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CA555, CA555C, LM555C
December 1999
File Number 834.6
Timers for Timing Delays and Oscillator
Applications in Commercial, Industrial
and Military Equipment
[ /Title
The CA555 and CA555C are highly stable timers for use in
(CA55
precision timing and oscillator applications. As timers, these
5,
monolithic integrated circuits are capable of producing
CA555
accurate time delays for periods ranging from microseconds
through hours. These devices are also useful for astable
C,
LM555
oscillator operation and can maintain an accurately
controlled free running frequency and duty cycle with only
C)
two external resistors and one capacitor.
/Sub-
The circuits of the CA555 and CA555C may be triggered by
ject
the falling edge of the waveform signal, and the output of
(Tim-
these circuits can source or sink up to a 200mA current or
ers for
drive TTL circuits.
Timing
These types are direct replacements for industry types in
Delays
packages with similar terminal arrangements e.g. SE555
and
and NE555, MC1555 and MC1455, respectively. The CA555
Oscilla-
type circuits are intended for applications requiring premium
electrical performance. The CA555C type circuits are
tor
Appli-
intended for applications requiring less stringent electrical
cations
characteristics.
in
Part Number Information
Com-
PART NUMBER
TEMP.
PKG.
mer-
o
C)
(BRAND)
RANGE (
PACKAGE
NO.
cial,
CA0555E
-55 to 125 8 Ld PDIP
E8.3
Indus-
CA0555CE
0 to 70
8 Ld PDIP
E8.3
trial
LM555CN
0 to 70
8 Ld PDIP
E8.3
and
Mili-
Pinout
tary
CA555, CA555C, LM555C, (PDIP)
Equip-
TOP VIEW
ment)
8 V+
GND 1
/Author
7 DISCHARGE
TRIGGER 2
()
OUTPUT 3
6 THRESHOLD
/Key-
5 CONTROL
RESET 4
words
VOLTAGE
(Harris
Semi-
con-
ductor,
single,
timer,
Features
鈥?Accurate Timing From Microseconds Through Hours
鈥?Astable and Monostable Operation
鈥?Adjustable Duty Cycle
鈥?Output Capable of Sourcing or Sinking up to 200mA
鈥?Output Capable of Driving TTL Devices
鈥?Normally ON and OFF Outputs
鈥?High Temperature Stability . . . . . . . . . . . . . . . . 0.005%/
o
C
鈥?Directly Interchangeable with SE555, NE555, MC1555,
and MC1455
Applications
鈥?Precision Timing
鈥?Sequential Timing
鈥?Time Delay Generation
鈥?Pulse Generation
鈥?Pulse Detector
鈥?Pulse Width and Position Modulation
Functional Block Diagram
V+
TRIGGER
CONTROL
8 VOLTAGE 5 2
THRESHOLD
TRIGGER
COMPAR
6
OUTPUT
THRESHOLD
COMPAR
FLIP-FLOP
3
7
RESET
4
1
GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Copyright
漏
Harris Corporation 1999
DISCHARGE OUTPUT
INTERSIL
1
2
3
4
5
6
