Abstract:
This specification describes a sense amplifier/bit driver circuit for a monolithic memory storage cell with a double ended output. The sense amplifier consists of two shunt feedback amplifiers connected differentially across the double ended output of the storage cell. There is a resistive connection between the outputs of the two shunt feedback amplifiers to make each input of the two shunt feedback amplifiers relatively insensitive to large changes at the other input. The bit driver for the circuit contains two current switch circuits for controlling the potential at each end of the double ended output of the storage cell. These current switch circuits are crosscoupled by a transistor which eliminates the need for inverting one of the control pulses to the bit driver.
Abstract:
This specification discloses a bipolar driver which will charge a capacitive load to substantially the potential supplied to the driver. The driver includes two transistors that couple the load to a source of potential. One transistor is connected in shunt with the load while the other transistor is connected in series with the load and the source of potential. The shunt-connected transistor is used to discharge the capacitive load while the serially connected transistor is used to charge the capacitive load with charge from the source of potential. To allow the capacitive load to be charged to the full potential of the source, the driver includes circuitry which decouples the base of the serially connected transistor from the source of potential and drives the transistor with charge accumulated in the base-toemitter junction of the transistor so that the serially connected transistor will not be turned off until the potential across the capacitive load reaches the potential of the driving source.
Abstract:
A monolithic semiconductor array of bi-level powered memory cells is provided with a number of on-chip row and column primary latching circuits. The primary latching circuits allow for the down-powering of the on-chip row and column address decoders after a particular chip and a particular storage cell on the chip have been selected by a respective address signal and a set signal. An auxiliary latching circuit, substantially identical to each of the aforesaid primary latching circuits, also is provided on-chip and receives the same set signal as does each primary latching circuit. The primary latching circuits and the auxiliary latching circuit are ''''set'''' substantially simultaneously by the set signal. The setting of the auxiliary latching circuit initiates a signal which downpowers each of the on-chip address decoders. Means are also provided on-chip for resetting each of the selected primary and the auxiliary latching circuits upon the termination of the chip select signal.