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FM33256B-G Arkusz danych(PDF) 9 Page - Ramtron International Corporation

Numer części FM33256B-G
Szczegółowy opis  3V Integrated Processor Companion with F-RAM
Download  29 Pages
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Producent  RAMTRON [Ramtron International Corporation]
Strona internetowa  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM33256B-G Arkusz danych(HTML) 9 Page - Ramtron International Corporation

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FM33256B SPI Companion w/ FRAM
This product conforms to specifications per the terms of the Ramtron
Ramtron International Corporation
standard warranty. The product has completed Ramtron’s internal
1850 Ramtron Drive, Colorado Springs, CO 80921
qualification testing and has reached production status.
(800) 545-FRAM, (719) 481-7000
www.ramtron.com
Rev. 3.0
Aug. 2012
Page 9 of 28
Figure 9. Real-time Clock Core Block Diagram
Backup Power
The real-time clock/calendar is intended to be
permanently powered. When the primary system
power fails, the voltage on the VDD pin will drop.
When VDD is less 2.5V, the RTC (and event counters)
will switch to the backup power supply on VBAK. The
clock operates at extremely low current in order to
maximize battery or capacitor life. However, an
advantage of combining a clock function with FRAM
memory is that data is not lost regardless of the
backup power source.
The IBAK current varies with temperature and voltage
(see DC parametric table). Figure 10 shows IBAK as a
function of VBAK. These curves are useful for
calculating backup time when a capacitor is used as
the VBAK source.
The minimum VBAK voltage varies linearly with
temperature. The user can expect the minimum VBAK
voltage to be 1.23V at +85°C and 1.90V at -40°C.
The tested limit is 1.55V at +25°C.
Figure 10. IBAK vs. VBAK Voltage
Figure 11. VBAK (min.) vs Temperature
Note: The minimum VBAK voltage has been
characterized at -40°C and +85°C but is not
100% tested.
32.768 kHz
crystal
Oscillator
Clock
Divider
Update
Logic
512 Hz or
SW out
W
R
Seconds
7 bits
Minutes
7 bits
Hours
6 bits
Date
6 bits
Months
5 bits
Years
8 bits
CF
Days
3 bits
User Registers
1 Hz
/OSCEN


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