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LM122 データシート(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM122
部品情報  Precision Timers
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM122 データシート(HTML) 7 Page - National Semiconductor (TI)

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Pin Function Description (Continued)
for instance cannot be held for more than 4 seconds
These levels are based on 40 C maximum initial chip tem-
perature When driving inductive loads always use a clamp
diode to protect the transistor from inductive kick-back
A boost pin is provided on the LM122 to increase the speed
of the internal comparator The comparator is normally op-
erated at low current levels for lowest possible input current
For timing periods less than 1 ms where low input current is
not needed comparator operating current can be increased
several orders of magnitude Shorting the boost terminal to
V
a
increases the emitter current of the vertical PNP drivers
in the differential stage from 25 nA to 5 mA This pin is not
available on the LM3905
With the timer in the unboosted state timing periods are
accurate down to about 1 ms In the boosted mode loss of
accuracy due to comparator speed is only about 800 ns so
timing periods of several microseconds can be used The
800 ns error is relatively insensitive to temperature so tem-
perature coefficient of pulse width is still good
The Logic pin is used to reverse the signal appearing at the
output transistor An open or ‘‘high’’ condition on the logic
pin programs the output transistor to be ‘‘off’’ during the
timing period and ‘‘on’’ all other times Grounding the logic
pin reverses the sequence to make the transistor ‘‘on’’ dur-
ing the timing period Threshold for the logic pin is typically
100 mV with 150 mA flowing out of the terminal If an active
drive to the logic pin is desired a saturated transistor drive
is recommended either with a discrete transistor or the
open collector output of integrated logic A maximum VSAT
of 25 mV at 200 mA is required Minimum and maximum
voltages that may appear on the logic pin are 0 and a50
respectively
Typical Applications
Basic Timers
Figure 1 is a basic timer using the collector output Rt and Ct
set the time interval with RL as the load During the timing
interval the output may be either high or low depending on
the connection of the logic pin Timing waveforms are
shown in the sketch along side
Figure 1 Note that the trig-
ger pulse may be either shorter or longer than the output
pulse width
Figure 2 is again a basic timer but with the output taken
from the emitter of the output transistor As with the collec-
tor output either a high or low condition may be obtained
during the timing period
Simulating a Thermal Delay Relay
Figure 3 is an application where the LM122 is used to simu-
late a thermal delay relay which prevents power from being
applied to other circuitry until the supply has been on for
some time The relay remains de-energized for Rt Ct sec-
onds after VCC is applied then closes and stays energized
until VCC is turned off Figure 4 is a similar circuit except that
the relay is energized as soon as VCC is applied Rt Ct sec-
onds later the relay is de-energized and stays off until the
VCC supply is recycled
TLH7768 – 11
FIGURE 1 Basic Timer-Collector
Output and Timing Chart
TLH7768 – 12
FIGURE 2 Basic Timer-Emitter Output and Timing Chart
TLH7768 – 13
FIGURE 3 Time Out on Power Up
(Relay Energized Rt Ct Seconds after VCC is Applied)
a
5V Supply Driving 28V Relay
Figure 5 shows the timer interfacing 5V logic to a high volt-
age relay Although the Va terminal could be tied to the
a
28V supply this may be an unnecessary waste of power
in the IC or require extra wiring if the LM122 is on a logic
card In either case the threshold for the trigger is 16V
7


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