ZXCM810LF [DIODES]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN;
| 型号： | ZXCM810LF |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN 光电二极管 |
| 文件： | 总8页 (文件大小：494K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ZXCM809
ZXCM810
VERY LOW POWER MICROPROCESSOR RESET DEVICES
DESCRIPTION
APPLICATIONS
The ZXCM809/810 are three terminal supervisory
circuits used to monitor the power supplies in
microprocessor and digital systems. They provide a
high performance economical solution when used
with 5V, 3V or lower powered circuits. Reset thresholds
suitable for operation with a variety of supply voltages
are available.
•
Computer systems
Controllers
•
•
•
•
•
•
•
Instrumentation
Microprocessor power monitoring
Microcontroller power monitoring
Power supplies
These devices provide a reset signal whenever the
supply voltage falls below a preset threshold, keeping
it asserted for a minimum delay period of 140ms after
the supply has risen above the reset level. The
ZXCM809 has an active-low RESET output (which is
guaranteed to be in the correct state for supplies down
to 1V), while the ZXCM810 has an active-high RESET
output.
Portable/Battery-powered equipment
Automotive
The reset comparator has in built hysteresis to prevent
erratic operation and is designed to ignore supply
transients. Low supply current (typically 2A) makes
the ZXCM809/810 devices ideal for use in portable
equipment. They are available in a 3-pin SOT23 surface
mount package with an industry standard pinout.
APPLICATION CIRCUIT
vcc
FEATURES
•
Enhanced alternative to MAX809/810 and similar
parts
vcc
vcc
•
Precision monitoring of 5V, 3.3V, 3V power supply
voltages
ZXCM
Micro
Reset
Output
Reset
Input
•
•
•
•
•
•
•
•
•
•
1% threshold tolerance
2µA typical supply current
140ms minimum power on reset pulse width
RESET LOW Output (ZXCM809)
RESET HIGH Output (ZXCM810)
Push - Pull CMOS Output
Power supply transient immunity
No latch up
Gnd
Gnd
No external components
3-Pin SOT23 package
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1
ZXCM809
ZXCM810
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage with respect to G
ND
V
-0.3V to 7.0V
CC
RESET, RESET
Input Current, V
Output Current
-0.3V to (V + 0.3V)
CC
20mA
CC
20mA
Rate of Rise, V
250V/s
CC
Continuous Power Dissipation
Operating Temperature Range
Storage Temperature Range
500mW
-55°C to +125°C
-65°C to +150°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum
conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (unless otherwise stated) VCC = full range, T = -55°C to +125°C
A
SYMBOL
PARAMETER
CONDITIONS
LIMITS
TYP
UNITS
MIN
MAX
V
V
Range
T
T
=0° to 70°C
=-55° to 125°C
1.0
1.2
5.5
5.5
V
V
R
CC
A
A
I
Supply Current
Reset Threshold
2
5
A
V
CC
V
Suffix L; T =25°C
4.58
4.34
3.96
3.05
2.90
2.60
4.63
4.38
4.00
3.08
2.93
2.63
1
4.68
4.42
4.04
3.11
2.96
2.66
TH
A
Suffix M; T =25°C
V
A
Suffix J; T =25°C
V
A
Suffix T; T =25°C
V
A
Suffix S; T =25°C
V
A
Suffix R; T =25°C
V
A
V
Reset Threshold
Tolerance
T
T
=25°C
=-55° to 125°C
%
%
THT
A
A
5
Reset Threshold Temp.
Coefficient
50
30
ppm/°C
⌬V /°C
TH
V
V
V
to Reset Delay
CC
s
D
Reset Active Timeout
Period
140
560
ms
TO
ISSUE 2 - JANUARY 2003
2
ZXCM809
ZXCM810
ELECTRICAL CHARACTERISTICS ZXCM809
TEST CONDITIONS (unless otherwise stated) V = full range, T = -55°C to +125°C
CC
A
SYMBOL
PARAMETER
CONDITIONS
LIMITS
TYP
UNITS
MIN
MAX
0.3
V
Reset Output Voltage
Low
V
V
V
V
V
V
V
>1V, I =100A (0 to 85°C)
OL
OL
CC
CC
TH
0.3
>1.2V, I =200A
OL
0.4
>V >2.5V, I =2.7mA
CC
OL
V
Reset Output Voltage
High
0.8V
CC
V
>V max, I =1mA
TH OH
OH
CC
ELECTRICAL CHARACTERISTICS ZXCM810
TEST CONDITIONS (unless otherwise stated) V = full range, T = -55°C to +125°C
CC
A
SYMBOL
PARAMETER
CONDITIONS
LIMITS
TYP
UNITS
MIN
MAX
0.3
V
Reset Output Voltage
Low
V
V
V
V
V
V
V
V
>V max, I =2mA
TH OL
OL
CC
CC
CC
CC
0.4
>V max, I =2.7mA
TH
OL
V
Reset Output Voltage
High
0.8V
>1.5V, I =150A
OH
OH
CC
CC
0.8V
>V >2.5V, I =1mA
TH
OH
Note: Device testing is performed at T =25°C. Device thermal performance is guaranteed by design
A
TYPICAL CHARACTERISTICS
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ZXCM809
ZXCM810
TYPICAL APPLICATIONS
ISSUE 2 - JANUARY 2003
4
ZXCM809
ZXCM810
APPLICATIONS INFORMATION
Negative going V transients
CC
Reset valid down to very low supply voltages
The ZXCM809/810 are, to a good degree, immune to With V
between 0V and 1V the output of the
CC
short duration negative going supply transients. Under ZXCM809/810 may be in an undefined state. In many
certain circumstances very brief transients are allowed systems this is inconsequential as the microprocessor,
without inappropriate false triggering of the reset and other circuits, will be inoperative with supplies this
circuit. The response to supply transients is shown in low. In applications where this is important, the
the Noise Immunity graph in the typical characteristics. addition of an external resistor ensures that the reset
The graph indicates the typical allowable transient output remains valid for V < 1V. The resistor value is
CC
duration for a specified threshold overdrive such that a non critical: a value of 100k⍀ is recommended. For the
reset pulse is not generated. Addition of a bypass ZXCM809 the resistor should be applied between reset
capacitor, e.g. 0.1F, as close as possible to the V pin output and ground: for the ZXCM810 between reset
CC
will provide extra transient immunity.
output and V . Figure 1 shows the connection
CC
diagramfortheZXCMdevicesintheseconfigurations.
Figure 1
Circuit for operation of ZXCM with reset valid down to very low supply voltage.
ISSUE 2 - JANUARY 2003
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ZXCM809
ZXCM810
Interfacing to P’s with bidirectional reset I/O
The ZXCM series can be used with microprocessors havng bidirectional reset pins, such as Motorola 68HC11
series. The addition of a 4.7k resistor between the ZXCM reset output and the processor input ensures correct
operation of the reset circuit. A buffer to other circuit components is then required to enable the processor reset
drive to operate correctly. The circuit configuration is shown in Figure 2.
vcc
to other
circuits
vcc
vcc
ZXCM
Micro
Reset
Output
Reset
Input
4.7kΩ
Gnd
Gnd
Figure 2
Interfacing to P’s with bidirectional reset I/O.
3
1
2
PIN DESCRIPTION
Pin Number Pin Name
Pin Function
1
2
V
Supply voltage (+5, +3.3, +3 volts)
CC
RESET
Output remains low while Vcc is below the reset threshold, and for a
minimum 140ms after V rises above the reset threshold.
CC
Output remains high while V
(ZXCM809)
RESET
is below the reset threshold, and for a
CC
rises above the reset threshold.
minimum 140ms after V
Ground
CC
(ZXCM810)
Gnd
3
ISSUE 2 - JANUARY 2003
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ZXCM809
ZXCM810
ORDERING INFORMATION
PART NUMBER
ZXCM809xF
ZXCM810LF
TEMPERATURE RANGE
PACKAGE
SOT23
RESET OUTPUT
-55 to 125°C
-55 to 125°C
LOW
HIGH
SOT23
x=Insert appropriate threshold voltage code.
ZXCM809 Threshold voltage codes
PART MARK
THRESHOLD
CODE
RESET THRESHOLD
(V)
M22
M23
M24
M25
M26
M27
L
M
J
4.63
4.38
4.00
3.08
2.93
2.63
T
S
R
ZXCM810 Threshold voltage codes
PART MARK
THRESHOLD
CODE
RESET THRESHOLD
(V)
M28
L
4.63
The only Reset High variant currently available is the ZXCM810LF. Contact your local Zetex Office for more
details.
ISSUE 2 - JANUARY 2003
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ZXCM809
ZXCM810
PACKAGE OUTLINE
PAD LAYOUT
PACKAGE DIMENSIONS
MILLIMETRES
MILLIMETRES
DIM
DIM
MIN
2.67
1.20
ᎏ
MAX
3.05
1.40
1.10
0.53
0.15
MIN
0.33
0.01
2.10
0.45
MAX
0.51
0.10
2.50
0.64
A
B
C
D
F
H
K
L
0.37
0.085
M
N
0.95 NOM
G
1.90 NOM
10Њ TYP
© Zetex plc 2002
Zetex plc
Fields New Road
Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4422
Fax: (44) 161 622 4420
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY11788
Zetex (Asia) Ltd
3701-04 Metroplaza, Tower 1
Hing Fong Road
Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
USA
Telephone: (631) 360 2222
Fax: (631) 360 8222
These offices are supported by agents and distributors in major countries world-wide.
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced
for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company
reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
For the latest product information, log on to www.zetex.com
ISSUE 2 - JANUARY 2003
8
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