3.9V
0.195V
±5%
HT7044A
4.4V
0.22V
±5%
HT7050A
5.0V
0.25V
±5%
HT7070A
7.0V
0.35V
±5%
Note:
The output type selection codes are: NMOS open drain normal open, active low For example: The HT7070A is a 7.0V, NMOS open drain active low output
Output type selection table VDD Type
VOUT
VDD>VDET(+)
VDD£VDET(-)
Hi-Z
VSS
A
Rev. 1.60
1
January 14, 2003
HT70XX Block Diagram N channel open drain output (normal open; active low)
VOUT
VDD
VREF
GND
A type
VOUT
VDET
VIN VHYS
Pin Assignment T O -9 2
S O T -8 9
H T 7 0 X X
O U T V D D
F r o n t V ie w
V S S B o tto m
V ie w O U T
Rev. 1.60
V D D
V S S
2
January 14, 2003
HT70XX Pad Assignment
Pad Coordinates
HT70XX (except HT7022A)
HT70XX (except HT7022A)
(0 ,0 )
2
V O U T
V IN
3
Pad No.
X
Y
1
-483.30
-379.50
2
-234.60
-399.50
3
443.90
-386.00 Unit: mm
HT7022A only
G N D
1
Unit: mm
Chip size: 1317 ´ 1158 (mm)2
Pad No.
X
Y
1
-434.34
394.97
2
120.65
461.01
3
774.70
412.75
* The IC substrate should be connected to VDD in the PCB layout artwork. HT7022A only V D D
V S S
O U T
1
2 3
(0 ,0 )
Chip size: 2032 ´ 1321 (mm)2 * The IC substrate should be connected to VDD in the PCB layout artwork.
Absolute Maximum Ratings Supply Voltage, except HT7022A ..................................................................................................VSS-0.3V to VSS+26V Supply Voltage, HT7022A only ....................................................................................................................-0.3V to 13V Output Voltage ...........................VSS-0.3V to VDD+0.3V
Storage Temperature ............................-50°C to 125°C
Power Consumption ..........................................200mW
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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