ISL5585

Features:


. 3.3V Operation
. Onboard Ringing Generation
. Low Standby Power Consumption (75V, 65mW)
. Programmable Transient Current Limit
. Improved Off Hook Software Interface
. Integrated MTU DC Characteristics
. Low External Component Count
. Silent Polarity Reversal
. Pulse Metering and On Hook Transmission
. Tip Open Ground Start Operation
. Balanced and Unbalanced Ringing
. Thermal Shutdown with Alarm Indicator
. 28 Lead Surface Mount Packaging
. Reduced Footprint Quad Flatpack No-lead (QFN) Packaging




Application

. Short Loop Access Platforms
. Voice Over Internet Protocol (VoIP)
. Voice Over Cable and DSL Modems
. Internet Protocol PBX
. FiberTo The Home (FTTH)
. Remote Subscriber Units
. Ethernet Terminal Adapters

Pinout






Specifications

PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNITS
RINGING PARAMETERS
VRS	Input Impedance (Note 3)	450	-	-	kΩ
Differential Ringing Gain (Note 4)	Balanced Ringing, VRS to 2-Wire, RLOAD=	78	80	82	V/V
	Unbalanced Ringing, VRS to 2-Wire, RLOAD=	38	40	42	V/V
Centering Voltage Accuracy	Tip, Referenced to VBH/2 + 0.5 (Note 9)	-	±2.5	-	V
	Ring, Referenced to VBH/2 + 0.5	-	±2.5	-	V
Open Circuit Ringing Voltage	Balanced Ringing, VRS Input=0.840VRMS	-	67	-	VRMS
	Unbalanced Ringing, VRS Input=0.840VRMS	-	33.5	-	VRMS
Ringing Voltage Total Distortion	RL=1.3 kΩ, VT-R=|VBH| -5	-	-	4.0	%
4-Wire to 2-Wire Ringing Off Isolation	Active Mode, Referenced to VRS Input	-	90	-	dB
2-Wire to 4-Wire Transmit Isolation	Ringing Mode Referenced to the Differential Ringing Amplitude	-	80	-	dB
AC TRANSMISSION PARAMETERS
Auxiliary Input Impedance (Note 3)		160	-	-	kΩ
Transmit Output Impedance (Note 3)		-	-	1	Ω
4-Wire Port Overload Level	THD=1%	-	1.0	-	KVP
2-Wire Port Overload Level	THD=1%	3.1	3.5	-	VPK

Description

The 3.3V family of ringing subscriber line interface circuits (SLIC) supports analog Plain Old Telephone Service (POTS) in short and medium loop length, wireless and wireline voice over broadband applications. Ideally suited for customer premise equipment, this family of products offers flexibility to designers with high ringing voltage and low power consumption system requirements. The ISL5585 family is capable of operating with 100V ringing battery supply, which translates directly to the amount of ringing voltage supplied to the subscriber. With the high operating voltage, subscriber loop lengths can be extended to 500 (i.e., 5,000 feet) and beyond, allowing this family to serve emerging Fiber In The Loop (FITL) markets. Other key features across the product family include: 3.3V VCC operation, low power consumption, ringing using sinusoidal or trapezoidal waveforms, robust auto-detection mechanisms for when subscribers go on or off hook, and minimal external discrete application components. Integrated test access features are also offered on selected products to support loopback testing as well as line measurement tests. There are ten product offerings of the ISL5585 providing various grades of ringing battery voltage and longitudinal balance.