6420

Supply Voltage
                                                                                       +18V
Power Dissipation
(Note 2)
 LM555H                                                                         760 mW
 LM555J                                                                          1180mW
Operating Temperature Range
                                                                                      -55 C to +125 C
Maximum Junction Temperature
                                                                                      150 C
Storage Temperature Range
                                                                                      -65 C to +150 C
Soldering Information
Dual-In-Line Package
   (Soldering, 10 seconds)                                              260 C
Thermal Resistance
ThetaJA
   CERDIP      (Still Air)                                                    125 C/W
                (500LF/Min Air flow)                                       71 C/W
   METAL CAN   (Still Air)                                                 176 C/W
                (500LF/Min Air flow)                                       96 C/W
ThetaJC
    CERDIP                                                                       20 C/W
    METAL CAN                                                                 42 C/W
ESD Tolerance
(Note 3)
                                                                                       500V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.

Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), ThetaJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax (Tjmax - TA)/ThetaJA or the number given in the Absolute Maximum Ratings, whichever is lower.

Note 3: Human body model, 1.5K Ohms in series with 100pF.

The 6420 is a highly stable device for generating accurate time delays or oscillation.Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits.