MAX6412UK25-T [MAXIM]
Analog IC ; 模拟IC\n
| 型号： | MAX6412UK25-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog IC
|
| 文件： | 总12页 (文件大小：180K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2336; Rev 0; 1/02
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
General Description
Features
The MAX6412–MAX6420 low-power microprocessor
supervisor circuits monitor system voltages from 1.6V to
5V. These devices are designed to assert a reset signal
o Monitor System Voltages from 1.6V to 5V
o Capacitor-Adjustable Reset Timeout Period
whenever the V supply voltage or RESET IN falls below
CC
o Manual Reset Input (MAX6412/MAX6413/MAX6414)
its reset threshold or the manual reset input is asserted.
The reset output remains asserted for the reset timeout
o Adjustable Reset Input Option
(MAX6415–MAX6420)
period after V
and RESET IN rise above the reset
CC
threshold and the manual reset input is deasserted. The
reset timeout is externally set by a capacitor to provide
more flexibility.
o Dual-Voltage Monitoring
(MAX6418/MAX6419/MAX6420)
o Low Quiescent Current (1.7µA typ)
The MAX6412/MAX6413/MAX6414 feature fixed thresholds
from 1.575V to 5V in approximately 100mV increments and
a manual reset input. The MAX6415/MAX6416/MAX6417
are offered with an adjustable reset input that can monitor
voltages down to 1.26V and the MAX6418/MAX6419/
MAX6420 are offered with one fixed input and one
adjustable input to monitor dual-voltage systems.
o 3 RESET Output Options
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
o Guaranteed Reset Valid to V
= 1V
CC
The MAX6412/MAX6415/MAX6418 have an active-low,
push-pull reset output. The MAX6413/MAX6416/
MAX6419 have an active-high, push-pull reset output
and the MAX6414/MAX6417/MAX6420 have an active-
low, open-drain reset output. All of these devices are
offered in a SOT23-5 package and are fully specified
from -40°C to +125°C.
o Power-Supply Transient Immunity
o Small SOT23-5 Packages
Ordering Information
PART
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
MAX6412UK_ _-T
MAX6413UK_ _-T
MAX6414UK_ _-T
MAX6415UK-T
MAX6416UK-T
MAX6417UK-T
MAX6418UK_ _-T
MAX6419UK_ _-T
MAX6420UK_ _-T
Applications
Automotive
Medical Equipment
Intelligent Instruments
Portable Equipment
Battery-Powered Computers/Controllers
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Note: The MAX6412/MAX6413/MAX6414 and MAX6418/
MAX6419/MAX6420 are available with factory-set V reset
CC
Computers
thresholds from 1.575V to 5.0V in approximately 0.1V incre-
ments. Insert the desired nominal reset threshold suffix (from
Table 1) into the blanks following the letters UK. There are 33
standard versions with a required order increment of 2500
pieces. Sample stock is generally held on standard versions
only (see Standard Versions Table). Required order increment is
10,000 pieces for nonstandard versions. Contact factory for
availability. All devices are available in tape-and-reel only.
Pin Configuration
TOP VIEW
RESET/RESET
GND
1
2
3
5
V
CC
MAX6412–
MAX6420
Typical Operating Circuit appears at end of data sheet.
Selector Guide appears at end of data sheet.
RESET IN (MR)
4
SRT
SOT23-5
( ) FOR THE MAX6412/MAX6413/MAX6414
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND
Continuous Power Dissipation (T = +70°C)
A
V
........................................................................-0.3V to +6.0V
5-Pin SOT23-5 (derate 7.1ꢀW/°C above +70°C) ........571ꢀW
Operating Teꢀperature Range .........................-40°C to +125°C
Junction Teꢀperature......................................................+150°C
Storage Teꢀperature Range.............................-65°C to +150°C
Lead Teꢀperature (soldering, 10s) .................................+300°C
CC
SRT, MR, RESET IN....................................-0.3V to (V
RESET, RESET (Push-Pull) .........................-0.3V to (V
RESET (Open-Drain) .............................................-0.3V to +6.0V
Input Current (All Pins) ..................................................... 20ꢀA
Output Current (RESET, RESET) ...................................... 20ꢀA
+ 0.3V)
+ 0.3V)
CC
CC
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 rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= 1V to 5.5V, T = T
A
to T
, unless otherwise specified. Typical values are at V
= 5V and T = +25°C.) (Note 1)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
Supply Voltage Range
V
1.0
V
CC
V
V
V
≤ 5.0V
≤ 3.3V
≤ 2.0V
2.7
2
4.5
CC
CC
CC
Supply Current
I
3.5
µA
V
CC
1.7
2.5
V
1.5%
V
2.5%
V
3.5%
-
V
+
TH
1.5%
+
TH
2.5%
+
TH
3.5%
TH
T
T
T
= +25°C
A
A
A
-
V
TH
V
Reset Threshold Accuracy
V
= 0°C to +125°C
= -40°C to 0°C
CC
TH
-
V
TH
Hysteresis
to Reset Delay
V
3 ✕ V
ꢀV
µs
HYST
TH
V
t
V falling at 1ꢀV/µs
CC
100
4.375
0.275
240
CC
RD
C
C
= 1500pF
= 0
3.35
5.40
SRT
SRT
SRT
Reset Tiꢀeout Period
t
RP
ꢀs
V
V
Raꢀp Current
I
V
V
V
V
V
V
V
V
V
= 0 to 0.65V; V = 1.6V to 5V
nA
V
SRT
SRT
RAMP
CC
Raꢀp Threshold
V
= 1.6V to 5V (V rising)
RAMP
0.65
33
TH-RAMP
CC
RAMP Threshold Hysteresis
falling threshold
ꢀV
RAMP
≥ 1.0V, I
= 50µA
0.3
0.3
0.4
CC
CC
CC
CC
CC
CC
SINK
SINK
SINK
RESET Output Voltage LOW
V
V
≥ 2.7V, I
≥ 4.5V, I
≥ 1.8V, I
= 1.2ꢀA
= 3.2ꢀA
OL
= 200µA
0.8 ✕ V
0.8 ✕ V
0.8 ✕ V
SOURCE
CC
CC
CC
RESET Output Voltage HIGH,
(Push-Pull)
V
≥ 2.25V, I
= 500µA
SOURCE
V
OH
≥ 4.5V, I
= 800µA
SOURCE
RESET Output Leakage Current,
(Open-Drain)
I
V
> V , reset not asserted
1.0
µA
LKG
CC
TH
V
V
V
V
≥ 1.0V, I
≥ 1.8V, I
≥ 2.7V, I
≥ 4.5V, I
= 1µA
0.8 ✕ V
0.8 ✕ V
0.8 ✕ V
0.8 ✕ V
CC
CC
CC
CC
SOURCE
SOURCE
SOURCE
SOURCE
CC
CC
CC
CC
= 150µA
= 500µA
= 800µA
RESET Output Voltage HIGH
V
V
OH
2
_______________________________________________________________________________________
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
ELECTRICAL CHARACTERISTICS (continued)
(V
= 1V to 5.5V, T = T
A
to T
, unless otherwise specified. Typical values are at V
= 5V and T = +25°C.) (Note 1)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
0.3
UNITS
V
V
V
≥ 1.8V, I
≥ 2.7V, I
≥ 4.5V, I
= 500µA
= 1.2ꢀA
= 3.2ꢀA
CC
CC
CC
SINK
SINK
SINK
RESET Output Voltage LOW
V
V
0.3
OL
0.4
RESET IN Leakage Current
RESET IN Threshold
10
nA
V
V
V
falling, V = 1.6V to 5.0V
CC
1.212
2.4
1.263
25
1.313
RST
RST
RESET IN Hysteresis
ꢀV
V
0.8
IL
V
V
> 4.0V
< 4.0V
CC
CC
V
IH
MR Input
V
V
0.3 ✕ V
CC
IL
V
0.7 ✕ V
IH
CC
MR Miniꢀuꢀ Pulse Width
MR Glitch Rejection
MR to RESET Delay
1
µs
ns
µs
kΩ
75
50
20
MR Pullup Resistance
Pull up to V
12
28
CC
Note 1: Devices production tested at +25°C. Over teꢀperature liꢀits are guaranteed by design.
Typical Operating Characteristics
(V
= 5V, C
= 1500pF, T = +25°C, unless otherwise noted.)
SRT A
CC
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
SUPPLY CURRENT vs.
TEMPERATURE
RESET TIMEOUT PERIOD vs. C
SRT
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4
3
2
1
10,000
1000
100
10
T
= +125°C
V
= 5V
A
CC
CC
CC
V
V
= 3.3V
= 1.8V
T
= +25°C
A
T
= -40°C
A
V
= 1V
CC
1
0
0
0.1
1
2
3
4
5
6
-50 -25
0
25
50
75 100 125
1000
100
0.001 0.01
0.1
1
10
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
C
(nF)
SRT
_______________________________________________________________________________________
3
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Typical Operating Characteristics (continued)
(V
= 5V, C
= 1500pF, T = +25°C, unless otherwise noted.)
CC
SRT
A
RESET TIMEOUT PERIOD
vs. TEMPERATURE
RESET TIMEOUT PERIOD
vs. TEMPERATURE
600
550
500
450
400
4.30
C
= 1500pF
C
= 0
SRT
SRT
4.25
4.20
4.15
4.10
4.05
350
300
250
200
-50 -25
0
25
75 100 125
-50 -25
0
25
50
75 100 125
50
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET IN THRESHOLD VOLTAGE
vs. TEMPERATURE
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
175
150
125
100
75
1.280
1.275
1.270
1.265
1.260
1.255
1.250
RESET OCCURS
ABOVE THE CURVE
50
25
V
= 3.0V
800
TH
0
-50 -25
0
25
50
75 100 125
0
200
400
600
1000
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE (mV)
4
_______________________________________________________________________________________
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Pin Description
PIN
MAX6412/
MAX6413/
MAX6414
MAX6415/
MAX6416/
MAX6417
MAX6418/
MAX6419/
MAX6420
NAME
FUNCTION
RESET changes froꢀ high to low whenever V
or RESET IN drops below
CC
the selected reset threshold voltage (V or V
ꢀanual reset is pulled low. RESET reꢀains low for the reset tiꢀeout period
, respectively) or
TH
RESET IN
RESET
after all reset conditions are deasserted and then goes high.
1
1
1
RESET changes froꢀ low to high whenever the V
or RESET IN drops
CC
below the selected reset threshold voltage (V or V
reset is pulled low. RESET reꢀains high for the reset tiꢀeout period after all
reset conditions are deasserted and then goes low.
) or ꢀanual
RESET IN
TH
RESET
GND
2
2
3
2
3
Ground
Reset Input. High-iꢀpedance input to the adjustable reset coꢀparator.
Connect RESET IN to the center point of an external resistor-divider
network to set the threshold of the externally ꢀonitored voltage. See Reset
Threshold section.
RESET
IN
—
Manual Reset Input. Pull this pin low to ꢀanually reset the device. Reset
reꢀains asserted for the reset tiꢀeout period after MR is released.
3
—
—
MR
Set Reset Tiꢀeout Input. Connect a capacitor between SRT and ground to
set the tiꢀeout period. Deterꢀine the period as follows:
4
5
4
5
4
5
SRT
t
RP
= (2.73 x 106) ✕ C
+ 275µs with t in seconds and C
in Farads.
SRT
SRT
RP
V
Supply Voltage and Input for Fixed-Threshold V Monitor
CC
CC
in a known state. The MAX6412–MAX6420 µP supervi-
sory circuits provide the reset logic to prevent code-
execution errors during power-up, power-down, and
brownout conditions (see Typical Operating Circuit).
Detailed Description
The MAX6412–MAX6420 low-power ꢀicroprocessor
(µP) supervisory circuits provide ꢀaxiꢀuꢀ adjustability
for supply-voltage ꢀonitoring and reset functionality. In
addition, the MAX6412–MAX6420 reset tiꢀeout period
is adjustable using an external capacitor.
For the MAX6413, MAX6416, and MAX6419, RESET
changes froꢀ low to high whenever V
or RESET IN
CC
drops below the reset threshold voltages. Once RESET
IN and V exceed their respective reset threshold volt-
The MAX6412/MAX6413/MAX6414 have factory-
triꢀꢀed reset threshold voltages in approxiꢀately
100ꢀV increꢀents froꢀ 1.575V to 5.0V with a ꢀanual
reset input. The MAX6415/MAX6416/MAX6417 contain
a reset threshold that can be adjusted to any voltage
above 1.26V using external resistors. The MAX6418/
MAX6419/MAX6420 offer both a factory-triꢀꢀed reset
threshold and an adjustable reset threshold input for
dual-voltage ꢀonitoring.
CC
age(s), RESET reꢀains high for the reset tiꢀeout period,
then goes low.
On power-up, once V
reaches 1V, RESET is guaran-
CC
teed to be a logic high. For applications requiring valid
reset logic when V
is less than 1V, see the section
CC
Ensuring a Valid RESET/RESET Output Down to V = 0.
CC
The active-low RESET output of the reꢀaining supervi-
sors is the inverse of the MAX6413, MAX6416, and
MAX6419 active-high RESET output and is guaranteed
A reset signal is asserted when V
and/or RESET IN
CC
falls below the preset values or when MR is asserted.
valid for V
≥ 1V.
CC
The reset reꢀains asserted for an externally pro-
graꢀꢀed interval after V
and/or RESET IN has risen
CC
Reset Threshold
above the reset threshold or MR is deasserted.
The MAX6415–MAX6420 ꢀonitor the voltage on RESET
IN with an external resistor voltage-divider (Figure 1).
Reset Output
The reset output is typically connected to the reset
input of a µP. A µP’s reset input starts or restarts the µP
_______________________________________________________________________________________
5
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Use the following forꢀula to calculate the externally
V
CC
ꢀonitored voltage (V
):
MON_TH
V
= V
✕ (R1 + R2)/R2
MON_TH
RST
where V
is the desired reset threshold voltage
MON_TH
and V
is the reset input threshold (1.26V). Resistors
RST
R1 and R2 can have very high values to ꢀiniꢀize cur-
rent consuꢀption due to low leakage currents. Set R2
to soꢀe conveniently high value (1MΩ, for exaꢀple)
and calculate R1 based on the desired ꢀonitored volt-
age, using the following forꢀula:
R1
R2
RESET IN
V
CC
MAX6415–
MAX6420
R1 = R2 x (V
/V
- 1) (Ω)
MON_TH RST
GND
SRT
Manual Reset Input
(MAX6412/MAX6413/MAX6414)
Many µP based products require ꢀanual reset capabil-
ity, allowing the operator, a technician, or external logic
circuitry to initiate a reset. A logic low on MR asserts
reset. Reset reꢀains asserted while MR is low and for
the reset tiꢀeout period after MR returns high.
The MR has an internal 20kΩ pullup resistor so it can
be left open if not used. Connect a norꢀally open
ꢀoꢀentary switch froꢀ MR to ground to create a ꢀan-
ual reset function (external debounce circuitry is not
required for long reset tiꢀeout periods).
Figure 2. Adding an External Manual Reset Function to the
MAX6415–MAX6420
Monitoring Voltages Other than V
CC
(MAX6415/MAX6416/MAX6417)
The MAX6415/MAX6416/MAX6417 contain an adjustable
reset threshold input. These devices can be used to
A ꢀanual reset option can easily be iꢀpleꢀented with the
MAX6415–MAX6420 by connecting a norꢀally open
ꢀoꢀentary switch in parallel with R2 (Figure 2). When the
switch is closed, the voltage on RESET IN goes to zero,
initiating a reset. Siꢀilar to the MAX6412/MAX6413/
MAX6414 ꢀanual reset, reset reꢀains asserted while the
switch is closed and for the reset tiꢀeout period after the
switch is opened.
ꢀonitor voltages other than V . Calculate V
as
CC
MON_TH
shown in the Reset Threshold section. (See Figure 3.)
V
MON_TH
V
V
MON_TH
CC
R1
R2
R1
R2
RESET IN
V
CC
RESET IN
V
CC
MAX6415
MAX6416
MAX6417
MAX6415
MAX6416
MAX6417
GND
SRT
GND
SRT
V
= 1.26 x (R1 + R2) / R2
MON_TH
Figure 1. Calculating the Monitored Threshold Voltage (V
)
Figure 3. Monitoring External Voltages
MON_TH
6
_______________________________________________________________________________________
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
V
MON_TH
V
CC
MAX6420
ONLY
V
CC
LASER-TRIMMED
RESISTORS
R
L
(RESET)
RESET
RESET
CIRCUITRY
1.26V
µP
R1
RESET IN
R2
GND
SRT
MAX6418
MAX6419
MAX6420
C
SRT
Figure 4. MAX6418/MAX6419/MAX6420 Monitoring Two Voltages
The reset delay tiꢀe is set by a current/capacitor-con-
trolled raꢀp coꢀpared to an internal 0.65V reference.
An internal 240nA raꢀp current source charges the
external capacitor. The charge to the capacitor is
cleared when a reset condition is detected. Once the
reset condition is reꢀoved, the voltage on the capacitor
Dual-Voltage Monitoring
(MAX6418/MAX6419/MAX6420)
The MAX6418/MAX6419/MAX6420 contain both facto-
ry-triꢀꢀed threshold voltages and an adjustable reset
threshold input, allowing the ꢀonitoring of two voltages,
V
and V
(see Figure 4). Reset is asserted
MON_TH
when either of the voltages falls below its respective
threshold voltage.
CC
raꢀps according to the forꢀula: dV/dt = I/C. The C
SRT
capacitor ꢀust raꢀp to 0.65V to deassert the reset.
C
ꢀust be a low-leakage (<10nA) type capacitor,
SRT
Application Information
ceraꢀic is recoꢀꢀended.
Selecting a Reset Capacitor
The reset tiꢀeout period is adjustable to accoꢀꢀodate
a variety of µP applications. Adjust the reset tiꢀeout
Operating as a Voltage Detector
The MAX6412–MAX6420 can be operated in a voltage
detector ꢀode by floating the SRT pin. The reset delay
period (t ) by connecting a capacitor (C
) between
RP
SRT
tiꢀes for V
rising above or falling below the threshold
CC
SRT and ground. Calculate the reset tiꢀeout capacitor
as follows:
are not significantly different. The reset output is
deasserted sꢀoothly without false pulses.
C
SRT
= (t - 275µs) / (2.73 ✕ 106)
RP
where t is in seconds and C
is in Farads
RP
SRT
_______________________________________________________________________________________
7
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
iꢀpedance CMOS-logic inputs connected to RESET
3.3V
5.0V
can drift to undeterꢀined voltages. This presents no
probleꢀs in ꢀost applications, since ꢀost µPs and
other circuitry do not operate with V
below 1V.
V
CC
CC
10kΩ
In those applications where RESET ꢀust be valid down
to 0, adding a pulldown resistor between RESET and
ground sinks any stray leakage currents, holding
RESET low (Figure 6). The value of the pulldown resis-
tor is not critical; 100kΩ is large enough not to load
RESET and sꢀall enough to pull RESET to ground. For
applications using the MAX6413, MAX6416, and
MAX6419, a 100kΩ pullup resistor between RESET and
RESET
5V SYSTEM
MAX6414
MAX6417
MAX6420
V
will hold RESET high when V
falls below 1V
CC
CC
(Figure 7). Open-drain RESET versions are not recoꢀ-
GND
ꢀended for applications requiring valid logic for V
down to 0.
CC
Figure 5. MAX6414/MAX6417/MAX6420 Open-Drain RESET
Output Allows use with Multiple Supplies
V
CC
Interfacing to Other Voltages for Logic
Compatibility
MAX6412
MAX6415
MAX6418
V
CC
The open-drain outputs of the MAX6414/MAX6417/
MAX6420 can be used to interface to µPs with other
logic levels. As shown in Figure 5, the open-drain out-
put can be connected to voltages froꢀ 0 to 5.5V. This
allows for easy logic coꢀpatibility to various ꢀicro-
processors.
RESET
100kΩ
Negative-Going V
CC
Transients
GND
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these supervisors
are relatively iꢀꢀune to short-duration negative-going
transients (glitches). The Maxiꢀuꢀ Transient Duration vs.
Reset Threshold Overdrive graph in the Typical
Operating Characteristics shows this relationship.
Figure 6. Ensuring RESET Valid to V = 0
CC
The area below the curve of the graph is the region in
which these devices typically do not generate a reset
pulse. This graph was generated using a negative-
V
CC
100kΩ
going pulse applied to V , starting above the actual
CC
MAX6413
MAX6416
MAX6419
V
CC
reset threshold (V ) and ending below it by the ꢀagni-
TH
tude indicated (reset-threshold overdrive). As the ꢀag-
nitude of the transient decreases (farther below the
reset threshold), the ꢀaxiꢀuꢀ allowable pulse width
RESET
decreases. Typically, a V
transient that goes 100ꢀV
CC
below the reset threshold and lasts 50µs or less will not
cause a reset pulse to be issued.
GND
Ensuring a Valid RESET or RESET
Down to V
CC
= 0
When V
falls below 1V, RESET/RESET current sink-
CC
Figure 7. Ensuring RESET Valid to V = 0
ing (sourcing) capabilities decline drastically. In the
case of the MAX6412, MAX6415, and MAX6418, high-
CC
8
_______________________________________________________________________________________
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Layout Consideration
Table 1. Reset Voltages Suffix Table
SRT is a precise current source. When developing the
SUFFIX
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
MIN
TYP
MAX
1.614
1.707
1.845
1.948
2.050
2.153
2.243
2.371
2.460
2.563
2.691
2.768
2.870
2.998
3.075
3.152
3.280
3.383
3.485
3.558
3.690
3.793
3.895
3.998
4.100
4.203
4.305
4.408
4.484
4.613
4.741
4.818
4.920
5.023
5.125
layout for the application, be careful to ꢀiniꢀize board
capacitance and leakage currents around this pin.
Traces connected to SRT should be kept as short as
possible. Traces carrying high-speed digital signals
and traces with large voltage potentials should be rout-
ed as far froꢀ SRT as possible. Leakage current and
stray capacitance (e.g., a scope probe) at this pin
could cause errors in the reset tiꢀeout period. When
evaluating these parts, use clean prototype boards to
ensure accurate reset periods.
1.536
1.623
1.755
1.853
1.950
2.048
2.133
2.313
2.340
2.438
2.559
2.633
2.730
2.852
2.925
2.998
3.120
3.218
3.315
3.413
3.510
3.608
3.705
3.803
3.900
3.998
4.095
4.193
4.266
4.388
4.509
4.583
4.680
4.778
4.875
1.575
1.665
1.800
1.900
2.000
2.100
2.188
2.313
2.400
2.500
2.625
2.700
2.800
2.925
3.000
3.075
3.200
3.300
3.400
3.500
3.600
3.700
3.800
3.900
4.000
4.100
4.200
4.300
4.375
4.500
4.625
4.700
4.800
4.900
5.000
RESET IN is a high-iꢀpedance input, which is typically
driven by a high-iꢀpedance resistor-divider network
(e.g., 1MΩ to 10MΩ). Miniꢀize coupling to transient sig-
nals by keeping the connections to this input short. Any
DC leakage current at RESET IN (e.g., a scope probe)
causes errors in the prograꢀꢀed reset threshold.
Chip Information
TRANSISTOR COUNT: 325
PROCESS: BiCMOS
_______________________________________________________________________________________
9
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Standard Versions Table
PART*
TOP MARK
ADVY
ADWA
ADWC
ADWD
ADWG
ADWI
MAX6412UK16-T
MAX6412UK22-T
MAX6412UK26-T
MAX6412UK29-T
MAX6412UK46-T
MAX6413UK16-T
MAX6413UK22-T
MAX6413UK26-T
MAX6413UK29-T
MAX6413UK46-T
MAX6414UK16-T
MAX6414UK22-T
MAX6414UK26-T
MAX6414UK29-T
MAX6414UK46-T
MAX6415UK-T
ADWK
ADWM
ADWN
ADWQ
ADWS
ADWU
ADWW
ADWX
ADXA
ADZO
ADZP
ADZQ
ADYQ
ADYI
MAX6416UK-T
MAX6417UK-T
MAX6418UK16-T
MAX6418UK22-T
MAX6418UK26-T
MAX6418UK29-T
MAX6418UK46-T
MAX6419UK16-T
MAX6419UK22-T
MAX6419UK26-T
MAX6419UK29-T
MAX6419UK46-T
MAX6420UK16-T
MAX6420UK22-T
MAX6420UK26-T
MAX6420UK29-T
MAX6420UK46-T
ADYK
ADYL
ADYO
ADYQ
ADYS
ADYU
ADYV
ADYY
ADZA
ADZC
ADZE
ADZF
ADZI
*Sample Stock is generally held on all standard versions.
Contact factory for availability of nonstandard versions.
10 ______________________________________________________________________________________
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Selector Guide
FIXED
MANUAL
RESET
PUSH-PULL
RESET
PUSH-PULL
RESET
OPEN-DRAIN
PART
RESET IN
V
RESET
TH
MAX6412
MAX6413
MAX6414
MAX6415
MAX6416
MAX6417
MAX6418
MAX6419
MAX6420
✔
✔
✔
—
—
—
✔
✔
✔
✔
✔
—
—
—
✔
✔
✔
✔
✔
✔
✔
—
—
✔
—
✔
—
—
✔
✔
—
—
✔
—
—
—
—
—
—
—
—
✔
—
—
✔
—
—
✔
—
—
✔
—
—
—
Typical Operating Circuit
V
CC
V
CC
RESET/RESET
RESET/RESET
µP
MAX6412
MAX6413
MAX6414
MR
GND
SRT
______________________________________________________________________________________ 11
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxiꢀ Integrated Products
Printed USA
is a registered tradeꢀark of Maxiꢀ Integrated Products.
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