DS1305
Serial Alarm Real Time Clock (RTC)
www.dalsemi.com
FEATURES
Real time clock counts seconds, minutes,
hours, date of the month, month, day of the
week and year with leap year compensation
valid up to 2100
96-byte nonvolatile RAM for data storage
Two time-of-day alarms programmable on
combination of seconds, minutes, hours and
day of the week
Serial interface supports Motorola serial
peripheral interface (SPI) serial data ports or
standard 3-wire interface
Burst mode for reading/writing successive
addresses in clock/RAM
Dual power supply pins for primary and
backup power supplies
Optional trickle charge output to backup
supply
2.0 - 5.5V operation
Optional industrial temperature range
-40°C to +85°C
Available in space-efficient, 20-pin TSSOP
package
Recognized by Underwriters Laboratory
PIN ASSIGNMENT
V
CC2
V
BAT
X1
NC
X2
NC
INT0
NC
INT1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC1
NC
PF
V
CCIF
SD0
SDI
SCLK
NC
CE
SERMODE
DS1305 20-Pin TSSOP (173 mil)
V
CC2
V
BAT
X1
X2
NC
INT0
INT1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC1
PF
V
CCIF
SDO
SDI
SCLK
CE
SERMODE
ORDERING INFORMATION
DS1305
DS1305N
DS1305E
DS1305EN
16-Pin DIP
16-Pin DIP (Industrial)
20-Pin TSSOP
20-Pin TSSOP (Industrial)
DS1305 16-Pin DIP (300 mil)
1 of 22
070900
DALLAS [ DALLAS SEMICONDUCTOR ]
