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| | | APPLICATION NOTE «H» | | |
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| | | VACUUM FLUORESCENT DISPLAY | | |
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| | | [UW Dg HÜ HD UM«™ DSM | | |
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| | | Vacuum Fluorescent Displays (V.F.D.} can be driven directly by 4 ~ 8 bitC.P.U. (micro-computer), comprising p-channel open drain type MOS high breakdown voltage output stages. However, sometimes it is necessary to use driver circuits as the interface between V.F.D. and Trior CMOS level input signal. Such driver circuits can be composed of discrete semiconductor devices, but it is more convenient to use several bipolar or CMOS type driver Integrated Circuits which contains 6~8 circuits per package of 16™"18 pin DIP. Reference Table I for the various driver IC's available on the market. Shown below are examples of typical drive circuits and input/output waveforms. | | |
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| | | Examples of Typical Drive Circuits and Input/Output Waveforms | | |
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| | | (1) ! Negative power supply use | | (2) Positive power supply use | | |
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| | | a. Internal pulldown resistor type | | a. Internal pulldown resistor type Vdisp | | |
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| | | GND, | | |
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| | | GNO | | |
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| | | 1/S MSL915RS 1/8MSL916AS -VOiSP 1/8 MSL919RS 1/8 HA16619P | | |
| | | (V CUSPID | | |
| | | GNDo | | |
| | | VÏGND | | |
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| | | 1/8 MSL912RS 1/8 HA16617P | | |
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| | | b. Open drain type | | b. Open emitter type | | |
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| | | GND | | |
| | | Vdisp | | |
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| | | GND J~\_ ■ -5V | | |
| | | GND—I | | |
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| | | -vdisp | | |
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| | | GNO | | |
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| | | 1/7 TC5066BP | | |
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| | | -VDISP |V DISPAIVI | | |
| | | GND | | V^GND | | |
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| | | 1/8 MSL916RS | | |
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