PURPOSE: To eliminate time and labor to assemble a ROM in which a bit pattern is written with address correspondence and an address control counter separately by unifying them in one single package.

CONSTITUTION: The ROM 10 in which the bit pattern is written with the address correspondence and the address control counter 9 which outputs sequential pattern data by designating the address of the ROM at every input of an external clock from a pin 12 are unified in the package 9. Thereby, it is possible to easily output an arbitrary sequential pattern only by inputting a clock and a reset signal from the outside, and also, to make an output pattern into large capacity as simplifying and facilitating cascade connection when it is used.