AN ELECTRICALLY ERASABLE PROGRAMMBLE ROM

摘要

PURPOSE: An EEPROM(Electrically Erasable and Programmable Read Only Memory) is provided to be programmable without additional program power supply part comprised in the external. CONSTITUTION: The EEPROM(30) is programmable when a normal operation is performed by receiving a power supply voltage(Vcc) and a program voltage(Vpp) for programming and a write enable signal are inputted, and includes: a register(37) which is located in a region of a memory region and stores data(D0) to set a program enable/disable state by being selected when a corresponding address signal is inputted; and a program state set part(39) setting the program enable/disable state by receiving an output of the register and the write enable signal. The register receives the data(D0) and is a flip flop for 1 bit latch with the write enable signal as a clock signal, and the program state set part comprises an OR gate receiving an output signal of the flip flop and receives the write enable signal. The program voltage is the same voltage(5V) as the power supply voltage or is a voltage(12V) higher than the power supply voltage.