19-5055; Rev 12/09
DS1305
Serial Alarm Real-Time Clock
www.maxim-ic.com
FEATURES
Real-Time Clock (RTC) 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, Battery-Backed NV RAM for Data
Storage
Two Time-Of-Day Alarms, Programmable
on Combination of Seconds, Minutes, Hours,
and Day of the Week
Supports Motorola SPI
™
(Serial Peripheral
Interface) Modes 1 and 3 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
2.0V to 5.5V Operation
Optional Industrial Temperature Range:
-C to +85C
Available in Space-Efficient, 20-Pin TSSOP
Package
Underwriters Laboratory (UL) Recognized
PIN CONFIGURATIONS
TOP VIEW
V
CC2
V
BAT
X1
N.C.
X2
N.C.
INT0
N.C.
INT1
GND
1
2
3
4
5
6
7
8
9
10
20
V
CC1
N.C.
PF
V
CCIF
SD0
SDI
SCLK
N.C.
CE
SERMODE
DS1305
19
18
17
16
15
14
13
12
11
TSSOP (4.4mm)
V
CC2
V
BAT
X1
X2
N.C.
INT0
INT1
GND
1
2
3
4
5
6
7
8
16
15
V
CC1
PF
V
CCIF
SDO
SDI
SCLK
CE
SERMODE
DS1305
14
13
12
11
10
9
DIP (300 mils)
SPI is a trademark of Motorola, Inc.
TYPICAL OPERATING CIRCUIT
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