Data output circuit
AssigneeHynix Semiconductor Inc.
InventorsWon Sub SONG, Jong Tai Park
Life of this patent
Estimating the term…
Abstract
A data output circuit includes a main driver including a pull-up driver, coupled between a power supply terminal and a node coupled to the pad and a pull-down driver coupled between the node and a ground terminal, an impedance controller configured to control an output impedance at the node by sensing a voltage at the node and to generate pull-up control signals and pull-down control signals based on the sensed voltage, and a pre-driver configured to control driving strengths of the pull-up driver and the pull-down driver in response to the pull-up control signals, the pull-down control signals, and data.
Claims14
A data output circuit, comprising:
- a main driver including a pull-up driver coupled between a power supply terminal and a node coupled to the pad and a pull-down driver coupled between the node and a ground terminal;
- an impedance controller configured to control an output impedance at the node by sensing a voltage at the node and to generate pull-up control signals and pull-down control signals based on the sensed voltage;
- and
- a pre-driver configured to control driving strengths of the pull-up driver and the pull-down driver in response to the pull-up control signals, the pull-down control signals, and data.
A data output circuit, comprising:
- a pull-up driving circuit coupled between a pad and a power supply terminal and configured to control a pull-up driving strength of the pull-up driving circuit in response to pull-up driving control signals;
- a pull-down driving circuit coupled between the pad and a ground terminal and configured to control a pull-down driving strength of the pull-down driving circuit in response to pull-down driving control signals;
- a first signal generating circuit configured to generate pull-up enable signals and first driving control signals in response to a data signal and pull-up control signals;
- a second signal generating circuit configured to generate pull-down enable signals and second driving control signals in response to the data signal and pull-down control signals;
- a pull-up pre-driver group configured to output the pull-up driving control signals in response to the pull-up enable signals and the second driving control signals;
- and
- a pull-down pre-driver group configured to output the pull-down driving control signals in response to the pull-down enable signals and the first driving control signals.
Dependencies are inferred from the claim text.