ZXCM210RF [ETC]
Analog IC ; 模拟IC\n
ETC 
ZXCM209
ZXCM210
VERY LOW POWER MICROPROCESSOR RESET DEVICES
DESCRIPTION
APPLICATIONS
The ZXCM209/210 are three term inal supervisory
circuits used to m onitor the power supplies in
m icroprocessor and digital system s. They provide a
high perform ance econom ical solution when used
w ith 5V, 3V o r lo w e r p o w e re d circu its . Re s e t
thresholds suitable for operation with a variety of
supply voltages are available.
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•
•
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Com puter system s
Controllers
Instrum entation
Microprocessor power m onitoring
Microcontroller power m onitoring
Power supplies
These devices provide a reset signal whenever the
supply voltage falls below a preset threshold, keeping
it asserted for a m inim um delay period of 140m s 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 equipm ent
Autom otive
APPLICATION CIRCUIT
vcc
The reset com parator has in built hysteresis to prevent
erratic operation and is designed to ignore supply
transients. Low supply current (typically 2µA) m akes
the ZXCM209/210 devices ideal for use in portable
equipm ent. They are available in a 3-pin SOT23
surface m ount package with an industry standard
pinout.
vcc
vcc
ZXCM
Micro
Reset
Output
Reset
Input
FEATURES
•
Enhanced alternative to MAX809/810 and sim ilar
parts
Gnd
Gnd
•
Precision m onitoring of 5V, 3.3V, 3V power
supply voltages
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1% threshold tolerance
2µA typical supply current
140m s m inim um power on reset pulse width
Alternative m inim um pulse widths available,
contact your local sales office for availability
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RESET LOW Output (ZXCM209)
RESET HIGH Output (ZXCM210)
Power supply transient im m unity
No latch up
No external com ponents
•
3-Pin SOT23 package
ISSUE 2 - MARCH 2000
1
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ZXCM209
ZXCM210
ABSOLUTE MAXIMUM RATINGS
Term inal Voltage with respect to GND
VCC
-0.3V to 7.0V
RESET, RESET
Input Current, VCC
Output Current
-0.3V to (VCC + 0.3V)
20m A
20m A
Rate of Rise, VCC
250V/µs
Continuous Power Dissipation
Operating Tem perature Range
Storage Tem perature Range
500m W
-55°C to +125°C
-65°C to +150°C
Stresses beyond those listed under “Absolute Maxim um Ratings” m ay cause perm anent dam age 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 im plied. Exposure to absolute m axim um
conditions for extended periods m ay affect device reliability.
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (unless otherwise stated) VCC = full range, TA = -55°C to +125°C
S YMBOL
PARAMETER
CONDITIONS
LIMITS
UNITS
MIN TYP
MAX
V
I
V
Ra n g e
T =0° to 70°C
1.0
1.2
5.5
5.5
V
V
R
CC
A
T =-55° to 125°C
A
S u p p ly Cu rre n t
Re s e t Th re s h o ld
2
5
µA
V
CC
V
S u ffix 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
S u ffix M; T =25°C
V
A
S u ffix J ; T =25°C
V
A
S u ffix T; T =25°C
V
A
S u ffix S ; T =25°C
V
A
S u ffix R; T =25°C
V
A
V
Re s e t Th re s h o ld
To le ra n ce
T =25°C
%
%
THT
A
T =-55° to 125°C
5
A
Re s e t Th re s h o ld Te m p .
Co e fficie n t
50
p p m /°C
∆V /°C
TH
V
D
V
to Re s e t De la y
30
µs
CC
V
Re s e t Active Tim e o u t
Pe rio d
140
560
m s
TO
ISSUE 2 - MARCH 2000
2
ZXCM209
ZXCM210
ELECTRICAL CHARACTERISTICS ZXCM209
TEST CONDITIONS (unless otherw ise stated) VCC = full range, TA = -55°C to +125°C
S YMBOL
PARAMETER
CONDITIONS
LIMITS
MIN
UNITS
TYP MAX
V
Re s e t Ou tp u t Vo lta g e
Lo w
0.3
0.3
0.4
V
V
V
V
V
V
V
CC>1V, IOL=100µA (0 to 85°C)
OL
CC>1.2V, IOL=200µA
TH>VCC>2.5V, IOL=2.7m A
V
Re s e t Ou tp u t Vo lta g e
Hig h
0.8V
cc
V
CC>VTHm a x, IOH=1m A
OH
ELECTRICAL CHARACTERISTICS ZXCM210
TEST CONDITIONS (unless otherw ise stated) VCC = full range, TA = -55°C to +125°C
S YMBOL
PARAMETER
CONDITIONS
LIMITS
MIN
UNITS
TYP MAX
V
Re s e t Ou tp u t Vo lta g e
Lo w
0.3
0.4
V
V
V
V
V
V
V
V
CC>VTHm a x, IOL=2m A
CC>VTHm a x, IOL=2.7m A
CC>1.5V, IOH=150µA
OL
V
Re s e t Ou tp u t Vo lta g e
Hig h
0.8V
cc
OH
0.8V
cc
TH>VCC>2.5V, IOH=1m A
Note: Device testing is perform ed at TA=25°C. Device therm al perform ance is guaranteed by design
TYPICAL CHARACTERISTICS
ISSUE 2 - MARCH 2000
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ZXCM209
ZXCM210
TYPICAL CHARACTERISTICS
ISSUE 2 - MARCH 2000
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, im m une to
short duration negative going supply transients. Under
certain circum stances very brief transients are allowed
without inappropriate false triggering of the reset
circuit. The response to supply transients is shown in the
Noise Im m unity 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 im m unity.
With VCC between 0V and 1V the output of the
ZXCM209/210 m ay be in an undefined state. In m any
s y s t e m s t h is is in c o n s e q u e n t ia l a s t h e
m icroprocessor, and other circuits, will be inoperative
with supplies this low. In applications where this is
im portant, the addition of an external resistor ensures
that the reset output rem ains valid for VCC < 1V. The
resistor value is non critical: a value of 100kΩ is
recom m ended. 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 w ith reset valid dow n to very low supply voltage.
ISSUE 2 - MARCH 2000
5
ZXCM209
ZXCM210
Interfacing to µP’s w ith bidirectional reset I/ O
The ZXCM series can be used with m icroprocessors operation of the reset circuit. A buffer to other circuit
havng bidirectional reset pins, such as Motorola 68HC11 com ponents is then required to enable the processor
series. The addition of a 4.7k resistor between the ZXCM re s e t d rive to o p e ra te co rre ctly. Th e circu it
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 w ith bidirectional reset I/ O.
PIN DESCRIPTION
Pin
Pin Na m e
Pin Fu n ctio n
Nu m b e r
1
2
V
S u p p ly vo lta g e (+5, +3.3, +3 vo lts )
CC
RES ET
Ou tp u t re m a in s lo w w h ile Vcc is b e lo w th e re s e t th re s h o ld , a n d fo r a
m in im u m 140m s a fte r V ris e s a b o ve th e re s e t th re s h o ld .
CC
(ZXCM209)
RES ET
Ou tp u t re m a in s h ig h w h ile V is b e lo w th e re s e t th re s h o ld , a n d fo r a
CC
m in im u m 140m s a fte r V ris e s a b o ve th e re s e t th re s h o ld .
CC
(ZXCM210)
Gn d
3
Gro u n d
3
1
2
ISSUE 2 - MARCH 2000
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ZXCM209
ZXCM210
ORDERING INFORMATION
PART NUMBER
ZXCM209xF
ZXCM210xF
TEMPERATURE RANGE
PACKAGE
S OT23
RES ET OUTPUT
LOW
-55 to 125°C
-55 to 125°C
S OT23
HIGH
x=Insert appropriate threshold voltage code.
ZXCM209 Threshold voltage codes
PART MARK
THRES HOLD
CODE
RES ET
THRES HOLD (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
ZXCM210 Threshold voltage codes
PART MARK
THRES HOLD
CODE
RES ET
THRES HOLD (V)
M28
M29
M30
M31
M32
M33
L
M
J
4.63
4.38
4.00
3.08
2.93
2.63
T
S
R
ISSUE 2 - MARCH 2000
7
ZXCM209
ZXCM210
PACKAGE DIMENSIONS
PAD LAYOUT DETAILS
DIM Millim e tre s
In ch e s
Min
Min
Ma x
3.05
1.40
1.10
0.53
0.15
Ma x
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
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ISSUE 2 - MARCH 2000
8
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