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LM322 データシート(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM322
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)

LM322 データシート(HTML) 1 Page - National Semiconductor (TI)

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TLH7768
February 1995
LM122LM322LM3905 Precision Timers
General Description
The LM122 series are precision timers that offer great ver-
satility with high accuracy They operate with unregulated
supplies from 45V to 40V while maintaining constant timing
periods from microseconds to hours Internal logic and reg-
ulator circuits complement the basic timing function
enabling the LM122 series to operate in many different ap-
plications with a minimum of external components
The output of the timer is a floating transistor with built in
current limiting It can drive either ground referred or supply
referred loads up to 40V and 50 mA The floating nature of
this output makes it ideal for interfacing lamp or relay driv-
ing and signal conditioning where an open collector or emit-
ter is required A ‘‘logic reverse’’ circuit can be programmed
by the user to make the output transistor either ‘‘on’’ or
‘‘off’’ during the timing period
The trigger input to the LM122 series has a threshold of
16V independent of supply voltage but it is fully protected
against inputs as high as g40Veven when using a 5V
supply The circuitry reacts only to the rising edge of the
trigger signal and is immune to any trigger voltage during
the timing periods
An internal 315V regulator is included in the timer to reject
supply voltage changes and to provide the user with a con-
venient reference for applications other than a basic timer
External loads up to 5 mA can be driven by the regulator An
internal 2V divider between the reference and ground sets
the timing period to 1 RC The timing period can be voltage
controlled by driving this divider with an external source
through the VADJ pin Timing ratios of 501 can be easily
achieved
The comparator used in the LM122 utilizes high gain PNP
input transistors to achieve 300 pA typical input bias current
over a common mode range of 0V to 3V A boost terminal
allows the user to increase comparator operating current for
timing periods less than 1 ms This lets the timer operate
over a 3 ms to multi-hour timing range with excellent repeat-
ability
The LM122 operates over a temperature range of b55 Cto
a
125 C An electrically identical LM322 is specified from
0 Cto a70 C The LM3905 is identical to the LM122 series
except that the boost and VADJ pin options are not avail-
able limiting minimum timing period to 1 ms
Features
Y
Immune to changes in trigger voltage during timing
interval
Y
Timing periods from microseconds to hours
Y
Internal logic reversal
Y
Immune to power supply ripple during the timing
interval
Y
Operates from 45V to 40V supplies
Y
Input protected to g40V
Y
Floating transistor output with internal current limiting
Y
Internal regulated reference
Y
Timing period can be voltage controlled
Y
TTL compatible input and output
Connection Diagrams
Metal Can Package
TLH7768 – 6
Top View
Order Number LM122H
See NS Package Number H10C
Dual-In-Line Package
TLH7768 – 7
Top View
Order Number LM322N
See NS Package Number N14A
Dual-In-Line Package
TLH7768 – 8
Top View
Order Number LM3905N
See NS Package Number N08E
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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