DIE Digital Counters 99

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Part	Manufacturer	Logic IC Type	Temperature Grade	Terminal Form	No. of Terminals	Package Code	Package Shape	Package Body Material	Surface Mount	No. of Functions	Maximum Frequency At Nominal Supply	Technology	No. of Bits	Load or Preset Input	Packing Method	Nominal Supply Voltage / Vsup (V)	Load Capacitance (CL)	Package Style (Meter)	Operation Mode	Propagation Delay (tpd)	Maximum I (ol)	Maximum Operating Temperature	Count Direction	Trigger Type	Minimum Operating Temperature	Terminal Position	Minimum fmax	JESD-30 Code	Maximum Supply Voltage (Vsup)	Qualification	Minimum Supply Voltage (Vsup)	Maximum Power Supply Current (ICC)	Additional Features	Maximum Time At Peak Reflow Temperature (s)	Peak Reflow Temperature (C)	Family
CD54ACT163H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	UNSPECIFIED	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	16.5 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	80 MHz	X-XUUC-N16	5.5 V	Not Qualified	4.5 V		TCO OUTPUT			AC
CD54HCT190H	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	53 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	20 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V		TCO OUTPUT			HCT
CD54HCT191H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	53 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	20 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V		TCO OUTPUT			HCT
CD54AC163H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	UNSPECIFIED	UNSPECIFIED	YES	1		CMOS	4	YES				UNCASED CHIP	SYNCHRONOUS	207 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	90 MHz	X-XUUC-N16	5.5 V	Not Qualified	1.5 V		TCO OUTPUT			AC
CD54HC190H	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		4.5		UNCASED CHIP	SYNCHRONOUS	255 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	23 MHz	R-XUUC-N16	6 V	Not Qualified	2 V		TCO OUTPUT			HC/UH
CD54HCT4510H	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	75 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	20 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V					HCT
CD54HC4516H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		4.5		UNCASED CHIP	SYNCHRONOUS	330 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	24 MHz	R-XUUC-N16	6 V	Not Qualified	2 V					HC/UH
CD54HC191H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		4.5		UNCASED CHIP	SYNCHRONOUS	255 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	23 MHz	R-XUUC-N16	6 V	Not Qualified	2 V		TCO OUTPUT			HC/UH
CD54HC4510H	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		4.5		UNCASED CHIP	SYNCHRONOUS	330 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	24 MHz	R-XUUC-N16	6 V	Not Qualified	2 V					HC/UH
CD54ACT161H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	UNSPECIFIED	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	16.5 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	80 MHz	X-XUUC-N16	5.5 V	Not Qualified	4.5 V		TCO OUTPUT			AC
CD54HCT4516H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	75 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	20 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V					HCT
CD54AC161H	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	UNSPECIFIED	UNSPECIFIED	YES	1		CMOS	4	YES				UNCASED CHIP	SYNCHRONOUS	207 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	90 MHz	X-XUUC-N16	5.5 V	Not Qualified	1.5 V		TCO OUTPUT			AC
CD54HC4017H	Texas Instruments	RING COUNTER	MILITARY	NO LEAD		DIE	UNSPECIFIED	UNSPECIFIED	YES	1		CMOS	10	YES		4.5		UNCASED CHIP	SYNCHRONOUS	345 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	23 MHz	X-XUUC-N	6 V	Not Qualified	2 V					HC/UH
CD74HCT4516H	Texas Instruments	BINARY COUNTER	INDUSTRIAL	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	63 ns		85 Cel	BIDIRECTIONAL	POSITIVE EDGE	-40 Cel	UPPER	24 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V					HCT
CD4033BH	Texas Instruments	DISPLAY DRIVER COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	5	YES		5		UNCASED CHIP	SYNCHRONOUS	700 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	8 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		JOHNSON COUNTER			4000/14000/40000
CD74HC4516H	Texas Instruments	BINARY COUNTER	INDUSTRIAL	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		4.5		UNCASED CHIP	SYNCHRONOUS	275 ns		85 Cel	BIDIRECTIONAL	POSITIVE EDGE	-40 Cel	UPPER	28 MHz	R-XUUC-N16	6 V	Not Qualified	2 V					HC/UH
CD40161BH	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	400 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	8 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO OUTPUT			4000/14000/40000
CD4520BH	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	2		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	560 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	4 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		GATED CLOCK; SCHMITT TRIGGER ON CLOCK INPUT			4000/14000/40000
CD4510BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	400 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	5.5 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO OUTPUT			4000/14000/40000
CD4518BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	2		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	560 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	4 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		GATED CLOCK; SCHMITT TRIGGER ON CLOCK INPUT			4000/14000/40000
CD40102BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	8	YES		5		UNCASED CHIP	SYNCHRONOUS	600 ns		125 Cel	DOWN	POSITIVE EDGE	-55 Cel	UPPER	2.4 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO OUTPUT; RESET TO MAX COUNT			4000/14000/40000
CD4017BH	Texas Instruments	RING COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	10	YES		5		UNCASED CHIP	SYNCHRONOUS	650 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	5.5 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		JOHNSON COUNTER WITH 8 DECODED OUTPUTS			4000/14000/40000
CD4018BH	Texas Instruments	RING COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	5	YES		5		UNCASED CHIP	SYNCHRONOUS	400 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	8.5 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		JOHNSON COUNTER, PROGRAMMABLE WITH EXT CONNECTIONS			4000/14000/40000
SN54HC191TDE2	Texas Instruments	BINARY COUNTER		NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1	14000000 Hz	CMOS	4		TUBE		50 pF	UNCASED CHIP	SYNCHRONOUS		5.2 Amp		BIDIRECTIONAL	POSITIVE EDGE		UPPER		R-XUUC-N16	6 V		2 V	.08 mA		NOT SPECIFIED	NOT SPECIFIED	HC
CD74HCT4510H	Texas Instruments	DECADE COUNTER	INDUSTRIAL	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	63 ns		85 Cel	BIDIRECTIONAL	POSITIVE EDGE	-40 Cel	UPPER	24 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V					HCT
CD4045BH	Texas Instruments	DIVIDE BY N COUNTER	MILITARY	NO LEAD	8	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	21	YES		5		UNCASED CHIP	SYNCHRONOUS	5500 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	15 MHz	R-XUUC-N8	18 V	Not Qualified	3 V					4000/14000/40000
CD4527BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	220 ns		125 Cel	UP	NEGATIVE EDGE	-55 Cel	UPPER	3.5 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		BCD RATE MULTIPLIER; COMPLEMENTARY OUTPUTS			4000/14000/40000
CD4522BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	1100 ns		125 Cel	DOWN	POSITIVE EDGE	-55 Cel	UPPER	4 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO OUTPUT; GATED CLOCK			4000/14000/40000
CD4040BH	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	12	YES		5		UNCASED CHIP	ASYNCHRONOUS	360 ns		125 Cel	UP	NEGATIVE EDGE	-55 Cel	UPPER	12 MHz	R-XUUC-N16	18 V	Not Qualified	3 V					4000/14000/40000
CD4022BH	Texas Instruments	RING COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	10	YES		5		UNCASED CHIP	SYNCHRONOUS	650 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	5.5 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		JOHNSON COUNTER WITH 8 DECODED OUTPUTS			4000/14000/40000
CD40103B	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	8	YES		5		UNCASED CHIP	SYNCHRONOUS	600 ns		125 Cel	DOWN	POSITIVE EDGE	-55 Cel	UPPER	2.4 MHz	R-XUUC-N16	18 V	Not Qualified	3 V					4000/14000/40000
CD74HCT190H	Texas Instruments	DECADE COUNTER	INDUSTRIAL	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	44 ns		85 Cel	BIDIRECTIONAL	POSITIVE EDGE	-40 Cel	UPPER	25 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V		TCO OUTPUT			HCT
CD4521BH	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	24	YES		5		UNCASED CHIP	ASYNCHRONOUS	12000 ns		125 Cel	UP	NEGATIVE EDGE	-55 Cel	UPPER	6.5 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		OUTPUTS FROM LAST 7 STAGES AVAILABLE			4000/14000/40000
CD74HCT191H	Texas Instruments	BINARY COUNTER	INDUSTRIAL	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	44 ns		85 Cel	BIDIRECTIONAL	POSITIVE EDGE	-40 Cel	UPPER	25 MHz	R-XUUC-N16	5.5 V	Not Qualified	4.5 V		TCO OUTPUT			HCT
CD74HC190H	Texas Instruments	DECADE COUNTER	INDUSTRIAL	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		4.5		UNCASED CHIP	SYNCHRONOUS	215 ns		85 Cel	BIDIRECTIONAL	POSITIVE EDGE	-40 Cel	UPPER	29 MHz	R-XUUC-N16	6 V	Not Qualified	2 V		TCO OUTPUT			HC/UH
CD40192BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	500 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	11 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO UP AND TCO DOWN OUTPUTS; SEPARATE UP/DOWN CLOCK			4000/14000/40000
SN54HC191TDE1	Texas Instruments	BINARY COUNTER		NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1	14000000 Hz	CMOS	4		TUBE		50 pF	UNCASED CHIP	SYNCHRONOUS		5.2 Amp		BIDIRECTIONAL	POSITIVE EDGE		UPPER		R-XUUC-N16	6 V		2 V	.08 mA		NOT SPECIFIED	NOT SPECIFIED	HC
CD40162BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	400 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	8 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO OUTPUT			4000/14000/40000
CD40102B	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	8	YES		5		UNCASED CHIP	SYNCHRONOUS	600 ns		125 Cel	DOWN	POSITIVE EDGE	-55 Cel	UPPER	2.4 MHz	R-XUUC-N16	18 V	Not Qualified	3 V					4000/14000/40000
CD4026BH	Texas Instruments	DISPLAY DRIVER COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	5	YES		5		UNCASED CHIP	SYNCHRONOUS	700 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	8 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		JOHNSON COUNTER			4000/14000/40000
CD4024BH	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	14	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	7	YES		5		UNCASED CHIP	ASYNCHRONOUS	360 ns		125 Cel	UP	NEGATIVE EDGE	-55 Cel	UPPER	24 MHz	R-XUUC-N14	18 V	Not Qualified	3 V		OUTPUTS FROM 12 STAGES AVAILABLE			4000/14000/40000
SN74LS90-W	Texas Instruments	DECADE COUNTER	COMMERCIAL	NO LEAD		DIE	UNSPECIFIED	UNSPECIFIED	YES	2		TTL	3	YES		5		UNCASED CHIP	ASYNCHRONOUS	50 ns		70 Cel	UP	NEGATIVE EDGE	0 Cel	UPPER	32 MHz	X-XUUC-N	5.25 V		4.75 V					LS
CD40160BH	Texas Instruments	DECADE COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		5		UNCASED CHIP	SYNCHRONOUS	400 ns		125 Cel	UP	POSITIVE EDGE	-55 Cel	UPPER	8 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO OUTPUT			4000/14000/40000
CD4020BH	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	14	YES		5		UNCASED CHIP	ASYNCHRONOUS	360 ns		125 Cel	UP	NEGATIVE EDGE	-55 Cel	UPPER	24 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		OUTPUTS FROM 12 STAGES AVAILABLE			4000/14000/40000
CD74HC191H	Texas Instruments	BINARY COUNTER	INDUSTRIAL	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	4	YES		4.5		UNCASED CHIP	SYNCHRONOUS	215 ns		85 Cel	BIDIRECTIONAL	POSITIVE EDGE	-40 Cel	UPPER	29 MHz	R-XUUC-N16	6 V	Not Qualified	2 V		TCO OUTPUT			HC/UH
CD4541BH	Texas Instruments	BINARY COUNTER		NO LEAD	12	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS						UNCASED CHIP								UPPER		R-XUUC-N12		Not Qualified						4000/14000/40000
CD4059AH	Texas Instruments	DIVIDE BY N COUNTER	MILITARY	NO LEAD	24	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS		YES		5		UNCASED CHIP	ASYNCHRONOUS	360 ns		125 Cel	BIDIRECTIONAL	POSITIVE EDGE	-55 Cel	UPPER	3 MHz	R-XUUC-N24	12 V	Not Qualified	3 V		PROGRAMMABLE TO DIVIDE INPUT BY 3-15999; SCHMITT TRIGGER ON CLOCK INPUT; WITH OUTPUT LATCH			4000/14000/40000
CD40103BH	Texas Instruments	BINARY COUNTER	MILITARY	NO LEAD	16	DIE	RECTANGULAR	UNSPECIFIED	YES	1		CMOS	8	YES		5		UNCASED CHIP	SYNCHRONOUS	600 ns		125 Cel	DOWN	POSITIVE EDGE	-55 Cel	UPPER	2.4 MHz	R-XUUC-N16	18 V	Not Qualified	3 V		TCO OUTPUT; RESET TO MAX COUNT			4000/14000/40000

Digital Counters

Digital counters are electronic circuits that can be used to count and keep track of the number of events or occurrences in a digital system. They are commonly used in digital systems to generate timing signals, to control sequencing, and to implement digital control functions.

Digital counters can be designed using various technologies, including transistor-transistor logic (TTL), complementary metal-oxide-semiconductor (CMOS), and field-programmable gate arrays (FPGAs). They can also be designed using various types of flip-flops, such as D flip-flops, JK flip-flops, and T flip-flops.

Digital counters can be classified into two main types: synchronous counters and asynchronous counters. Synchronous counters use a common clock signal to synchronize the operation of all the flip-flops in the counter. Asynchronous counters, on the other hand, do not use a common clock signal and rely on the propagation delay of the flip-flops to sequence their operation.

Digital counters can also be classified based on their counting sequence. They can count up, down, or both up and down, depending on the application. Up counters increment the count each time an input pulse is received, while down counters decrement the count each time an input pulse is received. Up-down counters can count both up and down, depending on the direction of the input signal.

Digital counters can be used in various applications, including frequency division, time delay generation, event counting, and sequence control. They can be used to generate timing signals for clocking digital circuits, to control the sequencing of operations in a digital system, and to implement digital control functions, such as shift registers and sequence generators.