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Transistor cross ref7/28/2023 The first electronic latch was invented in 1918 by the British physicists William Eccles and F. Schematics from the Eccles and Jordan trigger relay patent filed 1918, one drawn as a cascade of amplifiers with a positive feedback path, and the other as a symmetric cross-coupled pair For example, 74HC75 is a quadruple transparent latch in the 7400 series. When a level-triggered latch is enabled it becomes transparent, but an edge-triggered flip-flop's output only changes on a clock edge (either positive going or negative going).ĭifferent types of flip-flops and latches are available as integrated circuits, usually with multiple elements per chip. The terms "edge-triggered", and "level-triggered" may be used to avoid ambiguity. Modern authors reserve the term flip-flop exclusively for edge-triggered storage elements and latches for level-triggered ones. The term flip-flop has historically referred generically to both level-triggered (asynchronous, transparent, or opaque) and edge-triggered ( synchronous, or clocked) circuits that store a single bit of data using gates. It can also be used for counting of pulses, and for synchronizing variably-timed input signals to some reference timing signal. When used in a finite-state machine, the output and next state depend not only on its current input, but also on its current state (and hence, previous inputs). Such data storage can be used for storage of state, and such a circuit is described as sequential logic in electronics. Flip-flops and latches are fundamental building blocks of digital electronics systems used in computers, communications, and many other types of systems.įlip-flops and latches are used as data storage elements to store a single bit (binary digit) of data one of its two states represents a "one" and the other represents a "zero". It is the basic storage element in sequential logic. The circuit can be made to change state by signals applied to one or more control inputs and will output its state (often along with its logical complement too). In electronics, flip-flops and latches are circuits that have two stable states that can store state information – a bistable multivibrator. For those of you who know HP Agilent Keysight gear well, how should I decode the following line from the parts list into a real, specific transistor? Once I've got that, I know how to find a replacement (based on cross ref or just parameters): Ref HP PN Description Mfr Mfr PN A4Q906 1853-0016 TRANSISTOR PNP SI TO-92 PD=300MW 28480 1853-0016 Googling 1853-0016 doesn't give me anything useful and I don't want to just drop a random transistor in there.An animated interactive SR latch ( R1, R2 = 1 kΩ R3, R4 = 10 kΩ). For instance, I've got a TO-92 at Q906 which has less-than-helpful silkscreen printing on it and the parts list in the schematic hasn't helped me so far. My question is more of a "how to do this" one versus a "which part do I need in this specific case" question. Quote from: dlucy67 on March 28, 2016, 05:04:56 pm I'm digging into a piece of HP gear, a 3466A digital multimeter, and I need to understand how I'd find a suitable replacement for a given transistor. Where can I take the above info, look it up, and yield a datasheet or at least the critical parameters to then go look for a replacement transistor? For those of you who know HP Agilent Keysight gear well, how should I decode the following line from the parts list into a real, specific transistor? Once I've got that, I know how to find a replacement (based on cross ref or just parameters): Ref HP PN Description Mfr Mfr PN A4Q906 1853-0016 TRANSISTOR PNP SI TO-92 PD=300MW 28480 1853-0016 Googling 1853-0016 doesn't give me anything useful and I don't want to just drop a random transistor in there. I'm digging into a piece of HP gear, a 3466A digital multimeter, and I need to understand how I'd find a suitable replacement for a given transistor.
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