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BL8509C
Low Voltage Detector With Built-in Delay Circuit
DESCRIPTION
FEATURES
BL8509C is a series of high precision voltage
detector with ultra-low current consumption
(4.5uA typ. at Vin=3.0V) and a built-in delay
circuit. It can work at very low voltage, which
makes it perfect for system reset.





BL8509C is composed of high precision voltage
reference, comparator, delay circuit, output
driver and resistor array. Internally preset detect
voltage has a low temperature drift and requires
no external trimming. Only CMOS type is
available.

High-Precision Detection Voltage： 3%
Detection Voltage：2.63V and 2.93V
Built-in Power on Reset Delay time circuit:
Refer to Selection Guide
Operating Voltage Range:1.2V~6V
Ultra-low current consumption: 4.5uA typ. (at
Vin＝3.0V)
Output Forms: CMOS (Active Low)
APPLICATIONS

BL8509C is available in small size SOT-23-3
package which is Pb free.




Power monitor for portable equipment such
as PDA,DSC,Mobile phone,Notebook,MP3
CPU and Logic Circuit Reset
Battery Checker
Battery Back-up Circuit
Power Failure Detector
ELECTRICAL CHARACTERISTICS
TYPICAL APPLICATION
Detector threshold=2.63V
1.E-04
VIN
BL8509C
LC9008
Supply current (A)
VDD
VOUT
VSS
1.E-05
1.E-06
25℃
1.E-07
-40℃
70℃
1.E-08
0
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1
2
4
Input voltage (V)
6
BL8509C
ORDERING INFORMATION
PIN CONFIGURATION
Product Classification
BL8509C □
1□
2□
3□
4□
5□
6
Code
Marking
XXX: Detector
Voltage
D:Delay time
XXXDC D:200mS
Description
Temperature&Rohs:
C:-40~85C ,Pb Free Rohs Std.
Package type:
B3:SOT-23-3(A)
B3B:SOT-23-3(B)
Packing type:
TR:Tape&Reel (Standard)
Detector Voltage:
e.g. 263=2.63V
293=2.93V
Delay time:
D:200mS
Output forms:
C:CMOS
□1
□2
□3
□4
□5
□6
BL8509CCB3TR□□□
C:CMOS
Product Classification
BL8509CCB3BTR□□□
Marking
XXX: Detector
Voltage
D:Delay time
XXXDC
D:200mS
C:CMOS
Vss
VDD
Vout
Ground Pin
Supply Voltage Input
Voltage detection output pin
ABSOLUTE MAXIMUM RATING
Parameter
Value
Input Voltage
Output Voltage range
Maximum Output current
Ambient Temperature(Ta)
Power Dissipation
SOT-23-3
Storage Temperature(Ts)
Lead Temperature & Time
-0.3V-8V
-0.3V- 8V
70mA
-40C -85C
250mW
-40C -150C
260C,10S
Note:
Exceed these limits to damage to the device.
Exposure to absolute maximum rating conditions may affect device reliability.
RECOMMENDED WORK CONDITIONS
Item
Input Voltage Range
Ambient Temperature
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Min
Recommended
Max.
Unit
1.2
-40
25
6
85
V
C
2
BL8509C
ELECTRICAL CHARACTERISTICS
BL8509CCXXTR263DC/N（2.63V）
(Topt＝25℃,Unless otherwise specified.)
Symbol
-VDET
ISS
VDDH
VDDL
Parameter
Conditions
Detector Threshold
Current consumption
Maximum operating voltage
Minimum Operating voltage
IOUT
2.551
Reference data
Typ.
Max.
0.5
2.0
mA
Reference data
Min.
Typ.
Max.
Unit
1.0
2.63
4.5
2.709
10
10
Unit
V
uA
V
V
VDD=4.63V
Pch
VDS=-2.1V，VDD=4.5V
Output current
Min.
BL8509CCXXTR293DC/N（2.93V）
(Topt＝25℃,Unless otherwise specified.)
Symbol
-VDET
ISS
VDDH
VDDL
IOUT
Parameter
Conditions
Detector Threshold
Current consumption
Maximum operating voltage
Minimum Operating voltage
Output current
2.842
VDD=4.93V
Pch
VDS=-2.1V，VDD=4.5V
1.0
2.93
4.5
3.018
10
10
0.5
V
uA
V
V
2.0
mA
ELECTRICAL CHARACTERISTICS BY OUTPUT DELAY TIME
Part Number
Test Condition
BL8509CCXXTRXXXDC/N
VDD=1.0V to Vdet+1.0V
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3
Output Delay Time
Min.
Typ.
Max.
Unit
180
ms
200
220
BL8509C
BLOCK DIAGRAM
VDD
Vout
_
Delay
Time
circuit
+
Vref
Vss
N Channel Open Drain
VDD
_
Vref
Delay
Time
circuit
+
Vout
Vss
CMOS Output
FUNCTION DESCRIPTION
VDD
Ra
+
_
Vref
Delay
Vout
Rb
Vss
High precision low temperature co-efficiency reference voltage is applied to the negative input of a
comparator. Input voltage, divided by resistor array of Ra and Rb, is applied to the positive input of the
comparator. Output of the comparator passes a delay circuit and a series of buffer to drive the output
CMOS pair.
VDET =VREF*(1+Ra/Rb)
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4
BL8509C
Ⅰ
Ⅱ
Ⅳ
Ⅲ
B
Supply A
Voltage
VDD
Ⅴ
Detector Treshold(Vdet)
Release Voltage
Minimum
Operating Voltage
Vss
Output
Voltage
(Vout)
Tdelay
Vss
No.
I
II
III
IV
V
Operation status
Output status
VDD>Vdet
VDD drops below Vdet
VDD drops further below VDDL
VDD rises above VDDL
VDD rises above Vdet
Output voltage is equal to the supply voltage
Output voltage equals to GND level
Output voltage is undefined
Output voltage equals to GND level
Output voltage equals to supply voltage after Tdelay
TEST CIRCUITS
（1）Supply current test circuit
（2）Detector threshold test circuit
VDD
VIN
BL8509C
LC9008
BL8509C
VOUT
VOUT
VSS
（3）NCH Drive Output Current Test Circuit
（4）PCH Drive Output Current Test Circuit
VDS
VDD
VIN
LC9008
BL8509C
VSS
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VDD
VOUT
IOUT
VIN
VDS
LC9008
BL8509C
VSS
5
VOUT
IOUT
VDD - VDS
BL8509C
TYPICAL PERFORMANCE CHARACTERISTICS
1) Supply current VS. Input voltage
2) Detector Threshold VS. Temperature
Detector threshold=2.63V
Detector threshold=2.63V
2.74
1.E-05
Detector threshold (V)
Supply current (A)
1.E-04
1.E-06
25℃
1.E-07
-40℃
2.70
2.66
2.62
70℃
2.58
1.E-08
0
1
2
3
4
Input voltage (V)
5
-50
6
3）Nch Driver Output Current VS. VDS
-30
1.2E-02
3.E-02
1.0E-02
8.0E-03
6.0E-03
4.0E-03
VDD=2.0V
VDD=1.0V
2.0E-03
-40℃
25℃
70℃
3.E-02
2.E-02
2.E-02
1.E-02
0.E+00
0.0
0.5
1.0
1.5
VDS (V)
2.0
2.5
0
5）PCH Driver Output Current vs. Input Current
Detector threshold=2.63V
35
Output Current Iout (mA)
90
5.E-03
0.0E+00
Vsd=0.5
Vsd=1.0
Vsd=1.5
Vsd=2.0
20
15
10
5
0
0
70
Detector threshold=2.63V
4.E-02
Output Current Iout (A)
Output Current (A)
Detector threshold=2.63V
25
10
30
50
Temperature (℃)
4）NCH Driver Output Current vs. Input Voltage
1.4E-02
30
-10
1
2
3
4
5
6
7
Input Voltage Vin (V)
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6
1
2
Input Voltage Vin (V)
3
4
BL8509C
PACKAGE LINE
Package
SOT-23-3
Devices per reel
Package dimension：
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7
3000Pcs
Unit
mm