1338-31DCGI8 IDT, Integrated Device Technology Inc, 1338-31DCGI8 Datasheet - Page 2

• Manufacturer Part Number: 1338-31DCGI8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 1338-31DCGI8

• Bus Type: Serial (I2C)
• User Ram: 56Byte
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 8
• Mounting: Surface Mount
• Date Format: DW:DM:M:Y
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Compliant

Pin Assignment
Pin Descriptions
IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 2
8MSOP,
IDT1338
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM
8SOIC
—
1
2
3
4
5
6
7
8
Number
Pin
GND
V
BAT
X1
X2
16SOIC
4 - 13
14
15
16
—
—
1
2
3
1
2
3
4
1338
SQW/OUT Square-Wave/Output driver. When enabled and the SQWE bit set to 1, the SQW/OUT pin
(8-pin MSOP/8-pin SOIC)
IDT
Name
GND
V
SDA
Pin
SCL
V
NC
X1
X2
BAT
CC
8
7
6
5
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 12.5 pF. An external
32.768 kHz oscillator can also drive the IDT1338. In this configuration, the X1 pin is connected to
the external oscillator signal and the X2 pin is left floating.
Backup Supply Input for Lithium Coin Cell or Other Energy Source. Battery voltage must be held
between the minimum and maximum limits for proper operation. Diodes placed in series
between the backup source and the V
not required, V
Connect to ground.
Serial data input/output. SDA is the input/output pin for the I
output and requires an external pull-up resistor (2 Kohm 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 Kohm typical)
outputs one of four square-wave frequencies (1 Hz, 4 kHz, 8 kHz, 32 kHz). It is an open drain
output and requires an external pull-up resistor (10K ohm typical). Operates when the device is
powered with VCC or V
Device power supply. When voltage is applied within specified limits, the device is fully
accessible by I
No connect. These pins are unused and must be connected to ground for proper operation.
SQW/OUT
VCC
SCL
SDA
2
BAT
C and data can be written and read.
must be connected to ground.
BAT
.
Pin Assignment
Pin Description/Function
BAT
pin may prevent proper operation. If a backup supply is
SQW/OUT
VCC
SCL
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
(16-pin SOIC)
2
C serial interface. It is an open-drain
1338C
IDT
IDT1338
16
15
14
13
12
11
10
9
V
GND
NC
NC
NC
NC
NC
SDA
BAT
REV K 032910
RTC