Cirrus Logic CS61884 - Manual

1
Copyright  Cirrus Logic, Inc. 2011
(All Rights Reserved)
http://www.cirrus.com
CS61884
Octal T1/E1/J1 Line Interface Unit
Features

Industry-standard Footprint

Octal E1/T1/J1 Short-haul Line Interface Unit

Low Power

No external component changes for 100
Ω/120 Ω/75 Ω
operation.

Pulse shapes can be customized by the user.

Internal AMI, B8ZS, or HDB3 Encoding/Decoding
 LOS Detection per T1.231, ITU G.775, 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 (<50mA)

TX Drivers with Fast High-Z and Power Down

JTAG boundary scan compliant to IEEE 1149.1.

144-Pin LQFP & 160-Pin LFBGA Packages
ORDERING INFORMATION
CS61884-IQZ 144-pin LQFP, Lead Free
CS61884-IRZ 160-pin LFBGA, Lead Free
Description
The CS61884 is a full-featured octal E1/T1/J1 short-haul
LIU that supports both 1.544 Mbps or 2.048 Mbps data
transmission. Each channel provides crystal-less jitter
attenuation that complies with the most stringent stan-
dards. Each channel also provides internal
AMI/B8ZS/HDB3 encoding/decoding. To support en-
hanced system diagnostics, channel zero can be
configured for G.772 non-intrusive monitoring of any of
the other 7 channels’ receive or transmit paths.
The CS61884 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. Additional-
ly, the internal line matching circuitry reduces the
external component count. All transmitters have controls
for independent power down and High-Z.
Each receiver provides reliable data recovery with over
12 dB of cable attenuation. The receiver also incorpo-
rates LOS detection compliant to the most recent
specifications.
RPOS
RNEG
TPOS
TNEG
TCLK
LOS
RTIP
RRING
TTIP
TRING
RCLK
0
1
7
JTAG Interface
Remot
e
Loopback
Digit
a
l Loopback
Analog Loopback
Decoder
Driver
Receiver
LOS
G.
772 Monit
o
r
Transmit
Control
Pulse
Shaper
Data
Recovery
Jitter
Attenuator
Clock
Recovery
Encoder
Host Interface
JTAG
Serial
Port Host
Serial/Parallel
Port
MAR ‘11
DS485F3