Data output driver

A data pull-up driver which increases its output terminal driving strength linearly in proportion to a number of activated N numbers of pull-up control signals, comprising:

• N-L numbers of first unit pull-up drivers turned on by N-L numbers of pull-up control signals respectively for pull-up driving an output terminal in response to a first pull-up data signal wherein each of the first unit pull-up drivers includes a first pull-up PMOS transistor turned on by one of the pull-up control signals to transfer a power supply voltage to the output terminal and a second pull-up PMOS transistor turned on by the first pull-up data signal or a second pull-up data signal to transfer the power supply voltage to the output terminal;
• L numbers of second unit pull-up drivers turned on by L numbers of pull-up control signals respectively for pull-up driving the output terminal in response to a second pull-up data signal;
• and
• N numbers of pull-up resistors connected between the output terminal and the N numbers of first and second unit pull-up drivers,
• wherein, the L numbers of pull-up control signals do not include any of the N-L numbers of pull-up control signals.

A data pull-down driver which increases its output terminal driving strength linearly in proportion to the number of activated N numbers of pull-down control signals, comprising:

• N-L numbers of first unit pull-down drivers turned on by N-L numbers of pull-down control signals respectively for pull-down driving the output terminal in response to a first pull-down data signal wherein each of the first unit pull-down drivers includes a first pull-down NMOS transistor turned on by one of the pull-down control signals to transfer a power supply voltage to the output terminal and a second pull-down NMOS transistor turned on by the first pull-down data signal or a second pull-down data signal to transfer the power supply voltage to the output terminal;
• L numbers of second unit pull-down drivers turned on by L numbers of pull-down control signals respectively for pull-down driving the output terminal in response to a second pull-down data signal;
• and
• N numbers of pull-down resistors connected between the output terminal and the N numbers of first and second unit pull-down drivers,
• wherein, the L numbers of pull-down control signals do not include any of the N-L numbers of pull-down control signals.

A data pull-up driver, for use in a semiconductor memory device, increases its output terminal driving strength linearly in proportion to the number of activated signals among first to seventh pull-up control signals, comprising:

• a first unit pull-up driver including a first pull-up PMOS transistor turned on by a first pull-up data signal to transfer a power supply voltage to the output terminal, a second pull-up PMOS transistor turned on by the first pull-up control signal to transfer the power supply voltage to the output terminal and a first resistor connected between the output terminal and the first and second pull-up PMOS transistors;
• a second unit pull-up driver including a third pull-up PMOS transistor turned on by the first pull-up data signal to transfer the power supply voltage to the output terminal, a fourth pull-up PMOS transistor turned on by the second pull-up control signal to transfer the power supply voltage to the output terminal and a second resistor connected between the output terminal and the third and fourth pull-up PMOS transistors;
• a third unit pull-up driver including a fifth pull-up PMOS transistor turned on by a second pull-up data signal to transfer the power supply voltage to the output terminal, a sixth pull-up PMOS transistor turned on by the third pull-up control signal to transfer the power supply voltage to the output terminal and a third resistor connected between the output terminal and the fifth and sixth pull-up PMOS transistors;
• a fourth unit pull-up driver including a seventh pull-up PMOS transistor turned on by the second pull-up data signal to transfer the power supply voltage to the output terminal, a eighth pull-up PMOS transistor turned on by the fourth pull-up control signal to transfer the power supply voltage to the output terminal and a fourth resistor connected between the output terminal and the seventh and eighth pull-up PMOS transistors;
• a fifth unit pull-up driver including a ninth pull-up PMOS transistor turned on by the second pull-up data signal to transfer the power supply voltage to the output terminal, a tenth pull-up PMOS transistor turned on by the fifth pull-up control signal to transfer the power supply voltage to the output terminal and a fifth resistor connected between the output terminal and the ninth and tenth pull-up PMOS transistors;
• a sixth unit pull-up driver including an eleventh pull-up PMOS transistor turned on by the second pull-up data signal to transfer the power supply voltage to the output terminal, a twelfth pull-up PMOS transistor turned on by the sixth pull-up control signal to transfer the power supply voltage to the output terminal and a sixth resistor connected between the output terminal and the eleventh and twelfth pull-up PMOS transistors;
• and
• a seventh unit pull-up driver including a thirteenth pull-up PMOS transistor turned on by the second pull-up data signal to transfer the power supply voltage to the output terminal, a fourteenth pull-up PMOS transistor turned on by the seventh pull-up control signal to transfer the power supply voltage to the output terminal and a seventh resistor connected between the output terminal and the thirteenth and fourteenth pull-up PMOS transistors.

A data pull-down driver, for use in a semiconductor memory device, increases its output terminal driving strength linearly in proportion to the number of activated signals among first to seventh pull-down control signals, comprising:

• a first unit pull-down driver including a first pull-down NMOS transistor turned on by a first pull-down data signal to transfer a power supply voltage to the output terminal, a second pull-down NMOS transistor turned on by the first pull-down control signal to transfer the power supply voltage to the output terminal and a first resistor connected between the output terminal and the first and second pull-down PMOS transistors;
• a second unit pull-down driver including a third pull-down NMOS transistor turned on by the first pull-down data signal to transfer the power supply voltage to the output terminal, a fourth pull-down NMOS transistor turned on by the second pull-down control signal to transfer the power supply voltage to the output terminal and a second resistor connected between the output terminal and the third and fourth pull-down NMOS transistors;
• a third unit pull-down driver including a fifth pull-down NMOS transistor turned on by a second pull-down data signal to transfer the power supply voltage to the output terminal, a sixth pull-down NMOS transistor turned on by the third pull-down control signal to transfer the power supply voltage to the output terminal and a third resistor connected between the output terminal and the fifth and sixth pull-down NMOS transistors;
• a fourth unit pull-down driver including a seventh pull-down NMOS transistor turned on by the second pull-down data signal to transfer the power supply voltage to the output terminal, a eighth pull-down NMOS transistor turned on by the fourth pull-down control signal to transfer the power supply voltage to the output terminal and a fourth resistor connected between the output terminal and the seventh and eighth pull-down NMOS transistors;
• a fifth unit pull-down driver including a ninth pull-down NMOS transistor turned on by the second pull-down data signal to transfer the power supply voltage to the output terminal, a tenth pull-up NMOS transistor turned on by the fifth pull-down control signal to transfer the power supply voltage to the output terminal and a fifth resistor connected between the output terminal and the ninth and tenth pull-down NMOS transistors;
• a sixth unit pull-down driver including an eleventh pull-down NMOS transistor turned on by the second pull-down data signal to transfer the power supply voltage to the output terminal, a twelfth pull-down NMOS transistor turned on by the sixth pull-down control signal to transfer the power supply voltage to the output terminal and a sixth resistor connected between the output terminal and the eleventh and twelfth pull-down NMOS transistors;
• and
• a seventh unit pull-down driver including a thirteenth pull-down NMOS transistor turned on by the second pull-down data signal to transfer the power supply voltage to the output terminal, a fourteenth pull-down NMOS transistor turned on by the seventh pull-down control signal to transfer the power supply voltage to the output terminal and a seventh resistor connected between the output terminal and the thirteenth and fourteenth pull-down NMOS transistors.