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SCT1555のメーカーはZetex Semiconductorsです、この部品の機能は「PRECISION SINGLE CELL TIMER」です。 |
部品番号 | SCT1555 |
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部品説明 | PRECISION SINGLE CELL TIMER | ||
メーカ | Zetex Semiconductors | ||
ロゴ | |||
このページの下部にプレビューとSCT1555ダウンロード(pdfファイル)リンクがあります。 Total 10 pages
PRECISION SINGLE CELL TIMER
ZSCT1555
ISSUE 2 - MAY 1998
DEVICE DESCRIPTION
These devices are precision timing circuits for
generation of accurate time delays or
oscillation. Advanced circuit design means that
these devices can operate from a single battery
cell with the minimum of quiescent current.
In monostable mode time delays are
controlled by a single resistor and capacitor
network. In astable mode the frequency and
duty cycle can be accurately and
independently controlled with two external
resistors and one capacitor.
The threshold and trigger levels are normally
set as a proportion of VCC by internal resistors.
These levels can be programmed by the use
of the control input pin.
When the trigger input reduces to a value
below the trigger level, the flip-flop is set and
the output goes high. With the trigger input
above the trigger level and the threshold input
above the threshold level, the flip-flop is reset
SCHEMATIC DIAGRAM
8
VCC
and the output goes low. The reset pin has
priority over all the other inputs and is used
to start new timing cycles. A low on the reset
input causes the flip-flop to reset forcing the
output low. Whenever the output is forced
low then the internal discharge transistor is
turned on.
FEATURES
• 0.9V supply operating voltage guaranteed
• Pin connections comparable with 555
series timers
• Very low quiescent current 74 µA
• SO8 and DIL8 packages
• Operating temperature range
compatible with battery technologies
APPLICATIONS
• Portable and battery powered
equipment
• Low voltage and low power systems
CONTROL
5
6
THRESH
2
TRIGGER
7
DISCHARGE
4
RESET
4-311
3
OUTPUT
1
GND
1 Page ZSCT1555
ELECTRICAL CHARACTERISTICS (Continued)
TEST CONDITIONS (Unless otherwise stated):Tamb=25°C,VCC=1.5V
SYMBOL PARAMETER
CONDITIONS
LIMITS
UNITS
MIN. TYP. MAX.
tR
tF
∆tIA(m)
∆tV(m)
∆tT(m)
∆tIA(a)
∆tV(a)
∆tT(a)
fA
Output pulse rise time
Output pulse fall time
Timing error, Monostable
Initial accuracy (Note 2)
Drift with supply voltage
Drift with temperature
Timing error, Astable
Initial accuracy (Note 2)
Drift with supply voltage
Drift with temperature
Astable maximum frequency
CL= 10pF
VCC=5V, CL=10pF
CL= 10pF
VCC=5V, CL=10pF
RA= 10 to 50 kΩ
RB= 10 to 50 kΩ
CT = 68nF
RA= 10 to 50 kΩ
RB= 10 to 50 kΩ
CT = 68nF
RA=20 kΩ
RB= 10 kΩ
CT =47pF
1.6 µs
1.2
240 ns
24
1.6
0.262
100
%
%/V
ppm/°C
4.8
0.662
150
330
%
%/V
ppm/°C
kHz
Note 1: This will influence the maximum values of RA and RB (RAMAX=10MΩ,RBMAX=1.5MΩ)
Note 2: Is defined as the difference between the measured value and the average value of a
random sample taken on a batch basis
4-313
3Pages ZSCT1555
FUNCTIONAL DIAGRAM
FUNCTIONAL TABLE
RESET
Low
High
High
High
TRIGGER VALUE THRESHOLD
VOLTAGE
N/A N/A
<VCC/5
>VCC/5
>VCC/5
N/A
>4VCC/5
<4VCC/5
OUTPUT
DISCHARGE
SWITCH
Low
On
High
Off
Low
On
As Previously established
POWER DERATING TABLE
Package TA≤25°C
Derating Factor
Power Rating Above TA=25°C
N8 625mW
6.25mW/°C
D8 625mW
6.25mW/°C
TA=70°C Power
Rating
330mW
330mW
TA=85°C Power
Rating
250mW
250mW
4-316
6 Page | |||
ページ | 合計 : 10 ページ | ||
|
PDF ダウンロード | [ SCT1555 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
SCT1555 | PRECISION SINGLE CELL TIMER | Zetex Semiconductors |