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Linear Technology Electronic Components Datasheet

LTC2918 Datasheet

Low Voltage Supervisor

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FEATURES
9 Selectable Supply Voltages
12V, 5V, 3.3V, 2.5V, 1.8V
1.5V, 1.2V, 1V, +ADJ (0.5V)
3 Selectable Tolerances
–5%, –10%, –15% (LTC2917)
Manual Reset Input (LTC2918)
www.Da1t.a5SVheteot45U..5cVomSupply Operation
Adjustable Watchdog Timeout
Windowed Watchdog Timeout for Higher Reliability
Applications (LTC2917-B, LTC2918-B)
6.2V Shunt Regulator for High Voltage Operation
Guaranteed to 125˚C
Guaranteed Threshold Accuracy: ±1.5%
Low Quiescent Current: 30μA Typical
Power Supply Glitch Immunity
Guaranteed RST for VCC ≥ 0.8V
10-Lead MSOP Packages and (3mm × 2mm) DFN
Packages
APPLICATIONS
Handheld Devices
Cell Phone Base Stations
Automotive Control Systems
Network Servers
Optical Networking Systems
LTC2917/LTC2918
Low Voltage Supervisor
with 27 Selectable Thresh-
olds and Watchdog Timer
DESCRIPTION
The LTC®2917-A/LTC2917-B and LTC2918-A/LTC2918-B
are low voltage single-supply monitors with selectable
thresholds and an adjustable watchdog timer. The parts
operate from 1.5V to 5.5V and consume a quiescent cur-
rent of only 30μA.
Two three state inputs select one of nine internally pro-
grammed thresholds without the need for external resistors.
For the LTC2917, an additional three state input determines
the tolerance (–5%, –10%, –15%). The tolerance for the
LTC2918 is fixed at –5%. Threshold accuracy is guaranteed
at ±1.5% over the entire operating temperature range.
Glitch filtering ensures reliable reset operation without
false triggering.
The reset timeout and the watchdog timeout may be set
with no external components, or adjusted using an exter-
nal capacitor. A windowed watchdog feature is available
for high-reliability applications (B1 versions). A separate
manual reset input on the LTC2918-A/LTC2918-B allows
a simple push button interface.
Operation to 125°C makes the LTC2917-A/LTC2917-B
and LTC2918-A/LTC2918-B suitable for automotive ap-
plications.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
1.8V Supply Monitor with Manual
Reset and Internal Timers Selected
1.8V
0.1μF
10k
VCC
LTC2918-A
VM RST
RT WDI
WT SEL1
MR SEL2
GND
μP
RST
I/O
29178 TA01
tWDU = 1.6s
tRST = 200ms
Monitor Selection Table
NOMINAL VOLTAGE
12V
5V
3.3V
2.5V
1.8V
1.5V
1.2V
1V
ADJ (0.5V)
SEL1
VCC
VCC
VCC
Open
Open
Open
GND
GND
GND
SEL2
VCC
Open
GND
VCC
Open
GND
VCC
Open
GND
29178f
1


Linear Technology Electronic Components Datasheet

LTC2918 Datasheet

Low Voltage Supervisor

No Preview Available !

LTC2917/LTC2918
ABSOLUTE MAXIMUM RATINGS
(Note 1, 2)
Terminal Voltages
VCC (Note 3).......................................... –0.3V to 5.7V
SEL1, SEL2, TOL, WDI, MR, RST ......... –0.3V to 7.5V
VM ......................................................... –0.3V to 15V
RT, WT ......................................–0.3V to (VCC + 0.3)V
Terminal Currents
VCC (Note 3).......................................................±5mA
Operating Temperature Range
LTC2917C/LTC2918C............................... 0°C to 70°C
LTC2917I/LTC2918I ............................. –40°C to 85°C
LTC2917H/LTC2918H ........................ –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP-10 .......................................................... 300°C
wwwP.DIaNtaShCeOet4UN.cFomIGURATION
TOP VIEW
GND 1
TOL 2
SEL2 3
SEL1 4
VM 5
10 RST
9 RT
8 WT
7 WDI
6 VCC
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 200°C/W
LTC2917
TOP VIEW
GND 1
MR 2
SEL2 3
SEL1 4
VM 5
10 RST
9 RT
8 WT
7 WDI
6 VCC
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 200°C/W
LTC2918
TOP VIEW
GND 1
TOL 2
SEL2 3
SEL1 4
VM 5
10 RST
9 RT
11 8 WT
7 WDI
6 VCC
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) PCB GND
CONNECTION OPTIONAL
LTC2917
TOP VIEW
GND 1
MR 2
SEL2 3
SEL1 4
VM 5
10 RST
9 RT
11 8 WT
7 WDI
6 VCC
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 11) PCB GND
CONNECTION OPTIONAL
LTC2918
29178f
2


Part Number LTC2918
Description Low Voltage Supervisor
Maker Linear Technology
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LTC2918 Datasheet PDF






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