|
|
PDF DS12887A Data sheet ( Hoja de datos )
| Número de pieza | DS12887A | |
| Descripción | Real Time Clock | |
| Fabricantes | Dallas | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de DS12887A (archivo pdf) en la parte inferior de esta página. Total 2 Páginas | ||
|
No Preview Available !
www.dalsemi.com
DS12887A
Real Time Clock
FEATURES
§ Drop–in replacement for IBM AT computer
clock/calendar
§ Pin compatible with the MC146818B and
DS1287A
§ Totally nonvolatile with over 10 years of
operation in the absence of power
§ Self–contained subsystem includes lithium,
quartz, and support circuitry
§ Counts seconds, minutes, hours, days, day of
the week, date, month, and year with leap
year compensation valid up to 2100
§ Binary or BCD representation of time,
calendar, and alarm
§ 12– or 24–hour clock with AM and PM in
12–hour mode
§ Daylight Savings Time option
§ Selectable between Motorola and Intel bus
timing
§ Multiplex bus for pin efficiency
§ Interfaced with software as 128 RAM
locations
– 14 bytes of clock and control registers
– 114 bytes of general purpose RAM
§ Programmable square wave output signal
§ Bus–compatible interrupt signals ( IRQ )
§ Three interrupts are separately software–
maskable and testable
– Time–of–day alarm once/second to
once/day
– Periodic rates from 122 µs to 500 ms
– End of clock update cycle
PIN ASSIGNMENT
PIN DESCRIPTION
AD0-AD7 - Multiplexed Address/Data Bus
NC - No Connection
MOT
- Bus Type Selection
CS - Chip Select
AS - Address Strobe
R/ W - Read/Write Input
DS - Data Strobe
RESET
- Reset Input
IRQ - Interrupt Request Output
SQW
VCC
- Square Wave Output
- +5 Volt Supply
RCLR
GND
- RAM Clear
- Ground
DESCRIPTION
The DS12887A Real Time Clock plus RAM is designed to be a direct replacement for the DS1287A. The
DS12887A is identical in form, fit, and function to the DS1287A, and has an additional 64 bytes of
general purpose RAM. Access to this additional RAM space is determined by the logic level presented on
AD6 during the address portion of an access cycle. The RCLR pin is used to clear (set to logic 1) all 114
bytes of general purpose RAM but does not affect the RAM associated with the real time clock. In order
1 of 2
031899
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet DS12887A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS12887 | Real Time Clock | Dallas |
| DS12887 | (DS12xxx) Real Time Clock |  Maxim Integrated Products |
| DS12887A | (DS12xxx) Real Time Clock | Maxim Integrated Products |
| DS12887A | Real Time Clock | Dallas |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |