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參數(shù)資料
| 型號(hào)： | LM2240N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Programmable Timer/Counter |
| 中文描述： | 1 TIMER(S), PROGRAMMABLE TIMER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 1/10頁(yè) |
| 文件大小： | 201K |
| 代理商： | LM2240N |
TL/H/10837
L
August 1990
LM2240
Programmable Timer/Counter
General Description
The LM2240 Programmable Timer/Counter is a monolithic
controller capable of both monostable and astable opera-
tion. Monostable operation allows accurate microsecond to
five day time delays. Long delays, up to three years, can
easily be generated by cascading two timers. The timer con-
sists of a time-base oscillator, programmable 8-bit counter
and control flip-flop. An external resistor-capacitor (RC) net-
work sets the oscillator frequency and allows delay times
from 1 RC to 255 RC to be selected. In the astable mode of
operation, a single RC network sets the base frequency.
The frequencies of the squarewaves at the 8 outputs are
each at different factors of 2 from the base frequency. If 2 or
more of the outputs are shorted together, various pulse pat-
terns can be generated. These frequencies or pulse pat-
terns can also easily be synchronized to an external signal.
The trigger, reset and outputs are all TTL and CMOS com-
patible for easy interface with digital systems. The timer’s
high accuracy and versatility in producing a wide range of
time delays makes it ideal as a direct replacement for me-
chanical or electromechanical devices.
Features
Y
Accurate timing from microseconds to days
Y
Programmable delays from 1 RC to 255 RC
Y
TTL and CMOS compatible outputs
Y
Timing directly proportional to RC time constant
Y
High accuracy
Y
External sync and modulation capability
Y
Wide supply voltage range
Y
Excellent supply voltage rejection
Connection Diagram
16-Lead Molded DIP
TL/H/10837–1
Top View
See NS Package Number N16E
Order Number LM2240N
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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