309-509
Features o One integrated circuit required for plete keyboard assembly. o Outputs directlypatiblewith TTLor MOSlogic arrays. o External control provided for output polarity selection. . External control provided for selectionof odd or even parity. o Two key roll-overoperation. o N-keylockout. o Self-containedoscillatorcircuit. o Externally controlled delay network provided to eliminate the effectof contactbounce. o Static charge protection on all input and output terminals.
Figure'l Pinconnections
Figure2 Block diagram lll
'- l qmrnr rg I
^'l- l
,MSn-
19A[r A(ES r 3MGt r.l
. Rl lc8old Ct (.maa Fl m OVIDE FPSgt't.5mr r' R2ltootl,C2l3op Fl
O€LAY
Pn OVDE s Or H: Cl-OCl( FREOUEi TY nru T(o?Ttot{l
Electrica I characteristics
Maximum ratings
V61and V66(with respectto Vcc)
-20Vto +0.3V logic input voltages (with respectto Vcc) -20 V to 0.3V
Storage Temperature
-65"Cto +150"C
Operating Temperature Rarrge
0"Cto +70'C
Exceedingthese ratings could causepermanentdamage....
