LTC2935IDC-1#PBF Linear Technology, LTC2935IDC-1#PBF Datasheet

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LTC2935IDC-1#PBF

Manufacturer Part Number
LTC2935IDC-1#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LTC2935IDC-1#PBF

Voltage Supervisor Type
Voltage Monitor
Number Of Voltage Supervisors
1
Operating Supply Voltage (max)
5.5V
Operating Temperature Classification
Industrial
Operating Temp Range
-40C to 85C
Pin Count
8
Mounting
Surface Mount
Lead Free Status / Rohs Status
Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC2935IDC-1#PBFLTC2935IDC-1
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC2935IDC-1#PBFLTC2935IDC-1#TRMPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
V
500nA Quiescent Current
±1.5% (Max) Accuracy over Temperature
Integrated Precision Attenuators
Eight Pin-Selectable Reset Thresholds
Eight Pin-Selectable Power-Fail Thresholds
Early Warning Power-Fail Output
200ms Reset Timeout
Manual Reset Input
Compact 8-Lead, 2mm × 2mm DFN and
TSOT-23 (ThinSOT™) Packages
Portable Equipment
Battery-Powered Equipment
Security Systems
Point-of-Sale Devices
Wireless Systems
IN
, LT, LTC, LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
Confi gurable Low Power Voltage Monitor
0.1μF
S2
S1
S0
MR
LTC2935-2
GND
V
CC
RST
PFO
POWERED
BATTERY
SYSTEM
LOGIC
2935 TA01a
Ultra-Low Power Supervisor
DESCRIPTION
The LTC
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, available from 3.3V to 2.25V
in 150mV increments. Early warning of an impending
low voltage condition is provided at the power-fail output
(PFO), whose threshold is 150mV above the confi gured
reset threshold. Supervisory circuits monitor V
pull RST low when V
threshold. When V
condition, an internal reset timer is started after exceed-
ing the reset threshold by 5%. A 200ms reset timeout
delays the return of the RST output to a high state. A
pushbutton 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) or active pull-up
(LTC2935-2) circuits. Operating temperature range is from
–40ºC to 85ºC.
THRESHOLD
RESET
3.30
3.15
3.00
2.85
2.70
2.55
2.40
2.25
(V)
with Power-Fail Output,
®
2935 ultra-low power voltage monitor provides
Selectable Thresholds
POWER-FAIL
THRESHOLD
Falling Threshold Selection Table
3.45
3.30
3.15
3.00
2.85
2.70
2.55
2.40
(V)
CC
CC
is rising from an under-threshold
drops below the confi gured reset
High
High
High
High
Low
Low
Low
Low
S2
High
High
High
High
Low
Low
Low
Low
S1
LTC2935
High
High
High
High
CC
Low
Low
Low
Low
S0
1
and
2935f

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LTC2935IDC-1#PBF Summary of contents

Page 1

... Battery-Powered Equipment n Security Systems n Point-of-Sale Devices n Wireless Systems , LT, LTC, LTM 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. TYPICAL APPLICATION Confi gurable Low Power Voltage Monitor 0.1μF ...

Page 2

... LTC2935IDC-1#TRPBF LTC2935CDC-2#TRMPBF LTC2935CDC-2#TRPBF LTC2935IDC-2#TRMPBF LTC2935IDC-2#TRPBF TRM = 500 pieces. *Temperature grades are identifi 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: For more information on tape and reel specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V V Input Supply Voltage Input Supply Current CC CC Reset Thresholds V Reset Threshold 1 (V Falling) RTF1 CC V Reset Threshold 2 ...

Page 4

LTC2935 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 1000 GND 800 600 400 200 Comparator Undervoltage Glitch Immunity 3.0 2.5 2.0 COMPARATORS PULL DOWN ABOVE CURVE 1.5 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs S0, S1, S2 Input Voltage 250 V = 3.6V CC 200 150 100 0.5 1 1.5 S0, S1, S2 INPUT VOLTAGE (V) PIN FUNCTIONS Exposed Pad (DFN Only): Exposed Pad may ...

Page 6

LTC2935 BLOCK DIAGRAM 900k TIMING DIAGRAM V PFT V RTF V CC PFO t RST RST – RESET DELAY + 0. – GND t RST t PD LTC2935-2 V ...

Page 7

APPLICATIONS INFORMATION VOLTAGE MONITORING Unmanaged power can cause various system problems. At power-up, voltage fl uctuation around critical thresholds can cause improper system or processor initialization. The LTC2935 provides power management capabilities for the system power-up phase. The supervisory device ...

Page 8

LTC2935 APPLICATIONS INFORMATION Selecting Output Logic Style The LTC2935 status outputs are available in two options: open-drain (LTC2935-1) or active pull-up (LTC2935-2). The open-drain option (LTC2935-1) allows the outputs to be pulled user defi ned voltage with ...

Page 9

TYPICAL APPLICATIONS + Li-Ion 0.1μF MANUAL PB1 RESET PUSHBUTTON *OPTIONAL RESISTOR FOR ADDED ESD PROTECTION + 1.5V + 1.5V + 1.5V + CR2032 Battery Monitor with Interface to Low Voltage Logic 3μA LDO IN OUT LT3009 SHDN GND ADJ 1.18M ...

Page 10

LTC2935 PACKAGE DESCRIPTION 2.55 ±0.05 0.64 ±0.05 1.15 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 BAR TOP MARK (SEE NOTE 6) 0.200 REF 10 DC Package 8-Lead ...

Page 11

... JEDEC PACKAGE REFERENCE IS MO-193 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. TS8 Package ...

Page 12

... TSOT-23 Packages, Adjustable via External Resistors www.linear.com ● 1.8V 1.18M 1μF 100k 590k LOW BATTERY EARLY WARNING 2935 TA05 Pin, Adjustable Threshold and Reset, CC Pin, Eight Inputs Two Negative Monitors CC Pin, Adjustable Reset Timer CC LT 0508 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2008 2935f ...

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