Rainbow Electronics MAX6900 - Manual

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
General Description
The MAX6900, I 2 C™-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.
Applications
Portable Instruments
Point-of-Sale Equipment
Intelligent Instruments
Battery-Powered Products
Features
♦ Real-Time Clock Counts Seconds, Minutes,
Hours, Date, Month, Day, and Year
♦ Leap Year Compensation Valid up to Year 2100
♦ Fast (400kHz) I
2 C-Bus-Compatible Interface from
2.0V to 5.5V
♦ 31 ✕ 8 SRAM for Scratchpad Data Storage
♦ Uses Standard 32.768kHz, 12.5pF Load, Watch
Crystal
♦ Ultra-Low 225nA (typ) Timekeeping Current
♦ Single-Byte or Multiple-Byte (Burst Mode) Data
Transfer for Read or Write of Clock Registers or
SRAM
♦ 6-Pin 3mm x 3mm x 0.8mm TDFN Surface-Mount
Package
♦ No External Crystal Bias Resistors or Capacitors
Required
MAX6900
I
2
C-Compatible RTC in a TDFN
________________________________________________________________ Maxim Integrated Products 1
µC
RPU RPU
0.01 µF
CRYSTAL
X1 SCL
SDA
5 2
3
4
1
6
X2
GND
RPU = t r /C bus
V CC
V CC
V CC
V CC
MAX6900
19-1942; Rev 3; 6/03
Typical Operating Circuit
X1
GND X2
1 6 SDA
5 SCL
V CC
MAX6900
TDFN
TOP VIEW
2
3 4
Pin Configuration
Ordering Information
PART TEMP RANGE
PIN-
PACKAGE TOP
MARK
MAX6900ETT-T -40 °C to +85°C 6 TDFN AEU
Related Real-Time Clock Products
PART SERIAL BUS SRAM
ALARM
FUNCTION
OUTPUT
FREQUENCY
PIN-PACKAGE
MAX6900 I 2 C compatible 31 ✕ 8 — — 6 TDFN
MAX6901 3-wire 31 ✕ 8 Polled 32kHz 8 TDFN
MAX6902 SPI™ compatible 31 ✕ 8 Polled — 8 TDFN
I 2 C is a trademark of Philips Corp. Purchase of I 2 C components
of Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I
2 C
Patent Rights to use these components in an I 2 C system, provid-
ed that the system conforms to the I 2 C Standard Specification
as defined by Philips.
SPI is a trademark of Motorola, Inc.