LTC6993-4_15 Datasheet, PDF (1/26 Pages) Linear Technology – Monostable Pulse Generator

LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
TimerBlox: Monostable
Pulse Generator (One Shot)
FEATURES
DESCRIPTION
n _{Pulse Width Range: 1µs to 33.6 Seconds}
n _{Configured with 1 to 3 Resistors}
n _{Pulse Width Max Error:}
– <2.3% for Pulse Width > 512µs
– <3.4% for Pulse Width of 8µs to 512µs
– <4.9% for Pulse Width of 1µs to 8µs
n _{Four LTC6993 Options Available:}
– Rising-Edge or Falling-Edge Trigger
– Retriggerable or Non-Retriggerable
n _{Configurable for Positive or Negative Output Pulse}
n _{Fast Recovery Time}
n _{2.25V to 5.5V Single Supply Operation}
n _{70µA Supply Current at 10µs Pulse Width}
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 _{Watchdog Timer}
n _{Frequency Discriminators}
n _{Missing Pulse Detection}
n _{Envelope Detection}
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.
The LTC^®6993 is a monostable multivibrator (also known
as a “one-shot” pulse generator) with a programmable
pulse width of 1µs to 33.6 seconds. The LTC6993 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 LTC6993’s time base. The
output pulse width is determined by this master oscillator
and an internal clock divider, N_DIV , programmable to eight
settings from 1 to 2²¹.
t_OUT
= ^{NDIV •RSET}
50kΩ
•1µs, N_DIV
= 1, 8, 64,...,2²¹
The output pulse is initiated by a transition on the trigger
input (TRIG). Each part can be configured to generate posi-
tive or negative output pulses. The LTC6993 is available
in four versions to provide different trigger signal polarity
and retrigger capability.
DEVICE
LTC6993-1
LTC6993-2
LTC6993-3
LTC6993-4
INPUT POLARITY
Rising-Edge
Rising-Edge
Falling-Edge
Falling-Edge
RETRIGGER
No
Yes
No
Yes
The LTC6993 also offers the ability to dynamically adjust
the width of the output pulse via a separate control voltage.
For easy configuration of the LTC6993, download the
TimerBlox Designer tool at www.linear.com/timerblox.
TYPICAL APPLICATION
Envelope Detector
MODULATED
CARRIER
TRIG OUT
LTC6993-2
GND
V⁺
SIGNAL
ENVELOPE
3.3V
0.1µF
R_SET
800k
SET
DIV
69931234 TA01a
TRIG
2V/DIV
OUT
2V/DIV
80kHz CARRIER
16µs
50µs/DIV
69931234 TA01b
69931234fb
1