Here are various documents from Signetics, including data and application notes.

Signetics 1971 Interface Applications Memos - Application notes for Signetics' "8T--" TTL-type interface integrated circuits. Included are: 7-segment displays, line drivers and receivers and one-shot multivibrators.

Signetics 1973 555 556 Timers - Data sheets and application notes for the famous 555 timer and the 556 dual timer. Lots of interesting circuits. Has annotations from an unknown previous reader.