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DS1305 Datasheet

  • DS1305

  • Serial Alarm Real Time Clock (RTC)

  • Dallas   Dallas

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DS1305
DS1305 BLOCK DIAGRAM
Figure 1
SIGNAL DESCRIPTIONS
V
CC1
- DC power is provided to the device on this pin. V
CC1
is the primary power supply.
V
CC2
- This is the secondary power supply pin. In systems using the trickle charger, the rechargeable
energy source is connected to this pin.
V
BAT
- Battery input for any standard 3-volt lithium cell or other energy source.
V
CCIF
(Interface Logic Power Supply Input)
- The V
CCIF
pin allows the DS1305 to drive SDO and
PF
out-put pins to a level that is compatible with the interface logic, thus allowing an easy interface to 3-volt
logic in mixed supply systems. This pin is physically connected to the source connection of the p-channel
transistors in the output buffers of the SDO and
PF
pins.
SERMODE (Serial Interface Mode Input)
-
The SERMODE
pin offers the flexibility to choose
between two serial interface modes. When connected to GND, standard 3-wire communication is
selected. When connected to V
CC
, Motorola SPI communication is selected.
SCLK (Serial Clock Input)
- SCLK is used to synchronize data movement on the serial interface for
either the SPI or 3-wire interface.
SDI (Serial Data Input)
- When SPI communication is selected, the SDI pin is the serial data input for
the SPI bus. When 3-wire communication is selected, this pin must be tied to the SDO pin (the SDI and
SDO pins function as a single I/O pin when tied together).
SDO (Serial Data Output)
- When SPI communication is selected, the SDO pin is the serial data output
for the SPI bus. When 3-wire communication is selected, this pin must be tied to the SDI pin (the SDI
and SDO pins function as a single I/O pin when tied together).
3 of 22

DS1305 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 25

  • 集成電路 (IC)

  • 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘

  • -

  • 時(shí)鐘/日歷

  • 警報(bào)器，閏年，NVSRAM，涓流充電器

  • 96B

  • HH:MM:SS（12/24 小時(shí)）

  • YY-MM-DD-dd

  • SPI

  • 2 V ~ 5.5 V

  • 2 V ~ 5.5 V

  • 0°C ~ 70°C

  • 通孔

  • 16-DIP（0.300"，7.62mm）

  • 16-PDIP

  • 管件

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