CS61880

Features:

`Octal E1 Short-haul Line Interface Unit 􀀀
`Low Power 􀀀
`No External Component Changes for 120 / 75 Operation 􀀀
`Pulse Shapes can be customized by the user 􀀀
`Internal AMI, or HDB3 Encoding/Decoding 􀀀
`LOS Detection per ITU G.775 or ETSI 300- 233 􀀀
`G.772 Non-Intrusive Monitoring 􀀀
`G.703 BITS Clock Recovery 􀀀
`Crystal-less Jitter Attenuation 􀀀
`Serial/Parallel Microprocessor Control Interfaces 􀀀
`Transmitter Short Circuit Current Limiter (<50 mA) 􀀀
`TX Drivers with Fast High-Z and Power Down 􀀀
`JTAG Boundary Scan compliant to IEEE 1149.1 􀀀
`144-Pin LQFP or 160-Pin FBGA Package




Pinout






Specifications

Parameter	Symbol	Min.	Max	Units
DC Supply (referenced to RGND = TGND = 0V)	RV+ TV+	- -	4.0 4.0	V V
DC Supply	VCCIO	-0.5	4.6	V
Input Voltage, Any Digital Pin except CBLSEL, MODE and LOOP(n) pins (referenced to GNDIO = 0V)	VIH	GNDIO -0.5	5.3	V
Input Voltage CBLSEL, MODE & LOOP(n) Pins (referenced to GNDIO = 0V)	VIH	GNDIO -0.5	VCCIO +0.5	V
Input voltage, RTIP and RRING Pins		TGND -0.5	TV+ +0.5	V
ESD voltage, Any pin Note 1		2k	-	V
Input current, Any Pin Note 2	IIH	-10	+10	mA
Maximum Power Dissipation, In package	Pp	-	1.73	W
Ambient Operating Temperature	TA	-40	85	C
Storage Temperature	Tstg	-65	150	C

Description

The CS61880 is a full-featured octal E1 short-haul line interface unit that supports 2.048 Mbps data transmission for both 75 and 120 applications. Each channel provides crystal-less jitter attenuation that complies with the most stringent standards. Each channel also provides internal AMI/HDB3 encoding/decoding. To support enhanced system diagnostics, channel zero can be configured for G.772 non-intrusive monitoring the receive or transmit paths for any of the seven channels.

The CS61880 makes use of ultra-low-power matched-impedance transmitters and receivers to reduce power beyond that achieved by traditional driver designs. By achieving a more precise line match, this technique also provides superior return loss characteristics. Additionally, the internal line matching circuitry reduces the external component count. All transmitters have controls for independent power down and High-Z.

Each receiver CS61880 provides reliable data recovery with over 12 dB of cable attenuation. The receiver also incorporates loss-of-signal (LOS) detection that is compliant to the most recent specifications.