Timers

Motorola - MC1555U - IC, Timer.

The MC1555/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 of operation, the 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.

Status: Discontinued

Single RC-Type Timer.

P(D) Max.(W) Power Dissipation=625m

Nom. Supp (V)=15.

Genuine Motorola - New Old Stock - Very Rare

Package 8 CDIP, Case 693-02. 

National Semiconductor Corp - MM5456N - IC, Timer.

Digital alarm clock.

Monolithic MOS Integrated Circuit.

Case: 22 Dip.

New.

Reference: https://html.datasheetq.com/pdf-html/518108/National-Semiconductor/1page/MM5456N.html?lang=en

Advanced Micro Devices - P8253-5 IC, Timer.

Status: Discontinued

Programmable Interval Timer.

Case: 24 Dip.

Note: Clean Socket Pulls.

Used/Removed from equipment.

Rare and Difficult IC to find.

National Semiconductor Corp - LM555H  IC, timer.

Package: TO-99/8 Metal can.

New Old Stock

National Semiconductor Corp - LM555H - IC, Timer.

Number of Internal Timers: 1 Timer        

Supply Voltage - Max: 18 V         

Supply Voltage - Min: 4.5 V         

Operating Temperature: - 55 C to + 125 C                             

Mounting Style: Through Hole   

Package / Case: TO-99   

High Level Output Current: 200 mA         

Length: 9.14 mm             

Low Level Output Current: - 200 mA       

Pd - Power Dissipation:  760 mW

Note: National Semicoductor ICs where trnsferred to Texas Instruments.

ST Microelectronics - NE556N IC, timer.

Dual 555.

Package: 14 Dip.

New. 

National Semiconductor Corp - LM555H/883B IC. Timer.

Package: New TO-99 Gold Leads.

Some may have test dots.

Operating Temperaure: -55 C to 125 C

Storage Temperature: -65 C to 150 C

Bulk Packed

NSN: 5962-01-131-1230

National Semiconductor Corp - LM3905N - IC, Timer. Precision.

Timing periods from microseconds to hours.

Operates from 4.5 to 40V supplies.

Input protected from +/-40V.

Timing period can be voltage controlled.

TTL compatible input and output.

Package: 8 Dip.

Genuine National Semiconductor - New Old Stock

Dallas - Maxim Integrated - DS2417 IC, Timer.

The DS2417 1-Wire Time Chip with Interrupt offers a simple solution for storing and retrieving vital time information with minimal hardware. The DS2417 contains a unique lasered ROM and a real-time clock/calendar implemented as a binary counter. Only one pin is required for communication with the device. Utilizing a backup energy source, the data is nonvolatile and allows for stand-alone operation. The DS2417 features can be used to add functions such as calendar, time and date stamp, and logbook to any type of electronic device or embedded application that uses a microcontroller.

1-Wire Time Chip with Interrupt.

Package: 6 Pin TSOC SMD.

Note: Dallas Semiconductor was aquired by Maxim Integrated