V30208S Datasheet PDF - ETC
| Part Number | V30208S | |
| Description | Ultra Low Power 1-Bit 32 kHz RTC | |
| Manufacturers | ETC | |
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R
EM MICROELECTRONIC-MARIN SA
Ultra Low Power 1-Bit 32 kHz RTC
V3020
Features
n Supply current typically 390 nA at 3 V
n 50 ns access time with 50 pF load capacitance
n Fully operational from 1.2 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 On request extended temperature range, -40 to +125 oC
n Pin compatible with the V3021
n TSSO8 and SO8 packages
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 VDD = 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.
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 systems
Typical Operating Configuration
CPU
Address
Decoder
CS
RD XI
V3020
WR XO
I/O
RAM
CS
RD
WR
Pin Assignment
S08
XI
XO
V3020
CS
VSS
Fig. 1
VDD
WR
RD
I/O
TSSO8
WR
VDD
XI
XO
V3020
RD
I/O
VSS
CS
Fig. 2
1
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R
Typical Frequency on I/O Pin
V3020
DF
Fo
[ppm]
+80
Address 10 hex = 00 hex
s/day
+3
Quartz with 8.2 pF load capacitance
+30 +2
-20 +1
-70 0
-120 -1
-170
-50 -30 -10 +10 30
50 70
TA [OC]
Typical drift for ideal 32'768 Hz quartz
90
-2
0 3 6 9 12 15
External trimming capacitor between XO and VSS [pF]
Note : The trimming capacitor value must not exceed 15 pF.
Greater values may disturb the oscillator function.
Fig. 5
Quartz Characteristics
DF
Fo
[ppm]
-100
-200
-300
-400
TO - 100
DF
Fo
=-0.038
ppm
OC2
(T
-
TO)2
±10%
DF/Fo = the ratio of the change in frequency to the nominal value
expressed in ppm (It can be thought of as the frequency
deviation at any temperature.)
T = the temperature of interest in oC
TO = the turnover temperature (25 ± 5 oC)
TO - 50 TO TO+50
Temperature [OC]
TO+100
T [OC]
To determine the clock error (accuracy) at a given temperature, add
the frequency tolerance at 25OC to the value obtained from the
formula above.
Fig. 6
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for V30208S electronic component. |
| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ V30208S.PDF Datasheet ] | |
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