DS1672U-3 Maxim Integrated Products, DS1672U-3 Datasheet - Page 7

• Manufacturer Part Number: DS1672U-3
• Description: IC TIMEKEEPER 3V 32-BIT 8-USOP
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/Trickle-Chargerr

Specifications of DS1672U-3

• Time Format: Binary
• Date Format: Binary
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -

PIN DESCRIPTION
Figure 3. Recommended Layout for Crystal
PIN
1, 2
3
4
5
6
7
8
LOCAL GROUND PLANE (LAYER 2)
V
CRYSTAL
NAME
X1, X2
GND
SDA
BACKUP
SCL
RST
V
CC
Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator
circuitry is designed for operation with a crystal having a specified load
capacitance (CL) of 6pF. For more information about crystal selection and
crystal layout considerations, refer to Application Note 58: Crystal
Considerations with Dallas Real-Time Clocks. The DS1672 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
Battery Input for Any Standard 3V Lithium Cell or Other Energy Source.
Battery voltage must be held between 1.3V and 3.63V for proper operation.
Diodes placed in series between the power source and the V
in improper operation. If a backup supply is not required, V
grounded. UL recognized to ensure against reverse charging current when used
in conjunction with a lithium battery (charger disabled). See “Conditions of
Acceptability” at
Ground. DC power is provided to the device on this pin.
Serial-Data Input/Output. SDA is the input/output pin for the I
interface. The SDA pin is open drain and requires an external pullup resistor.
I
serial interface and requires an external pullup resistor.
Active-Low Reset Output. It functions as a microprocessor reset signal. This
pin is an open-drain output and requires an external pullup resistor.
Power Pin for Primary Power Supply. When V
limits, the device is fully accessible and data can be written and read. When
V
2
C Serial-Clock Input. SCL is used to synchronize data movement on the
CC
is below V
GND
X1
X2
PF
, reads and writes are inhibited.
www.maxim-ic.com/qa/info/ul.
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FUNCTION
CC
is applied within normal
BACKUP
BACKUP
2
C serial
.
must be
may result