le25lb643 Sanyo Semiconductor Corporation, le25lb643 Datasheet - Page 12

• Manufacturer Part Number: le25lb643
• Description: Serial Eeprom
• Manufacturer: Sanyo Semiconductor Corporation

7. Hardware Data Protection
8. Software Data Protection
9. Power-on
10. Decoupling Capacitor
In order to protect against unintentional writing at power-on, the LE25LB643 incorporates a power-on reset function.
This product eliminates the possibility of unintentional operations by not recognizing commands under the following
conditions.
• When a write command is input and the rising CS edge timing is not in a bus cycle (8CLK units of SCK).
• When the write data is not in 1-byte increments.
• When the status register write command is input for 2bus cycles or more.
In order to protect against unintentional writing, CS must be kept at V DD at power-on. After power-on, the supply
voltage has stabilized at 1.8V or higher, wait for 10μs (t PU _READ) before inputting the command to start a read
operation. Similarly, wait for 10ms (t PU _WRITE) after the supply voltage has stabilized at 1.8V or higher before
inputting the command to start a write operation.
A0.1μF ceramic capacitor must be provided to each device and connected between V DD and V SS in order to ensure
that the device will operate stably.
LE25LB643
No.NA1342-12/14