LTC2934CDC1#PBF Linear Technology, LTC2934CDC1#PBF Datasheet

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LTC2934CDC1#PBF

Manufacturer Part Number
LTC2934CDC1#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LTC2934CDC1#PBF

Voltage Supervisor Type
Voltage Monitor
Number Of Voltage Supervisors
1
Reset Threshold Voltage (min)
AdjV
Reset Threshold Voltage (max)
AdjV
Operating Supply Voltage (min)
1.6V
Operating Supply Voltage (max)
5.5V
Operating Temperature Classification
Commercial
Operating Temp Range
0C to 70C
Pin Count
8
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
V
a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
IN
POWER FAIL FALLING THRESHOLD = 1.686V
RESET FALLING THRESHOLD
500nA Quiescent Current
±1.5% (Max) Accuracy over Temperature
Operates Down to 1.6V Supply
Adjustable Reset Threshold
Adjustable Power-Fail Threshold
Early Warning Power-Fail Output
Selectable 15ms or 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
, LT, LTC, LTM are registered trademarks of Linear Technology Corporation. ThinSOT is
0.1μF
Confi gurable Low Power Voltage Supervisor
750k
11.8k
237k
ADJ
PFI
MR
= 1.606V
RT
LTC2934-2
GND
V
CC
PFO
RST
POWERED
BATTERY
SYSTEM
LOGIC
2934 TA01a
DESCRIPTION
The LTC
system initialization, power-fail warning and reset gen-
eration functions. Low quiescent current (500nA typical)
makes the LTC2934 an ideal choice for battery-operated
applications.
Precision power-fail and reset voltages can be confi gured
independently. Early warning of an impending low volt-
age condition is provided at the power-fail output (PFO)
when the PFI input falls below 0.4V. Supervisory circuits
monitor the ADJ input and pull RST low when ADJ falls
below 0.4V. When ADJ is rising from an under-threshold
condition, an internal reset timer is started after exceeding
the ADJ threshold by 5%. The 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 (LTC2934-1) or active pull-up circuits
(LTC2934-2). Operating temperature range is from –40ºC
to 85ºC.
Adjustable Supervisor with
V
RST, RT = GND
RST, RT = V
CC
®
CC
2934 ultra-low power voltage monitor provides
Selectable Reset Timeout Period
15ms
Power-Fail Output
Ultra-Low Power
200ms
LTC2934
2934 TA01b
1
2934f

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LTC2934CDC1#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 Supervisor V IN 750k V ...

Page 2

LTC2934 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltages V ........................................................... –0. ADJ, PFI ................................................... –0. RT, MR ......................................–0. Output Voltages PFO, RST (LTC2934-1)............................. –0. PFO, RST (LTC2934-2)..............–0. PIN CONFIGURATION ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V V Input Supply Voltage Input Supply Current CC CC Threshold Adjustment Inputs: ADJ, PFI V Input Threshold (Monitored Voltage Falling ADJ ...

Page 4

LTC2934 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 1000 EXTERNALLY CONFIGURED FOR 3V FALLING THRESHOLDS 800 600 400 200 Comparator Undervoltage Glitch Immunity 3.0 2.5 2.0 COMPARATORS PULL DOWN ABOVE CURVE 1.5 1.0 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs RT Input Voltage 250 V = 3.6V CC 200 150 100 0.5 1 1.5 RT INPUT VOLTAGE (V) PIN FUNCTIONS ADJ: Reset Threshold Adjustment Input. Tie to resistive divider between monitored ...

Page 6

LTC2934 BLOCK DIAGRAM 900k V CC ADJ PFI TIMING DIAGRAM V TH+HYST PFI PFO V TH+HYST ADJ t RST RST – RESET DELAY + 0. – GND ...

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 LTC2934 provides power management capabilities for the system power-up phase. The supervisory device ...

Page 8

LTC2934 APPLICATIONS INFORMATION R3 is easily obtained from – R1 – 8.1M – 1.87M – 130k = 6.1M SUM The closest 1% value is 6.04M. Plugging the standard values back into the equations yields the ...

Page 9

APPLICATIONS INFORMATION Manual Reset Input When V is above its reset threshold, and the manual CC reset input (MR) is pulled low, the RST output is forced low. RST remains low for the selected reset timeout period after the manual ...

Page 10

LTC2934 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

... OUT ADJ 1.18M 1μF 100k 590k LOW BATTERY EARLY WARNING 2934 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 2934f ...

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