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SCT1555 の電気的特性と機能

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。


製品の詳細 ( Datasheet PDF )

部品番号 SCT1555
部品説明 PRECISION SINGLE CELL TIMER
メーカ Zetex Semiconductors
ロゴ Zetex Semiconductors ロゴ 




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SCT1555 Datasheet, SCT1555 PDF,ピン配置, 機能
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





SCT1555 pdf, ピン配列
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 k
RB= 10 to 50 k
CT = 68nF
RA= 10 to 50 k
RB= 10 to 50 k
CT = 68nF
RA=20 k
RB= 10 k
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=10M,RBMAX=1.5M)
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


SCT1555 電子部品, 半導体
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 TA25°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



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共有リンク

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部品番号部品説明メーカ
SCT1555

PRECISION SINGLE CELL TIMER

Zetex Semiconductors
Zetex Semiconductors


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