ltc2917cddb-b1-trpbf Linear Technology Corporation, ltc2917cddb-b1-trpbf Datasheet

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ltc2917cddb-b1-trpbf

Manufacturer Part Number
ltc2917cddb-b1-trpbf
Description
Ltc2918 - Voltage Supervisor With 27 Selectable Thresholds And Watchdog Timer
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
TYPICAL APPLICATION
9 Selectable Supply Voltages
3 Selectable Tolerances
Manual Reset Input (LTC2918)
1.5V to 5.5V Supply Operation
Adjustable Watchdog Timeout
Windowed Watchdog Timeout for Higher Reliability
Applications (LTC2917-B, LTC2918-B)
6.2V Shunt Regulator for High Voltage Operation
Guaranteed Operation to 125°C
Guaranteed Threshold Accuracy: ±1.5%
Low Quiescent Current: 30μA Typical
Power Supply Glitch Immunity
Guaranteed RST for V
10-Lead MSOP Packages and (3mm × 2mm) DFN
Packages
Handheld Devices
Cell Phone Base Stations
Automotive Control Systems
Network Servers
Optical Networking Systems
12V, 5V, 3.3V, 2.5V, 1.8V
1.5V, 1.2V, 1V, +ADJ (0.5V)
–5%, –10%, –15% (LTC2917)
0.1μF
Reset and Internal Timers Selected
1.8V Supply Monitor with Manual
VM
RT
WT
MR
LTC2918-A
GND
V
CC
SEL1
SEL2
RST
WDI
CC
1.8V
≥ 0.8V
t
t
WDU
RST
= 200ms
= 1.6s
10k
RST
I/O
μP
29178 TA01
DESCRIPTION
The LTC
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 fi xed at –5%. Threshold accuracy is guaranteed
at ±1.5% over the entire operating temperature range.
Glitch fi ltering 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
applications.
All other trademarks are the property of their respective owners.
NOMINAL VOLTAGE
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
27 Selectable Thresholds
ADJ (0.5V)
Voltage Supervisor with
3.3V
2.5V
1.8V
1.5V
1.2V
12V
®
5V
1V
2917-A/LTC2917-B and LTC2918-A/LTC2918-B
and Watchdog Timer
Monitor Selection Table
LTC2917/LTC2918
SEL1
Open
Open
Open
GND
GND
GND
V
V
V
CC
CC
CC
SEL2
Open
Open
Open
GND
GND
GND
V
V
V
CC
CC
CC
29178fb
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ltc2917cddb-b1-trpbf Summary of contents

Page 1

... 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 applications. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. NOMINAL VOLTAGE 12V 5V 3 ...

Page 2

LTC2917/LTC2918 ABSOLUTE MAXIMUM RATINGS Terminal Voltages V (Note 3) .......................................... –0.3V to 5.7V CC SEL1, SEL2, TOL, WDI, MR, RST ......... –0.3V to 7.5V VM ......................................................... –0.3V to 15V RT, WT .......................................–0. Terminal Currents V (Note 3) .......................................................±5mA ...

Page 3

... TAPE AND REEL (MINI) TAPE AND REEL LTC2917CDDB-B1#TRMPBF LTC2917CDDB-B1#TRPBF LTC2917IDDB-B1#TRMPBF LTC2917IDDB-B1#TRPBF LTC2917HDDB-B1#TRMPBF LTC2917HDDB-B1#TRPBF LTC2917CDDB-A1#TRMPBF LTC2917CDDB-A1#TRPBF LTC2917IDDB-A1#TRMPBF LTC2917IDDB-A1#TRPBF LTC2917HDDB-A1#TRMPBF LTC2917HDDB-A1#TRPBF LTC2918CDDB-B1#TRMPBF LTC2918CDDB-B1#TRPBF LTC2918IDDB-B1#TRMPBF LTC2918IDDB-B1#TRPBF LTC2918HDDB-B1#TRMPBF ...

Page 4

LTC2917/LTC2918 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V Minimum Supply Voltage CC(MIN) V Supply Undervoltage Lockout CC(UVLO) V Shunt Regulation Voltage CC(SHUNT Pin Current CC CC Monitor Input (VM) V 12V, 5% ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Reset Output (RST) t Internal Reset Timeout Period RST(INT) t Adjustable Reset Timeout Period RST(EXT) VM Undervoltage Detect to RST t UV Asserted Output Voltage Low RST V ...

Page 6

LTC2917/LTC2918 TYPICAL PERFORMANCE CHARACTERISTICS Threshold Voltage vs Temperature 1.5 1.0 0.5 V MTADJ 0 –0 MT25 MT120 –1.0 –1.5 –50 – 100 TEMPERATURE (°C) 29178 G01 Reset Timeout Period vs RT Capacitance 10000 1000 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS RST Output Voltage 10k PULL- SEL1 = SEL2 = TOL = 0. SUPPLY VOLTAGE, V ...

Page 8

LTC2917/LTC2918 BLOCK DIAGRAM SEL1 SEL2 3 STATE DECODE MONITOR VM DIVIDER MATRIX REFERENCE DIVIDER MATRIX + 0.5V – TIMING DIAGRAMS WDI RST WDI RST 8 LTC2917 LTC2918 TOL 100k INTERNAL 200ms TIMER – + ADJUSTABLE RESET ...

Page 9

APPLICATIONS INFORMATION Supply Monitoring The LTC2917/LTC2918 are low voltage single supply monitors with selectable thresholds. Two three-state inputs select one of nine internally programmed thresholds. For the LTC2917, a third three-state input selects the tolerance at which the supply connected ...

Page 10

LTC2917/LTC2918 APPLICATIONS INFORMATION Threshold Accuracy The trip threshold for the supplies monitored is selected by confi guring the three-state input pins. When using the adjustable input, a external resistive divider sets the trip threshold, allowing the user complete control over ...

Page 11

APPLICATIONS INFORMATION The reference input of the comparator is controlled by the tolerance pin. The external resistive divider should make the voltage 0.5V when the supply is at nominal value. The actual threshold of VM accounts for ...

Page 12

LTC2917/LTC2918 APPLICATIONS INFORMATION LTC2917-B/LTC2918-B For applications in which reliability is even more critical, the LTC2917-B/LTC2918-B implements a windowed watch- dog function by adding a lower boundary condition to the standard watchdog function. If the WDI input receives a falling edge ...

Page 13

TYPICAL APPLICATIONS 1V Supply Monitor with Windowed Watchdog Timeout and Internal Timers Selected 3. BYPASS 0.1μF 10k V CC LTC2917 RST SEL1 WDI SEL2 TOL GND WT RT 3.3V 1.8V 12V Supply Monitor with 20ms Reset ...

Page 14

LTC2917/LTC2918 TYPICAL APPLICATIONS 3.3V, –10% Tolerance Supply Monitor with Disabled Watchdog 3.3V C BYPASS 0.1μ LTC2917 VM RST SEL1 WDI SEL2 TOL GND 1.5V Supply Monitor with Tolerance Control for Margining, 14 1.8V, –5% ...

Page 15

... SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... MSOP and 3mm × 2mm DFN-10 Packages Manual Reset, 10-Lead MSOP and 3mm × 2mm DFN-10 Packages www.linear.com ● 10k V CC μP RST I/O GND 29178 TA10 1.8V Pin, RST/RST Outputs CC Pin, Adjustable Reset Timer CC LT 0208 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2007 29178fb ...

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