LTC6993-1 Datasheet, PDF (1/24 Pages) Linear Technology – TimerBlox: Monostable

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 _{–40°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 and the Linear logo are registered trademarks and
TimerBlox and ThinSOT are trademarks 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.
The LTC6993 is available in the 6-lead SOT-23 (ThinSOT)
and 6-lead 2mm × 3mm DFN packages.
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
69931234f
1