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LTC692IS8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC692/LTC693
1
0692fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Microprocessor
Supervisory Circuits
n
Critical μP Power Monitoring
n
Intelligent Instruments
n
Battery-Powered Computers and Controllers
n
Automotive Systems
RESET Output Voltage vs
Supply Voltage
n
Guaranteed Reset Assertion at V
CC
= 1V
n
1.5mA Maximum Supply Current
n
Fast (35ns Maximum) Onboard Gating of RAM Chip
Enable Signals
n
4.40V Precision Voltage Monitor
n
Power OK/Reset Time Delay: 200ms or Adjustable
n
Minimum External Component Count
n
1μA Maximum Standby Current
n
Voltage Monitor for Power-Fail or Low Battery
Warning
n
Thermal Limiting
n
Performance Specifi ed Over Temperature
n
Superior Upgrade for MAX690 Family
n
SO8 and SO16 Packaging
The LTC
®
692/LTC693 provide complete power supply
monitoring and battery control functions for microproces-
sor reset, battery backup, CMOS RAM write protection,
power failure warning and watchdog timing. A precise
internal voltage reference and comparator circuit monitor
the power supply line. When an out-of-tolerance condition
occurs, the reset outputs are forced to active states and the
chip enable output unconditionally write-protects external
memory. In addition, the RESET output is guaranteed to
remain logic low even with V
CC
as low as 1V.
The LTC692/LTC693 power the active CMOS RAMs with a
charge-pumped NMOS power switch to achieve low drop-
out and low supply current. When primary power is lost,
auxiliary power, connected to the battery input pin, powers
the RAMs in standby through an effi cient PMOS switch.
For an early warning of impending power failure, the
LTC692/LTC693 provide an internal comparator with a
user-defi ned threshold. An internal watchdog timer is
also available, which forces the reset pins to active states
when the watchdog input is not toggled prior to a preset
timeout period.
ADJ
V
IN
V
OUT
10μF
V
IN
≥ 7.5V
5V
100μF
0.1μF
μP NMI
μP
POWER
POWER TO
CMOS RAM
I/O LINE
μP RESET
μP
SYSTEM
0.1μF
3V
51k
10k
692_3 • TA01
LT1086-5
MICROPROCESSOR RESET, BATTERY BACKUP, POWER FAILURE
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR MICROPROCESSOR SYSTEMS
GND
0.1μF
100Ω
+ +
LTC692
LTC693
V
BATT
PFI
WDI
RESET
PFO
V
OUT
V
CC
SUPPLY VOLTAGE (V)
0
RESET OUTPUT VOLTAGE (V)
3
4
5
4
2
1
0
1
2
3
5
T
A
= 25°C
EXTERNAL PULL-UP = 10μA
V
BATT
= 0V
692_3 • TA02
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners..
LTC692/LTC693
2
0692fb
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage
V
CC
...................................................... –0.3V to 6.0V
V
BATT
................................................... –0.3V to 6.0V
All Other Inputs ..................... –0.3V to (V
OUT
+ 0.3V)
Input Current
V
CC
................................................................. 200mA
V
BATT
................................................................ 50mA
GND ................................................................. 20mA
(Notes 1, 2)
1
2
3
4
8
7
6
5
TOP VIEW
V
OUT
V
CC
GND
PFI
V
BATT
RESET
WDI
PFO
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 110°C, θ
JA
= 130°C/W (N)
T
JMAX
= 110°C, θ
JA
= 180°C/W (S)
S8 PACKAGE CONDITIONS: PCB MOUNT ON FR4 MATERIAL,
STILL AIR AT 25°C, COPPER TRACE
1
2
3
4
5
6
7
8
TOP VIEW
N PACKAGE
16-LEAD PDIP
16
15
14
13
12
11
10
9
V
BATT
V
OUT
V
CC
GND
BATT ON
LOW LINE
OSC IN
OSC SEL
RESET
RESET
WDO
CE IN
CE OUT
WDI
PFO
PFI
SW PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 110°C, θ
JA
= 130°C/W
S16 PACKAGE CONDITIONS: PCB MOUNT ON FR4 MATERIAL,
STILL AIR AT 25°C, COPPER TRACE
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC692CN8#PBF LTC692CN8#TRPBF LTC692CN8 8-Lead Plastic DIP 0°C to 70°C
LTC692CS8#PBF LTC692CS8#TRPBF 692 8-Lead Plastic SO 0°C to 70°C
LTC692IS8#PBF LTC692IS8#TRPBF 692I 8-Lead Plastic SO –40°C to 85°C
LTC693CN#PBF LTC693CN#TRPBF LTC693CN 16-Lead Plastic DIP 0°C to 70°C
LTC693CS#PBF LTC693CS#TRPBF LTC693CS 16-Lead Plastic SO 0°C to 70°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
V
OUT
Output Current ................. Short-Circuit Protected
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC692C/LTC693C ................................. 0°C to 70°C
LTC692I .............................................. –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................ 300°C
LTC692/LTC693
3
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ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Battery Backup Switching
Operating Voltage Range
V
CC
V
BATT
4.50
2.00
5.50
4.00
V
V
V
OUT
Output Voltage I
OUT
= 1mA
l
V
CC
– 0.05
V
CC
– 0.10
V
CC
– 0.005
V
CC
– 0.005
V
V
I
OUT
= 50mA V
CC
– 0.50 V
CC
– 0.250 V
V
OUT
in Battery Backup Mode I
OUT
= 250μA, V
CC
< V
BATT
V
BATT
– 0.1 V
BATT
– 0.02 V
Supply Current (Exclude I
OUT
)I
OUT
≤ 50mA
l
0.6
0.6
1.5
2.5
mA
mA
Supply Current in Battery Backup Mode V
CC
= 0V, V
BATT
= 2.8V
l
0.04
0.04
1
5
μA
μA
Battery Standby Current
(+ = Discharge, – = Charge)
5.5V > V
CC
> V
BATT
+ 0.2V
l
–0.1
–1.0
0.02
0.10
μA
μA
Battery Switchover Threshold
V
CC
– V
BATT
Power Up
Power Down
70
50
mV
mV
Battery Switchover Hysteresis 20 mV
BATT ON Output Voltage (Note 4) I
SINK
= 3.2mA 0.4 V
BATT ON Output Short-Circuit Current (Note 4) BATT ON = V
OUT
, Sink Current
BATT ON = 0V, Source Current 0.5
35
125
mA
μA
Reset and Watchdog Timer
Reset Voltage Threshold
l
4.25 4.40 4.50 V
Reset Threshold Hysteresis 40 mV
Reset Active Time
(Note 5)
OSC SEL High, V
CC
= 5V
l
160
140
200
200
240
280
ms
ms
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= full operating range, V
BATT
= 2.8V, unless otherwise noted.
PRODUCT SELECTION GUIDE
PINS
RESET
THRESHOLD
(V)
WATCHDOG
TIMER
BATTERY
BACKUP
POWER-FAIL
WARNING
RAM WRITE-
PROTECT
PUSHBUTTON
RESET
CONDITIONAL
BATTERY
BACKUP
LTC692 8 4.40 X X X
LTC693 16 4.40 X X X X
LTC690 8 4.65 X X X
LTC691 16 4.65 X X X X
LTC694 8 4.65 X X X
LTC695 16 4.65 X X X X
LTC699 8 4.65 X
LTC1232 8 4.37/4.62 X X
LTC1235 16 4.65 X X X X X X
LTC694-3.3 8 2.90 X X X
LTC695-3.3 16 2.90 X X X X
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC692IS8#TRPBF

Mfr. #:
Buy LTC692IS8#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits uP Supervisor with Watchdog
Lifecycle:
New from this manufacturer.
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