DS1305 Datasheet, PDF (1/22 Pages) Dallas Semiconductor – Serial Alarm Real Time Clock RTC

19-5055; Rev 12/09
www.maxim-ic.com
DS1305
Serial Alarm Real-Time Clock
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 +85C
 Available in Space-Efficient, 20-Pin TSSOP
Package
 Underwriters Laboratory (UL) Recognized
SPI is a trademark of Motorola, Inc.
PIN CONFIGURATIONS
TOP VIEW
V_CC2
V_BAT
X1
N.C.
X2
N.C.
INT0
N.C.
INT1
GND
1
20
2
19
DS1305
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
TSSOP (4.4mm)
V_CC1
N.C.
PF
V_CCIF
SD0
SDI
SCLK
N.C.
CE
SERMODE
V_CC2
V_BAT
X1
X2
N.C.
INT0
INT1
GND
1
16
2
15
3 ^DS1305 14
4
13
5
12
6
11
7
10
8
9
DIP (300 mils)
V_CC1
PF
V_CCIF
SDO
SDI
SCLK
CE
SERMODE
TYPICAL OPERATING CIRCUIT
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