ZXCM209LF [ETC]
Voltage Detector ; 电压检测器\n
| 型号： | ZXCM209LF |
| 厂家： | 
ETC |
| 描述： | Voltage Detector
|
| 文件： | 总8页 (文件大小：331K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ZXCM209
ZXCM210
VERY LOW POWER MICROPROCESSOR RESET DEVICES
DESCRIPTION
APPLICATIONS
The ZXCM209/210 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
ZXCM209 has an active-low RESET output (which is
guaranteed to be in the correct state for supplies down
to 1V), while the ZXCM210 has an active-high RESET
output.
Portable/Battery-powered equipment
Automotive
APPLICATION CIRCUIT
vcc
The reset comparator has in built hysteresis to prevent
erratic operation and is designed to ignore supply
transients. Low supply current (typically 2µA) makes
the ZXCM209/210 devices ideal for use in portable
equipment. They are available in a 3-pin SOT23
surface mount package with an industry standard
pinout.
vcc
vcc
ZXCM
Micro
Reset
Output
Reset
Input
FEATURES
•
Enhanced alternative to MAX809/810 and similar
parts
Gnd
Gnd
•
Precision monitoring of 5V, 3.3V, 3V power
supply voltages
•
•
•
•
1% threshold tolerance
2µA typical supply current
140ms minimum power on reset pulse width
Alternative minimum pulse widths available,
contact your local sales office for availability
•
•
•
•
•
RESET LOW Output (ZXCM209)
RESET HIGH Output (ZXCM210)
Power supply transient immunity
No latch up
No external components
•
3-Pin SOT23 package
ISSUE 3 - FEBRUARY 2001
1
ZXCM209
ZXCM210
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage with respect to GND
VCC
-0.3V to 7.0V
RESET, RESET
Input Current, VCC
-0.3V to (VCC + 0.3V)
20mA
Output Current
20mA
Rate of Rise, VCC
250V/µs
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, TA = -55°C to +125°C
SYMBOL
PARAMETER
CONDITIONS
LIMITS
UNITS
MIN TYP
MAX
V
I
V
Range
T =0° to 70°C
A
1.0
1.2
5.5
5.5
V
V
R
CC
A
T =-55° to 125°C
Supply Current
Reset Threshold
2
5
µA
V
CC
V
Suffix L; T =25°C
4.58 4.63
4.34 4.38
3.96 4.00
3.05 3.08
2.90 2.93
2.60 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 =25°C
%
%
THT
A
T =-55° to 125°C
5
A
Reset Threshold Temp.
Coefficient
50
ppm/°C
∆V /°C
TH
V
D
V
to Reset Delay
30
µs
CC
V
Reset Active Timeout
Period
140
560
ms
TO
ISSUE 3 - FEBUARY 2001
2
ZXCM209
ZXCM210
ELECTRICAL CHARACTERISTICS ZXCM209
TEST CONDITIONS (unless otherwise stated) VCC = full range, TA = -55°C to +125°C
SYMBOL
PARAMETER
CONDITIONS
LIMITS
MIN
UNITS
TYP MAX
V
Reset Output Voltage
Low
0.3
0.3
0.4
V
V
V
V
V
V
V
CC>1V, IOL=100µA (0 to 85°C)
CC>1.2V, IOL=200µA
OL
TH>VCC>2.5V, IOL=2.7mA
V
Reset Output Voltage
High
0.8V
cc
V
CC>VTHmax, IOH=1mA
OH
ELECTRICAL CHARACTERISTICS ZXCM210
TEST CONDITIONS (unless otherwise stated) VCC = full range, TA = -55°C to +125°C
SYMBOL
PARAMETER
CONDITIONS
LIMITS
MIN
UNITS
TYP MAX
V
Reset Output Voltage
Low
0.3
0.4
V
V
V
V
V
V
V
V
CC>VTHmax, IOL=2mA
CC>VTHmax, IOL=2.7mA
CC>1.5V, IOH=150µA
OL
V
Reset Output Voltage
High
0.8V
cc
OH
0.8V
cc
CC>VTH>2.5V, IOH=1mA
Note: Device testing is performed at TA=25°C. Device thermal performance is guaranteed by design
TYPICAL CHARACTERISTICS
ISSUE 3 - FEBRUARY 2001
3
ZXCM209
ZXCM210
TYPICAL CHARACTERISTICS
ISSUE 3 - FEBUARY 2001
4
ZXCM209
ZXCM210
APPLICATIONS INFORMATION
Negative going VCC transients
Reset valid down to very low supply voltages
The ZXCM209/210 are, to a good degree, immune to
short duration negative going supply transients. Under
certain circumstances very brief transients are allowed
without inappropriate false triggering of the reset
circuit. The response to supply transients is shown in the
Noise Immunity graph in the typical characteristics. The
graph indicates the typical allowable transient duration
for a specified threshold overdrive such that a reset
pulse is not generated. Addition of a bypass capacitor,
e.g. 0.1µF, as close as possible to the VCC pin will provide
extra transient immunity.
With VCC between 0V and 1V the output of the
ZXCM209/210 may be in an undefined state. In many
systems this is inconsequential as the
microprocessor, and other circuits, will be inoperative
with supplies this low. In applications where this is
important, the addition of an external resistor ensures
that the reset output remains valid for VCC < 1V. The
resistor value is non critical: a value of 100kΩ is
recommended. For the ZXCM209 the resistor should
be applied between reset output and ground: for the
ZXCM210 between reset output and VCC. Figure 1
shows the connection diagram for the ZXCM devices
in these configurations.
vcc
vcc
vcc
vcc
vcc
vcc
100k
ZXCM209
Micro
ZXCM210
Micro
Reset
Output
Reset
Input
Reset
Output
Reset
Input
Gnd
Gnd
Gnd
Gnd
100k
Figure 1
Circuit for operation of ZXCM with reset valid down to very low supply voltage.
ISSUE 3 - FEBRUARY 2001
5
ZXCM209
ZXCM210
Interfacing to µP’s with bidirectional reset I/O
The ZXCM series can be used with microprocessors operation of the reset circuit. A buffer to other circuit
havng bidirectional reset pins, such as Motorola 68HC11 components is then required to enable the processor
series. The addition of a 4.7k resistor between the ZXCM reset drive to operate correctly. The circuit
reset output and the processor input ensures correct
configuration is shown in Figure 2.
vcc
to other
circuits
vcc
vcc
ZXCM
Micro
Reset
Output
4.7kΩ
Reset
Input
Gnd
Gnd
Figure 2
Interfacing to µP’s with bidirectional reset I/O.
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
(ZXCM209)
RESET
Output remains high while V
is below the reset threshold, and for a
CC
minimum 140ms after V
Ground
rises above the reset threshold.
CC
(ZXCM210)
Gnd
3
3
1
2
ISSUE 3 - FEBUARY 2001
6
ZXCM209
ZXCM210
ORDERING INFORMATION
PART NUMBER
ZXCM209xF
ZXCM210LF
TEMPERATURE RANGE
PACKAGE
SOT23
RESET OUTPUT
LOW
-55 to 125°C
-55 to 125°C
SOT23
HIGH
x=Insert appropriate threshold voltage code.
ZXCM209 Threshold voltage codes
PART MARK
THRESHOLD
CODE
RESET
THRESHOLD (V)
M22
M23
M24
M25
M26
M27
L
4.63
4.38
4.00
3.08
2.93
2.63
M
J
T
S
R
ZXCM210 Threshold voltage codes
PART MARK
THRESHOLD
CODE
RESET
THRESHOLD (V)
M28
L
4.63
The only Reset High variant currently available is the ZXCM210LF. Contact your local Zetex Office for more
details.
ISSUE 3 - FEBRUARY 2001
7
ZXCM209
ZXCM210
PACKAGE DIMENSIONS
PAD LAYOUT DETAILS
DIM Millimetres
Inches
Min
Min
Max
3.05
1.40
1.10
0.53
0.15
Max
A
B
C
D
F
2.67
0.105
0.120
0.055
0.043
0.021
0.0059
1.20
0.047
–
–
0.37
0.0145
0.0033
NOM 0.075
0.0004
0.0825
NOM 0.037
0.085
NOM 1.9
0.01
G
K
L
0.10
2.50
0.004
2.10
0.0985
N
NOM 0.95
Zetex plc.
Fields New Road, Chadderton, Oldham, OL9-8NP, United Kingdom.
Telephone: (44)161 622 4422 (Sales), (44)161 622 4444 (General Enquiries)
Fax: (44)161 622 4420
Zetex GmbH
Zetex Inc.
Zetex (Asia) Ltd.
3701-04 Metroplaza, Tower 1
Hing Fong Road,
Kwai Fong, Hong Kong
Telephone:(852) 26100 611
Fax: (852) 24250 494
These are supported by
agents and distributors in
major countries world-wide
© Zetex plc 2001
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
47 Mall Drive, Unit 4
Commack NY 11725
USA
Telephone: (631) 543-7100
Fax: (631) 864-7630
www.zetex.com
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.
ISSUE 3 - FEBUARY 2001
8
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