CD74HC670M集成电路（IC）的移位寄存器规格书PDF中文资料

CD74HC670M属于集成电路（IC）的移位寄存器。由美国德州仪器公司制造生产的CD74HC670M移位寄存器移位寄存器是低级逻辑器件，通常用于在串行和并行方式之间转换数字逻辑信号形式的数据，或在数字字内移动数据位的位置。移位寄存器通常使用集成到一个设备中的一组触发器来实现，常用于集成度更高的逻辑器件，但仍可用于 I/O 扩展等应用，在这些应用中离散形式的函数可能会非常有用。

Features

• 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 = 25oC

• Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55oC to 125oC

• 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

Description

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.