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Numéro de référence | V3021 | ||
Description | Ultra Low Power 1-Bit 32 kHz RTC | ||
Fabricant | ETC | ||
Logo | |||
1 Page
R
EM MICROELECTRONIC-MARIN SA
V3021
Ultra Low Power 1-Bit 32 kHz RTC
Features
n Supply current typically 800 nA at 3 V
n 50 ns access time with 50 pF load capacitance
n Fully operational from 2.0 V to 5.5 V
n No busy states or danger of a clock update while
accessing
n Serial communication on one line of a standard parallel
data bus or over a conventional 3 wire serial interface
n Interface compatible with both Intel and Motorola
n Seconds, minutes, hours, day of month, month, year, week
day and week number in BCD format
n Leap year and week number correction
n Time set lock mode to prevent unauthorized setting of the
current time or date
n Oscillator stability 0.3 ppm / volt
n No external capacitor needed
n Frequency measurement and test modes
n Temperature range - 40 to +85 oC
n Packages DIP8 and SO8
Typical Operating Configuration
CPU
Address
Decoder
XI
CS
RD XO
WR
V3021
I/O
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 VDD = 3.0 V. Battery operation is supported by complete
functionality down to 2.0 V. The oscillator stability is typically 0.3
ppm/V.
Pin Assignment
DIP8 / SO8
RAM
CS
RD
WR
Applications
n Utility meters
n Battery operated and portable equipment
n Consumer electronics
n White/brown goods
n Pay phones
n Cash registers
n Personal computers
n Programmable controller systems
n Data loggers
n Automotive electronics
XI VDD
XO WR
V3021
CS RD
VSS I/O
1
Fig. 1
Fig. 2
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Pages | Pages 12 | ||
Télécharger | [ V3021 ] |
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