Title:
INTEGRATED CIRCUIT
Document Type and Number:
Japanese Patent JPS60182742
Kind Code:
A
Abstract:
PURPOSE:To extract only a bus, and to inspect the bus simply in a short time by connecting another terminal separate from the pad connecting terminal of the bus connecting a functional block and a junction pad for external connection to a pad for inspecting the bus. CONSTITUTION:Buses 3 connecting a memory block 2 and a junction pad group 4 for external connection are formed to a pectinate shape, pad groups 5 for inspection are fitted at the terminals of the buses (signal lines), and the buses are inspected by a probe. According to the constitution, only the buses are extracted without operating the memory block 2, and the buses can be inspected in a short time. Changeover pads 6A-6E are lead out actually from the buses 3A-3E, signals are transmitted over the changeover pads, and a designated inspecting pad 5 is selected through a transfer gate. The changeover pads 6 are kept at grounding potential at all times, and the buses are selected in such a manner that supply voltage is applied to the changeover pads and a transistor is turned ON. Accordingly, stable contacts among the probe and the pads are obtained by the inspecting pads 5 in the same number as the buses.
Inventors:
TAKEMAE YOSHIHIRO
Application Number:
JP3784384A
Publication Date:
September 18, 1985
Filing Date:
February 29, 1984
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H01L27/10; H01L21/82; H01L21/822; H01L21/8242; H01L27/02; H01L27/04; H01L27/108; (IPC1-7): H01L27/04; H01L27/10
Attorney, Agent or Firm:
Sadaichi Igita