| 摘要 |
1501311 Cross-coupled bi-stable MARCONI CO Ltd 8 Nov 1976 [19 Feb 1976] 06529/76 Heading H3T A cross-coupled bi-stable circuit comprises first, second and third pairs of transistors T3-T1, T4-T2, and T7-T8 substantially as shown in Fig. 2 and means for applying clock signals so as to switch current from an inner to an outer one transistor of the pairs T3-T1, T4-T2 in dependence upon the state of an input signal applied to a first transistor of the first and second pairs. The means for switching current may comprise a fourth transistor pair T5-T6. Data input applied to T3 and/or T4 may be single ended or complementary, as may the clock input applied to T5 and/or T6. Items 5, 6, 18 are level-shifting circuits. Operation.-With T6 conducting (ON) T1 and T2 are non-conducting (OFF) and the outputs 14, 15 may charge in response to the data input 7, 8, only one of transistors T3, T4 being ON. With T5 ON, the current which was previously flowing in T3 or T4 is transferred to the corresponding transistor T1 or T2, thus maintaining the outputs 14, 15 at their previous states. Outputs 14, 15 are effectively isolated from the switching transients which occur when current is being transferred from T3 to T 1 or vice versa (or T4 and T2 as appropriate) and this isolation helps to minimize clock breakthrough. This, and the fact that the output nodes have less stray capacity due to fewer components being connected to them than in a prior art arrangement (Fig. 1, not shown) is said to enable a discrete component embodiment to be used at up to 1À2 GHz.
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