Abstract:
A circuit for controlling frequency and/or phase response characteristic of a signal amplification system or channel has a serial architecture composed of a plurality of cells and a selector for deriving the signal after any one of the cascaded cells. At least a component of the RC network of each cell is in the form of a plurality of modules of fractionary value connected in series. A short-circuiting switch is associated with each module of fractionary value and the overall effect may be selected by selecting the derivation node of the output signal and a certain configuration of the short-circuiting switches of the RC networks of the various cells. An outstanding flexibility of selection is achieved.
Abstract:
A circuit (1) generates flexible timing permitting a slow or fast overall timing configuration, and two configurations of the precharge and detecting intervals by providing both with two (short or long) duration levels. For this purpose, the circuit (1) includes a variable, asymmetrical propagation line (5, 37) composed of a succession of elementary delay elements (6-8, 38, 40) enabled or disabled on the basis of memorized logic signals (TIMS, PCS, DETS), the state of which is determined when debugging the memory (100) in which the circuit (1) is implemented.
Abstract:
A new method for testing an electrically programmable non-volatile memory and comprising a cell matrix and a state machine which governs the succession and timing of the memory programming phases by means of some control signals (WEN, CEN, OEN and DU) provides exclusion of the internal state machine and modification of the meaning of at least one of the control signals (WEN, CEN, OEN and DU) to program directly the cell matrix and then verify programming correctness.
Abstract:
A TTL/CMOS interface circuit having a tripping threshold unaffected by variations in temperature and supply voltage, comprises an input stage (Si), and an output stage (Su) which is an inverter. The input stage comprises a pair of inverters (M2,M3 and M5,M6) powered through a current mirror structure (M1,M4). The first of said inverters (M2,M3 and M5,M6) has an input terminal connected to a voltage reference (VREF) with the same value as the TTL switching threshold, and an output terminal connected to a control terminal (A) of the current mirror structure (M1,M4). The second inverter (M5,M6) has an input terminal (IN) forming the input terminal of the interface circuit and an output terminal connected to the output stage (Su). The interface circuit is supplied a voltage equal to the CMOS supply voltage.
Abstract:
A method for generating a reset signal in an electrically programmable non-volatile storage device (1) of a type which comprises a matrix (2) of memory cells and a control logic portion (3) being supplied a supply voltage (Vcc) and a programming voltage (Vpp), and a threshold detection circuit (5) adapted to detect a decrease in the supply voltage (Vcc), provides for the signal applied to the control logic (3) to be obtained as a change-over function between the output signal from the threshold detector (5) and a reset signal (POR) generated during the power-on transient of the device.
Abstract:
A redundancy circuitry for a semiconductor memory device comprising a matrix of memory elements, comprises a plurality of programmable non-volatile memory registers (1), which are programmable to store addresses of defective memory elements which must be replaced by redundancy memory elements; the redundancy circuitry comprises combinatorial circuit means (3) supplied by address signals (ADD) and supplying the non-volatile registers (1) with an inhibition signal (DIS) for inhibiting the selection of redundancy memory elements when a memory element of the matrix is addressed whose address coincides with the address stored in a non-programmed memory register (1).