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MC146818A, DS1287 used in Commodore and Amiga equipment

IC numbers

MC146818A, DS1287

IC function

Real Time Clock plus RAM

Component documentation

IC number	Manufacturer	Documentation
MC146818A	Motorola	Not available
DS1287	Dallas Semiconductor (now Maxim)	DS1287 Datasheet (PDF, local), DS12887 Web site, DS12887 Datasheet (PDF)

Component versions

IC number	Package	Battery and quartz included	CBM part number	CBM part description
MC146818A	24-pin DIP	No	390305-01	MC146818/A
MC146818A	24-pin DIP	No	380259-01	IC, M146818A RTC/CMOS RAM
DS1287	24-pin DIP	Yes	390417-01	DS1287 RTS/CMOS RAM

Positions

Device	Position	Components	Package
A2286 sandwich board	U52	DS1287, MC146818A	DIP
PC30-III	U201	DS1287, MC146818A	DIP
PC40-III	U201	MC146818A	DIP

Pinout MC146818A

Pin	Type	Name
1	Input	MOT
2	Input	OSC1
3	Output	OSC2
4..11	I/O	AD0..AD7
12	Power	VSS
13	Input	CS_
14	Input	AS
15	Input	R/W_
16	Input	STBY_
17	Input	DS
18	Input	RESET_
19	Output	IRQ_
20	Input	CKFS
21	Output	CKOUT
22	Input	PS
23	Output	SQW
24	Power	VDD

Pinout DS1287

Pin	Type	Name
1	Input	MOT
2..3	N/C	NC
4..11	I/O	AD0..AD7
12	Power	GND
13	Input	CS_
14	Input	AS
15	Input	R/W_
16	N/C	NC
17	Input	DS
18	Input	RESET_
19	Output	IRQ_
20..22	N/C	NC
23	Output	SQW
24	Power	VCC

Copyright © 2004-2005 Ronald van Dijk - All rights reserved
Last update: 10 September 2005