HN809 [HN]
(低电平)复位逻辑输出。在电源上电、掉电以及监控系统电源电压的变化，产生可靠的电源复位信号，使微处理器产生复位或处理中断事件。 典型工作电流为6μA/5V,2.6μA/3.3V,适合电池供电的仪器、设备，可对5V,3.3V和3V电源电压进行检测。;
| 型号： | HN809 |
| 厂家： | 
NANJING HONANO ELECTRONIC CO., LTD. |
| 描述： | (低电平)复位逻辑输出。在电源上电、掉电以及监控系统电源电压的变化，产生可靠的电源复位信号，使微处理器产生复位或处理中断事件。 典型工作电流为6μA/5V,2.6μA/3.3V,适合电池供电的仪器、设备，可对5V,3.3V和3V电源电压进行检测。 电池 微处理器 监控 |
| 文件： | 总5页 (文件大小：267K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HN809 / HN810
HN809 / HN810
3-Pin Microprocessor Reset Monitors
Product Description
The HN809/810 microprocessor supervisory circuits can be used to monitor the power supplies in microprocessor and
digital systems. They provide a reset to the microprocessor during power-up, power-down and brown-out conditions.
The function of the HN809/810 is to monitor the VCC supply voltage, and assert a reset signal whenever this voltage
declines below the factory-programmed reset threshold. The reset signal remains asserted until VCC has risen above
VRESET for a minimum period of time. The HN809 has an active-low
RESET output.
output, while the HN810 has an active-high
RESET
Seven standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 3V supply voltages.
With a low supply current of only 15ȝA, the HN809/810 are ideal for use in portable equipment. The HN809/HN810 are
available in the 3-pin SOT23 package.
Features
Applications
yꢀMicroprocessor Systems
yꢀComputers
yꢀPrecise monitoring of 3V, 3.3V, and 5V supply voltages
yꢀSuperior upgrade to MAX809/810
yꢀFully specified over temperature
yꢀGuaranteed RESET Output valid for VCC1V
yꢀControllers
yꢀIntelligent Instruments
yꢀPortable/Battery-Powered Equipment
yꢀAutomotive
Active-low
Output (HN809)
RESET
Active-high RESET Output (HN810)
yꢀLow Supply Current.
yꢀPower supply transient immunity
Pin Configuration
Pin Descriptions
Pin No. Name
Pin Function
GND
1
1
GND Ground reference
Active-low output.
remains low while
RESET
RESET
V
CC is below the reset threshold, and for a
V
CC
3
(HN809) minimum period of time after VCC rises above the
reset threshold.
RESET
RESET
2
2
Active-high output. RESET remains high while
V
CC is below the reset threshold, and for a
RESET
SOT23-3
(HN810) minimum period of time after VCC rises above the
reset threshold.
(Top View)
NOTE: RESET is for HN809
RESET is for HN810
VCC
3
Supply Voltage (+5V, +3.3V, or +3.0V)
Order and Threshold Information
Typical Application Circuit
VTH (V)
HN809 Series HN810 Series
Package
V
CC
2.45
2.63
2.93
3.08
4.00
4.38
4.63
HN809M-2.45
HN809M-2.63
HN809M-2.93
HN809M-3.08
HN809M-4.00
HN809M-4.38
HN809M-4.63
HN810M-2.45
HN810M-2.63
HN810M-2.93
HN810M-3.08
HN810M-4.00
HN810M-4.38
HN810M-4.63
V
V
CC
PROCESSOR
CC
HN809/810
RESET
RESET
RESET
INPUT
SOT23-3
GND
GND
地址: 南京市珠江路 88 号，新世界中心 B 座 4004 室, 邮编:210008
ADD.: RM. 4004, BLOCK B, NEW WORLD CENTRE, NO. 88 ZHUJIANG ROAD, NANJING 210008, CHINA
电话(TEL.): (86)-25-68853600 传真(FAX): (86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
1
HN809 / HN810
Absolute Maximum Ratings (Note 1)
VCC
RESET,
------------------------------------------------------------------------------------------------------------- í0.3V to 7.0V
----------------------------------------------------------------------------------------------- í0.3V to (VCC+ 0.3V)
RESET
Input Current, VCC Pin
Output Current, RESET,
Continuous Power Dissipation (Note 3)
-------------------------------------------------------------------------------------- 20mA
Pin
---------------------------------------------------------------- 20mA
--------------------------------------------------------------- 320mW
RESET
©JA, SOT23-3
------------------------------------------------------------------------------------------------ 326°C/W
Ambient Temperature Range
Storage Temperature Range
------------------------------------------------------------------------- í40°C to +85°C
--------------------------------------------------------------------------- í55°C to +150°C
Lead Temperature (soldering, 10sec) ------------------------------------------------------------------ +300°C
Electrical Characteristics
VCC = full range, TA = í40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, VCC=5V for 4.63/4.38 versions, VCC
= 3.3V for 3.08/2.93 versions, and VCC = 3V for 2.63 version (Note 2).
Conditions
TA=0°C to +70°C
Symbol
Parameter
Min
1.00
1.20
Typ
Max
5.50
5.50
Units
VCC Range
V
TA=í40°C to +85°C
V
CC=5.5V, HN8_ _
15.00
10.00
-4.63/4.38/4.00
VCC=3.6V, HN8_ _
-3.08/2.93/2.63/2.45
ICC
TA=í40°C to 85°C
Supply Current
A
TA=+25°C
4.56
4.50
4.31
4.25
3.04
3.00
2.89
2.85
2.59
2.55
4.63
4.38
3.08
2.93
2.63
4.70
4.75
4.45
4.50
3.11
3.15
2.96
3.00
2.66
2.70
HN8_ _ -4.63
HN8_ _ -4.38
HN8_ _ -3.08
HN8_ _ -2.93
HN8_ _ -2.63
TA=í40°C to 85°C
TA=+25°C
TA=í40°C to 85°C
TA=+25°C
VTH
Reset Threshold (Note 4)
V
TA=í40°C to 85°C
TA=+25°C
TA=í40°C to 85°C
TA=+25°C
TA=í40°C to 85°C
Reset Threshold Temperature
Coefficient
45
20
ppm/°C
VCC =VTH to (VTH í 100mV)
VCC to Reset Delay (Note 4)
s
VCC =VTH min, ISINK = 1.2mA,
HN809-2.63/2.93/3.08
VCC =VTH min, ISINK =3.2mA,
HN809-4.63/4.38
0.3
VOL
RESETOutput Voltage Low (HN809)
V
V
0.4
0.3
V
CC >1.0V, ISINK =50A
VCC > VTH max, ISOURCE =500A,
0.8VCC
HN809-2.63/2.93/3.08
VCC > VTH max, ISOURCE =800A,
HN809-4.63/4.38
VOH
Output Voltage High (HN809)
RESET
VCCí1.5
VCC =VTH max, ISINK =1.2mA,
HN810-2.63/2.93/3.08
VCC =VTH max, ISINK =3.2mA,
HN810-4.63/4.38
0.3
0.4
V
V
VOL
VOH
RESET Output Voltage Low (HN810)
RESET Output Voltage High (HN810)
1.8V < VCC < VTH min, ISOURCE =150A
0.8VCC
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which the device operates
correctly. Operating ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics.
Note 2: Production testing done at TA = +25°C, over temperature limits guaranteed by design only.
Note 3: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the SOT23-3 package must be derated at 4mW/°C
at ambient temperatures above 70°C. The device has internal thermal protection.
Note 4: Output for HN809, RESET output for HN810.
RESET
地址: 南京市珠江路 88 号，新世界中心 B 座 4004 室, 邮编:210008
ADD.: RM. 4004, BLOCK B, NEW WORLD CENTRE, NO. 88 ZHUJIANG ROAD, NANJING 210008, CHINA
电话(TEL.): (86)-25-68853600 传真(FAX): (86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
2
HN809 / HN810
Typical Performance Characteristics
Supply Current vs. Temperature
Reset Threshold vs. Temperature
(HN809-2.93)
8,0
2,95
2,94
2,93
2,92
2,91
2,90
Vcc=5.5V
7,0
6,0
Vcc=3.6V
5,0
4,0
3,0
-40
85
-40
0
20
40
60
85
-20
0
20
40
60
-20
Temperature (ć)
Temperature (ć)
Output High Voltage vs. Temperature
RESET
RESET Output Low Voltage vs. Temperature
(VCC=3,3V, IOH=500μA)
(VCC=2,85V, IOL=1,2mA)
3,23
3,22
3,21
3,20
3,19
3,18
0,05
0,04
0,03
0,02
0,01
0
-40
-20
0
20
40
60
85
-40
-20
0
20
40
60
85
Temperature (ć)
Temperature (ć)
地址: 南京市珠江路 88 号，新世界中心 B 座 4004 室, 邮编:210008
ADD.: RM. 4004, BLOCK B, NEW WORLD CENTRE, NO. 88 ZHUJIANG ROAD, NANJING 210008, CHINA
电话(TEL.): (86)-25-68853600 传真(FAX): (86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
3
HN809 / HN810
Applications Information
Benefits of Precision Reset Thresholds
A microprocessor supply supervisor must provide a reset output within a predictable range of the supply voltage. A
common threshold range is between 5% and 10% below the nominal supply voltage. The 4.63V and 3.08V options of
the HN809/810 use highly accurate circuitry to ensure that the reset threshold occurs only within this range (for 5V and
3.3V supplies). The other voltage options have the same tight tolerance to ensure a reset signal for other narrow
monitor ranges. See Table 1 for examples of how the standard reset thresholds apply to 3V, 3.3V, and 5V nominal
supply voltages.
TABLE 1. Reset Thresholds Related to Common
Supply Voltages
Reset
Threshold
HN809
3.0V
3.3V
5.0V
4.63 3%
4.38 3%
3.08 3%
2.93 3%
2.63 3%
90 -95%
85 -90%
90 -95%
86 -90%
77 -81%
85 -90%
FIGURE 1. RESET Valid to VCC = Ground Circuit
Ensuring a Valid Reset Output Down to VCC = 0V
When VCC falls below 1V, the HN809 output no longer sinks current. A high-impedance CMOS logic input
RESET
can therefore drift to undetermined voltages. To prevent this situation, a 100kǂresistor should be
connected to
RESET
Ω
connected from the
output to ground, as shown in Figure 1.
RESET
A 100k¡pull-up resistor to VCC is also recommended for the HN810, if RESET is required to remain valid for VCC < 1V.
HN8_ _-2.63/2.93/3.08
HN8_ _-4.38/4.63
HN809
FIGURE 2. Maximum Transient Duration without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
FIGURE 3. Interfacing to Microprocessors with
Bidirectional Reset I/O
Negative-Going VCC Transients
The HN809/810 are relatively immune to short negative-going transients or glitches on VCC. Figure 2 shows the
maximum pulse width a negative-going VCC transient can have without causing a reset pulse. In general, as the
magnitude of the transient increases, going further below the threshold, the maximum allowable pulse width decreases.
Typically, for the 4.63V and 4.38V version of the HN809/810, a VCC transient that goes 100mV below the reset threshold
and lasts 20ȝs or less will not cause a reset pulse. A 0.1 ȝF bypass capacitor mounted as close as possible to the VCC
pin will provide additional transient rejection.
Interfacing to ȝPs with Bidirectional Reset Pins
Microprocessors with bidirectional reset pins, such as the Motorola 68HC11 series, can be connected to the HN809
output. To ensure a correct output on the HN809 even when the microprocessor reset pin is in the opposite
RESET
state, connect a 4.7k¡resistor between the HN809
output and the ȝP reset pin, as shown in Figure 3. Buffer
RESET
output to other system components.
the HN809
RESET
地址: 南京市珠江路 88 号，新世界中心 B 座 4004 室, 邮编:210008
ADD.: RM. 4004, BLOCK B, NEW WORLD CENTRE, NO. 88 ZHUJIANG ROAD, NANJING 210008, CHINA
电话(TEL.): (86)-25-68853600 传真(FAX): (86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
4
HN809 / HN810
Physical Dimensions inches (millimeters) unless otherwise noted
3-Lead SOT23-3
For Ordering, refer to Ordering Information table
地址: 南京市珠江路 88 号，新世界中心 B 座 4004 室, 邮编:210008
ADD.: RM. 4004, BLOCK B, NEW WORLD CENTRE, NO. 88 ZHUJIANG ROAD, NANJING 210008, CHINA
电话(TEL.): (86)-25-68853600 传真(FAX): (86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
5
相关型号：
HN809 810
(低电平)复位逻辑输出。在电源上电、掉电以及监控系统电源电压的变化，产生可靠的电源复位信号，使微处理器产生复位或处理中断事件。 典型工作电流为6μA/5V,2.6μA/3.3V,适合电池供电的仪器、设备，可对5V,3.3V和3V电源电压进行检测。
HN
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