Global Standards for the Microelectronics Industry
Dictionary O
open-circuit input capacitance (Cibo)
The capacitance measured across the input terminals (emitter and base) with the collector open-circuited for ac. (Ref. IEEE Std 255.)
References:JESD10, 9/81
open-circuit output (of an integrated circuit)
A unipolar output whose only connection within the integrated circuit is through an active device, usually a transistor, to one of the supply voltages.
NOTE 1 For the purpose of this definition, the presence of any parasitic components and freewheeling, flyback, and clamp diode is ignored.
NOTE 2 When the active device is in its on state, the output voltage approaches the voltage of the supply to which it is connected (through the active device); when the device is in its off state, the output impedance to any other terminal of the integrated circuit is high and the output voltage is determined by the external circuit to which the output is connected.
NOTE 3 Outputs of this generic class are usually classified according to the name of the element of the active device to which they are connected within the integrated circuit, e.g., open-collector output, open-drain output, etc.
NOTE 4 For graphic symbols, see "sink driver" and "source driver".
References:JESD99B, 5/07
open-circuit output capacitance (Cobo)
The capacitance measured across the output terminals (collector and base) with the input open-circuited to ac. (Ref. IEEE Std 255.)
References:JESD10, 9/81
open-circuit voltage [floating potential], emitter-base (VEB(fl))
The dc open-circuit voltage (floating potential) between the emitter terminal and the base terminal when the collector terminal is biased in the reverse direction with respect to the base terminal. (Ref. IEEE Std 255.)
References:JESD10, 9/81
open-collector output
An open-circuit output whose internal connection is to the collector of a bipolar transistor.
NOTE For graphic symbols, see "sink driver" (for npn) or "source driver" (for pnp).
References:JESD99B, 5/07
open-drain output
An open-circuit output whose internal connection is to the drain of a field-effect transistor.
NOTE For graphic symbols, see "sink driver" (for n‑channel outputs) or "source driver"(for p‑channel outputs).
References:JESD99B, 5/07
open-drain output buffer
An output buffer that has one low-impedance output logic level and a high-impedance output state.
References:JESD12-4, 4/87
open-element output (of an integrated circuit)
Synonym for "open-circuit output (of an integrated circuit)".
References:JESD99B, 5/07
open-emitter output
An open-circuit output whose internal connection is to the emitter of a bipolar transistor.
NOTE For graphic symbols, see "source driver" (for npn) or "sink driver" (for pnp).
References:JESD99B, 5/07
open-source output
An open-circuit output whose internal connection is to the source of a field-effect transistor.
NOTE For graphic symbols, see "source driver" (for p‑channel outputs) or "sink driver" (for n‑channel outputs).
References:JESD99B, 5/07
operating lifetime
The length of time that a device is expected to function at or below the failure rate, stated in power-on hours (POH).
References:JESD94, 1/04
operational temperature cycle range
The temperature range of a component caused by power cycling.
References:JESD94#, 1/04
optical axis
A line about which the radiant-energy or sensitivity pattern is centered. (Ref. IEC 747‑5.)
NOTE 1 The radiant-energy or sensitivity pattern may be nonsymmetrical.
NOTE 2 The optical axis may deviate from the mechanical axis.
References:JESD77-B, 2/00
optimization (of a process)
The methodology of making a process as efficient as possible.
References:JEP132, 7/98
optimization (of logic)
The process by which a given logic representation is reduced to a superior equivalent functional representation with respect to some system or chip-level design objective such as speed, device utilization, level of logic, etc.
References:JESD12-1B, 8/93
JESD99B, 5/07
optional (OP)
The designation for pins for which the manufacturer has the freedom to supply a specialized function not previously defined in the standard without affecting compliance with the standard.
References:JESD21-C, 1/97
optocoupler; photocoupler; optoisolator
An optoelectronic device designed for the transformation of electrical signals by utilizing optical radiant energy to provide coupling with electrical isolation between the input and the output. (Ref. IEC 747‑5.)
References:JESD77-B, 2/00
optoelectronic device
(1) A device that is responsive to or that emits or modifies electromagnetic radiation in the visible, infrared, and/or ultraviolet spectral regions.
(2) A device that utilizes electromagnetic radiation in the visible, infrared, and/or ultraviolet spectral regions for its internal operation. (Ref. IEC 747‑5.)
References:JESD77-B, 2/00
outlier defect
A physical defect that is not correlated with a known process, equipment, or procedure and cannot be described by a probability-density function of time or location. References: JEP143B.01, 6/08outlier incident
An incident where outlier product significantly impacts customer reliability.
References:JESD62A, 5/02
