Rainbow Electronics DS2188 - Manual

E Copyright 1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
DS2188
T1/CEPT Jitter Attenuator
DS2188
* Service mark of AT&T Communications
021997 1/11
FEATURES
•
Attenuates clock and data jitter present in T1 or CEPT
lines
•
Meets the jitter attenuation templates outlined in
TR62411, TR–TSY–000170, G.735, and G.742
•
Only one external component required; either a 6.176
MHz (T1) or 8.192 MHz (CEPT) crystal
•
Selectable buffer size of 128 or 32 bits
•
Jitter attenuation is easily disabled
•
Single +5V supply; low–power CMOS technology
•
Available in 16–pin DIP and 16–pin SOIC (DS2188S)
•
Companion to the DS2186 Transmit Line and
DS2187 Receive Line Interfaces
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RST
DJA
RPOS
RNEG
RCLK
BDS
TEST
XTAL OUT
VSS
VDD
RRPOS
RRNEG
RRCLK
BL
XTAL2
XTAL1
16–PIN DIP/SOIC
DESCRIPTION
The DS2188 T1/CEPT Jitter Attenuator Chip contains a
128 X 2–bit buffer which, in conjunction with an external
4X crystal, is used to attenuate the incoming jitter pres-
ent in clock and data. The device meets all of the latest
applicable specifications including those outlined in TR
62411 (Accunet* T1.5 Service Description and Interface
Specifications, December 1990), TR–TSY–000170
(Digital Cross–Connect System Requirements and Ob- jectives, November 1985), and the CCITT Recommen-
dations G.735 and G.742. The DS2188 is compatible
with the DS2180A T1/ISDN Primary Rate Transceiver
and DS2181A CEPT Transceiver and it is the compan-
ion to the DS2187 T1/CEPT Receive Line Interface and
DS2186 T1/CEPT Transmit Line Interface. It can also
be used in conjunction with the DS2190 T1 Network In-
terface Unit.