NXP 74HC670D,652 移位寄存器, HC系列, 高速CMOS, 通用, 1元件, SOIC, 16 引脚, 2 V, 6 V
The 74HC670D is a 4 x 4 high-speed Si-gate CMOS Register File pin compatible with low power Schottky TTL LSTTL. It is a 16-bit 3-state register file organized as 4 words of 4 bits each. Separated read and write address inputs RA, RB and WA, WB and enable inputs RE\ and WE\\ are available, permitting simultaneous writing into one word location and reading from another location. The 4-bit word to be stored is presented to four data inputs D0 to D3. The WA and WB inputs determine the location of the stored word. When the WE\ input is low, the data is entered into the addressed location. The addressed location remains transparent to the data while the WE\ input is low. Data supplied at the inputs will be read out in true form from the 3-state outputs Q0 to Q3. Dn and Wn inputs are inhibited when WE\ is high. Direct acquisition of data stored in any of the four registers is made possible by individual read address inputs.