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LTC2935CTS8-2#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LTC2935
1
2935fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Ultra-Low Power Supervisor
with Power-Fail Output,
Selectable Thresholds
The LTC
®
2935 ultra-low power voltage monitor provides
system initialization, power-fail warning and reset gen-
eration functions. Low quiescent current (500nA typical)
makes the LTC2935 an ideal choice for battery-operated
applications.
Three binary threshold-select inputs confi gure one of
eight integrated reset thresholds, ranging from 1.6V to
3.45V in pre-determined increments. Early warning of an
impending low voltage condition is provided at the power-
fail output (PFO), whose threshold is above the confi gured
reset threshold. Supervisory circuits monitor V
CC
and
pull RST low when V
CC
drops below the confi gured reset
threshold. When V
CC
is rising from an under-threshold
condition, an internal reset timer is started after exceeding
the reset threshold by 5%. A 200ms reset timeout delays
the return of the RST output to a high state. A pushbut-
ton switch connected to the MR input is typically used to
force a manual reset. Outputs RST and PFO are available
with open-drain (LTC2935-1/LTC2935-3) or active pull-up
(LTC2935-2/LTC2935-4) circuits. Operating temperature
range is from –40°C to 85°C.
Confi gurable Low Power Voltage Monitor
n
500nA Quiescent Current
n
±1.5% (Max) Accuracy over Temperature
n
Integrated Precision Attenuators
n
Eight Pin-Selectable Reset Thresholds
n
Eight Pin-Selectable Power-Fail Thresholds
n
Early Warning Power-Fail Output
n
200ms Reset Timeout
n
Manual Reset Input
n
Compact 8-Lead, 2mm × 2mm DFN and
TSOT-23 (ThinSOT™) Packages
n
Portable Equipment
n
Battery-Powered Equipment
n
Security Systems
n
Point-of-Sale Devices
n
Wireless Systems
Falling Threshold Selection Table
V
CC
V
IN
BATTERY
POWERED
SYSTEM
LOGIC
2935 TA01a
S2
S1
0.1μF
PFO
RST
S0
MR
LTC2935-2
GND
LTC2935-1/LTC2935-2 LTC2935-3/LTC2935-4
RESET
THRESHOLD
(V)
POWER-FAIL
THRESHOLD
(V)
RESET
THRESHOLD
(V)
POWER-FAIL
THRESHOLD
(V) S2S1S0
3.30 3.45 2.44 2.56 Low Low Low
3.15 3.30 2.32 2.44 Low Low High
3.00 3.15 2.20 2.32 Low High High
2.85 3.00 2.08 2.20 Low High Low
2.70 2.85 1.96 2.08 High High Low
2.55 2.70 1.84 1.96 High Low Low
2.40 2.55 1.72 1.84 High Low High
2.25 2.40 1.60 1.72 High High High
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC2935
2
2935fa
ABSOLUTE MAXIMUM RATINGS
Input Voltages
V
CC
........................................................... –0.3V to 6V
S2, S1, S0, MR .........................–0.3V to (V
CC
+ 0.3V)
Output Voltages (PFO, RST)
LTC2935-1/LTC2935-3 ............................. –0.3V to 6V
LTC2935-2/LTC2935-4 ..............–0.3V to (V
CC
+ 0.3V)
RMS Currents
PFO, RST ..........................................................±5mA
(Notes 1, 2)
TOP VIEW
V
CC
MR
RST
PFO
S2
S1
S0
GND
DC PACKAGE
8-LEAD (2mm s 2mm) PLASTIC DFN
9
4
1
2
3
6
5
7
8
T
JMAX
= 125°C, θ
JA
= 102°C/W
EXPOSED PAD (PIN 9), PCB GND CONNECTION OPTIONAL
V
CC
MR
RST
PFO
S2 1
S1 2
S0 3
GND 4
8
7
6
5
TOP VIEW
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C, θ
JA
= 195°C/W
PIN CONFIGURATION
Operating Ambient Temperature Range
LTC2935C ................................................ 0°C to 70°C
LTC2935I.............................................. –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 Package .............................................. 300°C
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2935CTS8-1#TRMPBF LTC2935CTS8-1#TRPBF LTDPW 8-Lead Plastic TSOT-23 0°C to 70°C
LTC2935ITS8-1#TRMPBF LTC2935ITS8-1#TRPBF LTDPW 8-Lead Plastic TSOT-23 –40°C to 85°C
LTC2935CTS8-2#TRMPBF LTC2935CTS8-2#TRPBF LTDQB 8-Lead Plastic TSOT-23 0°C to 70°C
LTC2935ITS8-2#TRMPBF LTC2935ITS8-2#TRPBF LTDQB 8-Lead Plastic TSOT-23 –40°C to 85°C
LTC2935CTS8-3#TRMPBF LTC2935CTS8-3#TRPBF LTFHV 8-Lead Plastic TSOT-23 0°C to 70°C
LTC2935ITS8-3#TRMPBF LTC2935ITS8-3#TRPBF LTFHV 8-Lead Plastic TSOT-23 –40°C to 85°C
LTC2935CTS8-4#TRMPBF LTC2935CTS8-4#TRPBF LTFHX 8-Lead Plastic TSOT-23 0°C to 70°C
LTC2935ITS8-4#TRMPBF LTC2935ITS8-4#TRPBF LTFHX 8-Lead Plastic TSOT-23 –40°C to 85°C
LTC2935CDC-1#TRMPBF LTC2935CDC-1#TRPBF LDPX
8-Lead (2mm × 2mm) Plastic DFN
0°C to 70°C
LTC2935IDC-1#TRMPBF LTC2935IDC-1#TRPBF LDPX
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC2935CDC-2#TRMPBF LTC2935CDC-2#TRPBF LDQC
8-Lead (2mm × 2mm) Plastic DFN
0°C to 70°C
LTC2935IDC-2#TRMPBF LTC2935IDC-2#TRPBF LDQC
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC2935CDC-3#TRMPBF LTC2935CDC-3#TRPBF LFHW
8-Lead (2mm × 2mm) Plastic DFN
0°C to 70°C
LTC2935IDC-3#TRMPBF LTC2935IDC-3#TRPBF LFHW
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC2935CDC-4#TRMPBF LTC2935CDC-4#TRPBF LFHY
8-Lead (2mm × 2mm) Plastic DFN
0°C to 70°C
LTC2935IDC-4#TRMPBF LTC2935IDC-4#TRPBF LFHY
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
TRM = 500 pieces. *Temperature grades are identifi ed by a label on the shipping container.
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on 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/
LTC2935
3
2935fa
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
V
CC
Input Supply Voltage
l
5.5 V
I
CC
V
CC
Input Supply Current
l
225 500 1000 nA
Reset Thresholds (LTC2935-1/LTC2935-2)
V
RTF1
Reset Threshold 1 (V
CC
Falling) S2 = Low : S1 = Low : S0 = Low
l
3.251 3.300 3.349 V
V
RTF2
Reset Threshold 2 (V
CC
Falling) S2 = Low : S1 = Low : S0 = High
l
3.103 3.150 3.197 V
V
RTF3
Reset Threshold 3 (V
CC
Falling) S2 = Low : S1 = High : S0 = High
l
2.955 3.000 3.045 V
V
RTF4
Reset Threshold 4 (V
CC
Falling) S2 = Low : S1 = High : S0 = Low
l
2.808 2.850 2.892 V
V
RTF5
Reset Threshold 5 (V
CC
Falling) S2 = High : S1 = High : S0 = Low
l
2.660 2.700 2.740 V
V
RTF6
Reset Threshold 6 (V
CC
Falling) S2 = High : S1 = Low : S0 = Low
l
2.512 2.550 2.588 V
V
RTF7
Reset Threshold 7 (V
CC
Falling) S2 = High : S1 = Low : S0 = High
l
2.364 2.400 2.436 V
V
RTF8
Reset Threshold 8 (V
CC
Falling) S2 = High : S1 = High : S0 = High
l
2.217 2.250 2.283 V
ΔV
RTF
Reset Threshold Differential V
RTF(N+1)
– V
RTF(N)
(Note 3)
l
142 150 158 mV
V
RT(HYST)
Reset Threshold Hysteresis (V
CC
Rising) Relative to Any Selected Reset Threshold
l
4.5 5 6 %
t
UVR
Undervoltage Detect to RST Falling V
CC
Below Threshold by 1% (Note 3) 1 ms
Reset Thresholds (LTC2935-3/LTC2935-4)
V
RTF1
Reset Threshold 1 (V
CC
Falling) S2 = Low : S1 = Low : S0 = Low
l
2.404 2.440 2.476 V
V
RTF2
Reset Threshold 2 (V
CC
Falling) S2 = Low : S1 = Low : S0 = High
l
2.286 2.320 2.354 V
V
RTF3
Reset Threshold 3 (V
CC
Falling) S2 = Low : S1 = High : S0 = High
l
2.167 2.200 2.233 V
V
RTF4
Reset Threshold 4 (V
CC
Falling) S2 = Low : S1 = High : S0 = Low
l
2.049 2.080 2.111 V
V
RTF5
Reset Threshold 5 (V
CC
Falling) S2 = High : S1 = High : S0 = Low
l
1.931 1.960 1.989 V
V
RTF6
Reset Threshold 6 (V
CC
Falling) S2 = High : S1 = Low : S0 = Low
l
1.813 1.840 1.867 V
V
RTF7
Reset Threshold 7 (V
CC
Falling) S2 = High : S1 = Low : S0 = High
l
1.695 1.720 1.745 V
V
RTF8
Reset Threshold 8 (V
CC
Falling) S2 = High : S1 = High : S0 = High
l
1.576 1.600 1.624 V
ΔV
RTF
Reset Threshold Differential V
RTF(N+1)
– V
RTF(N)
(Note 3)
l
112 120 128 mV
V
RT(HYST)
Reset Threshold Hysteresis (V
CC
Rising) Relative to Any Selected Reset Threshold
l
4.5 5 6 %
t
UVR
Undervoltage Detect to RST Falling V
CC
Below Threshold by 1% (Note 3) 1 ms
Power-Fail Thresholds (LTC2935-1/LTC2935-2)
ΔV
PFT
Power-Fail Threshold Differential V
PFT(N)
– V
RTF(N)
Any Selected Reset Threshold (V
CC
Falling)
l
100 150 200 mV
V
PFT(HYST)
Power-Fail Threshold Hysteresis Relative to Any Selected Power-Fail Threshold
(V
CC
Rising)
l
2 2.5 3.5 %
t
UVP
Undervoltage Detect to PFO Falling V
CC
Below Threshold by 1% (Note 3) 1 ms
Power-Fail Thresholds (LTC2935-3/LTC2935-4)
ΔV
PFT
Power-Fail Threshold Differential V
PFT(N)
– V
RTF(N)
Any Selected Reset Threshold (V
CC
Falling)
l
70 120 170 mV
V
PFT(HYST)
Power-Fail Threshold Hysteresis Relative to Any Selected Power-Fail Threshold
(V
CC
Rising)
l
2 2.5 3 %
t
UVP
Undervoltage Detect to PFO Falling V
CC
Below Threshold by 1% (Note 3) 1 ms
Control Inputs: MR, S2, S1, S0
V
IN(TH)
Control Input Threshold S2, S1, S0
MR
l
l
0.3 • V
CC
0.4
0.7 • V
CC
1.4
V
V
t
PW
Input Pulse Width MR
l
20 μs
t
PD
Propagation Delay to RST Falling Manual Reset Falling
l
2520 μs
R
PU
Internal Pull-Up Resistance MR
l
600 900 1200 kΩ
I
LK
Input Leakage Current S2, S1, S0 = V
CC
or GND
l
±1 ±10 nA
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
= 3.6V, unless otherwise noted. (Note 2)
P1-P3P4-P6P7-P9P10-P12

LTC2935CTS8-2#TRMPBF

Mfr. #:
Buy LTC2935CTS8-2#TRMPBF
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits Ultra-Low Power Adjustable Supervisor with Power-Fail Output & Selectable Thresholds
Lifecycle:
New from this manufacturer.
Delivery:
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