Semiconductor device having input/output line drive circuit and semiconductor system including the same
A semiconductor system includes a first semiconductor device and a second semiconductor device. The first semiconductor device outputs a command/address signal. The second semiconductor device extracts an active signal, a pre-charge signal, and addresses from the command/address signal, performs an active operation on a memory cell corresponding to the addresses, and performs a refresh operation on the memory cell corresponding to counting signals generated by counting a number of pulses in a refresh signal.
1. An input/output line drive circuit comprising:
an amplification unit suitable for sensing and amplifying a voltage difference between a bit line and an inversion bit line coupled to a memory cell;
a first coupling unit suitable for coupling the bit line to a segment line in response to a column select signal and an enable signal; and
a second coupling unit suitable for coupling the inversion bit line to an inversion segment line in response to the column select signal and the enable signal,
wherein:
the first coupling unit decouples the bit line from the segment line if the enable signal is disabled during the refresh operation; and
the second coupling unit decouples the inversion bit line from the inversion segment line if the enable signal is disabled during the refresh operation.
2. The circuit of claim 1 , wherein the first coupling unit includes:
a first switch coupled between the segment line and a first node and suitable for being turned on in response to the column select signal; and
a second switch coupled between the first node and the bit line and suitable for being turned on in response to the enable signal.
3. The circuit of claim 1 , wherein the second coupling unit includes:
a third switch coupled between the inversion segment line and a second node and suitable for being turned on in response to the column select signal; and
a fourth switch coupled between the second node and the inversion bit line and suitable for being turned on in response to the enable signal.
4. The circuit of claim 1 , further comprising:
a switching signal generating unit suitable for generating a switching signal and the column select signal by decoding addresses input from an external device or counting signals generated by counting a number of pulses in a clock signal; and
an enable signal generating unit suitable for generating the enable signal by decoding the counting signals.
5. The circuit of claim 4 , further comprising:
a switching unit suitable for coupling the segment line and the inversion segment line to a pair of I/O lines in response to the switching signal.