DM7447A Datasheet | National Semiconductor

Description The DM7446A and DM7447A feature active-LOW outputs designed for driving mon-anode LEDs or incandescent indicators directly. All of the circuits have full ripple-blanking input/output controls and a lamp test input. Segment identification and resultant displays are shown on a following page. Display patterns for BCD input counts above nine are unique symbols to authenticate input conditions. All of the circuits incorporate automatic leading and/or trailing-edge, zero-blanking control (RBI and RBO). Lamp test (LT) of these devices may be performed at any time when the BI/RBO node is at a HIGH logic level. All types contain an overriding blanking input (BI) which can be used to control the lamp intensity (by pulsing) or to inhibit the outputs. Features s All circuit types feature lamp intensity modulation capability s Open-collector outputs drive indicators directly s Lamp-test provision s Leading/trailing zero suppression Ordering Code: Order Number DM7446AN DM7447AN Package Number Package Description N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Connection Diagram © 2001 Fairchild Semiconductor Corporation DS006518 .fairchildsemi. DM7446A, DM7447A Function Table Decimal or Inputs BI/RBO Outputs Note Function LT RBI D C B A (Note 1) a b c d e f g HHL L L L L L L L L LH HXL L LH HL LHHHH HXL LHL L LHL LHL HX L LHH L L L...