An output apparatus for receiving code data from a data source of a host computer and developing it into pattern data and outputting the data. The apparatus includes a pattern generator to generate pattern data; a memory to store the pattern data generated by the pattern generator and obtained in response to an output operation as a font cache; and a controller for controlling the memory such that when an amount of available memory is less than an amount sufficient to store data which is newly i...

An output circuit includes: a power supply unit; an output MIS transistor connected to the power supply unit; a reference MIS transistor that is connected to the power supply unit and is invariably in ON state; a current supply unit for generating a reference voltage Vref; an output terminal through which a current is supplied to a load circuit; a comparator; a logic circuit; and a control circuit for carrying out the ON/OFF control of the output MIS transistor. Comparison is made between the re...

Since voltages of two input terminals of an output unit having an online download function are decided by voltages which are not correlative to each other, a value of an incoming current on the start-up becomes large. The present invention solves the problem of turning-on of a parasitic transistor due to a transitional minus potential even when the voltage of the output unit on a stationary state is set to 0 V in order to reduce the incoming current. In this invention, a switch is turned on and ...

An output buffer includes a p-channel transistor, and first and second n-channel transistors. The p-channel transistor has one of a source and drain which is connected to power supply and the other which is connected to an output node connected to an output terminal. The first n-channel transistor has one of a source and drain which is grounded and the other which is connected to the output node. The second n-channel transistor is series-connected to the p-channel transistor between a power supp...

An output buffer (200) having a protection circuit (228, 230, 232) which adjusts control of an output drive circuit (224,226) in response to external voltages on the output pin (202). When the output pin is in a tri-state condition and receives an external voltage which is outside a predetermined voltage range, the protection circuit adjusts the voltage on the control gate of a transistor (224) in the output drive circuit. The protection circuit maintains the voltage across the transistor within...

In an output circuit, there are provided a first transistor connected to an output terminal and a first resistor element connected to the first transistor. A second transistor is connected in cascade to the first transistor. A second resistor element is connected between the second transistor and the ground. An emitter follower having a level shift function is connected to the first and second transistors. There are also provided an input circuit which inputs a first input signal and a second in...

An output buffer with a switchable output impedance designed for driving a terminated signal line. The buffer includes a drive circuit, and a means for switching the output impedance of the drive circuit between a first, relatively low output impedance when the output buffer is operated in a `normal` mode, and a second output impedance which is greater than the first output impedance when operated in a `standby` mode. By increasing the drive circuit's output impedance while in `standby` mode, po...

There is provided an output apparatus in which an output resolution can be changed and a memory medium including character information of printing dot patterns is detachable. The memory medium has holding means for storing and holding output density information of dot patterns of characters stored in the memory medium. The apparatus comprises in one embodiment: reading means for reading out the output density information from the memory medium; and changing means for changing the output resoluti...

An output stage, comprising a first transistor operable to pull a voltage at an output node towards a first voltage, and a rechargeable energy store having a potential difference between first and second terminals wherein the rechargeable energy store is arranged to be controllably connected between the output node and a second voltage supply such that the voltage at the output node can be driven to a voltage outside of a range defined between the first and second voltages.

An IGFET push-pull driver circuit includes an output stage having pull-up and pull-down IGFETs for driving an output node. An inverter stage drives the gate of the pull-up IGFET. A current sensing IGFET biased to represent a resistance is coupled between the pull-up IGFET and the output node to provide a voltage drop which is proportional to the current flowing through the pull-up IGFET. A regulating IGFET with its channel coupled between the gate of the pull-up IGFET and the output node and wit...