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Supplemental ICs: TM-4356P

 
Toshiba TM-4356P Transistor array
ID: TM-4356P Used in: Toshiba BC-0808B
Type: Transistor array, used as a grid driver for VFDs.
Maker: Toshiba
Typical date range: 1973-4
Package: 20 pin DIL 0.3" width black plastic
Date coding system: Two digit {Year} - {month letter}
Notes:

The TM 4356P is an array of nine basic transistor that can be used to switch and drive the grid of a vacuum fluorescent display in multiplexed digit mode.  A typical configuration for a calculator display is shown below.

 

When an input at the "IN" terminal is negative, a transistor "Tr" is in its on state.  As a result, the potential at the output terminal "OUT" of the transistor is kept at that of GND, and the display tubes are lighted.  When the "IN" terminal is positive, the Tr is off and the potential at the "OUT" is maintained at -33.5V, as a result the display tubes are off.