Static information storage and retrieval – Read only systems
Patent
1985-10-17
1988-03-29
Moffitt, James W.
Static information storage and retrieval
Read only systems
365 96, 365103, 307465, G11C 1706
Patent
active
047348852
ABSTRACT:
A programmable matrix has improved programming circuitry which allows the matrix to be programmed without raising the output terminals or power supply to higher than normal voltage levels. The circuitry includes a bidirectional output buffer and a multi-purpose input pin. The output buffer is provided with a control input and at least one buffer output. A switching device in the buffer provides a path to ground for programming current when a programming enable signal is applied to the control input and a concurrent operating level voltage pulse is applied to a selected buffer output. Programming current may be supplied via a dedicated input pin, but is preferably supplied via the multi-purpose input pin. A higher than normal operating voltage signal applied to the multi-purpose input pin acts to produce the programming enable signal which is subsequently applied to the buffer control input. This arrangement makes it unnecessary to elevate the voltage on the power supply input or the buffer outputs for programming purposes. The buffer outputs are isolated from programming currents and voltages by a second switching device in the bidirectional output buffer. The programming arrangement may be used with PROMs, PLAs and other programmable matrices.
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Bowler Alyssa H.
Harris Corporation
Moffitt James W.
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