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74141 Dataheets PDF



Part Number 74141
Manufacturers National Semiconductor
Logo National Semiconductor
Description 1-of-10 Decoder/Driver
Datasheet 74141 Datasheet74141 Datasheet (PDF)

74141 1-OF-10 DECODER/DRIVER (NIXIE) (With Open-Collector Outputs) 141 CONNECTION DIAGRAM PINOUT A 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 intheTruth Table. For binary inputs 10 through 15.

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74141 1-OF-10 DECODER/DRIVER (NIXIE) (With Open-Collector Outputs) 141 CONNECTION DIAGRAM PINOUT A 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 intheTruth 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 juA at 55 V. Typical power dissipation is 55 mW. ORDERING CODE: See Section 9 PKGS PIN OUT COMMERCIAL GRADE Vcc = +5.0 V ±5%, T a = 0°C to +70° C Plastic DIP (P) A 74141 PC Ceramic DIP (D) A 74141 DC PKG TYPE 9B 6B LOGIC SYMBOL 3 6 7 4 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 mA 141 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 mA or less cathode current. Ao Ai LOGIC DIAGRAM A2 TRUTH TABLE A3 INPUTS OUTPUT A3 A2 A1 Ao ONt L LLL 0 L LLH 1 L L HL 2 L L HH 3 L HL L 4 L HL H 5 L HHL 6 L HHH 7 H LLL H LLH H XHX 8 9 NONE H H X X NONE t All other outputs are off H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) SYMBOL PARAMETER 74XX Min Max UNITS CO N D ITIO N S VOL Output LOW Voltage Output HIGH Voltage VOH (for Input Counts 0 thru 9) 2.5 60 V Vcc = Min lo = 7.0 mA V Vcc = Max lo = 0.5 mA lO H Output HIGH Current 50 /x A Vcc = Max V0 = 55 V Output HIGH Current lO H (for Input Counts 10 thru 15) 5.0 TA = 55° C Vcc = Max 15 /*A T a =70°C Vo = 30 V Icc Power Supply Current 25 mA Vcc = Max All Inputs = Gnd .


MSM6656 74141 2DPFS20V


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