IDT1338 CLOCK Datasheet

IDT1338 Datasheet, PDF, Equivalent


Part Number

IDT1338

Description

REAL-TIME CLOCK

Manufacture

Renesas

Total Page 24 Pages
Datasheet
Download IDT1338 Datasheet


IDT1338
DATASHEET
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM IDT1338
General Description
The IDT1338 is a serial real-time clock (RTC) device that
consumes ultra-low power and provides a full binary-coded
decimal (BCD) clock/calendar with 56 bytes of battery
backed Non-Volatile Static RAM. The clock/calendar
provides seconds, minutes, hours, day, date, month, and
year information. The clock operates in either the 24-hour
or 12-hour format with AM/PM indicator. The end of the
month date is automatically adjusted for months with fewer
than 31 days, including corrections for leap year. Access to
the clock/calendar registers is provided by an I2C interface
capable of operating in fast I2C mode. Built-in Power-sense
circuitry detects power failures and automatically switches
to the backup supply, maintaining time and date operation.
Applications
Telecom (Routers, Switches, Servers)
Handheld (GPS, Point of Sale POS terminals)
Consumer Electronics (Set-Top Box, Digital Recording,
Network Applications, Digital photo frames)
Office (Fax/Printers, Copiers)
Medical (Glucometer, Medicine Dispensers)
Others (Thermostats, Vending Machines, Modems, Utility
Meters)
Block Diagram
Features
Real-Time Clock (RTC) counts seconds, minutes, hours,
day, date, month, and year with leap-year compensation
valid up to 2100
56-Byte battery-backed Non Volatile RAM for data
storage
Fast mode I2C Serial interface
Automatic power-fail detect and switch circuitry
Programmable square-wave output
Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC
(surface-mount package with an integrated crystal)
Industrial temperature range (-40°C to +85°C)
Crystal inside package
for 16-pin SOIC ONLY
X1
X2
32.768 kHz
Oscillator and
Divider
1 Hz/4.096 kHz/
8.192 kHz/32.768 kHz
MUX/
Buffer
SQW/OUT
VCC
GND
VBAT
Power
Control
Control
Logic
Clock, Calendar
Counter
SCL
SDA
I2C
Interface
56 Byte 1 Byte 7 Bytes
RAM Control Buffer
IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM
1
IDT1338
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IDT1338
IDT1338
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM
RTC
Pin Assignment (8-pin MSOP/8-pin SOIC) Pin Assignment (16-pin SOIC)
X1 1
8 VCC
X2 2 IDT 7 SQW/OUT
VBAT
3 1338 6
SCL
GND 4
5 SDA
Pin Descriptions
SCL
SQW/OUT
VCC
NC
NC
NC
NC
NC
1 16
2 15
3 14
4 IDT 13
5
1338C
12
6 11
7 10
89
SDA
GND
VBAT
NC
NC
NC
NC
NC
Pin
Number
8MSOP, 16SOIC
8SOIC
Pin
Name
Pin Description/Function
1 — X1 Connections for standard 32.768 kHz quartz crystal. The internal oscillator circuitry is designed
2 — X2 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.
3 14 VBAT 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 VBAT pin may prevent proper operation. If a backup supply is
not required, VBAT must be connected to ground.
4 15 GND Connect to ground.
5 16 SDA Serial data input/output. SDA is the input/output pin for the I2C serial interface. It is an open-drain
output and requires an external pull-up resistor (2 Kohm typical).
6 1 SCL 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)
7 2 SQW/OUT Square-Wave/Output driver. When enabled and the SQWE bit set to 1, the SQW/OUT pin
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 VBAT.
8 3 VCC Device power supply. When voltage is applied within specified limits, the device is fully
accessible by I2C and data can be written and read.
4 - 13
NC No connect. These pins are unused and must be connected to ground for proper operation.
IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM
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IDT1338
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Features DATASHEET REAL-TIME CLOCK WITH BATTERY B ACKED NON-VOLATILE RAM IDT1338 General Description The IDT1338 is a serial re al-time clock (RTC) device that consume s ultra-low power and provides a full b inary-coded decimal (BCD) clock/calenda r with 56 bytes of battery backed Non-V olatile Static RAM. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. T he end of the month date is automatical ly adjusted for months with fewer than 31 days, including corrections for leap year. Access to the clock/calendar reg isters is provided by an I2C interface capable of operating in fast I2C mode. Built-in Power-sense circuitry detects power failures and automatically switch es to the backup supply, maintaining ti me and date operation. Applications • Telecom (Routers, Switches, Servers) Handheld (GPS, Point of Sale POS ter minals) • Consumer Electronics (Set-Top Box, Digital Recording, Net.
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