Datasheet

Write Cycle ( Attribute Memory )
Symbol Parameter Min. Max. Unit Test Condition
tCW Write Cycle Time 1 ms
tAS Address Setup Time 30 ns
tAH Address Hold Time 50 ns
tWP Write Pulse Width 120 ns
tCS Card Enable Time to WE* 15 ns
tCH Card Enable Hold Time from WE* High 0 ns
tDS Data Setup Time 70 ns
tDH Data Hold Time 30 ns
tOES OE* Setup Time 30 ns
tOEH OE* Hold Time 30 ns
tDB Delay from WE* high to BUSY* Asserted 50 ns
Battery Voltage Detection
BVD1*/BVD2* pins are used to monitor the voltage of the main battery which should be
maintained at 2.65V or greater for data retention. The following table described the main
battery status by reading the signals on
BVD1*/BVD2* pins.
BVD1* BVD2* Main Battery Comments
H H VBAT ≥ 2.65V Data retention is OK. Battery is operational
H L 2.37V < VBAT < 2.65V Data retention is OK. But battery should be replaced.
L L VBAT < 2.37V Data integrity is not guaranteed.
Battery must be replaced.
Note : if the main battery is removed , BVD1* and BVD2* pins will not function
Main Battery Specifications
 3V Lithium battery
 Recommended parts .
RAYOVAC BR2325
TOSHIBA CR2025
PANASONIC BR2325
PANASONIC CR2025
Approximate Battery Life Time Under Battery Back-up Only
( Ta=25°C, Humidity=60% R.H. )
Product Part No. Battery Life Product Part No. Battery Life
SC001M-15C-00-A002K-8bit 3,5 years SC001M-15I-00-A002K-8bit 3,0 years
SC002M-15C-00-A002K-8bit 1,5 years SC002M-15I-00-A002K-8bit 1,0 years
SC004M-15C-00-A002K-8bit 1,0 years SC004M-15I-00-A002K-8bit 0,5 years
SC008M-15C-00-A002K-8bit 0,5 years SC006M-15I-00-A002K-8bit 0,5 years