74141 Datasheet | National Semiconductor

DESCRIPTION - The ’141 is a BCD-to-decimal decoder driver that is de­ signed to accept a 4-bit BCD code input and drive cold-cathode indicator tubes. This decoder utilizes design improvements that minimize switching transients in order to maintain a stable display. The segments and numeric designations chosen to representthedecimal numbers areshown inthe Truth Table. For binary inputs 10 through 15, the outputs are OFF. These invalid codes can be used in blanking leading ortrailing-edgezeroes in a display. The ten high performance, npn output transistors have a maximum reverse cur­ rent of 50 ju A at 55 V. Typical power dissipation is 55 m W. ORDERING CODE: See Section 9 PKGS PIN OUT MERCIAL GRADE Vcc = +5.0 V ±5%, T a = 0°C to +70° C Plastic DIP (P) 74141 PC Ceramic DIP (D) 74141 DC PKG TYPE 9B 6B LOGIC SYMBOL TTTTTTTTTT" 16 15 8 9 13 14 11 10 1 2 Vcc = Pin 5 G N D = Pin 12 INPUT LOADING/FAN-OUT: See Section 3 for U.L. definitions PIN NAMES DESCRIPTION Ao Ai - A3 Co - Og BCD Input BCD Inputs Outputs (Active LOW) - OC - Open Collector 74XX (U.L.) HIGH/LOW 1 .0 / 1 .0 2 .0 / 2 . 0 OCV7.0 m A FUNCTIONAL DESCRIPTION - The 1-of-10 decoder/driver accepts BCD inputs from all TTL circuits and produces the correct output selection to directly drive gas filled cold cathode indicator tubes. The outputs are selected as shown in the Truth Table. It is capable of driving all known available cold cathode indicator tubes having 7.0 m A or less cathode...