User:Sbmeirow/Sandbox6

Article Name = Seven-segment decoder (maybe)

TODO

In the past, some seven-segment decoder ICs did not output the following modern decimal/hexadecimal font.

0 1 2 3 4 5 6 7 8 9 A b C d E F

• For "1", the MC14558B displays the number on the left side of the display using segments "e" and "f" instead of the usual "b" and "c".^[1]
• For "7", the TC5022B displays it with additional segment "f".^[2]
• For "6" and "9", the CD4511B, MC14558B, TC5002B, SN74x46/SN74x47/SN74x48/SN74x49 displays both numbers without a "tail", where "x" is the TTL logic family.
• For "A" to "F":

• BCD decoder ICs support various seven-segment fonts for their decoded output of "A" (10) to "F" (15) inputs.
• The 7446/7447/7448/7449 ^[3] and the Siemens FLH551-7448/555-8448 chips used truncated versions of "2", "3", "4", "5" and "6" for digits A–E. Digit F (1111 binary) was blank.^{[4] [5]}
• The TC5002B and TC5022B repeat the numbers 0 to 5 for digits A–F.^[2]
• The MM74C912 displayed "o" for A and B, "−" for C, D, and E, and blank for F.^[6] The CD4511B just displayed blanks.^[7]
• Soviet programmable calculators like the Б3–34 used the symbols "−", "L", "C", "Г", "E", and " " (space), allowing the error message EГГ0Г to be displayed.

Manufacturer	Part Number	Production	Description	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F	Output	Datasheet
TI	SN74LS47	Active (TI)	BCD Decoder	0	1	2	3	4	5	6	7	8	9	c	a	v*	D	t	sp	Active-Low, OC	[3]
TI	SN74LS247	Active (TI)	BCD Decoder	0	1	2	3	4	5	6	7	8	9	c	a	v*	D	t	sp	Active-Low, OC	[8]
Motorola	MC14558B	Discontinued	BCD Decoder	0	1*	2	3	4	5	6	7	8	9	sp	sp	sp	sp	sp	sp	Active-High, PP	[1]
Toshiba	TC5002B	Discontinued	BCD Decoder	0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	Active-High, OE	[2]
Toshiba	TC5022B	Discontinued	BCD Decoder	0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	Active-High, OE	[2]
RCA TI	CD4511B CD74x4511	Active (TI)	BCD Decoder, Latch	0	1	2	3	4	5	6	7	8	9	sp	sp	sp	sp	sp	sp	Active-High, PP	[7] [9]
RCA TI	CD4543B CD74x4543	Active (TI)	BCD Decoder, Latch	0	1	2	3	4	5	6	7	8	9	sp	sp	sp	sp	sp	sp	Active-High or Low, PP	[10] [11]
National	DM9374	Discontinued	BCD Decoder, Latch	0	1	2	3	4	5	6	7	8	9	-	E	H	L	P	sp	Active Low, CC	[12]
National	DM9368	Discontinued	Hex Decoder, Latch	0	1	2	3	4	5	6	7	8	9	A	b	C	d	E	F	Active High, CC	[13]
National	DM9370	Discontinued	Hex Decoder, Latch	0	1	2	3	4	5	6	7	8	9	A	b	C	d	E	F	Active Low, OC	[14]
Motorola	MC14495-1	Discontinued	Hex Decoder, Latch	0	1	2	3	4	5	6	7	8	9	A	b	C	d	E	F	Active-High, OE	[15]
National	MM74C912	Discontinued	6-Digit BCD Controller	0	1	2	3	4	5	6	7	8	9	o	°	̅	-	_	sp	Active-High, PP	[6]
National	MM74C917	Discontinued	6-Digit Hex Controller	0	1	2	3	4	5	6	7	8	9	A	b	C	d	E	F	Active-High, PP	[6]
RCA	CD4026B	Active (TI)	BCD Counter, Up	0	1	2	3	4	5	6	7	8	9							Active-High, PP	[16]
RCA	CD4033B	Active (TI)	BCD Counter, Up	0	1	2	3	4	5	6	7	8	9							Active-High, PP	[16]
RCA	CD40110B	Active (TI)	BCD Counter, Up/Down	0	1	2	3	4	5	6	7	8	9							Active-High, PP	[17]
TI	SN74LS48	Discontinued	BCD Decoder	0	1	2	3	4	5	6	7	8	9	c	a	v*	D	t	sp	Active-High, OC, 2K	?
TI	SN74LS248	Discontinued	BCD Decoder	0	1	2	3	4	5	6	7	8	9	c	a	v*	D	t	sp	Active-High, OC, 2K	?
RCA	CD4055B	Discontinued*	BCD Decoder	0	1	2	3	4	5	6	7	8	9	?	?	?	?	?	?	?	?
RCA	CD4056B	Active (TI)	BCD Decoder, Latch	0	1	2	3	4	5	6	7	8	9	?	?	?	?	?	?	?	?
Template	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?

Table notes

• All information in the above table was pulled from references in the datasheet column, except where denoted below.
• For the "Manufacturer" column, lists the name of the first (original) manufacturer of the part.
• For the "Part Number" column, the "x" in part numbers means logic family, such as "HC" or "HCT".
• For the "Production" column, "Active" status from Texas Instruments (TI) website, "Discontinued" status was derived by new parts not being available from major distributors, though new old stock (NOS) may be available from specialized sellers.
• For the "Output" column, "Active-High" means a high (1) occurs when a segment is on; "Active-Low" means a low (0) occurs when a segment is on; "OC" means open collector (drives low); "OE" means open emitter (drives high); "PP" means push-pull (drives high & low), "CC" means constant current.

TODO

Table notes

• For the "0" to "F" columns,

• each 4-bit input is shown as its 7-segment decoded output.

• For the "Output" column,

• Active-High means a high occurs when a segment is on, where as Active-Low means a low occurs when a segment is on.
• PP means Push-Pull output driver, OC means Open-Collector output driver, OE means Open-Emitter output driver, CC means Constant Current output driver.

• For the "Manufacturer" column,

• TODO: RCA --> GE & Intersil --> Harris --> Renesas --> Intersil was sold to Renesas Electronics in 2017.^[18]
• Motorola Semiconductor Components Group was spun into ON Semiconductor in 1999.^[19]
• National Semiconductor was sold to Texas Instruments in 2011.^[20]

IDEAS

• Maybe add new notes column, so can migrate text from top (summary of differences) into columns ???

• Maybe add new column for LED or LCD

• Maybe add new columns for other pin features

• Finish manufacturer historical list.

• Maybe describe outputs. Output for 0 / 2 / 3 / 4 / 5 / 8 are the same for all ICs. MC14558B has a different output for 1. TC5022 has a different output for 7. Output for 6 & 9 vary across the ICs.

DISCUSSIONS

• https://old.reddit.com/r/AskElectronics/comments/1nm5vwy/looking_for_a_74ls47_equivalent_for_an_lcd_panel/

• https://old.reddit.com/r/AskElectronics/comments/1or5wcj/are_there_bcd_to_7segmentdisplaydrivers_with_a/

TODO

• "File:BCD 7 display.jpg"
• 2 bit binary to (0 to 3) 7seg decoder circuits
• 3 bit binary to (0 to 7) 7seg decoder circuits
• 4 bit binary to (0 to 9) 7seg decoder circuits
• 4 bit binary to (0 to F) 7seg decoder circuits
• Other decoding methods: diode matrix, SPLD/CPLD, FPGA, ROM/EPROM/EEPROM, MCU
• Other methods for MCU: shift register, parallel driver.

• Binary decoder
• 4000 series, List of 4000 series integrated circuits
• 7400 series, List of 7400 series integrated circuits

• Noindexed pages