54LS49

54LS49 BCD to 7-Segment Decoder 54LS49 BCD to 7-Segment Decoder General Description The 54LS49 translates four lines of BCD (8421) input data into the 7-segment numeral code as shown in the Function Table It has open-collector outputs and is logically the 14pin verson of the ’48 without the lamp test and ripple blanking features Also see the ’LS249 data sheet Connection Diagram Dual-In-Line Package Logic Symbol June 1989 TL F 10204 – 1 Order Number 54LS49DMQB or 54LS49FMQB See NS Package Number J14A or W14B VCC e Pin 14 GND e Pin 7 Pin Names A0 – A3 BI a–g Description BCD Inputs Blanking Input (Active LOW) Segment Outputs (Active HIGH) Numerical Designations Resultant Displays TL F 10204 – 2 TL F 10204 – 3 C1995 National Semiconductor Corporation TL F 10204 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 5 5V Operating Free Air Temperature Range 54LS b55 C to a125 C Storage Temperature Range b65 C to a150 C Recommended Operating Conditions Symbol Parameter VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device sho...