LTC6995-1/LTC6995-2

1

699512f

For more information www.linear.com/6995

Typical applicaTion

FeaTures

DescripTion

TimerBlox: Long Timer, Low

Frequency Oscillator

The LTC®6995 is a silicon oscillator with a programmable

periodrangeof1.024msto9.54hours(29.1µHzto977Hz),

specifically intended for long duration timing events. The

silicon timing devices.

master oscillator frequency. The output clock period

is determined by this master oscillator and an internal

50k

Ω

When oscillating, the LTC6995 generates a 50% duty

cycle square wave output. A reset function is provided

to stop the master oscillator and clear internal dividers.

Removing reset initiates a full output clock cycle which

is useful for programmable power on reset and watchdog

timer applications.

The LTC6995 has two versions of reset functionality. The

reset input is active high for the LTC6995-1 and active low

for the LTC6995-2. The polarity of the output when reset

is selectable for both versions.

OUTPUT (OSCILLATOR START STATE)

RST/RST POLARITY

LTC6995-1

LTC6995-2

0

0

Oscillating (Low)

0 (Reset)

1

0

0 (Reset)

Oscillating (Low)

0

1

Oscillating (High)

1 (Reset)

1

1

1 (Reset)

Oscillating (High)

applicaTions

n

Period Range: 1ms to 9.5 Hours

n

Timing Reset by Power-On or Reset Input

n

Configured with 1 to 3 Resistors

n

<1.5% Maximum Frequency Error

n

Programmable Output Polarity

n

2.25V to 5.5V Single Supply Operation

n

55µA to 80µA Supply Current

(2ms to 9.5hr Clock Period)

n

500µs Start-Up Time

n

CMOS Output Driver Sources/Sinks 20mA

n

–55°C to 125°C Operating Temperature Range

n

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

and 2mm

× 3mm DFN Packages

n

Power-On Reset Timer

n

Long Time One Shot

n

“Heartbeat” Timers

n

Watchdog Timers

n

Periodic “Wake-Up” Call

n

High Vibration, High Acceleration Environments

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.

Active Low Power-On Reset Timer

LTC6995-1

0.1µF

OUT

1M

392k

118k

RST

GND

SET

OUT

DIV

699512 TA01

5 SECONDS

TIMER STOPPED

POWER-ON RESET

(1ms TO 4.8 HOURS)