EPPOM INTEGRATED CIRCUIT DEVICE

摘要

PURPOSE:To form an EPROM integrated circuit device capable of obtaing four states with only the combinations of inputs of high power source terminal and a write control input terminal by providing a state control circuit which generates the four states: a write state, a standby state, a verify state, and a read state, from the output of a write voltage detection circuit and a write control input. CONSTITUTION:The titled device is constituted with a write voltage detection circuit VDET1, a state control circuit STSC2, an EPROM element circuit MCEL3, an address decoder circuit ADDEC4, a sense amplifier circuit SENS5, and a write control circuit WCTR6. And the device is equipped with a high power source terminal Vpp connected to the VDET1, a write control input terminal WCT connected to the STSC2, plural address input terminals ADDIN, plural data input/output terminals DAIO, a power source terminal Vcc, and an earth terminal GND. The STSC2 is constituted with a decoder circuit, and '0', for example, is outputted in a normal time from a detection signal line VH, and '1' as a detection signal, and when '0' or '1' is supplied to a write control line, outputs shown in table 1 are obtained at signal lines W, VF, and STB, corresponding to the write state, the verify state, and the standby state.