器件名称:
DM74LS249N
功能描述:
BCD to 7-Segment Decoder with Open-Collector Outputs
文件大小:
103.45KB 共6页
简 介:
DM74LS249 BCD to 7-Segment Decoder with Open-Collector Outputs February 1992 DM74LS249 BCD to 7-Segment Decoder with Open-Collector Outputs General Description The ’LS249 has active HIGH open-collector outputs and incorporates the Lamp Test and BI RBO inputs Additionally the ’LS249 will light the top bar (segment a) for numeral 6 and the bottom bar (segment d) for numeral 9 Connection Diagram Dual-In-Line Package Logic Symbol TL F 10213 – 2 TL F 10213 – 1 VCC e Pin 16 GND e Pin 8 Order Number DM74LS249N See NS Package Number N16E Pin Names A0 – A3 BI LT BI RBO a–g Description BCD Inputs Blanking Input (Active LOW) Lamp Test Input (Active LOW) Blanking Input (Active LOW) or Ripple Blanking Output (Active LOW) Segment Outputs (Active HIGH) C1995 National Semiconductor Corporation TL F 10213 RRD-B30M105 Printed in U S A Absolute Maximum Ratings Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range (Note) Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation 7V 7V 0 C to a 70 C b 65 C to a 150 C Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Parameter Supply Voltage High Level Inp……
