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V30218S Datasheet

  • V30218S

  • Ultra Low Power 1-Bit 32 kHz RTC

  • 12頁

  • ETC

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R
EM MICROELECTRONIC-MARIN SA
V3021
Ultra Low Power 1-Bit 32 kHz RTC
Features
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Supply current typically 800 nA at 3 V
50 ns access time with 50 pF load capacitance
Fully operational from 2.0 V to 5.5 V
No busy states or danger of a clock update while
accessing
Serial communication on one line of a standard parallel
data bus or over a conventional 3 wire serial interface
Interface compatible with both Intel and Motorola
Seconds, minutes, hours, day of month, month, year, week
day and week number in BCD format
Leap year and week number correction
Time set lock mode to prevent unauthorized setting of the
current time or date
Oscillator stability 0.3 ppm / volt
No external capacitor needed
Frequency measurement and test modes
Temperature range - 40 to +85
o
C
Packages DIP8 and SO8
Typical Operating Configuration
WR or R/W
RD or DS
CPU
Address
Decoder
ADDRESS BUS
DATA BUS
CS
RD
WR
I/O
XI
XO
V3021
Description
The V3021 is a low power CMOS real time clock. Data is
transmitted serially as 4 address bits and 8 data bits, over one
line of a standard parallel data bus. The device is accessed by
chip select (CS) with read and write control timing provided by
either RD and WR pulse (Intel CPU) or DS with advanced R/W
(Motorola CPU). Data can also be transmitted over a
conventional 3 wire serial interface having CLK, data I/O and
strobe. The V3021 has no busy states and there is no danger of
a clock update while accessing. Supply current is typically 800
nA at V
DD
= 3.0 V. Battery operation is supported by complete
functionality down to 2.0 V. The oscillator stability is typically 0.3
ppm/V.
XI
XO
CS
V
SS
CS
RD
WR
RAM
Fig. 1
Pin Assignment
DIP8 / SO8
Applications
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Utility meters
Battery operated and portable equipment
Consumer electronics
White/brown goods
Pay phones
Cash registers
Personal computers
Programmable controller systems
Data loggers
Automotive electronics
V
DD
V3021
WR
RD
I/O
Fig. 2
1

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