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參數(shù)資料
| 型號： | ELM381 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 60 Hz Long Interval Counter |
| 中文描述： | 60赫茲的時間間隔計數(shù)器 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 30K |
| 代理商： | ELM381 |
ELM381
< http://www.elmelectronics.com/ >Connection Diagram
PDIP and SOIC
(top view)
V
DD
V
SS
1
2
3
4
8
7
6
5
The ELM381 is a digitally configurable, multi-
stage counter circuit in a single 8 pin package. When
connected to a 60Hz source, four time periods from
one hour to one week are possible, as shown in
Table 1 below.
Although the circuit has been optimized for a
60Hz input frequency, it is capable of being operated
over a very wide range of frequencies. Of particular
interest is the ability to interface directly to very low
frequencies with varying waveforms due to the use
of a Schmitt trigger input circuit.
The ELM381 provides two outputs – a standard
50% duty cycle divider output, and a momentarily
pulsed output. The pulse output is useful for audibly
or visually signalling the beginning of a time period,
or as a trigger for other circuitry. Refer to the
Example Applications section for two typical circuits.
Out
Description
Long term (daily or weekly) event timers
Missing event detectors
Automatic shutoff circuits
Applications
Block Diagram
1 of 4
Low power CMOS design - typically 1mA at 5V
Wide supply range – 3.0 to 5.5 volt operation
Digitally selectable delays
Schmitt trigger circuitry on the clock input
Completely static operation
Long term accuracy with line frequency clock
High current drive outputs – up to 25 mA
Reset input provided with a pullup resistor
Features
ELM381DSA
Clock
reset
60 Hz Long Interval Counter
Pulse
D1
D0
5
Clock
7
Out
4
6
Digital
Counters
2
V
DD
reset
D1
Pulse
Generator
Pulse
D0
3
V
DD
V
SS
Table 1
(60Hz)
7 days
12 hrs
1 hour
24 hrs
D1
L
H
H
L
D0
H
H
L
L
Setting
Divisor
x 1000
2592
216
36,288
5184
Period
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