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HD74HC670 - 4-by-4 Register

Description

The HD74HC670, 16-bit register file is organized as 4 words of 4 bits each and separate on-chip decoding is provided for addressing the four word locations to either write-in or retrieve data.

This permits simultaneous writing into one location and reading from another word location.

Features

  • High Speed Operation: tpd (Read Select to Q) = 21 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) HD74HC670 Function Table Write Inputs WB L L H H X WA L H L H X GW L L L L H Word 0 Q=D Q0 Q0 Q0 Q0 1 Q0 Q=D Q0 Q0 Q0 2 Q0 Q0 Q=D Q0 Q0 3 Q0 Q0 Q0 Q=D Q0 Read Inputs RB L L H H X RA L H L H X GR L L.

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Full PDF Text Transcription

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HD74HC670 4-by-4 Register File (with 3-state outputs) Description The HD74HC670, 16-bit register file is organized as 4 words of 4 bits each and separate on-chip decoding is provided for addressing the four word locations to either write-in or retrieve data. This permits simultaneous writing into one location and reading from another word location. Four data inputs are available which are used to supply the 4-bit word to be stored. Location of the word is determined by the write-address inputs A and B in conjunction with a write-enable signal. Data applied at the inputs should be in its true form. That is, if a high-level signal is desired from the output, a high-level is applied at the data input for that particular bit location.
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