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

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.

Rockwell - R6532P IC, Timer.

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

Package: 40 Dip.

Socket Pulls. Used/Removed from Equipment.

Note: Double marked R6532-11

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.

Motorola - MC68B40P - IC, Timer.

The MC6840 is a programmable subsystem component of the M6800 Family designed to provide variable system time intervals. The MC6840 has three 16-bits binary counters, three corresponding control registers, and status register. These counters are under software control and may be used to cause system interrupts and or generate output signals.

Programmable timer module (PTM).

Package: 28 Dip.

Genuine Motorola - New Old Stock.

Motorola - MC68B40P - IC, Timer.

The MC6840 is a programmable subsystem component of the M6800 Family designed to provide variable system time intervals. The MC6840 has three 16-bits binary counters, three corresponding control registers, and status register. These counters are under software control and may be used to cause system interrupts and or generate output signals.

Programmable timer module (PTM).

Package: 28 Dip.

Genuine Motorola - New Old Stock.

Intel - P8253-5 IC, Timer.

Status: Discontinued

Programmable interval timer.

Case: 24 Dip.

Additional Information: http://www.datasheetcatalog.com/datasheets_pdf/P/8/2/5/P8253-5.shtml

Note: New. Rare & Difficult IC to Find