CD74HC670 - 高速 CMOS 逻辑 4 x 4 寄存器文件

CD74HC670是TI德州仪器公司的一款其它锁存器产品，CD74HC670是高速 CMOS 逻辑 4 x 4 寄存器文件，本站介绍了CD74HC670的封装应用图解、特点和优点、功能等，并给出了与CD74HC670相关的TI元器件型号供参考。

CD74HC670 - 高速 CMOS 逻辑 4 x 4 寄存器文件 - 其它锁存器 - 触发器/锁存器/寄存器 - 德州仪器

产品描述

The ’HC670 and CD74HCT670 are 16-bit register files organized as 4 words x 4 bits each. Read and write address and enable inputs allow simultaneous writing into one location while reading another. Four data inputs are provided to store the 4-bit word. The write address inputs (WA0 and WA1) determine the location of the stored word in the register. When write enable (WE\) is low the word is entered into the address location and it remains transparent to the data. The outputs will reflect the true form of the input data. When (WE\) is high data and address inputs are inhibited. Data acquisition from the four registers is made possible by the read address inputs (RA1 and RA0). The addressed word appears at the output when the read enable (RE\) is low. The output is in the high impedance state when the (RE\) is high. Outputs can be tied together to increase the word capacity to 512 x 4 bits.

产品特性

Simultaneous and Independent Read and Write Operations
Expandable to 512 Words of n-Bits
Three-State Outputs
Organized as 4 Words x 4 Bits Wide
Buffered Inputs
Typical Read Time = 16ns for ’HC670 VCC = 5V, CL = 15pF, TA = 25°C
Fanout (Over Temperature Range)
- Standard Outputs...10 LSTTL Loads
- Bus Driver Outputs...15 LSTTL Loads
Wide Operating Temperature Range... –55°C to 125°C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH

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