MAX6315US31D1+T [ROCHESTER]
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4, LEAD FREE, TO-253, SOT-143, 4 PIN;
| 型号： | MAX6315US31D1+T |
| 厂家： | 
Rochester Electronics |
| 描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4, LEAD FREE, TO-253, SOT-143, 4 PIN 输入元件 光电二极管 |
| 文件： | 总8页 (文件大小：1186K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2000; Rev 3; 12/05
Open-Drain SOT µP Reset Circuit
________________General Description
____________________________Features
The MAX6315 low-power CMOS microprocessor (µP)
supervisory circuit is designed to monitor power sup-
plies in µP and digital systems. It provides excellent cir-
cuit reliability and low cost by eliminating external
components and adjustments. The MAX6315 also pro-
vides a debounced manual reset input.
♦ Small SOT143 Package
♦ Open-Drain RESET Output Can Exceed V
♦ Precision, Factory-Set V
100mV Increments from 2.5V to 5V
♦ Four Reset Timeout Periods Available:
1ms, 20ms, 140ms, or 1120ms (minimum)
CC
Reset Thresholds:
CC
This device performs a single function: it asserts a reset
signal whenever the V
supply voltage falls below a
CC
♦ Immune to Short V
Transients
CC
preset threshold or whenever manual reset is asserted.
Reset remains asserted for an internally programmed
♦ 5µA Supply Current
♦ Pin-Compatible with MAX811
♦ Guaranteed Over Temperature
interval (reset timeout period) after V
has risen above
CC
the reset threshold or manual reset is deasserted. The
MAX6315’s open-drain RESET output can be pulled up
______________Ordering Information
to a voltage higher than V
.
CC
The MAX6315 comes with factory-trimmed reset thresh-
old voltages in 100mV increments from 2.5V to 5V.
Preset timeout periods of 1ms, 20ms, 140ms, and
1120ms (min) are also available. The device comes in a
SOT143 package.
NOMINAL MIN t
TOP
MARK
RP
†
PART
††
V
(V)
(ms)
TH
MAX6315US50D1-T
5.00
1
FX_ _
†
The MAX6315 is available in a SOT143 package, -40°C to
+125°C temperature range.
For microcontrollers (µCs) and µPs with bidirectional
reset pins, see the MAX6314 data sheet.
††
The first two letters in the package top mark identify the part,
while the remaining two letters are the lot tracking code.
Devices are available in both leaded and lead-free packaging.
________________________Applications
Specify lead-free by replacing “-T” with “+T” when ordering.
Computers
Note: All devices available in tape-and-reel only. Contact fac-
tory for availability.
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Ordering Information continued at end of data sheet.
Pin Configuration
__________Typical Operating Circuit
V
CC
TOP VIEW
V
CC
LASER-
TRIMMED
1
4
GND
V
CC
RESISTORS
RESET
MAX6315
µP
RESET
RESET
CIRCUITRY
RESET
2
3
MR
MR
SOT143
MAX6315
GND
________________________________________________________________ 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.
Open-Drain SOT µP Reset Circuit
ABSOLUTE MAXIMUM RATINGS
CC
V
........................................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
RESET....................................................................-0.3V to +6.0V
All Other Pins..............................................-0.3V to (V + 0.3V)
SOT143 (derate 4mW/°C above +70°C)........................320mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
Input Current (V ).............................................................20mA
CC
Output Current (RESET)......................................................20mA
Rate of Rise (V )...........................................................100V/µs
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
= +2.5V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.)
A A
CC
PARAMETER
Operating Voltage Range
SYMBOL
CONDITIONS
= -40°C to +85°C
A
MIN
TYP
MAX
5.5
12
15
10
UNITS
V
T
1.0
V
CC
V
CC
= 5.5V, no load (-40°C to +85°C)
= 5.5V, no load (-40°C to +125°C)
= 3.6V, no load (-40°C to +85°C)
= 3.6V, no load (-40°C to +125°C)
5
V
CC
V
Supply Current
I
µA
CC
CC
V
V
4
CC
CC
12
T
T
T
= +25°C
= -40°C to +85°C
= -40°C to +125°C
V
- 1.8%
- 2.5%
- 3.5%
V
V
TH
V
TH
V
TH
+ 1.8%
+ 2.5%
+ 3.5%
A
A
A
TH
TH
Reset Threshold (Note 1)
Reset Threshold Tempco
V
V
TH
V
TH
V
TH
∆V /°C
60
35
ppm/°C
µs
TH
V
to Reset Delay
V
= falling at 1mV/µs
CC
CC
MAX6315US_ _D1-T (-40°C to +85°C)
MAX6315US_ _D1-T (-40°C to +125°C)
MAX6315US_ _D2-T (-40°C to +85°C)
MAX6315US_ _D2-T (-40°C to +125°C)
MAX6315US_ _D3-T (-40°C to +85°C)
MAX6315US_ _D3-T (-40°C to +125°C)
MAX6315US_ _D4-T (-40°C to +85°C)
MAX6315US_ _D4-T (-40°C to +125°C)
1
1.4
2
2.4
40
48
280
336
0.8
20
16
140
112
28
Reset Timeout Period
t
ms
RP
200
1120
896
1570
2240
2688
MANUAL RESET INPUT
V
0.8
IL
V
V
> 4.0V
< 4.0V
TH
V
2.4
IH
V
MR Input Threshold
V
0.3 x V
IL
CC
TH
V
0.7 x V
IH
CC
1
µs
ns
ns
kΩ
MR Minimum Input Pulse
MR Glitch Rejection
MR to Reset Delay
100
500
63
32
100
0.4
0.3
0.3
0.3
1
MR Pull-Up Resistance
V
CC
V
CC
V
CC
V
CC
V
CC
> 4.25V, I
= 3.2mA
SINK
> 2.5V, I
> 1.2V, I
> 1.0V, I
= 1.2mA
= 0.5mA
= 80µA
SINK
SINK
SINK
V
V
RESET Output Voltage
OL
µA
RESET Output Leakage Current
Note 1: The MAX6315 monitors V
> V , RESET deasserted
TH
through an internal factory-trimmed voltage-divider that programs the nominal reset threshold.
CC
Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see the Ordering Information).
2
_______________________________________________________________________________________
Open-Drain SOT µP Reset Circuit
__________________________________________Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
POWER-DOWN RESET DELAY
vs. TEMPERATURE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
6
50
40
6
5
4
3
2
1
0
V
FALLING AT 1mV/µs
CC
5
V
= 5V
V
CC
4
3
2
1
0
T
= +85°C
V
V
= 4.63V
= 3.00V
A
TH
TH
30
20
10
0
= 3V
CC
T
= +25°C
A
T
= -40°C
A
V
= 1V
CC
-50 -30 -10
10
30
50
70
90
-50 -30 -10
10
30
50
70
90
0
1
2
3
5
4
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE (V RISING)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE (V FALLING)
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
CC
CC
1.04
1.03
1.006
1.004
1.002
1.000
0.998
0.996
0.994
100
80
60
40
20
0
T
= +25°C
A
RESET OCCURS
ABOVE CURVE
1.02
1.01
V
= 4.63V
TH
1.00
0.99
0.98
0.97
V = 3.00V
T
0.96
-50 -30 -10
10
30
50
70
90
-50 -30 -10
10
30
50
70
90
10
100
RESET COMP. OVERDRIVE, V - V (mV)
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
TH
CC
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1
GND
Ground
Active-Low Open-Drain Output. Connect to an external pullup resistor. Can be pulled up to a voltage
higher than V , but less than 6V.
CC
2
RESET
MR
Manual Reset Input. A logic-low on MR asserts reset. Reset remains asserted as long as MR is low, and
3
4
for the reset timeout period (t ) after the reset conditions are terminated. Connect to V
if not used.
RP
CC
V
CC
Supply Voltage and Reset Threshold Monitor Input
_______________________________________________________________________________________
3
Open-Drain SOT µP Reset Circuit
_______________Detailed Description
Reset Output
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6315 asserts reset to prevent
code-execution errors during power-up, power-
down, or brownout conditions. RESET is guaranteed to
+3.3V
+5.0V
V
CC
10kΩ
MR
RESET
be a logic-low for V
> 1V (see the Electrical
CC
Characteristics table). Once V
exceeds the reset
CC
5V SYSTEM
threshold, the internal timer keeps reset asserted for the
reset timeout period (t ); after this interval RESET
RP
goes high. If a brownout condition occurs (monitored
voltage dips below its programmed reset threshold),
MAX6315
GND
RESET goes low. Any time V
dips below the reset
CC
threshold, the internal timer resets to zero and RESET
goes low. The internal timer starts when V
returns
CC
above the reset threshold, and RESET remains low for
Figure 1. MAX6315 Open-Drain RESET Output Allows Use
with Multiple Supplies
the reset timeout period.
The MAX6315’s RESET output structure is a simple
open-drain n-channel MOSFET switch. Connect a pull-
up resistor to any supply in the 0V to +6V range. Select
a resistor value large enough to register a logic low
when RESET is asserted (see the Electrical
Characteristics table), and small enough to register a
logic high while supplying all input current and leakage
paths connected to the RESET line. A 10kΩ pullup is
sufficient in most applications.
MR has an internal 63kΩ pullup resistor, so it can be
left open if not used. Connect a normally open momen-
tary 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 environment, connecting a 0.1µF capacitor
from MR to ground provides additional noise immunity.
Often, the pull-up connected to the MAX6315’s RESET
__________Applications Information
output will connect to the supply voltage monitored at
Negative-Going V
Transients
CC
the IC’s V
pin. However, some systems may use the
CC
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration negative-going
transients (glitches). The Typical Operating Character-
istics show the Maximum Transient Duration vs. Reset
Threshold Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 1). This is one useful feature of an open-drain
output. Keep in mind that as the MAX6315’s V
CC
decreases below 1V, so does the IC’s ability to sink
current at RESET. Finally, with any pullup, RESET will
be pulled high as V
decays toward 0V. The voltage
CC
going pulses, starting at V
max and ending below
RST
where this occurs depends on the pull-up resistor value
and the voltage to which it connects (see the Electrical
Characteristics table).
the programmed reset threshold by the magnitude indi-
cated (reset threshold overdrive). The graph shows the
maximum pulse width that a negative-going V
tran-
CC
Manual-Reset Input
Many µP-based products require manual-reset capa-
bility, allowing the operator, a test technician, or exter-
nal 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 after MR
returns high.
sient may typically have without causing a reset pulse
to be issued. As the transient amplitude increases (i.e.,
goes farther below the reset threshold), the maximum
allowable pulse width decreases. A 0.1µF bypass
capacitor mounted close to V
transient immunity.
provides additional
CC
4
_______________________________________________________________________________________
Open-Drain SOT µP Reset Circuit
___________________________________________Ordering Information (continued)
NOMINAL MIN t
TOP
MARK
NOMINAL MIN t
TOP
MARK
RP
RP
†
†
PART
PART
††
††
V
(V)
(ms)
V
(V)
(ms)
TH
TH
MAX6315US49D1-T
MAX6315US48D1-T
MAX6315US47D1-T
MAX6315US46D1-T
MAX6315US45D1-T
MAX6315US44D1-T
MAX6315US43D1-T
MAX6315US42D1-T
MAX6315US41D1-T
MAX6315US40D1-T
MAX6315US39D1-T
MAX6315US38D1-T
MAX6315US37D1-T
MAX6315US36D1-T
MAX6315US35D1-T
MAX6315US34D1-T
MAX6315US33D1-T
MAX6315US32D1-T
MAX6315US31D1-T
MAX6315US30D1-T
MAX6315US29D1-T
MAX6315US28D1-T
MAX6315US27D1-T
MAX6315US26D1-T
MAX6315US25D1-T
4.90
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
FY_ _
FZ_ _
MAX6315US50D2-T
MAX6315US49D2-T
MAX6315US48D2-T
MAX6315US47D2-T
MAX6315US46D2-T
MAX6315US45D2-T
MAX6315US44D2-T
MAX6315US43D2-T
MAX6315US42D2-T
MAX6315US41D2-T
MAX6315US40D2-T
MAX6315US39D2-T
MAX6315US38D2-T
MAX6315US37D2-T
MAX6315US36D2-T
MAX6315US35D2-T
MAX6315US34D2-T
MAX6315US33D2-T
MAX6315US32D2-T
MAX6315US31D2-T
MAX6315US30D2-T
MAX6315US29D2-T
MAX6315US28D2-T
MAX6315US27D2-T
MAX6315US26D2-T
MAX6315US25D2-T
5.00
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
GX_ _
GY_ _
GZ_ _
HA_ _
HB_ _
HC_ _
HD_ _
HE_ _
HF_ _
HG_ _
HH_ _
HI_ _
4.80
4.70
4.63
4.50
4.39
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
4.90
4.80
4.70
4.63
4.50
4.39
4.30
4.20
4.10
4.00
3.90
3.80
3.70
3.60
3.50
3.40
3.30
4.20
3.08
3.00
2.93
2.80
2.70
2.63
2.50
GA_ _
GB_ _
GC_ _
GD_ _
GE_ _
GF_ _
GG_ _
GH_ _
GI_ _
†††
†††
GJ_ _
GK_ _
GL_ _
GM_ _
GN_ _
GO_ _
GP_ _
GQ_ _
GR_ _
GS_ _
GT_ _
GU_ _
GV_ _
GW_ _
HJ_ _
HK_ _
HL_ _
HM_ _
HN_ _
HO_ _
HP_ _
HQ_ _
HR_ _
HS_ _
HT_ _
HU_ _
HV_ _
HW_ _
†††
†††
†
††
†††
The MAX6315 is available in a SOT143 package, -40°C to +125°C temperature range.
The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.
Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.
Note: All devices available in tape-and-reel only. Contact factory for availability.
_______________________________________________________________________________________
5
Open-Drain SOT µP Reset Circuit
___________________________________________Ordering Information (continued)
NOMINAL MIN t
TOP
MARK
NOMINAL MIN t
TOP
MARK
RP
RP
†
†
PART
PART
††
††
V
(V)
(ms)
V
(V)
(ms)
TH
TH
MAX6315US50D3-T
MAX6315US49D3-T
MAX6315US48D3-T
MAX6315US47D3-T
MAX6315US46D3-T
MAX6315US45D3-T
MAX6315US44D3-T
MAX6315US43D3-T
MAX6315US42D3-T
MAX6315US41D3-T
MAX6315US40D3-T
MAX6315US39D3-T
MAX6315US38D3-T
MAX6315US37D3-T
MAX6315US36D3-T
MAX6315US35D3-T
MAX6315US34D3-T
MAX6315US33D3-T
MAX6315US32D3-T
MAX6315US31D3-T
MAX6315US30D3-T
MAX6315US29D3-T
MAX6315US28D3-T
MAX6315US27D3-T
MAX6315US26D3-T
MAX6315US25D3-T
5.00
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
HX_ _
HY_ _
HZ_ _
IA_ _
IB_ _
IC_ _
ID_ _
IE_ _
IF_ _
IG_ _
IH_ _
II_ _
MAX6315US50D4-T
MAX6315US49D4-T
MAX6315US48D4-T
MAX6315US47D4-T
MAX6315US46D4-T
MAX6315US45D4-T
MAX6315US44D4-T
MAX6315US43D4-T
MAX6315US42D4-T
MAX6315US41D4-T
MAX6315US40D4-T
MAX6315US39D4-T
MAX6315US38D4-T
MAX6315US37D4-T
MAX6315US36D4-T
MAX6315US35D4-T
MAX6315US34D4-T
MAX6315US33D4-T
MAX6315US32D4-T
MAX6315US31D4-T
MAX6315US30D4-T
MAX6315US29D4-T
MAX6315US28D4-T
MAX6315US27D4-T
MAX6315US26D4-T
MAX6315US25D4-T
5.00
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
1120
IX_ _
IY_ _
IZ_ _
4.90
4.80
4.70
4.63
4.50
4.39
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
4.90
4.80
4.70
4.63
4.50
4.39
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
JA_ _
JB_ _
JC_ _
JD_ _
JE_ _
JF_ _
JG_ _
JH_ _
JI_ _
†††
†††
†††
IJ_ _
JJ_ _
JK_ _
JL_ _
JM_ _
JN_ _
JO_ _
JP_ _
JQ_ _
JR_ _
JS_ _
JT_ _
JU_ _
JV_ _
JW_ _
IK_ _
IL_ _
IM_ _
IN_ _
IO_ _
IP_ _
IQ_ _
IR_ _
IS_ _
IT_ _
IU_ _
IV_ _
IW_ _
†††
†††
†††
†††
†
††
†††
The MAX6315 is available in a SOT143 package, -40°C to +125°C temperature range.
The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.
Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.
Note: All devices available in tape-and-reel only. Contact factory for availability.
6
_______________________________________________________________________________________
Open-Drain SOT µP Reset Circuit
___________________Chip Information
TRANSISTOR COUNT: 519
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT-143, 4L
1
21-0052
E
1
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.
7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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