CD74HC670 High Speed CMOS Logic 4-by-4 Register IC
16-bit register file with simultaneous read and write capabilities
- DC Supply Voltage: -0.5V to 7V
- DC Input Diode Current: +20 mA
- DC Output Diode Current: +20 mA
- DC Drain Current, per Output: +35 mA
- DC Output Source or Sink Current per Output Pin: +25 mA
- DC VCC or Ground Current: +50 mA
- Temperature Range: -55°C to 125°C
- Package Includes: 1 X CD74HC670 High Speed CMOS Logic 4-by-4 Register IC (74670 IC) DIP-16 Package
Top 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
The CD74HC670 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.
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.
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