Semiconductor memory device employing clamp for preventing latch up
First Claim
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1. A semiconductor memory device, comprising:
- a pair of data lines;
a first driving unit comprising a first CMOS transistor, configured to drive an input signal to one of the pair of data lines;
a second driving unit comprising a second CMOS transistor, configured to drive an input signal to the other data line;
a precharging/equalizing unit comprising at least two MOS transistors, configured to precharge and equalize the pair of data lines;
a first clamping unit configured to supply a source voltage of the first CMOS transistor in response to a bulk bias voltage of the first CMOS transistor;
a second clamping unit configured to supply a source voltage of the second CMOS transistor in response to a bulk bias voltage of the second CMOS transistor; and
a third clamping unit configured to supply a source voltage of the two MOS transistors in response to a bulk bias voltage of the two MOS transistor.
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Abstract
A semiconductor memory device employs a clamp for preventing latch up. For the purpose, the semiconductor memory device includes a precharging/equalizing unit for precharging and equalizing a pair of bit lines, and a control signal generating unit for producing a control signal which controls enable and disable of the precharging/equalizing unit, wherein the control signal generating unit includes a clamping unit to clamp its source voltage to a voltage level lower than that of its bulk bias.
27 Citations
10 Claims
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1. A semiconductor memory device, comprising:
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a pair of data lines; a first driving unit comprising a first CMOS transistor, configured to drive an input signal to one of the pair of data lines; a second driving unit comprising a second CMOS transistor, configured to drive an input signal to the other data line; a precharging/equalizing unit comprising at least two MOS transistors, configured to precharge and equalize the pair of data lines; a first clamping unit configured to supply a source voltage of the first CMOS transistor in response to a bulk bias voltage of the first CMOS transistor; a second clamping unit configured to supply a source voltage of the second CMOS transistor in response to a bulk bias voltage of the second CMOS transistor; and a third clamping unit configured to supply a source voltage of the two MOS transistors in response to a bulk bias voltage of the two MOS transistor. - View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor memory device, comprising:
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a CMOS transistor configured to includes a PMOS transistor and an NMOS transistor; and a clamping unit configured to supply a source voltage of the CMOS transistor in response to a bulk bias voltage of the CMOS transistor, wherein the PMOS transistor and the NMOS transistor have gates commonly forming an input node and drains commonly forming an output node of the CMOS transistor, the PMOS transistor uses a boosted voltage as a bulk bias, and the NMOS transistor uses a reduced voltage as a bulk bias. - View Dependent Claims (7, 8, 9, 10)
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Specification