JPH04242962A - Ic socket - Google Patents

Abstract

PURPOSE:To change IC logic by a gate unit by providing a switch to select either directly or through an inverter a pin for external connection and a contact for receiving an IC pin are connected. CONSTITUTION:An inverter 3 and a switch 4 are arranged between an input pin 1 for an external signal and a contact 2 for receiving the IC pit corresponding the pin 1. The switch serves to select either directly or through the inverter to connect the pin 1 and the contact 2. The inverter is backward-connected between the switch and a signal output pin. The inverter may alternatively be grounded at the contact side of the switch.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to IC sockets, and more particularly to IC sockets for use with logic gate ICs.

0002

2. Description of the Related Art Conventional IC sockets have consisted solely of a mechanism that allows ICs to be replaced.

0003

[Problems to be Solved by the Invention] This conventional IC socket does not have a function that can change the logic of the IC.

By the way, many commonly used ICs have multiple gates of the same logic, such as AND circuits, O
If you want to use one gate for each R circuit, use an AND circuit IC,
A total of two ICs, one for each of the OR circuits, are required, and in this case, the gates of each IC are left over, which is wasted.

[0005] An object of the present invention is to
The purpose of the present invention is to provide an IC socket that can effectively use multiple ICs.

[0006]

[Means for Solving the Problems] The IC socket of the present invention switches whether at least one inverter, a contact for receiving an IC pin, and a pin for external connection are connected directly or via the inverter. Equipped with a switch.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention, and FIG. 2 is a circuit diagram of a portion related to one pin for signal input in this embodiment.

As shown in FIG. 2, an inverter 3 and a switch 4 are arranged between a pin 1 for signal input for external connection and a contact 2 for receiving an IC pin corresponding to this pin 1. The wiring is such that a switch 4 can be used to switch between connecting the two directly or via an inverter 3. For signal output pins, the inverter is oriented in the opposite direction to that shown in FIG. Alternatively, the inverter may be connected closer to the contacts than the switch.

Here, for example, between a 2-input AND circuit and a 2-input OR circuit, there is a negative value of A and B between the two inputs A and B = (negative value of A) + (negative value of B). There is a relationship, A.
Since B is the negative value of {(negative value of A)+(negative value of B)}, the AND circuit is the same as an OR circuit whose input and output are inverted. Based on this principle, by switching switch 4 for each gate, even an AND circuit IC can perform OR operation.
It can be used as a circuit, or as an AND circuit in an OR circuit IC or as an AND circuit.

Note that the power terminal and ground terminal of the inverter 3 constituted by transistors are respectively connected to the pins of this embodiment corresponding to the power supply pin and the ground pin of the IC.

0012

[Effects of the Invention] As explained above, the present invention provides an IC socket by incorporating an inverter and a switch into an IC socket.
Since the logic can be changed in units of one gate, logic gate ICs can be used effectively in electronic equipment, and the number of ICs used can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the invention.

FIG. 2 is a circuit diagram of a portion related to one pin for signal input in the embodiment shown in FIG. 1;

[Explanation of symbols]

1 Pin 2 Contact 3 Inverter 4 Switch

Claims (1)

[Claims] 1. An IC characterized by comprising at least one inverter and a switch for switching between connecting a contact receiving an IC pin and an external connection pin directly or connecting through the inverter. socket.