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PDF HC3-5560-5 Data sheet ( Hoja de datos )
| Número de pieza | HC3-5560-5 | |
| Descripción | PCM Transcoder | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
HC-5560
January 1997 File Number 2887.2
PCM Transcoder
The HC-5560 digital line transcoder provides encoding and
decoding of pseudo ternary line code substitution schemes.
Unlike other industry standard transcoders, the HC-5560
provides four worldwide compatible mode selectable code
substitution schemes, including HDB3 (High Density Bipolar
3), B6ZS, B8ZS (Bipolar with 6 or 8 Zero Substitution) and
AMI (Alternate Mark Inversion).
The HC-5560 is fabricated in CMOS and operates from a
single 5V supply. All inputs and outputs are TTL compatible.
Application Note #573, “The HC-5560 Digital Line
Transcoder,” by D.J. Donovan is available.
Ordering Information
PART TEMP. RANGE
NUMBER (oC) PACKAGE
PKG. NO.
HC3-5560-5
0 to 70 20 Ld PDIP E20.3
Pinout
HC-5560
(PDIP)
TOP VIEW
FORCE AIS 1
MODE SELECT 1 2
NRZ DATA IN 3
CLK ENC 4
MODE SELECT 2 5
NRZ DATA OUT 6
CLK DEC 7
RESET AIS 8
AIS 9
VSS 10
20 VDD
19 OUTPUT ENABLE
18 RESET
17 OUT1
16 OUT2
15 BIN
14 LOOP TEST ENABLE
13 AIN
12 CLOCK
11 ERROR
Features
• Single 5V Supply . . . . . . . . . . . . . . . . . . . . . . .10mA (Typ)
• Mode Selectable Coding Including:
- AMI (T1, T1C)
- B8ZS (T1)
- HDB3 (PCM30)
• North American and European Compatibility
• Simultaneous Encoding and Decoding
• Asynchronous Operation
• Loop Back Control
• Transmission Error Detection
• Alarm Indication Signal
• Replaces MJ1440, MJ1471 and TCM2201 Transcoders
Applications
• North American and European PCM Transmission Lines
where Pseudo Ternary Line Code Substitution Schemes
are Desired
• Any Equipment that Interfaces T1, T1C, T2 or PCM30
Lines Including Multiplexers, Channel Service Units,
(CSUs) Echo Cancellors, Digital Cross-Connects (DSXs),
T1 Compressors, etc.
• Related Literature
- AN573, The HC-5560 Digital Line Transcoder
Functional Diagram
MODE 1
SELECT 2
NRZ DATA IN
CLK ENC
OUTPUT
ENABLE
TRANSMITTER/
ENCODER
VDD
VSS
CLOCK
OUT 1
OUT 2
LOOP TEST
ENABLE
AIN
BIN
FORCE AIS
RESET
CLK DEC
RESET AIS
SWITCH
RECEIVER/
DECODER
NRZ DATA
OUT
AIS
DETECT
ERROR
DETECT
ERROR
AIS
69 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1 page  
HC-5560
with N Zero Substitution. B6ZS is used commonly in North
American T2 (6.3212MHz) carriers. For every string of 6
zeros, bipolar code is substituted according to the following
rule:
If the immediate preceding pulse is of (-) polarity, then
code each group of 6 zeros as 0+- 0+-, and if the
immediate preceding pulse is of (+) polarity, code each
group of 6 zeros as 0+- 0-+.
One can see the consecutive logic 1 pulses of the same
polarity violate the AMI coding scheme.
e.g.,
6
PCM CODE
0 0 0 1 0 1 110 0 0 0 0 0 1
0 - +0 + -
B6ZS (-)
V
V
0+-0 - +
B6ZS (+)
V = VIOLATION
V
V
B8ZS is used commonly in North American T1 (1.544MHz)
and T1C (3.152MHz) carriers. For every string of 8 zeros,
bipolar code is substituted according to the following rules:
1. If the immediate preceding pulse is of (-) polarity, then
code each group of 8 zeros as 000-+ 0+-.
2. If the immediate preceding pulse is of (+) polarity then
code each group of 8 zeros as 000+-0-+.
e.g.,
8
PCM CODE
1 0 10 0 0 0 0 0 0 0 1 1 0
B8ZS (-)
00 0 - +0+ -
V
V
B8ZS (+)
0 0 0 + -0 - +
V
V = VIOLATION
The BNZS coding schemes, in addition to eliminating DC
wander, minimize timing jitter and allow a line error monitor-
ing capability.
Another coding scheme is HDB3, high density bipolar 3, used
primarily in Europe for 2.048MHz and 8.448MHz carriers. This
code is similar to BNZS in that it substitutes bipolar code for 4
consecutive zeros according to the following rule:
1. If the polarity of the immediate preceding pulse is (-)
and there have been an odd (even) number of logic 1
pulses since the last substitution, each group of 4 con-
secutive zeros is coded as 000-(+00+).
2. If the polarity of the immediate preceding pulse is (+)
then the substitution is 000+(-00-) for odd (even) num-
ber of logic 1 pulses since the last substitution.
e.g.,
4
4
PCM CODE
0 0 0 0 1 01 11 0 0 0 0 0 0 1
HDB3 (-)
000 -
V
+ 0 0+
V
HDB3 (+)
000 +
V
- 0 0-
V
V = VIOLATION
The 3 in HDB3 refers to the coding format that precludes
strings of zeros greater than 3. Note that violations are pro-
duced only in the fourth bit location of the substitution code
and that successive substitutions produce alternate polarity
violations.
73
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