Electronic digital logic circuitry – Interface – Logic level shifting
Patent
1998-09-25
2000-09-19
Tokar, Michael
Electronic digital logic circuitry
Interface
Logic level shifting
326 81, 326 84, H03K 190175
Patent
active
061217921
ABSTRACT:
To provide an input circuit of an IC wherein the current flowing towards the input terminal when receiving a LOW level signal can be restricted to minimum, and the input threshold level can be controlled appropriately without degrading transition performance of the input circuit, an input circuit includes: a current control means for controlling a first current to be supplied to a first node according to a second current to be supplied to a second node an input level transfer means for transferring logic of the external logical signal into an intermediate signal whereof potential of a HIGH level is restricted within a power supply voltage; a level shift means for shifting a LOW level of the intermediate signal to substantially the same level of a LOW level of the external logical signal; an inverter for outputting a signal of low output impedance by inverting the shifted intermediate signal; and a transition current generating means for controlling the level shift means to supply a sufficient transition current for turning the inverter at a high-speed when the external signal turns from the LOW level to the HIGH level.
REFERENCES:
patent: 5289056 (1994-02-01), Keown et al.
patent: 5739726 (1998-04-01), Ling
patent: 5812014 (1998-09-01), Mazzucco et al.
Le Don Phu
NEC Corporation
Tokar Michael
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