DS87C530-KCL datasheet(11/45 Pages) MAXIM

Part #	DS87C530-KCL

Description	EPROM/ROM Microcontrollers with Real-Time Clock

Download	45 Pages

Scroll/Zoom	100%

Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

Logo

11 / 45 page

DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock

11 of 45

automatically to occur once per second, once per minute, once per hour, or once per day. Enabling

interrupts with no match will generate an interrupt 256 times per second.

Software enables the timekeeper oscillator using the RTC enable bit in the RTC Control register (F9h).

This starts the clock. It can disable the oscillator to preserve the life of the backup energy-source if

unneeded. Values in the RTC Control register are maintained by the backup source through power failure.

Once enabled, the RTC maintains time for the life of the backup source even when VCC is removed.

The RTC will maintain an accuracy of

2 minutes per month at 25C. Under no circumstances are

negative voltages, of any amplitude, allowed on any pin while the device is in data retention mode

(VCC < VBAT). Negative voltages will shorten battery life, possibly corrupting the contents of internal

SRAM and the RTC.

Figure 2. Real-Time Clock

NONVOLATILE RAM

The 1k x 8 on-chip SRAM can be nonvolatile if an external backup energy source is used. This allows the

device to log data or to store configuration settings. Internal switching circuits will detect the loss of VCC

and switch SRAM power to the backup source on the VBAT pin. The 256 bytes of direct RAM are not

affected by this circuit and are volatile.

CRYSTAL AND BACKUP SOURCES

To use the unique functions of the DS87C530/DS83C530, a 32.768kHz timekeeping crystal and a backup

energy source are needed. The following describes guidelines for choosing these devices.

Timekeeping Crystal

The DS87C530/DS83C530 can use a standard 32.768kHz crystal as the RTC time base. There are two

versions of standard crystals available, with 6pF and 12.5pF load capacitance. The tradeoff is that the 6pF

uses less power, giving longer life while VCC is off, but is more sensitive to noise and board layout. The

Similar Part No. - DS87C530-KCL

Manufacturer	Part #	Datasheet	Description
Maxim Integrated Produc...	DS87C530-KCL	749Kb / 46P	EPROM/ROM Microcontrollers with Real-Time Clock
Dallas Semiconductor	DS87C530-KCL	435Kb / 40P	EPROM MICRO WITH REAL TIME CLOCK
Dallas Semiconductor	DS87C530-KCL	800Kb / 44P	EPROM/ROM Micro with Real Time Clock

Manufacturer	Part #	Datasheet	Description
Maxim Integrated Produc...	DS83C530-DS87C530	749Kb / 46P	EPROM/ROM Microcontrollers with Real-Time Clock
Dallas Semiconductor	DS87C530	866Kb / 47P	EPROM/ROM Microcontrollers with Real-Time Clock
	DS87C530	800Kb / 44P	EPROM/ROM Micro with Real Time Clock
	DS87C530	435Kb / 40P	EPROM MICRO WITH REAL TIME CLOCK
	DS83C520	715Kb / 43P	EPROM/ROM High-Speed Microcontrollers
	DS87C520MCL	877Kb / 44P	EPROM/ROM High-Speed Microcontrollers
Maxim Integrated Produc...	QX87C196KT16	715Kb / 43P	EPROM/ROM High-Speed Microcontrollers REV: 022207
Maxim Integrated Produc...	DS87C520-QNL	715Kb / 43P	EPROM/ROM High-Speed Microcontrollers REV: 022207
Texas Instruments	TMS320F280039C	5Mb / 250P	[Old version datasheet] TMS320F28003x Real-Time Microcontrollers MARCH 2022
Texas Instruments	TMS320F280039C	5Mb / 254P	[Old version datasheet] TMS320F28003x Real-Time Microcontrollers REVISED NOVEMBER 2022