Rev 0; 12/06
2
Accurate I C RTC with Integrated
TCXO/Crystal/FRAM
DS2x35
General Description
Features
o Integrated 32.768kHz Crystal
o Fast (400kHz) I2C Interface
The DS32x35 accurate real-time clock (RTC) is a tem-
perature-compensated clock/calendar that includes an
integrated 32.768kHz crystal and a bank of nonvolatile
memory in a single package. The nonvolatile memory is
available in two densities: 2048 x 8 and 8192 x 8 bits.
The integration of the crystal resonator enhances the
long-term accuracy of the device as well as reduces
the piece part count in a manufacturing line. The device
o RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap Year Compensation
Valid Up to 2100
o RTC Accuracy 2ppm from 0°C to +40°C
o RTC Accuracy 3.5ppm from -40°C to 0°C and
+40°C to +85°C
2
operates as a slave device on an I C serial interface,
o Nonvolatile Memory with 10 Years of Guaranteed
and is available in both commercial and industrial tem-
perature ranges in a 300-mil, 20-pin SO package.
Backup Time and Write Protection
o Two Available Densities of Nonvolatile Memory
2048 Bytes (DS32B35)
The DS32x35 includes a bank of nonvolatile memory
that does not require a backup energy source to main-
tain memory contents. In addition, there are no read or
write cycle limitations. The memory array can be
accessed at maximum cycle rates for the life of the
product with no wear-out mechanisms.
8192 Bytes (DS32C35)
o No Cycle Limitations on Memory
o Power-Switching Circuit Selects Between Main
Power and Battery Backup for the RTC
o Programmable Square Wave with Frequency of
32.768kHz, 8.192kHz, 4.096kHz, or 1Hz
Other device features include two time-of-day alarms, a
selectable output that provides either an interrupt or pro-
grammable square wave, and a calibrated 32.768kHz
square-wave output. A reset input/output pin provides a
power-on reset. Additionally, the reset pin is monitored
as a pushbutton input for generating a reset externally.
o Two Time-of-Day Alarms
o Reset Output/Pushbutton Reset (Debounced)
Input
o Programmable Output Provides Interrupt or
Square Wave
o Calibrated 32.768kHz Open-Drain Output
o Temp Sensor with 3°C Accuracy
o 3.3V Operating Voltage
o Commercial and Industrial Temperature Ranges
o 300-mil, 20-Pin SO Package
o Underwriters Laboratories (UL) Recognized
A precision temperature-compensated reference and
comparator circuit monitors the status of V
and auto-
CC
matically switches to the backup supply when neces-
sary. The backup supply maintains operation of the
2
TCXO, clock, alarms, and RTC I C operation.
Applications
Servers
Utility Power Meters
Pin Configuration and Ordering Information appear at end
of data sheet.
Telematics
GPS
Typical Operating Circuit
V
V
CC
CC
R
= t /C
R B
PU
V
CC
R
R
PU
PU
V
SCL
SCL
CC
INT/SQW
32kHz
CPU
SDA
WP
V
BAT
DS32x35
RST
N.C.
N.C.
GND
N.C.
PUSHBUTTON
RESET
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
GND
______________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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