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LTC6991HS6#PBF

Description
LTC6991 - TimerBlox: Resettable, Low Frequency Oscillator; Package: SOT; Pins: 6; Temperature Range: -40°C to 125°C
CategoryPassive components    oscillator   
File Size273KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC6991HS6#PBF Overview

LTC6991 - TimerBlox: Resettable, Low Frequency Oscillator; Package: SOT; Pins: 6; Temperature Range: -40°C to 125°C

LTC6991HS6#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
Parts packaging codeSOT
Contacts6
Manufacturer packaging codeS6
Reach Compliance Codecompliant
ECCN codeEAR99
Is SamacsysN
Other featuresOUTPUT FREQUENCY 29.1 MICRO HZ TO 977 HZ
maximum descent time2.4 ns
Frequency Adjustment - MechanicalNO
JESD-609 codee3
Installation featuresSURFACE MOUNT
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Oscillator typeCMOS
Output load5 pF
physical size2.9mm x 1.5mm x 1.0mm
longest rise time2.7 ns
Maximum supply voltage5.5 V
Minimum supply voltage2.25 V
surface mountYES
Terminal surfaceMatte Tin (Sn)
Base Number Matches1
FEATURES
n
n
n
n
n
n
n
n
n
n
LTC6991
TimerBlox: Resettable, Low
Frequency Oscillator
DESCRIPTION
The LTC
®
6991 is a silicon oscillator with a programmable
period range of 1.024ms to 9.54 hours (29.1μHz to 977Hz),
specifically intended for long duration timing events. The
LTC6991 is part of the TimerBlox
®
family of versatile silicon
timing devices.
A single resistor, R
SET
, programs the LTC6991’s internal
master oscillator frequency. The output clock period
is determined by this master oscillator and an internal
frequency divider, N
DIV
, programmable to eight settings
from 1 to 2
21
.
t
OUT
=
N
DIV
• R
SET
• 1.024ms, N
DIV
=
1,8,64,...,2
21
50kΩ
Period Range: 1ms to 9.5 Hours
Configured with 1 to 3 Resistors
<1.5% Maximum Frequency Error
Output Reset Function
2.25V to 5.5V Single Supply Operation
55μA to 80μA Supply Current
(2ms to 9.5hr Clock Period)
500μs Start-Up Time
CMOS Output Driver Sources/Sinks 20mA
–55°C to 125°C Operating Temperature Range
Available in Low Profile (1mm) SOT-23 (ThinSOT
)
and 2mm
×
3mm DFN Packages
APPLICATIONS
n
n
n
n
n
n
“Heartbeat” Timers
Watchdog Timers
Intervalometers
Periodic “Wake-Up” Call
High Vibration, High Acceleration Environments
Portable and Battery-Powered Equipment
In normal operation, the LTC6991 oscillates with a 50%
duty cycle. A reset function is provided to truncate the
pulse (reducing the duty cycle). The reset pin can also be
used to prevent the output from oscillating.
The RST and OUT pins can be configured for active-low
or active-high operation using a polarity function.
POL BIT
0
0
1
1
RST PIN
0
1
0
1
OUTPUT STATE
Oscillating
0 (reset)
1 (reset)
Oscillating
L,
LT, LTC, LTM, Linear Technology, TimerBlox and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
For easy configuration of the LTC6991, download the
TimerBlox Designer tool at
www.linear.com/timerblox.
TYPICAL APPLICATION
Low Frequency Pulse Generator
OUT
R
PW
2.26k
RST
C
PW
470pF
R
SET
715k
SET
DIV
R2
392k
t
PULSE
≈ R
PW
PW
≈ 1μs
Clock Period Range over Eight Divider Settings
10Hr
1Hr
CLOCK PERIOD (LOG SCALE)
1μs PULSE WIDTH
60 SECONDS
10Min
1Min
10Sec
1Sec
100ms
10ms
1ms
0
1.25
0.625
1.875
DIV PIN VOLTAGE, V
DIV
(V)
2.5
6991 TA01b
OUT
6991 TA01a
LTC6991
GND
V
+
R1
1M
5V
0.1μF
6991fb
1
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