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. 

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

ZILOG - Z8430APS -IC, Timers.

NMOS/CMOS Counter timer circuit.

Double marked Z80CTC.

Case: 28 Dip,

Note: Socket Pulls/Used.

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

ST Microelectronics - NE556N IC, timer.

Dual 555.

Package: 14 Dip.

New. On Sale.

Rockwell - R6532P IC, Timer.

RAM-I/O-interval timer (RIOT).

Package: 40 Dip.

Socket Pulls. Used/Removed from Equipment.

Note: Double marked R6532-11

IC, timer. Single. Timing in microseconds through hours. Package: 8 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 - DS12887 - IC. Real Time Clock - CMOS Clock, 24 Pin Dip.

IC. Real time clock. Package: 18 dip in a 24 dip outline. Replaces DS1287 and used in personal computers to keep time, date, and CMOS settings while PC power is off.

Review Dallas Maxim's on-line application notes for features, installation and compatibility instructions prior to purchasing the DS12887 Real Time Clock. 

Status: Discontinued 

Type: Clock/Calendar

Features: Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output

Memory Size: 114B

Time Format: HH:MM:SS (12/24 hr)

Date Format: YY-MM-DD-dd

Interface: Parallel

Voltage – Supply: 4.5V ~ 5.5V

Voltage - Supply, Battery: 2.5V ~ 4V

Current - Timekeeping (Max): 15mA @ 4.5V ~ 5.5V

Operating Temperature: 0°C ~ 70°C

Mounting Type: Through Hole

Package / Case: 24-DIP Module (0.600", 15.24mm)

Note: Genuine Dallas Maxim - Not an inexpensive Chinese Import Copy.

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