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DS1305 Datasheet(PDF) 4 Page - Dallas Semiconductor

Part No. DS1305
Description  Serial Alarm Real-Time Clock
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1305 Datasheet(HTML) 4 Page - Dallas Semiconductor

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PIN DESCRIPTIONS (continued)
PIN
DIP
TSSOP
NAME
FUNCTION
12
15
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).
13
16
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).
14
17
VCCIF
Interface Logic Power-Supply Input. The VCCIF pin allows the DS1305 to drive
SDO and
PF output pins to a level that is compatible with the interface logic,
thus allowing an easy interface to 3V 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.
15
18
PF
Active-Low Power-Fail Output. The
PF pin is used to indicate loss of the
primary power supply (VCC1). When VCC1 is less than VCC2 or is less than VBAT,
the
PF pin is driven low.
16
20
VCC1
Primary Power Supply. DC power is provided to the device on this pin.
OPERATION
The block diagram in Figure 1 shows the main elements of the serial alarm RTC. The following
paragraphs describe the function of each pin.
Figure 1. BLOCK DIAGRAM
1Hz
OSCILLATOR AND
COUNTDOWN CHAIN


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