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PDF MAX6366 Data sheet ( Hoja de datos )
| Número de pieza | MAX6366 | |
| Descripción | SOT23 / Low-Power P Supervisory Circuits with Battery Backup and Chip-Enable Gating | |
| Fabricantes | Maxim Integrated | |
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19-1658; Rev 1; 6/01
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup and Chip-Enable Gating
General Description
The MAX6365–MAX6368 supervisory circuits simplify
power-supply monitoring, battery-backup control func-
tions, and memory write protection in microprocessor
(µP) systems. The circuits significantly improve the size,
accuracy, and reliability of modern systems with an ultra-
small integrated solution.
These devices perform four basic system functions:
1) Provide a µP reset output during VCC supply power-
up, power-down, and brownout conditions.
2) Internally control VCC to backup-battery switching to
maintain data or low-power operation for CMOS
RAM, CMOS µPs, real-time clocks, and other digital
logic when the main supply fails.
3) Provide memory write protection through internal
chip-enable gating during supply or processor faults.
4) Include one of the following options: a manual reset
input (MAX6365), a watchdog timer function
(MAX6366), a battery-on output (MAX6367), or an
auxiliary user-adjustable reset input (MAX6368).
The MAX6365–MAX6368 operate from VCC supply volt-
ages as low as 1.2V. The factory preset reset threshold
voltages range from 2.32V to 4.63V (see Ordering
Information). In addition, each part is offered in three
reset output versions: push-pull active low, open-drain
active low, or open-drain active high (see Selector
Guide). The MAX6365–MAX6368 are available in minia-
ture 8-pin SOT23 packages.
Applications
Critical µP/µC Power
Monitoring
Portable/Battery-
Powered Equipment
Fax Machines
Set-Top Boxes
Industrial Control
POS Equipment
Computers/Controllers
Pin Configurations
TOP VIEW
RESET, RESET 1
CE IN 2
GND 3
MR 4
MAX6365
8 CE OUT
7 BATT
6 OUT
5 VCC
Features
o Low +1.2V Operating Supply Voltage (VCC or VBATT)
o Precision Monitoring of +5.0V, +3.3V, +3.0V, and
+2.5V Power-Supply Voltages
o On-Board Gating of Chip-Enable Signals, 1.5ns
Propagation Delay
o Debounced Manual Reset Input (MAX6365)
o Watchdog Timer, 1.6s Timeout (MAX6366)
o Battery-On Output Indicator (MAX6367)
o Auxiliary User-Adjustable RESET IN (MAX6368)
o Low 10µA Quiescent Supply Current
o Three Available Output Structures
Push-Pull RESET
Open-Drain RESET
Open-Drain RESET
o RESET/RESET Valid Down to 1.2V Guaranteed
(VCC or VBATT)
o Power-Supply Transient Immunity
o 150ms min Reset Timeout Period
o Miniature 8-Pin SOT23 Package
Ordering Information
PART*
TEMP. RANGE
PIN-
PACKAGE
MAX6365LKA_ _-T
-40°C to +85°C
8 SOT23-8
MAX6365PKA_ _-T
-40°C to +85°C
8 SOT23-8
MAX6365HKA_ _-T
-40°C to +85°C
8 SOT23-8
MAX6366LKA_ _-T
MAX6366PKA_ _-T
MAX6366HKA_ _-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
8 SOT23-8
8 SOT23-8
8 SOT23-8
MAX6367LKA_ _-T
-40°C to +85°C
8 SOT23-8
MAX6367PKA_ _-T
MAX6367HKA_ _-T
-40°C to +85°C
-40°C to +85°C
8 SOT23-8
8 SOT23-8
MAX6368LKA_ _-T
MAX6368PKA_ _-T
-40°C to +85°C
-40°C to +85°C
8 SOT23-8
8 SOT23-8
MAX6368HKA_ _-T
-40°C to +85°C
8 SOT23-8
*These parts offer a choice of reset threshold voltages. From the
Reset Threshold Ranges table, insert the desired threshold volt-
age code in the blank to complete the part number. SOT parts
come in tape-and-reel only and must be ordered in 2500-piece
increments. See Device Marking Codes for a complete parts list,
including SOT top marks and standard threshold versions. See
Selector Guide for a listing of device features.
SOT23
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears 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.
1 page  
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup and Chip-Enable Gating
(TA = +25°C, unless otherwise noted.)
VCC TO OUT ON-RESISTANCE
vs. TEMPERATURE
1.4
1.2 VCC = 2.3V
IOUT = 25mA
1.0
0.8
0.6
VCC = 3.0V
0.4 IOUT = 65mA
VCC = 4.5V
0.2 IOUT = 150mA
0
-40 -20
0
20 40 60
TEMPERATURE (°C)
80
RESET THRESHOLD
vs. TEMPERATURE
5.0
MAX636_ 46 (VTH = 4.63V)
4.5
4.0
3.5
3.0
MAX636_ 26 (VTH = 2.63V)
2.5
2.0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
Typical Operating Characteristics (continued)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
210
205
200
195
190
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
400
350
300
250 MAX636_ 46
(VTH = 4.63V)
200
150
RESET OCCURS
ABOVE CURVE
100
50 MAX636_ 26
(VTH = 2.63V)
0
1 10 100 1000 10,000
RESET THRESHOLD OVERDRIVE VTH - VCC (mV)
VCC TO RESET PROPAGATION DELAY
vs. TEMPERATURE
135
VCC FALLING
120
105
0.25V/ms
90
75
60
45
1V/ms
30
15 10V/ms
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
10
9
8
7
6
5
4
3
2
1
0
0
BATTERY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
VTH = 2.93V
VBATT = 2.8V
VBATT = 2.5V
VBATT = 2.3V
0.5 1.0 1.5 2.0 2.5 3.0 3.5
VCC (V)
_______________________________________________________________________________________ 5
5 Page 
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup and Chip-Enable Gating
watchdog is set low in the beginning of the program,
set high at the beginning of every subroutine or loop,
and set low again when the program returns to the
beginning. If the program should hang in any subrou-
tine, the problem would be quickly corrected.
Replacing the Backup Battery
When VCC is above VTH, the backup power source can
be removed without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
VCC stays above the reset threshold voltage.
Negative-Going VCC Transients
These supervisors are relatively immune to short-dura-
tion, negative-going VCC transients. Resetting the µP
when VCC experiences only small glitches is usually not
desirable.
The Typical Operating Characteristics section has a
Maximum Transient Duration vs. Reset Threshold
Overdrive graph for which reset is not asserted. The
graph was produced using negative-going VCC pulses,
starting at VCC and ending below the reset threshold by
the magnitude indicated (reset threshold overdrive).
The graph shows the maximum pulse width that a neg-
ative-going VCC transient can typically have without
triggering a reset pulse. As the amplitude of the tran-
sient increases (i.e., goes further below the reset
threshold), the maximum allowable pulse width
decreases. Typically, a VCC transient that goes 100mV
below the reset threshold and lasts for 30µs will not trig-
ger a reset pulse.
A 0.1µF bypass capacitor mounted close to the VCC
pin provides additional transient immunity.
+2.4V TO +5.5V
0.1µF
START
VCC BATT ON
OUT
BATT CE OUT
CE
MAX6367
CE IN
ADDRESS
DECODE
GND RESET
CMOS RAM
A0–A15
µP
RESET
Figure 3. MAX6367 BATT ON Driving an External Pass
Transistor
SET
WDI
LOW
SUBROUTINE
OR PROGRAM LOOP
SET WDI
HIGH
RETURN
END
Figure 4. Watchdog Flow Diagram
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX6366.PDF ] | |
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