S E M I C O N D U C T O R
CA555, CA555C,
LM555, LM555C, NE555
Timers for Timing Delays and Oscillator Application
in Commercial, Industrial and Military Equipment
Description
The CA555 and CA555C are highly stable timers for use in
precision timing and oscillator applications. As timers, these
monolithic integrated circuits are capable of producing accu-
rate time delays for periods ranging from microseconds
through hours. These devices are also useful for astable
oscillator operation and can maintain an accurately con-
trolled free running frequency and duty cycle with only two
external resistors and one capacitor.
The circuits of the CA555 and CA555C may be triggered by
the falling edge of the waveform signal, and the output of
these circuits can source or sink up to a 200mA current or
drive TTL circuits.
These types are direct replacements for industry types in
packages with similar terminal arrangements e.g. SE555
and NE555, MC1555 and MC1455, respectively. The CA555
type circuits are intended for applications requiring premium
electrical performance. The CA555C type circuits are
intended for applications requiring less stringent electrical
characteristics.
May 1997
Features
•
•
•
•
•
•
•
•
Accurate Timing From Microseconds Through Hours
Astable and Monostable Operation
Adjustable Duty Cycle
Output Capable of Sourcing or Sinking up to 200mA
Output Capable of Driving TTL Devices
Normally ON and OFF Outputs
High Temperature Stability . . . . . . . . . . . . . . 0.005%/
o
C
Directly Interchangeable with SE555, NE555, MC1555,
and MC1455
• Pulse Generation
• Pulse Detector
• Pulse Width and Position
Modulation
PKG.
NO.
E8.3
M8.15
M8.15
T8.C
E8.3
M8.15
M8.15
T8.C
E8.3
E8.3
E8.3
Applications
• Precision Timing
• Sequential Timing
• Time Delay Generation
Ordering Information
PART NUMBER
TEMP.
(BRAND)
RANGE (
o
C)
CA0555E
-55 to 125
CA0555M (555)
-55 to 125
CA0555M96 (555)
-55 to 125
CA0555T
-55 to 125
CA0555CE
0 to 70
CA0555CM (555C)
0 to 70
CA0555CM96 (555C)
0 to 70
CA0555CT
0 to 70
LM555N
-55 to 125
LM555CN
0 to 70
NE555N
0 to 70
NOTE:
†
Denotes Tape and Reel
PACKAGE
8 Ld PDIP
8 Ld SOIC
8 Ld SOIC
†
8 Pin Metal Can
8 Ld PDIP
8 Ld SOIC
8 Ld SOIC
†
8 Pin Metal Can
8 Ld PDIP
8 Ld PDIP
8 Ld PDIP
Pinouts
CA555, CA555C (PDIP, SOIC)
LM555, LM555C, NE555 (PDIP)
TOP VIEW
GND 1
TRIGGER 2
OUTPUT 3
RESET 4
8 V+
7 DISCHARGE
6 THRESHOLD
5 CONTROL
VOLTAGE
Functional Block Diagram
V+
8
TRIGGER
CONTROL
5 2
VOLTAGE
THRESHOLD
3
OUTPUT
6
THRESHOLD
COMPAR
7
CA555, CA555C (METAL CAN)
TOP VIEW
V+
8
GND 1
TRIGGER 2
OUTPUT 3
4
RESET
5
7 DISCHARGE
6 THRESHOLD
CONTROL
VOLTAGE
TAB
RESET
4
FLIP-FLOP
1
GND
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
©
Harris Corporation 1997
File Number
834.4
8-3
DISCHARGE
OUTPUT
TRIGGER
COMPAR
HARRIS [ HARRIS CORPORATION ]
