摘要:
A D-Type flip-flop arrangement includes first and second latches (30, 46). Circuitry (44) interposed between the latches blocks any metastable condition that may occur in the first latch from propagating into the second latch. Additionally, the arrangement minimizes the likelihood that the first latch will enter a metastable condition and, if it does, resolves the condition extremely rapidly.
摘要:
A latch circuit including an input logic network that incorporates emitter-coupled logic switching arrangements connected in multiple levels to perform logical operations on the received input signals. The latch circuit is controlled by differential clock signals coupled to a differential switch circuit that is connected to the input logic network to form another switch level. An output buffer is connected to the input logic network to generate output signals of selected logic voltage levels. When the differential clock signals are in a pass condition, the input logic network is enabled to transmit an output signal to the output buffer. When the differential clock signals are in a latch, or hold, condition, the input logic network is disabled and a feedback network is enabled to maintain the signal to the output buffer in the conditions it was in when the differential clock signals changed conditions.
摘要:
Logic circuits based on a differential amplifier with the common emitters thereof being connected through a constant current source generally require the use of a reference voltage (Vr) and associated transistor for each such differential amplifier to provide the reference level against which the two inputs (A, B) are compared to obtain the necessary logic operations. In order to eliminate the requirement for the reference voltage and the transistor, the input signals (A, B-) are selected to have the same relative amplitude difference (VL) between the high and low levels thereof and one of the two input signals is further controlled to be shifted relative to the other one by an amount equal to 1/2 such selected amplifier difference. The differential amplifier (42, 44) has a constant current source (50) and the respective output circuits (56, 66) are connected in emitter-follower configuration having constant current source resistors (60, 70) across which the output voltages are taken. By selecting the relative resistor values, the desired shift (1/2 VL) of the relative output level can be obtained. By employing additional sets of transistors in the differential amplifier, multiple inputs are accommodated and by utilizing output circuits having selected resistor value relationships, corresponding multiple outputs are obtained.
摘要:
A bistable circuit and shift register requiring less chip area and with greatly reduced current drain is realized with I sL logic gates. Each cell (28) of the register includes only four logic gates (10), connected as two binary R-S flip-flops, each gate consisting of a pair of merged PNP and NPN transistors. The two flip-flops are alternately energized by switching the current into the gate injectors in accordance with the phase of the clock signal. The use of fewer gates with simplified interconnections contribute to reduce chip area and current drain.
摘要:
Die Erfindung betrifft eine Speicheranordnung mit kreuzgekoppelten, in Zeilen (10, 11, 12) und Spalten (13, 14) angeordneten Speicherzellen (21 bis 26), mit denen die schnelle unmittelbare Übertragung von Daten von einer Speicherzelle der Speicheranordnung nach einer anderen Speicherzelle der Speicheranordnung möglich ist, während gleichzeitig die Daten gelesen werden. Jede Speicherzelle weist dabei ein Paar Transistoren (50,51) auf und ist zwischen einem Paar von Bit-Leseleitungen (39,40) angekoppelt. Jeder Spalte von Speicherzellen ist ein anderes Paar von Bit-Leseleitungen (39,40; 39a, 40a) zugeordnet. Jede Speicherzelle ist außerdem mit einem Paar von Schreibtransistoren (56, 57) ausgerüstet und zwischen einem Paar von Bit-Schreibleitungen (67,68) eingekoppelt. Ein weiteres Paar von Bit-Schreibleitungen (67a, 68a) ist jeder Spalte der Zellen, parallel zu den Bit-Leseleitungen (39, 40) zugeordnet. Lese-und Schreibdecodierer (30, 27) sind mit den Zeilen der Speicherzellen gekoppelt, die orthogonal zu den Spalten der Speicherzellen angeordnet sind. Dabei sind Schaltmittel (41, 42,37,38) vorgesehen, die die gerade aus einer Speicherzelle über eine Bit-Leseleitung ausgelesenen Daten nach den Schreibleitungen einer anderen Speicherzelle in der Speicheranordnung koppeln, so daß damit unmittelbar die aus der ersten Speicherzelle gerade ausgelesene Information in einer Zeile von Speicherzellen nach einer zweiten Speicherzelle in einer anderen Zeile von Speicherzellen übertragen wird, während gleichzeitig die so übertragene Information ausgelesen wird.