MAX6900 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – I2C-Compatible RTC in a TDFN

19-1942; Rev 3; 6/03
I²C-Compatible RTC in a TDFN
General Description
The MAX6900, I²C™-bus-compatible real-time clock
(RTC) in a 6-pin TDFN package contains a real-time
clock/calendar and 31-byte ✕ 8-bit wide of static ran-
dom access memory (SRAM). The real-time clock/cal-
endar provides seconds, minutes, hours, day, date,
month, and year information. The end of the month date
is automatically adjusted for months with fewer than 31
days, including corrections for leap year up to the year
2100. The clock operates in either the 24hr or 12hr for-
mat with an AM/PM indicator.
Portable Instruments
Point-of-Sale Equipment
Intelligent Instruments
Battery-Powered Products
Applications
I²C is a trademark of Philips Corp. Purchase of I²C components
of Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I²C
Patent Rights to use these components in an I²C system, provid-
ed that the system conforms to the I²C Standard Specification
as defined by Philips.
PART
SERIAL BUS
SRAM
MAX6900
I²C compatible
MAX6901
3-wire
MAX6902
SPI™ compatible
SPI is a trademark of Motorola, Inc.
31 ✕ 8
31 ✕ 8
31 ✕ 8
Pin Configuration
TOP VIEW
VCC 1
X1 2
MAX6900
6 SDA
5 SCL
X2 3
TDFN
4 GND
Features
o Real-Time Clock Counts Seconds, Minutes,
Hours, Date, Month, Day, and Year
o Leap Year Compensation Valid up to Year 2100
o Fast (400kHz) I²C-Bus-Compatible Interface from
2.0V to 5.5V
o 31 ✕ 8 SRAM for Scratchpad Data Storage
o Uses Standard 32.768kHz, 12.5pF Load, Watch
Crystal
o Ultra-Low 225nA (typ) Timekeeping Current
o Single-Byte or Multiple-Byte (Burst Mode) Data
Transfer for Read or Write of Clock Registers or
SRAM
o 6-Pin 3mm x 3mm x 0.8mm TDFN Surface-Mount
Package
o No External Crystal Bias Resistors or Capacitors
Required
Ordering Information
PART
MAX6900ETT-T
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
6 TDFN
TOP
MARK
AEU
Related Real-Time Clock Products
ALARM
FUNCTION
—
Polled
Polled
OUTPUT
FREQUENCY
—
32kHz
—
PIN-PACKAGE
6 TDFN
8 TDFN
8 TDFN
Typical Operating Circuit
VCC
VCC
RPU
RPU
0.01µF ^VCC
µC
RPU = tr/Cbus
1
5
SCL
VCC
X1 ²
MAX6900
6 _SDA
GND
3
X2
4
CRYSTAL
________________________________________________________________ Maxim Integrated Products 1
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