LTC6994-2_15 Datasheet, PDF (1/26 Pages) Linear Technology – Delay Block/ Debouncer

Features
n _{Delay Range: 1µs to 33.6 Seconds}
n _{Configured with 1 to 3 Resistors}
n _{Delay Max Error:}
– <2.3% for Delay > 512µs
– <3.4% for Delay of 8µs to 512µs
– <5.1% for Delay of 1µs to 8µs
n _{Delay One or Both Rising/Falling Edges}
n _{2.25V to 5.5V Single Supply Operation}
n _{70µA Supply Current at 10µs Delay}
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
Applications
n _{Noise Discriminators/Pulse Qualifiers}
n _{Delay Matching}
n _{Switch Debouncing}
n _{High Vibration, High Acceleration Environments}
n _{Portable and Battery-Powered Equipment}
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.
LTC6994-1/LTC6994-2
TimerBlox: Delay Block/
Debouncer
Description
The LTC^®6994 is a programmable delay block with a
range of 1µs to 33.6 seconds. The LTC6994 is part of
the TimerBlox^® family of versatile silicon timing devices.
A single resistor, R_SET , programs an internal master os-
cillator frequency, setting the LTC6994’s time base. The
input-to-output delay is determined by this master oscil-
lator and an internal clock divider, N_DIV , programmable
to eight settings from 1 to 2²¹:
t_DELAY
=
N_DIV • R_SET
50kΩ
• 1µs, N_DIV
= 1, 8, 64,...,2²¹
The output (OUT) follows the input (IN) after delaying
the rising and/or falling transitions. The LTC6994-1 will
delay the rising or falling edge. The LTC6994-2 will delay
both transitions, and adds the option to invert the output.
DEVICE
DELAY FUNCTION
LTC6994-1
or
LTC6994-2
or
The LTC6994 also offers the ability to dynamically adjust
the delay time via a separate control voltage.
For easy configuration of the LTC6994, download the
TimerBlox Designer tool at www.linear.com/timerblox.
Typical Application
Noise Discriminator
NOISY
INPUT
IN
OUT
LTC6994-2
GND
V⁺
QUALIFIED
OUTPUT
3.3V
0.1µF
SET
R_SET
75k
DIV
699412 TA01a
IN
2V/DIV
OUT
2V/DIV
1.5µs
1.5µs
20µs/DIV
699412 TA01b
699412fb
1