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US 5,311,482 AGranted
Semiconductor integrated circuit
AssigneeHitachi, Ltd.
InventorsKatsumi Ogiue, Yukio Suzuki, Ikuro Masuda, Masanori Odaka, Hideaki Uchida
Life of this patent
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Abstract
In order to provide high speed and low power consumption, a semiconductor integrated circuit is constructed to utilize both CMOS elements and bipolar transistors. The bipolar transistors are used in the output portions to take advantage of their speed of operation to allow rapid charging and discharging of output lines. In the meantime, the principal operating portions of the circuit use CMOS elements of low power consumption. This arrangement is particularly advantageous in memory circuits.
Claims30
A semiconductor integrated circuit device, on a single semiconductor chip, comprising:
- a memory array including a plurality of memory cells comprised of MISFETs;
- and
- a decoder circuit coupled to receive address signals and for decoding the address signals to select at least one memory cell in the memory array, the decoder circuit including:
- a first decoder circuit serving as a predecoder and coupled to receive the address signals at inputs thereof, and including means for providing decoded signals at outputs thereof, the first decoder circuit being provided on the semiconductor chip so as to be separated from the memory array by a predetermined spacing, the first decoder circuit including an output stage for providing the decoded signals, and
- a second decoder circuit coupled by signal lines to the output stage of the first decoder circuit to receive the decoded signals at inputs thereof, and including means for providing output signals to the memory array, the second decoder circuit being provided on the semiconductor chip so as to be closer to the memory array than said first decoder circuit is,
- wherein said output stage of said first decoder circuit is comprised of bipolar output transistors to permit rapid charging and discharging of stray capacitance at the output of said first decoder caused by said signal lines between the output stage of the first decoder circuit and the inputs of the second decoder circuit, so that said decoder circuit can operate at high speed.
3 more elements
A semiconductor integrated memory circuit device, on a single semiconductor chip, comprising:
- a memory array including a plurality of memory cells comprised of MISFETs, a plurality of word lines and a plurality of pairs of data lines coupled to the plurality of memory cells so that each memory cell is coupled to one word line and to one pair of data lines;
- and
- a decoder circuit coupled to receive address signals and including means for decoding the address signals to select at least one memory cell in the memory array by selecting at least one word line and at least one pair of data lines, the decoder circuit including:
- a first decoder circuit serving as a predecoder and coupled to receive the address signals at inputs thereof, and including means for providing decoded signals at outputs thereof, the first decoder circuit including an output stage for providing the decoded signals, the first decoder circuit being arranged on the semiconductor chip so as to be separated from the memory array by a predetermined spacing, and
- a second decoder circuit coupled by signal lines to the output stage of the first decoder circuit to receive the decoded signals at inputs thereof, and including means for providing output signals, the second decoder circuit being arranged on the semiconductor chip so as to be closer to the memory array than said fist decoder circuit is
- wherein said output stage of said first decoder circuit is comprised of bipolar output transistors to permit rapid charging and discharging of stray capacitance at the output of said first decoder caused by said signal lines between the output stage of the decoder circuit and the inputs of the second decoder circuit, so that said first decoder circuit can operate at high speed.
3 more elements
A semiconductor integrated memory circuit device, on a single semiconductor chip, comprising:
- a memory array including a plurality of memory cells comprised of MISFETs, a plurality of word lines and a plurality of pairs of data lines coupled to the plurality of memory cells so that one memory cell is coupled to one word line and to one pair of data lines;
- an address buffer circuit coupled to receive address signals and for providing internal address signals;
- and
- a decoder circuit coupled to receive the internal address signals and for decoding the internal address signals to select at least one memory cell in the memory array by selecting at least one word line and at least one pair of data lines, the decoder circuit including:
- a first decoder circuit serving as a predecoder and coupled to receive the address signals at inputs thereof and for providing output signals at outputs thereof, the first decoder circuit including an output stage for providing the output signals, respectively,
- a second decoder circuit coupled to receive the output signals of the first decoder circuit at inputs thereof and for providing decode output signals at outputs thereof, the outputs of the second decoder circuit being coupled to the word lines, respectively, and
- a plurality of signal lines coupled between the outputs of the first decoder circuit and the inputs of the second decoder circuit, respectively, and for delivering the output signals of the first decoder circuit to the inputs of the second decoder circuit, the plurality of signal lines being arranged over long distances on the single semiconductor chip,
- wherein said output stage of said first decoder circuit is comprised of bipolar output transistors to permit rapid charging and discharging of stray capacitance at the output of said first decoder caused by said signal lines between the output stage of the first decoder circuit and the inputs of the second decoder circuit so that said decoder circuit can operate at high speed.
5 more elements
Dependencies are inferred from the claim text.