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74LS249PC Rochester Electronics - - -
74LS249PC National Semiconductor Corporation Rochester Electronics 33 $0.43 $0.35
SN74LS249JD Rochester Electronics - - -
SN74LS249JDS Rochester Electronics - - -
SN74LS249JS Rochester Electronics - - -
SN74LS249N Rochester Electronics - - -
SN74LS249ND Rochester Electronics - - -
SN74LS249NDS Rochester Electronics - - -
SN74LS249NS Rochester Electronics - - -
SN74LS249W Rochester Electronics - - -

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74LS249 datasheet (4)

Part Manufacturer Description Type PDF
74LS249 Fairchild Semiconductor Full Line Condensed Catalogue 1977 Scan PDF
74LS249DC Fairchild Semiconductor BCD to 7 Segment Decoder Scan PDF
74LS249FC Fairchild Semiconductor BCD to 7 Segment Decoder Scan PDF
74LS249PC Fairchild Semiconductor BCD to 7 Segment Decoder Scan PDF

74LS249 Datasheets Context Search

Catalog Datasheet MFG & Type PDF Document Tags
74LS247

Abstract: PIN DIAGRAM 74LS247 TTL 7448 PIN DIAGRAM 74LS248 pin diagram of 74LS247 9368 compatibili 74LS248 TTL 7446 TTL 74154 7-seg
Text: /74LS248 54LS/ 74LS249 TTTTTTTTTT 16 15 8 9 13 14 11 10 1 2 Vcc = Pin 5 GND = Pin 12 7 1 2 6 3 5 I I I , 1.3 5.5 H — 125 D141 4L.6B, 9B 5 54LS/ 74LS249 7-Seg OC Decoder/Dvr TTL Yes Yes No 1.3 5.5 H — 40 , -Seg Decoder/Driver 54LS/ 74LS249 1.3 5.5 H X — 40 D141 4L.6B.9B 20 7-Seg LED Driver Common Cathode 9368 20


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PDF 93L11, O10O11O12O13 O14O15 54LS/74LS48, 54LS/74LS248 54LS/74LS249 54LS/74LS49 9317B, 9317C, 54LS/74 74LS247 PIN DIAGRAM 74LS247 TTL 7448 PIN DIAGRAM 74LS248 pin diagram of 74LS247 9368 compatibili 74LS248 TTL 7446 TTL 74154 7-seg
74ls247

Abstract: PIN DIAGRAM 74LS247 74LS248 74LS249 pin diagram of 74LS247 74ls247 pin configuration diode 5404 motorola ls47 MOTOROLA SN54/74LS248 74LS247 data sheet
Text: SN54/74LS247 SN54/74LS248 SN54/ 74LS249 BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS The SN54/74LS247 thru SN54/ 74LS249 are BCD-to-Seven-Segment Decoder/Drivers. The LS247 and LS248 are functionally , SEGMENT IDENTIFICATION FAST AND LS TTL DATA 5-402 SN54/74LS247 · SN54/74LS248 · SN54/ 74LS249 , 5-403 (14) (5) OUTPUT f (3) OUTPUT g SN54/74LS247 · SN54/74LS248 · SN54/ 74LS249 , SN54/ 74LS249 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC


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PDF SN54/74LS247 SN54/74LS248 SN54/74LS249 SN54/74LS247 SN54/74LS249 LS247 LS248 LS249 16-pin 14-pin 74ls247 PIN DIAGRAM 74LS247 74LS248 74LS249 pin diagram of 74LS247 74ls247 pin configuration diode 5404 motorola ls47 MOTOROLA SN54/74LS248 74LS247 data sheet
74LS247

Abstract: IC 74LS247 74ls248 74ls247 pin configuration SN74LS248 74ls249 54LS249
Text: / 74LS249 BCD-TO-SEVEN-SEGMENT D ECO D ERS/D RIVERS LOW POWER SCHOTTKY SN54LS/74LS247 (TOP VIEW) OUTPUTS 4 SN 54LS/74LS248 SN 54LS/ 74LS249 (TOP VIEW) OUTPUTS 0 1 2 3 4 5 6 , DEVICES 4 -2 1 9 SN 54LS/74LS247 · SN 54LS/74LS248 · SN 54LS/ 74LS249 ALL CIRCUIT TYPES FEATURE LAMP , SCHOTTKY TTL DEVICES 4 -2 2 0 SN 54LS/74LS247 · SN 54LS/74LS248 · SN 54LS/ 74LS249 LS247 FUNCTION , , R L = 6 .0 kO MOTOROLA SCHOTTKY TTL DEVICES SN 54LS/ 74LS249 GUARANTEED OPERATING RANGES


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PDF 16-pin 14-pin 74LS247 IC 74LS247 74ls248 74ls247 pin configuration SN74LS248 74ls249 54LS249
1996 - 74LS247

Abstract: 74LS248 74ls249 SN74LS248 PIN DIAGRAM 74LS247 pin diagram of 74LS247 LS249 74ls247 pin configuration 74LS247 PIN OUT PIN DIAGRAM 74LS248
Text: SN54/74LS247 SN54/74LS248 SN54/ 74LS249 BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS The SN54/74LS247 thru SN54/ 74LS249 are BCD-to-Seven-Segment Decoder/Drivers. The LS247 and LS248 are functionally , SEGMENT IDENTIFICATION FAST AND LS TTL DATA 5-1 SN54/74LS247 · SN54/74LS248 · SN54/ 74LS249 SN54 , / 74LS249 LS247 FUNCTION TABLE DECIMAL OR FUNCTION LT RBI D C B A 0 1 2 3 H , RBI Input 100 100 ns CL = 15 pF RL = 6.0 k FAST AND LS TTL DATA 5-5 SN54/ 74LS249


Original
PDF SN54/74LS247 SN54/74LS248 SN54/74LS249 SN54/74LS247 SN54/74LS249 LS247 LS248 LS249 16-pin 14-pin 74LS247 74LS248 74ls249 SN74LS248 PIN DIAGRAM 74LS247 pin diagram of 74LS247 74ls247 pin configuration 74LS247 PIN OUT PIN DIAGRAM 74LS248
74LS247

Abstract: 74LS248 74LS47 gate diagram 7-seg ANODE COMMON 74LS249 d141 D143 transistor 6B 9374 74LS49
Text: 1.3 5.5 H — 125 D141 4L.6B, 9B 5 54LS/ 74LS249 7-Seg OC Decoder/Dvr TTL Yes Yes No 1.3 5.5 H — 40 , -Seg Decoder/Driver 54LS/ 74LS249 1.3 5.5 H X — 40 D141 4L.6B.9B 20 7-Seg LED Driver Common Cathode 9368 20


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PDF 1-of-10 74LS247 74LS248 54LS/74LS47 54LS/74LS48 54LS/74LS49 54LS/74LS247 54LS/74LS248 54LS/74LS249 74LS47 gate diagram 7-seg ANODE COMMON 74LS249 d141 D143 transistor 6B 9374 74LS49
74LS247

Abstract: 74ls247 pin configuration 74ls248 74ls247 PIN diagram 74LS247 PIN OUT SN74LS248 pin diagram of 74LS247 LS249 LS248 TTL 74ls247
Text: (M ) M O T O R O L A BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS The SN54/74LS247 thru SN54/ 74LS249 , · Leading/Trailing Zero Suppression SN54/74LS247 SN54/74LS248 SN54/ 74LS249 , SEGMENT IDENTIFICATION FAST AND LS TTL DATA 5-248 SN54/74LS247 · SN54/74LS248 · SN54/ 74LS249 SN54 , /74LS247 · SN54/74LS248 · SN54/ 74LS249 LS247 FUNCTION TABLE DECIMAL OR FUNCTION 0 1 2 3 4 5 6 7 8 9 10 11 , TTL DATA 5-252 SN54/ 74LS249 GUARANTEED OPERATING RANGES Symbol VCC Supply Voltage Parameter 54


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PDF SN54/74LS247 SN54/74LS249 LS247 LS248 LS249 16-pin 14-pin LS247, 74LS247 74ls247 pin configuration 74ls248 74ls247 PIN diagram 74LS247 PIN OUT SN74LS248 pin diagram of 74LS247 TTL 74ls247
IC 74LS247

Abstract: 74LS247 LT 5249 74LS249 LT 5252 PIN DIAGRAM 74LS247 74LS248 LT 5251 74ls247 PIN diagram pin diagram of 74LS247
Text: (g) MOTOROLA BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS The SN54/74LS247 thru SN54/ 74LS249 are , /Trailing Zero Suppression SN54/74LS247 SN54/74LS248 SN54/ 74LS249 BCD-TO-SEVEN-SEGMENT DECODERS , /74LS247 · SN54/74LS248 · SN54/ 74LS249 SN 54/74LS 248 SN 54/74LS 259 (TOP VIEW) OUTPUTS _ A , ggSD-s-" OUTPUT 9 FAST AND LS TTL DATA 5-249 SN54/74LS247 · SN54/74LS248 · SN54/ 74LS249 LS247 , 5-252 SN54/ 74LS249 GUARANTEED OPERATING RANGES Sym bol V CC S u pply Voltage P aram eter 54 74 54


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PDF SN54/74LS247 SN54/74LS249 LS247 LS248 LS249 16-pin 14-pin LS247, IC 74LS247 74LS247 LT 5249 74LS249 LT 5252 PIN DIAGRAM 74LS247 74LS248 LT 5251 74ls247 PIN diagram pin diagram of 74LS247
74LS247

Abstract: f 9368 74LS47 pin TTL 7448 decoder 74LS48 TTL 7446 9368 TTL 74154 pin diagram of 74LS247 decoder 74LS47
Text: /74LS248 54LS/ 74LS249 TTTTTTTTTT 16 15 8 9 13 14 11 10 1 2 Vcc = Pin 5 GND = Pin 12 7 1 2 6 3 5 I I I , 54LS/ 74LS249 1.3 5.5 H X — 40 D141 4L.6B.9B 20 7-Seg LED Driver Common Cathode 9368 20 1.7 H X _ 225


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PDF 93L11, O10O11O12O13 O14O15 54LS/74LS48, 54LS/74LS248 54LS/74LS249 54LS/74LS49 9317B, 9317C, 54LS/74 74LS247 f 9368 74LS47 pin TTL 7448 decoder 74LS48 TTL 7446 9368 TTL 74154 pin diagram of 74LS247 decoder 74LS47
7447

Abstract: pin diagram decoder 7447 TTL 7447 74ls247 TTL 7448 TTL 7446 7447 ttl ttl 7441 7441 CI 7446
Text: /74LS248 54LS/ 74LS249 TTTTTTTTTT 16 15 8 9 13 14 11 10 1 2 Vcc = Pin 5 GND = Pin 12 7 1 2 6 3 5 I I I , D141 4L,6B,9B 19 7-Seg Decoder/Driver 54LS/ 74LS249 1.3 5.5 H X — 40 D141 4L.6B.9B 20 7-Seg LED


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PDF 93L11, O10O11O12O13 O14O15 54LS/74LS48, 54LS/74LS248 54LS/74LS249 54LS/74LS49 9317B, 9317C, 54LS/74 7447 pin diagram decoder 7447 TTL 7447 74ls247 TTL 7448 TTL 7446 7447 ttl ttl 7441 7441 CI 7446
transistor d133

Abstract: ttl 7442 Decoder BCD 7 seg transistor 6B 7-seg ANODE COMMON 74LS247 74155 pin diagram of 74LS247 ttl 74191 75491
Text: / 74LS248 7-Seg Decoder/Dvr TTL Yes Yes No 1.3 5.5 H — 125 D141 4L.6B, 9B 5 54LS/ 74LS249 7-Seg OC , D141 4L,6B,9B 19 7-Seg Decoder/Driver 54LS/ 74LS249 1.3 5.5 H X — 40 D141 4L.6B.9B 20 7-Seg LED


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PDF 74LS190 74LS191 93L21, 54/74S139, 54LS/74LS139 54LS/74LS155 54LS/74LS156 93L01, 93L34, 54LS/74LS259 transistor d133 ttl 7442 Decoder BCD 7 seg transistor 6B 7-seg ANODE COMMON 74LS247 74155 pin diagram of 74LS247 ttl 74191 75491
74LS247

Abstract: IC 74LS247 74LS248 74ls247 pin configuration SN74LS248
Text: R E S S IO N SN54/74LS247 SN54/74LS248 SN54/ 74LS249 BCD -TO -SEVEN -SEG M EN T D E C O D E R S , / 74LS249 A U . CIRCUIT TYPES FEATURE L A M P INTENSITY MODULATION CAPABILITY DRIVER OUTPUTS TYPE , / 74LS249 LS247 FUNCTION TABLE D E C IM A L on FUNCTION 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Bl RBI LT , FAST AND LS TTL DATA 5-209 SN54/ 74LS249 GUARANTEED OPERATING RANGES S YM B O L V cc ta


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PDF
7 segment 14-pin

Abstract: 74LS249 LS249 LS49 54LS249DM 54LS249FM 74LS249DC 74LS249FC 74LS249PC
Text: 0°C to +70° C 74LS249PC 74LS249DC 74LS249FC MILITARY GRADE Vcc = +5.0 V ±10%, Ta = -55° C to , 249 ' r f 54LS/ 74LS249 BCD TO 7-SEGMENT DECODER (With Open-Collector Outputs) DESCRIPTION — The 'LS249 has active HIGH open-collector outputs and is the 16-pin version of the 14-pin 'LS49. The'LS249 incorporates the Lamp Test and BI/RBO inputs that are omitted in the'LS49. Additionally, the'LS249 will light the top bar (segment a) for numeral 6 and the bottom bar (segment d) for numeral 9. For


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PDF 54LS/74LS249 LS249 16-pin 14-pin 74LS249PC 74LS249DC 74LS249FC 54LS249DM 7 segment 14-pin 74LS249 LS49 54LS249DM 54LS249FM 74LS249DC 74LS249FC 74LS249PC
D74LS

Abstract: BCD-to-seven-Segment Decoders 74LSO
Text: · BCD-to-Seven-Segment Decoders/Drivers (with open collector outputs) The HD74LS249 is 16-pin versions of the HD74LS49, respec tively. Included in the H D74LS249 circuits is the full func tional capability for lamp test and ripple blanking, which is not available in the H D74LS circuits. The H 07 4 L S 4 9 com poses the Qi and ^ w ith o u t tails and the H D 74LS249 com poses the ¿y and ^ /w ith tails , H D 74LS249 features active-low outputs de signed for driving indicators directly. Ail of the


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PDF HD74LS249 16-pin HD74LS49, D74LS249 D74LS 74LS249 T-90-10 74LSO ib203 BCD-to-seven-Segment Decoders
TTL 74154

Abstract: ttl 7448 TTL 7447 74154 TTL 7446 74LS247 f 9368 7449 74LS47 pin 7447 ttl
Text: FAIRCHILD LOGIC/CONNECTION DIAGRAMS DIGITAL -TTL D138 9311, 93L11, 54/74154 1819 23 22 21 20 E Ao Ai A2 A3 Oo Ol 02 Os O4 05 06 O7 Os O9 O10O11O12O13 O14O15 mTTTTTTTTTTTTT 1 2 3 4 S 6 7 8 9 10 11 13 14 15 16 17 Vcc = Pin 24 GND = Pin 12 D139 9319, 9320 TTTTTTTTTT 15 14 13 12 11 10 9 7 6 5 Vcc = Pin 16 GND = Pin 8 D140 9315 54/7441, 74141 D141 9307, 54/7448, 54LS/74LS48, 54LS/74LS248 54LS/ 74LS249 TTTTTTTTTT 16 15 8 9 13 14 11 10 1 2 Vcc = Pin 5 GND = Pin 12 7 1 2 6 3 5 I I I


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PDF 93L11, O10O11O12O13 O14O15 54LS/74LS48, 54LS/74LS248 54LS/74LS249 54LS/74LS49 9317B, 9317C, 54LS/74320 TTL 74154 ttl 7448 TTL 7447 74154 TTL 7446 74LS247 f 9368 7449 74LS47 pin 7447 ttl
LS249

Abstract: LS49 74ls249
Text: (F) OUT A A A CO M M ERCIAL GRADE Vcc = +5.0 V ±5%, T a = 0°C to +70° C 74LS249PC 74LS249DC 74LS249FC , 249 /M f r: CO NNECTIO N DIAGRAM PINOUT A 54LS/ 74LS249 1- A, [ 7 a2 l t BCD TO 7-SEGMENT DECODER (With O pen-Collector Outputs) [T [T r T il Vcc 751 r H la 751 a Ï2 | b B i/R B Ö [7 r b ì[£ a3 (T TT| c To] d a o [T g n d [T ~9~| e DESCRIPTION - The 'LS249 has active HIGH open-collector outputs and is the 16-pin version of the 14-pin 'LS49. T h e 'LS249


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PDF 54LS/74LS249 LS249 16-pin 14-pin 74LS249PC 74LS249DC 74LS249FC 54LS249DM LS49 74ls249
hd74ls pin

Abstract: 74LSOO HD74LS HD74LS249 HD74LS49 D74LS
Text: · BCD-to-Seven-Segment Decoders/Drivers (with open collector outputs) The HD74LS249 is 16-pin versions of the HD74LS49, respec tively. Included in the H D74LS249 circuits is the full func tional capability for lamp test and ripple blanking, which is not available in the H D74LS circuits. The H 07 4 L S 4 9 com poses the ¿ /a n d ^ w ith o u t tails and the H D 74LS249 com poses the ¿y and ^ /w ith , identical. The H D 74LS249 features active-low outputs de signed for driving indicators directly. All of the


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PDF HD74LS249 16-pin HD74LS49, D74LS249 D74LS 74LS249 T-90-10 74LSOO ib203 hd74ls pin HD74LS HD74LS49
74LS247

Abstract: ttl 74141 TTL 74ls247 75492 BCD TO 7-SEG DECODER MA5558 D143 D141 D135 74LS248
Text: 1.3 5.5 H — 125 D141 4L.6B, 9B 5 54LS/ 74LS249 7-Seg OC Decoder/Dvr TTL Yes Yes No 1.3 5.5 H — 40


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PDF mA2240 mA555 74LS247 ttl 74141 TTL 74ls247 75492 BCD TO 7-SEG DECODER MA5558 D143 D141 D135 74LS248
7SEG COM ANODE

Abstract: 7-seg 7-seg ANODE COMMON 7seg D143 TTL 74LS48 TTL 7446 decoder 74LS47 7448 decoder decoder 74LS48
Text: 54LS/ 74LS249 1.3 5.5 H X — 40 D141 4L.6B.9B 20 7-Seg LED Driver Common Cathode 9368 20 1.7 H X _ 225


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PDF 74LS48 74LS49 1-of-10 54LS/74LS47 54LS/74LS48 54LS/74LS49 54LS/74LS247 54LS/74LS248 54LS/74LS249 7SEG COM ANODE 7-seg 7-seg ANODE COMMON 7seg D143 TTL 74LS48 TTL 7446 decoder 74LS47 7448 decoder decoder 74LS48
dvr circuit diagram

Abstract: 74LS247 ttl 74141 TTL 74ls247 74LS248 74LS249 D141 75431 8T23 8T14
Text: 4L.6B, 9B 5 54LS/ 74LS249 7-Seg OC Decoder/Dvr TTL Yes Yes No 1.3 5.5 H — 40 D141 4L.6B, 9B 6 75491


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PDF
philips ecg master replacement guide

Abstract: ecg semiconductor replacement guide ECG SEMICONDUCTOR TRANSISTOR REPLACEMENT ECG TRANSISTOR REPLACEMENT GUIDE ecg replacement guide philips ecg replacement guide ic 74ls47 ecg semiconductors master replacement guide IC 74LS48
Text: 74LS248 IC-TTL Lo Pwr Schottky BCD-to-7-Segment D8 Decoder/Driver 74LS249 IC-TTL Lo Pwr Schottky


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PDF T-52-13-15 74C48 74C925 74LS47 philips ecg master replacement guide ecg semiconductor replacement guide ECG SEMICONDUCTOR TRANSISTOR REPLACEMENT ECG TRANSISTOR REPLACEMENT GUIDE ecg replacement guide philips ecg replacement guide ic 74ls47 ecg semiconductors master replacement guide IC 74LS48
74154

Abstract: TTL 74154 74LS47 74LS247 bcd 7448 ttl 7442 7447 ttl rbi rbo Fairchild 9319 93L11 TTL 7446
Text: FAIRCHILD LOGIC/CONNECTION DIAGRAMS DIGITAL -TTL D138 9311, 93L11, 54/74154 1819 23 22 21 20 E Ao Ai A2 A3 Oo Ol 02 Os O4 05 06 O7 Os O9 O10O11O12O13 O14O15 mTTTTTTTTTTTTT 1 2 3 4 S 6 7 8 9 10 11 13 14 15 16 17 Vcc = Pin 24 GND = Pin 12 D139 9319, 9320 TTTTTTTTTT 15 14 13 12 11 10 9 7 6 5 Vcc = Pin 16 GND = Pin 8 D140 9315 54/7441, 74141 D141 9307, 54/7448, 54LS/74LS48, 54LS/74LS248 54LS/ 74LS249 TTTTTTTTTT 16 15 8 9 13 14 11 10 1 2 Vcc = Pin 5 GND = Pin 12 7 1 2 6 3 5 I I I


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PDF 93L11, O10O11O12O13 O14O15 54LS/74LS48, 54LS/74LS248 54LS/74LS249 54LS/74LS49 9317B, 9317C, 54LS/74D135 74154 TTL 74154 74LS47 74LS247 bcd 7448 ttl 7442 7447 ttl rbi rbo Fairchild 9319 93L11 TTL 7446
philips ecg master replacement guide

Abstract: ecg semiconductor replacement guide 7-segment 74ls47 74C925 TRANSISTOR REPLACEMENT ECG philips ecg replacement guide ECG SEMICONDUCTOR ecg replacement guide ecg master replacement guide BCD-TO-7-SEGMENT DECODER
Text: Collector Output 74LS248 IC-TTL Lo Pwr Schottky BCD-to-7-Segment Decoder/Driver 74LS249 IC-TTL Lo Pwr


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PDF 74C48 74C925 10-Step philips ecg master replacement guide ecg semiconductor replacement guide 7-segment 74ls47 74C925 TRANSISTOR REPLACEMENT ECG philips ecg replacement guide ECG SEMICONDUCTOR ecg replacement guide ecg master replacement guide BCD-TO-7-SEGMENT DECODER
CI 7446

Abstract: CI 74141 cI 74ls47 CI 7447 CI 7448 TTL 7446 CI 74LS48 7-seg ANODE COMMON ci 7445 BCD D147
Text: 54LS/ 74LS249 1.3 5.5 H X — 40 D141 4L.6B.9B 20 7-Seg LED Driver Common Cathode 9368 20 1.7 H X _ 225


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PDF 93L14 54LS/74LS279 54LS/74LS75 93L08, 54LS/74LS77 54LS/74LS47 54LS/74LS48 54LS/74LS49 54LS/74LS247 54LS/74LS248 CI 7446 CI 74141 cI 74ls47 CI 7447 CI 7448 TTL 7446 CI 74LS48 7-seg ANODE COMMON ci 7445 BCD D147
decoder 7448

Abstract: BCD D147 D142 7448 decoder ttl 74ls48 mos 9368 9317B 7-seg 9317C decoder 74LS47
Text: /74LS49 54LS/74LS247 54LS/74LS248 54LS/ 74LS249 9368 9370 9374 70 70 16 80 80 11 80 96 70 40 20 40 40 12


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PDF 74LS48 74LS49 9317B 9317C 93L08, 54S/74S174, 54LS/74LS174 93L38 decoder 7448 BCD D147 D142 7448 decoder ttl 74ls48 mos 9368 7-seg decoder 74LS47
74LS247N

Abstract: IC 74LS247 74ls249n 74ls247 pin configuration bcd to seven segment circuit diagram 74LS247 74LS248 DM54LS47 DM74LS249 DM54LS49
Text: – Leading/trailing zero suppression 54LS249/ 74LS249 ■Open-collector outputs ■Lamp-test provision â , 7 I8 a gnd inputs 54LS249 (J) 74LS249 (N) 4-268 This Material Copyrighted By Its Respective


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PDF DM54LS247/DM74LS247, DM54LS248/DM74LS248, DM54LS249/ DM74LS249 DM54LS247/DM74LS247 DM54LS248/ DM74LS248 DM54LS47/DM74LS47 DM54LS48/DM74LS48, DM54LS249/DM74LS249 74LS247N IC 74LS247 74ls249n 74ls247 pin configuration bcd to seven segment circuit diagram 74LS247 74LS248 DM54LS47 DM54LS49
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