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V30208TSS Datasheet

  • V30208TSS

  • Ultra Low Power 1-Bit 32 kHz RTC

  • 14頁

  • ETC

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R
EM MICROELECTRONIC-MARIN SA
V3020
Ultra Low Power 1-Bit 32 kHz RTC
Features
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Supply current typically 390 nA at 3 V
50 ns access time with 50 pF load capacitance
Fully operational from 1.2 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
On request extended temperature range, -40 to +125
o
C
Pin compatible with the V3021
TSSO8 and SO8 packages
Typical Operating Configuration
WR or R/W
RD or DS
CPU
Address
Decoder
Address Bus
CS
RD
WR
I/O
XI
Data Bus
V3020
XO
RAM
Description
The V3020 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 V3020 has no busy states and there is no danger of
a clock update while accessing. Supply current is typically 390
nA at V
DD
= 3.0 V. Battery operati on is supported by complete
functionality down to 1.2 V. The oscillator s tability is typically 0.3
ppm/V.
CS
RD
WR
Fig. 1
Pin Assignment
S08
XI
XO
V
DD
WR
V3020
CS
V
SS
RD
I/O
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 systems
TSSO8
WR
V
DD
XI
XO
V3020
RD
I/O
V
SS
CS
Fig. 2
1

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