28 Telephone Line ICs 113

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Part	Manufacturer	Telecom IC Type	Temperature Grade	Terminal Form	No. of Terminals	Package Code	Package Shape	Package Body Material	Surface Mount	No. of Functions	Technology	Maximum Supply Current	Nominal Supply Voltage	Power Supplies (V)	Package Style (Meter)	Package Equivalence Code	Sub-Category	Terminal Pitch	Maximum Operating Temperature	Repertory	Minimum Operating Temperature	Terminal Finish	Terminal Position	JESD-30 Code	Moisture Sensitivity Level (MSL)	Maximum Seated Height	Width	Qualification	Additional Features	Crystal Frequency (MHz)	JESD-609 Code	Make-break Ratio	Length
MC34118DW	Motorola	SPEAKER PHONE CIRCUIT	COMMERCIAL	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR	8 mA	5 V	5	SMALL OUTLINE	SOP28,.5	Telephone Circuits	1.27 mm	60 Cel		-20 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0		17.9 mm
MC34118P	NXP Semiconductors	SPEAKER PHONE CIRCUIT	COMMERCIAL	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	BIPOLAR	8 mA	5 V	5	IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	60 Cel		-20 Cel	TIN LEAD	DUAL	R-PDIP-T28		5.08 mm	15.24 mm	Not Qualified			e0		36.83 mm
MC34118DWR2	Motorola	SPEAKER PHONE CIRCUIT	COMMERCIAL	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR	8 mA	5 V	5	SMALL OUTLINE	SOP28,.5	Telephone Circuits	1.27 mm	60 Cel		-20 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0		17.9 mm
MC34118DWR3	Motorola	SPEAKER PHONE CIRCUIT	COMMERCIAL	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1					SMALL OUTLINE			1.27 mm	60 Cel		-20 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified					17.9 mm
AS2533T	Ams Ag	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	.005 mA	5 V	3.8/5	SMALL OUTLINE	SOP28(UNSPEC)	Telephone Circuits		70 Cel		-25 Cel	MATTE TIN	DUAL	R-PDSO-G28	3			Not Qualified	SELECTABLE MAKE/BREAK RATIO 1:1.5		e3	1:2
L3916AN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	BIPOLAR		3 V	3	IN-LINE	DIP28,.6	Other Telecom ICs	2.54 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:1.5	36.83 mm
TEA7088AFP	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1					SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0		17.9 mm
L3934AD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR		3 V	3	SMALL OUTLINE	SOP28,.4	Other Telecom ICs	1.27 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:1.5	17.9 mm
L3936AN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	BIPOLAR		3 V	3	IN-LINE	DIP28,.6	Other Telecom ICs	2.54 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:1.5	36.83 mm
L3914AN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	BIPOLAR		3 V	3	IN-LINE	DIP28,.6	Other Telecom ICs	2.54 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:1.5	36.83 mm
ST3917BN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	CMOS	.0009 mA	3 V	3	IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	70 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:2	36.83 mm
L3924AD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR		3 V	3	SMALL OUTLINE	SOP28,.4	Other Telecom ICs	1.27 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:1.5	17.9 mm
L3926AD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR		3 V	3	SMALL OUTLINE	SOP28,.4	Other Telecom ICs	1.27 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:1.5	17.9 mm
TEA7037DP	STMicroelectronics		OTHER	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO		BIPOLAR	150 mA			IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	65 Cel		-25 Cel	Tin/Lead (Sn/Pb)	DUAL	R-PDIP-T28				Not Qualified			e0
TEA7031DP	STMicroelectronics	SPEAKER PHONE CIRCUIT	COMMERCIAL	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO		BIPOLAR	30 mA	2.9 V	2.9	IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	45 Cel		-5 Cel	Tin/Lead (Sn/Pb)	DUAL	R-PDIP-T28				Not Qualified			e0
TEA7031FP	STMicroelectronics	SPEAKER PHONE CIRCUIT	COMMERCIAL	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES		BIPOLAR	30 mA	2.9 V	2.9	SMALL OUTLINE	SOP28,.5	Telephone Circuits	1.27 mm	45 Cel		-5 Cel	Tin/Lead (Sn/Pb)	DUAL	R-PDSO-G28				Not Qualified			e0
L3916AD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR		3 V	3	SMALL OUTLINE	SOP28,.4	Other Telecom ICs	1.27 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:1.5	17.9 mm
L3926AN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	BIPOLAR		3 V	3	IN-LINE	DIP28,.6	Other Telecom ICs	2.54 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:1.5	36.83 mm
L3914AD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR		3 V	3	SMALL OUTLINE	SOP28,.4	Other Telecom ICs	1.27 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:1.5	17.9 mm
ST3917AD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	.0009 mA	3 V	3	SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:1.5	17.9 mm
ST3917BD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	.0009 mA	3 V	3	SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:2	17.9 mm
L3924AN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	BIPOLAR		3 V	3	IN-LINE	DIP28,.6	Other Telecom ICs	2.54 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:1.5	36.83 mm
TEA7089AFP	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1					SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0		17.9 mm
L3934AN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	BIPOLAR		3 V	3	IN-LINE	DIP28,.6	Other Telecom ICs	2.54 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:1.5	36.83 mm
TEA7540DP	STMicroelectronics	TELEPHONE SPEECH CIRCUIT	COMMERCIAL	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1			3 V		IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	70 Cel		-20 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0		36.83 mm
TEA7540FP	STMicroelectronics	TELEPHONE SPEECH CIRCUIT	COMMERCIAL	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1		.003 mA	3 V	3	SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel		-20 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e4		17.9 mm
L3936AD	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	BIPOLAR		3 V	3	SMALL OUTLINE	SOP28,.4	Other Telecom ICs	1.27 mm	75 Cel		-25 Cel	TIN LEAD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified			e0	1:1.5	17.9 mm
ST3917AN	STMicroelectronics	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	CMOS	.0009 mA	3 V	3	IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	70 Cel		-25 Cel	TIN LEAD	DUAL	R-PDIP-T28			15.24 mm	Not Qualified			e0	1:1.5	36.83 mm
PCD3332-ST	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	1.8 mA	5 V	3/5	SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel	REPERTORY	-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 3:2	3.58		2:1	17.9 mm
PCD3310ET	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1		.2 mA	3 V		SMALL OUTLINE			1.27 mm	70 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified				1:2	17.9 mm
PCD3315P	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1					IN-LINE			2.54 mm	70 Cel		-25 Cel		DUAL	R-PDIP-T28		5.1 mm	15.24 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 2:1			3:2	35.5 mm
PCD3310T-T	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1		.9 mA	5 V		SMALL OUTLINE			1.27 mm	70 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified				1:1.5	17.9 mm
PCD3330-1T	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	1.6 mA	5 V	1.8/6	SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel	REPERTORY	-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 3:2	3.58		2:1	17.9 mm
935260608112	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1			3.6 V		SMALL OUTLINE			1.27 mm	75 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified				2:3	17.9 mm
PCD3330-1P	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	CMOS	1.6 mA	5 V	1.8/6	IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	70 Cel	REPERTORY	-25 Cel		DUAL	R-PDIP-T28		5.1 mm	15.24 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 3:2	3.58		2:1	35.5 mm
PCD3332-1T-T	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1					SMALL OUTLINE			1.27 mm	70 Cel		-25 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 2:1		e4	3:2	17.9 mm
PCD3344T/011	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1			5 V		SMALL OUTLINE			1.27 mm	70 Cel		-25 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 2:1		e4	3:2	17.9 mm
PCD3310CT	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1		.2 mA	3 V		SMALL OUTLINE			1.27 mm	70 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified				1:2	17.9 mm
PCD3332-2T-T	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	1.8 mA	5 V		SMALL OUTLINE			1.27 mm	70 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 3:2			2:1	17.9 mm
UBA2051T/C1	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1			3.6 V		SMALL OUTLINE			1.27 mm	75 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified				2:3	17.9 mm
PCD3332-3T	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	1.8 mA	5 V	3/5	SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel	REPERTORY	-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 3:2	3.58		2:1	17.9 mm
PCD3332-SP	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	OTHER	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1	CMOS	1.8 mA	5 V	3/5	IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	70 Cel	REPERTORY	-25 Cel		DUAL	R-PDIP-T28		5.1 mm	15.24 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 3:2	3.58		2:1	35.5 mm
935260607112	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1			3.6 V		SMALL OUTLINE			1.27 mm	75 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified				2:3	17.9 mm
PCD3344P/047	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1			5 V		IN-LINE			2.54 mm	70 Cel		-25 Cel	TIN/NICKEL PALLADIUM GOLD	DUAL	R-PDIP-T28		5.1 mm	15.24 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 2:1		e3/e4	3:2	35.5 mm
PCD3349T/018	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1			5 V		SMALL OUTLINE			1.27 mm	70 Cel		-25 Cel	NICKEL PALLADIUM GOLD	DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified	SELECTABLE MAKE/BREAK RATIO 2:1		e4	3:2	17.9 mm
PCD3310AT	NXP Semiconductors	TELEPHONE DIALER CIRCUIT	OTHER	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1	CMOS	.9 mA	5 V	3/5	SMALL OUTLINE	SOP28,.4	Telephone Circuits	1.27 mm	70 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified		3.58		1:1.5	17.9 mm
UBA1702	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	THROUGH-HOLE	28	DIP	RECTANGULAR	PLASTIC/EPOXY	NO	1		2 mA	3.3 V	3.3	IN-LINE	DIP28,.6	Telephone Circuits	2.54 mm	75 Cel		-25 Cel		DUAL	R-PDIP-T28		5.1 mm	15.24 mm	Not Qualified					35.5 mm
935260690112	NXP Semiconductors	TELEPHONE MULTIFUNCTION CIRCUIT	COMMERCIAL EXTENDED	GULL WING	28	SOP	RECTANGULAR	PLASTIC/EPOXY	YES	1			3.6 V		SMALL OUTLINE			1.27 mm	75 Cel		-25 Cel		DUAL	R-PDSO-G28		2.65 mm	7.5 mm	Not Qualified				2:3	17.9 mm

Telephone Line ICs

Telephone Line ICs are electronic components used in telephone systems to interface with the telephone line and provide necessary functionality for telephone communication. These ICs are designed to provide reliable and efficient operation of the telephone line, allowing for clear and uninterrupted communication between two devices.

Telephone Line ICs use various techniques to interface with the telephone line, including pulse dialing, dual-tone multi-frequency (DTMF) signaling, and loop current sensing. Pulse dialing is used to send a series of electrical pulses over the telephone line to dial a phone number. DTMF signaling is used to send a sequence of tones to control various telephone functions, such as call forwarding and call waiting. Loop current sensing is used to detect the presence of a telephone off-hook condition, allowing the telephone system to provide appropriate signaling and call management.

Some common features of Telephone Line ICs include:

1. Telephone line interface: Telephone Line ICs provide the necessary interface with the telephone line to enable telephone communication.

2. Signal processing: Telephone Line ICs are designed to process signals quickly and efficiently, ensuring clear and uninterrupted communication.

3. Tone generation and detection: Telephone Line ICs can generate and detect various tones used for telephone communication, such as dial tones and busy signals.

4. Call management: Telephone Line ICs can provide call management functions, such as call waiting and call forwarding.

Telephone Line ICs are used in a variety of telephone systems, including traditional landline phones, cordless phones, and PBX (Private Branch Exchange) systems. They are also used in other communication systems that require telephone line interface, such as alarm systems and security systems.