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MC1455B Datenblatt(PDF) 1 Page - ON Semiconductor

Teilenummer MC1455B
Bauteilbeschribung  Timers
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Direct Link  http://www.onsemi.com
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© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 9
1
Publication Order Number:
MC1455/D
MC1455, MC1455B,
NCV1455B
Timers
The MC1455 monolithic timing circuit is a highly stable controller
capable of producing accurate time delays or oscillation. Additional
terminals are provided for triggering or resetting if desired. In the time
delay mode, time is precisely controlled by one external resistor and
capacitor. For astable operation as an oscillator, the free−running
frequency and the duty cycle are both accurately controlled with two
external resistors and one capacitor. The circuit may be triggered and
reset on falling waveforms, and the output structure can source or sink
up to 200 mA or drive MTTL circuits.
Features
Direct Replacement for NE555 Timers
Timing from Microseconds through Hours
Operates in Both Astable and Monostable Modes
Adjustable Duty Cycle
High Current Output Can Source or Sink 200 mA
Output Can Drive MTTL
Temperature Stability of 0.005% per °C
Normally ON or Normally OFF Output
Pb−Free Packages are Available
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
ORDERING INFORMATION
x
= B or V
yyy
= BP1 or P1
A
= Assembly Location
L
= Wafer Lot
Y, YY
= Year
W, WW = Work Week
G or G = Pb−Free Package
SOIC−8
D SUFFIX
CASE 751
1
8
MARKING
DIAGRAMS
PDIP−8
P1 SUFFIX
CASE 626
1
8
1
8
MC1455yyy
AWL
YYWWG
1455x
ALYW
G
1
8
Figure 1. 22 Second Solid State Time Delay Relay Circuit
Figure 2. Representative Block Diagram
Figure 3. General Test Circuit
1.0 k
Load
MT2
10 k
0.1
mF
0.01
mF
1
5
2
4
38
6
7
1.0
mF
C
20M
G
MT1
−10 V
1N4003
1N4740
3.5 k
250 V
+
t = 1.1; R and C = 22 sec
Time delay (t) is variable by
changing R and C (see Figure 16).
10
mF
VCC
Threshold
Control Voltage
Trigger
6
5
2
5 k
8
5 k
5 k
+
Comp
A
+
Comp
B
1
GND
Reset
4
R
S
Flip
Flop
Q
Inhibit/
Reset
7
3
Discharge
Output
R
MC1455
VR
Reset
4
8
ICC
VCC
700
Discharge
6
Threshold
7
Ith
2.0 k
VS
Trigger
2
GND
1
3
ISink
ISource
VO
0.01
mF
+
5
Control
Voltage
Output
VCC
MC1455
Test circuit for measuring DC parameters (to set output and measure
parameters):
a) When VS w 2/3 VCC, VO is low.
b) When VS v 1/3 VCC, VO is high.
c) When VO is low, Pin 7 sinks current. To test for Reset, set VO
c) high, apply Reset voltage, and test for current flowing into Pin 7.
c) When Reset is not in use, it should be tied to VCC.


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