DS1306 Real-Time Clock Datasheet

DS1306 Datasheet, PDF, Equivalent


Part Number

DS1306

Description

Serial Alarm Real-Time Clock

Manufacture

Maxim Integrated

Total Page 22 Pages
Datasheet
Download DS1306 Datasheet


DS1306
DS1306
Serial Alarm Real-Time Clock
BENEFITS AND FEATURES
Completely Manages All Timekeeping
Functions
o 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
o 96-Byte, Battery-Backed NV RAM for
Data Storage
o Two Time-Of-Day Alarms,
Programmable on Combination of
Seconds, Minutes, Hours, and Day of the
Week
o 1Hz and 32.768kHz Clock Outputs
Standard Serial Port Interfaces with Most
Microcontrollers
o Supports Motorola SPI (Serial Peripheral
Interface) Modes 1 and 3 or Standard
3-Wire Interface
o Burst Mode for Reading/Writing
Successive Addresses in Clock/RAM
Multiple Power Supply Pins Ease Adding
Battery for Backup
o Dual-Power Supply Pins for Primary and
Backup Power Supplies
o Optional Trickle Charge Output to
Backup Supply
o 2.0V to 5.5V Operation
Optional Industrial Temperature Range:
-40°C to +85°C Supports Operation in a
Wide Range of Applications
20-Pin TSSOP Minimizes Required Space
Underwriters Laboratory (UL®) Recognized
PIN CONFIGURATIONS
VCC2
VBAT
X1
N.C.
X2
N.C.
INT0
INT1
1Hz
GND
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
TSSOP (4.4mm)
VCC1
N.C.
32kHz
VCCIF
SDO
SDI
SCLK
N.C.
CE
SERMODE
VCC2
VBAT
X1
X2
INT0
INT1
1Hz
GND
1
2
3
4
5
6
7
8
16 VCC1
15 32kHz
14 VCCIF
13 SDO
12 SDI
11 SCLK
10 CE
9 SERMODE
DIP (300 mils)
UL is a registered trademark of Underwriters Laboratories Inc.
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19-5056; Rev 4/15

DS1306
DS1306
ORDERING INFORMATION
PART
TEMP RANGE
DS1306
DS1306+
DS1306N
0°C to +70°C
0°C to +70°C
-40°C to +85°C
DS1306N+
0°C to +70°C
DS1306E
DS1306E+
0°C to +70°C
0°C to +70°C
DS1306EN
-40°C to +85°C
DS1306EN+
DS1306EN/T&R
DS1306EN+T&R
DS1306E/T&R
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
DS1306E+T&R
0°C to +70°C
+Denotes a lead(Pb)-free/RoHS-compliant package
T&R = Tape and reel.
*An “N” on the top mark indicates an industrial device.
PIN-PACKAGE
16 DIP (300 mils)
16 DIP (300 mils)
16 DIP (300 mils)
16 DIP (300 mils)
20 TSSOP (173 mils)
20 TSSOP (173 mils)
20 TSSOP (173 mils)
20 TSSOP (173 mils)
20 TSSOP (173 mils)
20 TSSOP (173 mils)
20 TSSOP (173 mils)
20 TSSOP (173 mils)
TOP MARK*
DS1306
DS1306 +
DS1306N
DS1306N +
DS1306
DS1306 +
DS1306N
DS1306N +
DS1306N
DS1306N +
DS1306
DS1306 +
PIN DESCRIPTION
PIN
TSSOP DIP
NAME
1 1 VCC2
2 2 VBAT
33
54
X1
X2
7 5 INT0
8 6 INT1
FUNCTION
Backup Power Supply. This is the secondary power supply pin. In systems
using the trickle charger, the rechargeable energy source is connected to this
pin.
Battery Input for Any Standard +3V Lithium Cell or Other Energy
Source. If not used, VBAT must be connected to ground. Diodes must not be
placed in series between VBAT and the battery, or improper operation will
result. UL recognized to ensure against reverse charging current when used
in conjunction with a lithium battery. See “Conditions of Acceptability” at
www.maxim-ic.com/TechSupport/QA/ntrl.htm.
Connections for Standard 32.768kHz Quartz Crystal. The internal
oscillator is designed for operation with a crystal having a specified load
capacitance of 6pF. For more information on crystal selection and crystal
layout considerations, refer to Application Note 58, “Crystal Considerations
with Dallas Real-Time Clocks.” The DS1306 can also be driven by an
external 32.768kHz oscillator. In this configuration, the X1 pin is connected
to the external oscillator signal and the X2 pin is floated.
Active-Low Interrupt 0 Output. The INT0 pin is an active-low output of
the DS1306 that can be used as an interrupt input to a processor. The INT0
pin can be programmed to be asserted by Alarm 0. The INT0 pin remains
low as long as the status bit causing the interrupt is present and the
corresponding interrupt enable bit is set. The INT0 pin operates when the
DS1306 is powered by VCC1, VCC2, or VBAT. The INT0 pin is an open-drain
output and requires an external pullup resistor.
Interrupt 1 Output. The INT1 pin is an active-high output of the DS1306
that can be used as an interrupt input to a processor. The INT1 pin can be
programmed to be asserted by Alarm 1. When an alarm condition is present,
the INT1 pin generates a 62.5ms active-high pulse. The INT1 pin operates
only when the DS1306 is powered by VCC2 or VBAT. When active, the INT1
pin is internally pulled up to VCC2 or VBAT. When inactive, the INT1 pin is
2 of 22


Features DS1306 Serial Alarm Real-Time Clock BEN EFITS AND FEATURES • Completely Manag es All Timekeeping Functions o Real-Tim e Clock (RTC) Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Comp ensation Valid Up to 2100 o 96-Byte, Ba ttery-Backed NV RAM for Data Storage o Two Time-Of-Day Alarms, Programmable on Combination of Seconds, Minutes, Hours , and Day of the Week o 1Hz and 32.768k Hz Clock Outputs • Standard Serial Po rt Interfaces with Most Microcontroller s o Supports Motorola SPI (Serial Perip heral Interface) Modes 1 and 3 or Stand ard 3-Wire Interface o Burst Mode for R eading/Writing Successive Addresses in Clock/RAM • Multiple Power Supply Pin s Ease Adding Battery for Backup o Dual -Power Supply Pins for Primary and Back up Power Supplies o Optional Trickle Ch arge Output to Backup Supply o 2.0V to 5.5V Operation • Optional Industrial Temperature Range: -40°C to +85°C Sup ports Operation in a Wide Range of Applications • 20-Pin TSSOP Minimizes .
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