OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC2939IMS#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC2938/LTC2939
1
293839ff
V1 (V) V2 (V) V3 (V) V4 (V) V5 (V) V6 (V)
5 3.3 2.5 1.8 ADJ ADJ
5 3.3 2.5 ADJ ADJ ADJ
5 3.3 1.8 ADJ ADJ ADJ
5 3.3 ADJ ADJ ADJ ADJ
5 3.3 ADJ
–ADJ ADJ ADJ
3.3 2.5 1.8 1.5 ADJ ADJ
3.3 2.5 1.8 ADJ ADJ ADJ
3.3 1.8 1.5 1.2 ADJ ADJ
3.3 1.8 1.5 ADJ ADJ ADJ
3.3 1.8 1.2 ADJ ADJ ADJ
3.3 2.5 ADJ ADJ ADJ ADJ
3.3 2.5 ADJ –ADJ ADJ ADJ
3.3 1.8 ADJ ADJ ADJ ADJ
3.3 1.8 ADJ –ADJ ADJ ADJ
3.3 1.5 ADJ ADJ ADJ ADJ
3.3 1.2 ADJ ADJ ADJ ADJ
TYPICAL APPLICATION
DESCRIPTION
Confi gurable 4- and 6-Supply
Monitors with Watchdog Timer
The LTC
®
2938/LTC2939 are confi gurable supply monitors
for systems with up to four or six supply voltages that need
watchdog supervision. One of sixteen preset or adjustable
voltage monitor combinations can be selected using an
external resistive divider connected to the program input.
The preset voltage thresholds are accurate to ±1.5% over
temperature. The LTC2938 and LTC2939 also feature ad-
justable inputs with a 0.5V nominal threshold.
The reset and watchdog timeout periods are adjustable
using external capacitors. Tight voltage threshold accuracy
and glitch immunity ensure reliable reset operation without
false triggering. The RST output is guaranteed to be in the
correct state for V
CC
down to 1V. Each status output has
a weak internal pull-up and may be externally pulled up
to a user-defi ned voltage.
The 80μA supply current makes the LTC2938 and LTC2939
ideal for power conscious systems. The LTC2939 moni-
tors up to six supplies and the LTC2938 monitors up to
four supplies.
6-Supply Monitor 12V (ADJ), 5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ)
FEATURES
APPLICATIONS
n
Simultaneously Monitors Four (LTC2938) or Six
Supplies (LTC2939)
n
Sixteen User-Selectable Combinations of 5V, 3.3V,
2.5V, 1.8V, 1.5V, 1.2V and/or ± Adjustable Voltage
Thresholds
n
Guaranteed Threshold Accuracy: ±1.5%
n
Adjustable Reset and Watchdog Timeout
n
Low Supply Current: 80μA Typical
n
Power Supply Glitch Immunity
n
Guaranteed RST for V
CC
> 1V
n
High Temperature Operation to 125°C
n
12-Pin 4mm × 3mm DFN or 12-Lead MSOP
(LTC2938) and 16-Lead MSOP Package (LTC2939)
n
Desktop and Notebook Computers
n
Multivoltage Systems
n
Telecom Equipment
n
Network Servers
n
Automotive Control Systems
Voltage Confi guration Table
LTC2939
1.2V
1.8V
2.5V
3.3V
5V
12V
293839 TA01
t
RST
= 94ms
t
WD
= 940ms
C
WT
47nF
C
RT
47nF
RST
WDO
WDI
V
PG
V
REF
GND
CWT CRT
V1
V2
V3
V4
V5
V6
SYSTEM
LOGIC
R1
59k
1%
100k
1%
100k
1%
124k
1%
2150k
1%
R2
40.2k
1%
0.1μF
0.1μF
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.
Protected by U.S. Patents, including 6967591, 7239251, 7119714.
LTC2938/LTC2939
2
293839ff
ABSOLUTE MAXIMUM RATINGS
V1, V2, V3, V4, V5, V6, V
PG
......................... –0.3V to 7V
RST .............................................................. –0.3V to 7V
CWT, WDO .................................................... –0.3V to 7V
CRT, V
REF
, WDI ..............................–0.3V to (V
CC
+ 0.3V)
Reference Load Current (I
VREF
) .............................. ±1mA
V4 Input Current (–ADJ Mode) ..............................–1mA
RST, WDO Currents ............................................±10mA
(Notes 1, 2, 3)
12
11
10
9
8
7
13
1
2
3
4
5
6
V2
V4
V
REF
V
PG
GND
CWT
V3
V1
CRT
RST
WDO
WDI
TOP VIEW
DE PACKAGE
12-LEAD (4mm s 3mm) PLASTIC DFN
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
1
2
3
4
5
6
V3
V1
CRT
RST
WDO
WDI
12
11
10
9
8
7
V2
V4
V
REF
V
PG
GND
CWT
TOP VIEW
MS PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 130°C/W
1
2
3
4
5
6
7
8
V5
V3
V1
NC
CRT
RST
WDO
WDI
16
15
14
13
12
11
10
9
V6
V2
V4
NC
V
REF
V
PG
GND
CWT
TOP VIEW
MS PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 110°C/W
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2938CDE#PBF LTC2938CDE#TRPBF 2938
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LTC2938IDE#PBF LTC2938IDE#TRPBF 2938
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LTC2938HDE#PBF LTC2938HDE#TRPBF 2938
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC2938CMS#PBF LTC2938CMS#TRPBF 2938 12-Lead Plastic MSOP 0°C to 70°C
LTC2938IMS#PBF LTC2938IMS#TRPBF 2938 12-Lead Plastic MSOP –40°C to 85°C
LTC2938HMS#PBF LTC2938HMS#TRPBF 2938 12-Lead Plastic MSOP –40°C to 125°C
LTC2939CMS#PBF LTC2939CMS#TRPBF 2939 16-Lead Plastic MSOP 0°C to 70°C
LTC2939IMS#PBF LTC2939IMS#TRPBF 2939 16-Lead Plastic MSOP –40°C to 85°C
LTC2939HMS#PBF LTC2939HMS#TRPBF 2939 16-Lead Plastic MSOP –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
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/
Operating Temperature Range
LTC2939C ..................................................... 0°C to 70°C
LTC2939I .................................................. –40°C to 85°C
LTC2939H .............................................. –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering 10 sec)
MS Package Only .............................................. 300°C
LTC2938 LTC2938 LTC2939
LTC2938/LTC2939
3
293839ff
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Minimum Internal Operating Voltage RST in Correct Logic State
l
1V
V
CCMINP
Minimum Required for Confi guration V
CC
Rising
l
2.6 V
V
RT50
5V, 5% Reset Threshold V1 Input Threshold
l
4.600 4.675 4.750 V
V
RT33
3.3V, 5% Reset Threshold V1, V2 Input Threshold
l
3.036 3.086 3.135 V
V
RT25
2.5V, 5% Reset Threshold V2, V3 Input Threshold
l
2.300 2.338 2.375 V
V
RT18
1.8V, 5% Reset Threshold V2, V3, V4 Input Threshold
l
1.656 1.683 1.710 V
V
RT15
1.5V, 5% Reset Threshold V2, V3, V4 Input Threshold
l
1.380 1.403 1.425 V
V
RT12
1.2V, 5% Reset Threshold V2, V3, V4 Input Threshold
l
1.104 1.122 1.140 V
V
RTA
ADJ Reset Threshold V3, V4, V5, V6 Input Threshold
l
492.5 500 507.5 mV
V
RTAN
–ADJ Reset Threshold V4 Input Threshold
l
–18 0 18 mV
V
REF
Reference Voltage V
CC
> 2.3V, I
VREF
= ±1mA,
C
REF
< 1000pF
l
1.192 1.210 1.228 V
V
PG
Confi guration Voltage Range V
CC
> V
CCMINP
l
0V
REF
V
I
VPG
V
PG
Input Current V
PG
= V
REF
l
±20 nA
I
V1
V1 Input Current V1 = 5V, I
VREF
= 12μA, (Note 4)
l
80 125 μA
I
V2
V2 Input Current V2 = 3.3V
l
0.8 2 μA
I
V3
V3 Input Current V3 = 2.5V
V3 = 0.55V (ADJ Mode)
l
l
0.52 1.2
±15
μA
nA
I
V4
V4 Input Current V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = -0.02V (–ADJ Mode)
l
l
l
0.34 0.8
±15
±15
μA
nA
nA
I
V5
, I
V6
V5, V6 Input Current (LTC2939) V5, V6 = 0.55V
l
±15 nA
I
CRT(UP)
CRT Pull-Up Current V
CRT
= GND
l
–1.4 –2 –2.6 μA
I
CRT(DN)
CRT Pull-Down Current V
CRT
= 1.3V
l
10 20 30 μA
t
RST
Reset Timeout Period C
RT
= 1500pF
l
234 ms
t
UV
V
n
Undervoltage Detect to RST V
n
Less Than Reset Threshold V
RTX
by
More Than 1%
150 μs
V
OL
Voltage Output Low RST I
SINK
= 2.5mA; V
CC
= 3V
l
0.15 0.4 V
I
SINK
= 100μA; V
CC
= 1V
l
0.05 0.3 V
V
OL
Voltage Output Low WDO I
SINK
= 2.5mA; V
CC
= 3.3V
l
0.15 0.4 V
V
OH
Voltage Output High RST, WDO
(Note 5)
I
SOURCE
= –1μA; V2 = 3.3V
l
V2 – 1 V
I
CWT(UP)
CWT Pull-Up Current V
CWT
= GND
l
–1.4 –2 –2.6 μA
I
CWT(DN)
CWT Pull-Down Current V
CWT
= 1.3V
l
10 20 30 μA
t
WD
Watchdog Timeout Period C
WT
= 1500pF
l
20 30 40 ms
V
WDI
WDI Input Threshold
(V
CC
= 3.3V to 5.5V)
Logic Low
Open
Logic High
l
l
l
0.7
1.4
0.9
0.4
1.1
V
V
V
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
= 5V unless otherwise specifi ed. (Note 3)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2939IMS#PBF

Mfr. #:
Buy LTC2939IMS#PBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Configurable Six Supply Monitor with Watchdog Timer
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet