1339-2DVGI IDT, 1339-2DVGI Datasheet - Page 2

• Manufacturer Part Number: 1339-2DVGI
• Description: Real Time Clock RTC BASE
• Manufacturer: IDT

Specifications of 1339-2DVGI

• Rohs: yes
• Part # Aliases: IDT1339-2DVGI

Pin Assignment
Pin Descriptions
IDT® REAL-TIME CLOCK WITH SERIAL I
MSOP SOIC
IDT1339
REAL-TIME CLOCK WITH SERIAL I
—
1
2
3
4
5
6
7
8
Number
V
Pin
BACKUP
GND
4 - 13
X1
X2
14
15
16
—
—
1
2
3
1
2
3
4
SQW/INT Square-Wave/Interrupt output. Programmable square-wave or interrupt output signal. The
V
Name
BACKUP
GND
SDA
SCL
Pin
V
NC
X1
X2
CC
1339
(8-pin MSOP/8-pin SOIC)
IDT
Connections for standard 32.768 kHz quartz crystal. The internal oscillator circuitry is
designed for operation with a crystal having a specified load capacitance (CL) of 7 pF. An
external 32.768 kHz oscillator can also drive the IDT1339. In this configuration, the X1 pin
is connected to the external oscillator signal and the X2 pin is left floating.
Backup supply input. Supply voltage must be held between 1.3 V and 3.7 V for proper
operation. This pin can be connected to a primary cell, such as a lithium button cell.
Additionally, this pin can be connected to a rechargeable cell or a super cap that can be
charged using the trickle charger circuit. Diodes placed in series between the backup
source and the VBAT pin may prevent proper operation. If a backup supply is not required,
VBAT must be connected to ground. UL recognized to ensure against reverse charged
current when used with a lithium cell.
Connect to ground. DC power is provided to the device on these pins.
Serial data input/output. SDA is the input/output pin for the I
is an open-drain output and requires an external pull-up resistor (2 k typical).
Serial clock input. SCL is used to synchronize data movement on the serial interface. It is an
open-drain output and requires an external pull-up resistor (2 k typical).
SQW/INT pin is an open-drain output and requires an external pull-up resistor (10 k
typical).
Primary power supply. When voltage is applied within normal limits, the device is fully
accessible and data can be written and read.
No connect. These pins are unused and must be connected to ground.
2
C INTERFACE
8
7
6
5
2
C INTERFACE
VCC
SCL
SDA
SQW/INT
2
Pin Description/Function
Pin Assignment
SQW/INT
VCC
SCL
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
1339C
(16-pin SOIC)
IDT
2
C serial interface. The SDA pin
IDT1339
16
15
14
13
12
11
10
9
V
GND
SDA
NC
NC
NC
NC
NC
BACKUP
REV R 121012
RTC