LTC6991HS6 データシートの表示（PDF） - Analog Devices

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LTC6991HS6

TimerBlox: Resettable, Low Frequency Oscillator

Analog Devices 

FEATURES

nn Period Range: 1ms to 9.5 Hours

nn Configured with 1 to 3 Resistors

nn <1.5% Maximum Frequency Error

nn Output Reset Function

nn 2.25V to 5.5V Single Supply Operation

nn 55µA to 80µA Supply Current

nn (2ms to 9.5hr Clock Period)

nn 500µs Start-Up Time

nn CMOS Output Driver Sources/Sinks 20mA

nn –55°C to 125°C Operating Temperature Range

nn Available in Low Profile (1mm) SOT-23 (ThinSOT™)

and 2mm × 3mm DFN Packages

APPLICATIONS

nn “Heartbeat” Timers

nn Watchdog Timers

nn Intervalometers

nn Periodic “Wake-Up” Call

nn High Vibration, High Acceleration Environments

nn Portable and Battery-Powered Equipment

All registered trademarks and trademarks are the property of their respective owners.

LTC6991

TimerBlox: Resettable, Low

Frequency Oscillator

DESCRIPTION

The LTC®6991 is a silicon oscillator with a program-

mable 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, RSET , programs the LTC6991’s inter-

nal master oscillator frequency. The output clock period

is determined by this master oscillator and an internal

frequency divider, NDIV , programmable to eight settings

from 1 to 221.

tOUT

=

NDIV • RSET

50kΩ

• 1.024ms,

NDIV

= 1,8,64,...,221

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

For easy configuration of the LTC6991, download the

TimerBlox Designer tool at www.linear.com/timerblox.

TYPICAL APPLICATION

Low Frequency Pulse Generator

RPW

2.26k

CPW

470pF

RST

OUT

LTC6991

GND

V+

RSET

715k

SET

DIV

tPULSE ≈ RPW • CPW ≈ 1µs

1µs PULSE WIDTH

OUT

60 SECONDS

5V

R1

0.1µF

1M

R2

392k

6991 TA01a

Clock Period Range over Eight Divider Settings

10Hr

1Hr

10Min

1Min

10Sec

1Sec

100ms

10ms

1ms

0

0.625

1.25

1.875

2.5

DIV PIN VOLTAGE, VDIV (V) 6991 TA01b

For more information www.linear.com/LTC6991

6991fc

1

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