MAX6381XS18D3-T [MAXIM]
SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits; SC70封装，单/双路低电压，低功耗レP复位电路
| 型号： | MAX6381XS18D3-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits |
| 文件： | 总11页 (文件大小：195K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1839; Rev 1; 04/01
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
General Description
Features
The MAX6381–MAX6390 microprocessor (µP) supervisory
circuits monitor power supply voltages from +1.8V to
+5.0V while consuming only 3µA of supply current at
o Factory-Set Reset Threshold Voltages Ranging
from +1.58V to +4.63V in Approximately 100mV
Increments
+1.8V. Whenever V
falls below the factory-set reset
CC
o ±±.5ꢀ Reset Threshold Accꢁracy ꢂOer
thresholds, the reset output asserts and remains assert-
ed for a minimum reset timeout period after V rises
Temperatꢁre (-40°C to +1±5°C)
CC
above the reset threshold. Reset thresholds are available
from +1.58V to +4.63V, in approximately 100mV incre-
ments. Seven minimum reset timeout delays ranging
from 1ms to 1200ms are available.
o SeOen Reset Timeoꢁt Periods AOailable: 1ms,
±0ms, 140ms, ±80ms, 560ms, 11±0ms,
1±00ms (min)
o 3 Reset ꢂꢁtpꢁt ꢂptions
ActiOe-Low Pꢁsh-Pꢁll
ActiOe-High Pꢁsh-Pꢁll
ActiOe-Low ꢂpen-Drain
The MAX6381/MAX6384/MAX6387 have a push-pull
active-low reset output. The MAX6382/MAX6385/
MAX6388 have a push-pull active-high reset output,
and the MAX6383/MAX6386/MAX6389/MAX6390
have an open-drain active-low reset output. The
o Reset ꢂꢁtpꢁt State Gꢁaranteed Valid
MAX6384/MAX6385/MAX6386 also feature
a
Down to V
= 1V
CC
debounced manual reset input (with internal pullup
resistor). The MAX6387/MAX6388/MAX6389 have an
auxiliary input for monitoring a second voltage. The
o Manꢁal Reset Inpꢁt (MAX6384/MAX6385/MAX6386)
o Aꢁxiliary RESET IN
MAX6390 offers a manual reset input with a longer V
CC
(MAX6387/MAX6388/MAX6389)
reset timeout period (1120ms or 1200ms) and a shorter
manual reset timeout (140ms or 150ms).
o V
Reset Timeoꢁt (11±0ms or 1±00ms)/Manꢁal
CC
The MAX6381/MAX6382/MAX6383 are available in 3-pin
SC70 packages and the MAX6384–MAX6390 are avail-
able in 4-pin SC70 packages.
Reset Timeoꢁt (140ms or 150ms) (MAX6390)
o NegatiOe-Going V Transient Immꢁnity
CC
o Low Power Consꢁmption of 6µA at +3.6V
________________________Applications
and 3µA at +1.8V
Computers
o Pin Compatible with
Controllers
MAX809/MAX810/MAX803/MAX63±6/MAX63±7/
MAX63±8/MAX6346/MAX6347/MAX6348,
and MAX6711/MAX671±/MAX6713
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Dual Voltage Systems
o Tiny 3-Pin SC70 and 4-Pin SC70 Packages
Ordering Information
PART
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
MAX6381XR_ _D_-T
MAX6382XR_ _D_-T
MAX6383XR_ _D_-T
3 SC70-3
Pin Configurations
3 SC70-3
3 SC70-3
TOP VIEW
Note: Insert reset threshold suffix (see Reset Threshold table)
after "XR" or "XS". Insert reset timeout delay (see Reset Timeout
Delay table) after "D" to complete the part number. Sample
stock is generally held on standard versions only (see
Standard Versions table). Standard versions have an order
increment requirement of 2500 pieces. Nonstandard versions
have an order increment requirement of 10,000 pieces.
Contact factory for availability of nonstandard versions.
GND
1
2
MAX6381
MAX6382
MAX6383
3
V
CC
RESET
(RESET)
SC70
*MAX6390 is available with D4 or D7 timing only.
( ) IS FOR MAX6382
Ordering Information continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
ABSOLUTE MAXIMUM RATINGS
CC
V
to GND..........................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
RESET Open-Drain Output....................................-0.3V to +6.0V
3-Pin SC70 (derate 2.9mW/°C above +70°C)........235mW
4-Pin SC70 (derate 3.1mW/°C above +70°C)........245mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
RESET, RESET (Push-Pull Output) .............-0.3V to (V
MR, RESET IN.............................................-0.3V to (V
+ 0.3V)
+ 0.3V)
CC
CC
Input Current (V ).............................................................20mA
CC
Output Current (All Pins).....................................................20mA
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
= full range, T = -40°C to +125°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
13
11
7
UNITS
Operating Voltage Range
V
1.0
V
CC
V
V
V
V
= 5.5V, no load
7
6
4
3
CC
CC
CC
CC
= 3.6V, no load
= 2.5V, no load
= 1.8V, no load
V
Supply Current
I
µA
V
CC
CC
6
V
-
V
+
TH
TH
T
T
= +25°C
V
V
A
A
TH
TH
1.5%
1.5%
V
Reset Threshold
CC
V
TH
(See Reset Thresholds table)
Reset Threshold Tempco
V
-
V
+
TH
TH
= -40°C to +125°C
2.5%
2.5%
∆V /°C
60
35
ppm/°C
TH
V
falling at 10mV/µs from V + 100mV
TH
CC
V
to Reset Delay
µs
CC
to V - 100mV
TH
D1
D2
D3
D5
D6
D4
D7
1
2
20
40
140
280
560
1120
1200
140
150
1120
1200
280
Reset Timeout Period
MAX6381–MAX6389
(See Reset Timeout table)
t
ms
560
RP
1120
2240
2400
280
D4
D7
D4
D7
MR timeout period
300
Reset Timeout Period
MAX6390
t
RP
ms
2240
2400
V
V
V
timeout period
< 4V
CC
TH
TH
✕
0.3
CC
V
V
IL
V
✕
0.7
MR Input Voltage
V
IH
V
CC
V
0.8
IL
> 4V
V
2.4
IH
2
_______________________________________________________________________________________
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
ELECTRICAL CHARACTERISTICS (continued)
(V
= full range, T = -40°C to +125°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
µs
MR Minimum Input Pulse Width
MR Glitch Rejection
1
100
200
63
ns
MR to Reset Delay
ns
MAX6381–MAX6389
MAX6390
32
100
kΩ
Ω
MR Internal Pullup Resistance
800
1350
1.27
2300
1.295
1.308
1.321
T
T
T
= +25°C
1.245
1.232
1.219
A
A
A
Reset IN Input Threshold
V
V
= 0°C to +85°C
= -40°C to +125°C
THRST
V
V
falling at 4mV/µs from
RESETIN
RESET IN to RESET Delay
4.5
1
µs
+ 40mV to V
- 40mV
THRST
THRST
RESET IN Input Leakage Current
I
-50
+50
0.4
0.3
0.3
nA
RESETIN
V
V
V
≥ 4.5V, I
= 3.2mA, reset asserted
= 1.2mA, reset asserted
= 80µA, reset asserted
CC
CC
CC
SINK
SINK
SINK
Open-Drain RESET Output
Voltage
V
≥ 2.5V, I
≥ 1.0V, I
V
OL
Open-Drain RESET Output
Leakage Current
I
V
> V , RESET not asserted
1.0
µA
LKG
CC
TH
V
V
V
≥ 4.5V, I
≥ 2.5V, I
≥ 1.0V, I
= 3.2mA, reset asserted
= 1.2mA, reset asserted
= 80µA, reset asserted
0.4
0.3
0.3
CC
CC
CC
SINK
SINK
SINK
V
OL
Push-Pull RESET Output Voltage
V
✕
V
≥ 4.5V, I
= 800µA, reset not
0.8
CC
SOURCE
asserted
V
CC
V
V
OH
✕
V
≥ 2.5V, I
= 500µA, reset not
0.8
CC
SOURCE
asserted
V
CC
✕
0.8
V
V
V
≥ 4.5V, I
≥ 2.5V, I
≥ 1.8V, I
= 800µA, reset asserted
= 500µA, reset asserted
= 150µA, reset asserted
= 1µA, reset asserted
CC
CC
CC
SOURCE
SOURCE
SOURCE
SOURCE
V
CC
✕
0.8
V
CC
OH
✕
0.8
V
CC
Push-Pull RESET Output Voltage
V
✕
0.8
V
V
≥ 1.0V, I
CC
CC
V
CC
≥ 4.5V, I
= 3.2mA, reset not
SINK
0.4
0.3
asserted
V
OL
V
≥ 2.5V, I
= 1.2mA, reset not
CC
SINK
asserted
Note 1: Specifications over temperature are guaranteed by design, not production tested.
_______________________________________________________________________________________
3
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT vs. TEMPERATURE
POWER-DOWN RESET DELAY
vs. TEMPERATURE
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
(NO LOAD)
9
43
41
39
37
35
33
31
29
27
25
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
8
7
V
= +3.0V
CC
V
= +3.6V
CC
V
= +5.5V
CC
6
5
4
3
2
1
0
V
= +1.8V
CC
V
= +2.5V
CC
V
CC
= +1.8V
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
1.2
1.0
0.8
0.6
0.4
0.2
0
1.020
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0.990
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= +2.5V
CC
V
CC
= +3.0V
V
= +1.8V
500
CC
V
= +4.5V
CC
0
3
6
9
12
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
250
750 1000 1250 1500
I
(mA)
TEMPERATURE (°C)
SINK
I
(µA)
SOURCE
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
RESET IN TO RESET DELAY
vs. TEMPERATURE
500
5.5
5.3
5.1
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
450
400
350
300
RESET ASSERTED
ABOVE THIS LINE
250
200
150
100
50
0
1
10
100
1000
-40 -25 -10
5
20 35 50 65 80 95 110 125
RESET COMPARATOR OVERDRIVE, V - V (mV)
TEMPERATURE (°C)
TH
CC
4
______________________________________________________________________________________
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Pin Description
PIN
MAX6384/
NAME
FUNCTION
MAX6381/
MAX6383
MAX6387/
MAX6389
MAX6386/
MAX6390
MAX6382
MAX6385
MAX6388
1
1
1
1
1
1
GND
Ground
Active-High Push-Pull Reset Output. RESET
changes from low to high when any
monitored voltage (V
or V
) drops
RESETIN
CC
—
2
—
2
—
2
RESET
below the reset threshold or MR is pulled low.
RESET remains high for the reset timeout
period after monitored voltages exceed the
reset thresholds or MR is released.
Active-Low Open-Drain/Push-Pull Reset
Output. RESET changes from high to low when
any monitored voltage (V or V
)
RESETIN
CC
drops below the reset threshold or MR is
pulled low. remains low for the reset
2
—
2
—
2
—
RESET
RESET
timeout period after the monitored voltages
exceed the reset thresholds or MR is released.
Open-drain requires an external pullup
resistor.
Active-Low Manual Reset Input. Drive low to
force a reset. Reset remains active as long
as MR is low and for the reset timeout period
after MR is released. Leave unconnected or
—
—
3
3
—
—
MR
connect to V
if unused. MR has an internal
CC
63kΩ (1.35kΩ for MAX6390) pullup resistor to
V
.
CC
Auxiliary Reset Input. High-impedance input
to the auxiliary reset comparator. Connect
RESET IN to the center point of an external
resistor voltage-divider network to set the
reset threshold voltage. Reset asserts when
RESET
IN
—
—
—
—
3
4
3
4
either V
or RESET IN falls below its
CC
threshold voltage.
Supply Voltage for the device and input for
3
3
4
4
V
CC
fixed V
reset threshold monitor.
CC
_______________________________________________________________________________________
5
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Detailed Description
Reset Thresholds (-40°C to +125°C)
SUFFIX
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
V
(min)
V
(nom)
V
(max)
TH
RESET Output
A µP reset input starts the µP in a known state. These
µP supervisory circuits assert reset to prevent code
execution errors during power-up, power-down, or
brownout conditions.
TH
TH
4.51
4.63
4.74
4.39
4.27
4.19
4.10
4.00
3.90
3.80
3.71
3.61
3.51
3.41
3.32
3.22
3.12
3.00
2.93
2.85
2.73
2.63
2.56
2.44
2.34
2.26
2.13
2.05
1.95
1.85
1.76
1.62
1.54
4.50
4.38
4.30
4.20
4.10
4.00
3.90
3.80
3.70
3.60
3.50
3.40
3.30
3.20
3.08
3.00
2.93
2.80
2.70
2.63
2.50
2.40
2.31
2.19
2.10
2.00
1.90
1.80
1.67
1.58
4.61
4.48
4.41
4.31
4.20
4.10
4.00
3.90
3.79
3.69
3.59
3.49
3.38
3.28
3.15
3.08
3.00
2.87
2.77
2.69
2.56
2.46
2.37
2.24
2.15
2.05
1.95
1.85
1.71
1.61
Reset asserts when V
is below the reset threshold;
CC
once V
exceeds the reset threshold, an internal timer
CC
keeps the reset output asserted for the reset timeout
period. After this interval, reset output deasserts. Reset
output is guaranteed to be in the correct logic state for
V
CC
≥ 1V.
Manual Reset Input (MAX6384/
MAX6385/MAX6386/MAX6390)
Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MR is low,
and for the reset active timeout period (t ) after MR
RP
returns high. This input has an internal 63kΩ pullup
resistor (1.35kΩ for MAX6390), so it can be left uncon-
nected if it is not used. MR can be driven with TTL or
CMOS logic levels, or with open-drain/collector outputs.
Connect a normally open momentary switch from MR to
GND to create a manual-reset function; external
debounce circuitry is not required. If MR is driven from
long cables or if the device is used in a noisy environ-
ment, connecting a 0.1µF capacitor from MR to GND
provides additional noise immunity.
RESET IN Comparator
(MAX6387/MAX6388/MAX6389)
RESET IN is compared to an internal +1.27V reference.
If the voltage at RESET IN is less than 1.27V, reset
asserts. Use the RESET IN comparator as a user-
adjustable reset detector or as a secondary power-sup-
ply monitor by implementing a resistor-divider at RESET
IN (shown in Figure 1). Reset asserts when either V
CC
or RESET IN falls below its respective threshold volt-
age. Use the following equation to set the threshold:
V
= V
(R1/R2 + 1)
INTH
THRST
___________Applications Information
where V
= +1.27V. To simplify the resistor selec-
THRST
Negative-Going V
CC
Transients
tion, choose a value of R2 and calculate R1:
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the
MAX6381–MAX6390 are relatively immune to short dura-
R1 = R2 [(V /V ) - 1]
INTH THRST
Since the input current at RESET IN is 50nA (max),
large values can be used for R2 with no significant loss
in accuracy.
tion negative-going V transients (glitches).
CC
The Typical Operating Characteristics section shows the
Maximum Transient Durations vs. Reset Comparator
Overdrive, for which the MAX6381–MAX6390 do not
generate a reset pulse. This graph was generated using
6
_______________________________________________________________________________________
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
V
V
CC
CC
V
IN
MAX6387
MAX6388
MAX6389
MAX6381
MAX6384
MAX6387
R1
R2
RESET
(RESET)
RESET
RESET IN
R1
100k
GND
GND
( ) IS FOR MAX6388
Figure 1. RESET IN Configuration
Figure 2. RESET Valid to V = Ground Circuit
CC
Reset Timeout Delay
not work with the open-drain outputs of the
MAX6383/MAX6386/MAX6389/MAX6390. The resistor
value used is not critical, but it must be small enough
SUFFIX
MIN
D1
1ms
D2
20ms
not to load the reset output when V
is above the reset
CC
threshold. For most applications, 100kΩ is adequate.
D3
140ms
D5
280ms
D6
D4
560ms
1120ms
1200ms
1120/140ms *
1200/150ms *
D7
Standard Versions
MAX6390XSD4
MAX6390XSD7
RESET
THRESHOLD
PART
RESET TIMEOUT
* The MAX6390 has a 1120ms or 1200ms RESET timeout and a
140ms or 150ms manual reset timeout
46
44
31
29
26
23
22
17
16
46
44
31
29
26
23
22
17
16
a negative-going pulse applied to V , starting above the
CC
actual reset threshold and ending below it by the magni-
tude indicated (reset comparator overdrive). The graph
indicates the typical maximum pulse width a negative-
MAX638_
D3
going V
transient may have without causing a reset
CC
pulse to be issued. As the magnitude of the transient
increases (goes farther below the reset threshold), the
maximum allowable pulse width decreases. A 0.1µF
capacitor mounted as close as possible to V
additional transient immunity.
provides
CC
Ensuring a Valid RESET
Output Down to V = 0
CC
The MAX6381–MAX6390 are guaranteed to operate
properly down to V = 1V. In applications that require
CC
MAX6390
D4
valid reset levels down to V
= 0, a pulldown resistor to
CC
active-low outputs (push/pull only, Figure 2) and a
pullup resistor to active-high outputs (push/pull only) will
ensure that the reset line is valid while the reset output
can no longer sink or source current. This scheme does
_______________________________________________________________________________________
7
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Selector Guide
PUSH-PULL
ACTIVE-LOW
PUSH-PULL
ACTIVE-HIGH
OPEN-DRAIN
ACTIVE-LOW
MANUAL RESET
PART NUMBER
RESET IN
INPUT MR
MAX6381
MAX6382
MAX6383
MAX6384
MAX6385
MAX6386
MAX6390*
MAX6387
MAX6388
MAX6389
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
*The MAX6390 offers a V
reset timeout of 1120ms or 1200ms (min) and a manual reset timeout of 140ms or 150ms (min).
CC
Typical Operating Circuit
Pin Configurations (continued)
I/O SUPPLY
TOP VIEW
V
CORE
R1
R1
V
CC
1
2
4
V
GND
CC
RESET IN **
CORE
VOLTAGE VOLTAGE
I/O
MAX6384
MAX6385
MAX6386
MAX6390
MAX6381–MAX6390
µP
RESET
(RESET)
RESET
INPUT
GND
MR *
MR
RESET
(RESET)
3
GND
PUSHBUTTON SWITCH
SC70
( ) IS FOR MAX6385
GND
* MR is for MAX6384/MAX6385/MAX6386/MAX6390
** RESET IN is for MAX6387/MAX6388/MAX6389
( ) are for MAX6382/MAX6385/MAX6388
1
4
V
CC
MAX6387
MAX6388
MAX6389
Chip Information
TRANSISTOR COUNT: 647
PROCESS: BiCMOS
RESET
(RESET)
2
3
RESET IN
SC70
( ) IS FOR MAX6388
8
_______________________________________________________________________________________
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Ordering Information
(continued)
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
PIN-PACKAGE
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
MAX6384XS_ _D_-T
MAX6385XS_ _D_-T
MAX6386XS_ _D_-T
MAX6387XS_ _D_-T
MAX6388XS_ _D_-T
MAX6389XS_ _D_-T
MAX6390XS_ _D_-T* -40°C to +125°C
Note: Insert reset threshold suffix (see Reset Threshold table)
after "XR" or "XS". Insert reset timeout delay (see Reset Timeout
Delay table) after "D" to complete the part number. Sample
stock is generally held on standard versions only (see
Standard Versions table). Standard versions have an order
increment requirement of 2500 pieces. Nonstandard versions
have an order increment requirement of 10,000 pieces.
Contact factory for availability of nonstandard versions.
*MAX6390 is available with D4 or D7 timing only.
_______________________________________________________________________________________
9
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Package Information
10 ______________________________________________________________________________________
SC70, Single/Dual Low-Voltage,
Low-Power µP Reset Circuits
Package Information (continued)
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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