Electrical pulse counters – pulse dividers – or shift registers: c – Shift register – Shift direction control
Patent
1993-03-04
1994-11-08
Callahan, Timothy P.
Electrical pulse counters, pulse dividers, or shift registers: c
Shift register
Shift direction control
377 73, 377 76, 377 77, G11C 1928
Patent
active
053634241
ABSTRACT:
A driver circuit comprising an output level selection circuit and a shift register is disclosed. The output level selection circuit has driving terminals, potential level input terminals and data input terminals, and an output signal having one of the different potential levels from the driving terminals in response to the data signals. The shift register includes an input terminal, an output terminal, a control terminal, a control circuit, a first shift circuit, and a second shift circuit. The first shift circuit has an input coupled to the input terminal of the shift register and the control circuit, and an output coupled to the control circuit. The second shift circuit has an input coupled to the control circuit and an output coupled to the output terminal of the shift register. The control circuit couples the input terminal to the input of the first shift stage circuit and also couples the output of the first shift stage circuit and the input of the second shift stage circuit when a control signal is in a first state. Similarly, the control circuit couples the input terminal to the input of the second shift circuit when the control signal is in a second state.
REFERENCES:
patent: 4850000 (1989-07-01), Dias
patent: 4852130 (1989-07-01), Draxelmayr
patent: 4951301 (1990-08-01), Zulian
patent: 5017914 (1991-05-01), Uchida et al.
patent: 5164970 (1992-11-01), Shin et al.
Callahan Timothy P.
Nu Ton My-Trang
OKI Electric Industry Co., Ltd.
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