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UZXCM809TF

型号：

UZXCM809TF

品牌：

DIODES[ DIODES INCORPORATED ]

页数：

8 页

PDF大小：

494 K

下载PDF手册
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 2␮A) 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  
ISSUE 2 - JANUARY 2003  
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 =100␮A (0 to 85°C)  
OL  
OL  
CC  
CC  
TH  
0.3  
>1.2V, I =200␮A  
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 =150␮A  
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  
ISSUE 2 - JANUARY 2003  
3
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. 0.1␮F, 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  
5
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  
6
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  
7
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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