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HD1-6409-9 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer HD1-6409-9
Beschreibung CMOS Manchester Encoder-Decoder
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 12 Seiten
HD1-6409-9 Datasheet, Funktion
HD-6409
March 1997
CMOS Manchester Encoder-Decoder
Features
• Converter or Repeater Mode
• Independent Manchester Encoder and Decoder
Operation
• Static to One Megabit/sec Data Rate Guaranteed
• Low Bit Error Rate
• Digital PLL Clock Recovery
• On Chip Oscillator
• Low Operating Power: 50mW Typical at +5V
• Available in 20 Lead Dual-In-Line and 20 Pad LCC
Package
Ordering Information
PACKAGE
PDIP
SOIC
CERDIP
DESC
CLCC
DESC
TEMPERATURE
RANGE
-40oC to +85oC
-40oC to +85oC
-40oC to +85oC
-55oC to 125oC
-40oC to +85oC
-55oC to 125oC
1 MEGABIT/SEC
HD3-6409-9
HD9P6409-9
HD1-6409-9
5962-9088801MRA
HD4-6409-9
5962-9088801M2A
PKG.
NO.
E20.3
M20.3
F20.3
F20.3
J20.A
J20.A
Description
The HD-6409 Manchester Encoder-Decoder (MED) is a high
speed, low power device manufactured using self-aligned sil-
icon gate technology. The device is intended for use in serial
data communication, and can be operated in either of two
modes. In the converter mode, the MED converts Non
return-to-Zero code (NRZ) into Manchester code and
decodes Manchester code into Nonreturn-to-Zero code. For
serial data communication, Manchester code does not have
some of the deficiencies inherent in Nonreturn-to-Zero code.
For instance, use of the MED on a serial line eliminates DC
components, provides clock recovery, and gives a relatively
high degree of noise immunity. Because the MED converts
the most commonly used code (NRZ) to Manchester code,
the advantages of using Manchester code are easily realized
in a serial data link.
In the Repeater mode, the MED accepts Manchester code
input and reconstructs it with a recovered clock. This mini-
mizes the effects of noise on a serial data link. A digital
phase lock loop generates the recovered clock. A maximum
data rate of 1MHz requires only 50mW of power.
Manchester code is used in magnetic tape recording and in
fiber optic communication, and generally is used where data
accuracy is imperative. Because it frames blocks of data, the
HD-6409 easily interfaces to protocol controllers.
Pinouts
HD-6409 (CERDIP, PDIP, SOIC)
TOP VIEW
HD-6409 (CLCC)
TOP VIEW
BZI 1
BOI 2
UDI 3
SD/CDS 4
SDO 5
SRST 6
NVM 7
DCLK 8
RST 9
GND 10
20 VCC
19 BOO
18 BZO
17 SS
16 ECLK
15 CTS
14 MS
13 OX
12 IX
11 CO
3 2 1 20 19
SD/CDS 4
18 BZO
SDO 5
17 SS
SRST 6
16 ECLK
NVM 7
15 CTS
DCLK 8
14 MS
9 10 11 12 13
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
5-1
File Number 2951.1






HD1-6409-9 Datasheet, Funktion
HD-6409
Manchester Code
Nonreturn-to-Zero (NRZ) code represents the binary values
logic-O and Iogic-1 with a static level maintained throughout
the data cell. In contrast, Manchester code represents data
with a level transition in the middle of the data cell. Manches-
ter has bandwidth, error detection, and synchronization
advantages over NRZ code.
The Manchester II code Bipolar One and Bipolar Zero shown
below are logical complements. The direction of the transi-
tion indicates the binary value of data. A logic-0 in Bipolar
One is defined as a Low to high transition in the middle of
the data cell, and a logic-1 as a high to low mid bit transition,
Manchester Il is also known as Biphase-L code.
The bandwidth of NRZ is from DC to the clock frequency fc/2,
while that of Manchester is from fc/2 to fc. Thus, Manchester
can be AC or transformer coupled, which has considerable
advantages over DC coupling. Also, the ratio of maximum to
minimum frequency of Manchester extends one octave, while
the ratio for NRZ is the range of 5-10 octaves. It is much eas-
ier to design a narrow band than a wideband amp.
Secondly, the mid bit transition in each data cell provides the
code with an effective error detection scheme. If noise pro-
duces a logic inversion in the data cell such that there is no
transition, an error indiction is given, and synchronization
must be re-established. This places relatively stringent
requirements on the incoming data.
The synchronization advantages of using the HD-6409 and
Manchester code are several fold. One is that Manchester is
a self clocking code. The clock in serial data communication
defines the position of each data cell. Non self clocking
codes, as NRZ, often require an extra clock wire or clock
track (in magnetic recording). Further, there can be a phase
variation between the clock and data track. Crosstalk
between the two may be a problem. In Manchester, the
serial data stream contains both the clock and the data, with
the position of the mid bit transition representing the clock,
and the direction of the transition representing data. There is
no phase variation between the clock and the data.
A second synchronization advantage is a result of the num-
ber of transitions in the data. The decoder resynchronizes on
each transition, or at least once every data cell. In contrast,
receivers using NRZ, which does not necessarily have tran-
sitions, must resynchronize on frame bit transitions, which
occur far less often, usually on a character basis. This more
frequent resynchronization eliminates the cumulative effect
of errors over successive data cells. A final synchronization
advantage concerns the HD-6409’s sync pulse used to ini-
tiate synchronization. This three bit wide pattern is suffi-
ciently distinct from Manchester data that a false start by the
receiver is unlikely.
BIT PERIOD
BINARY CODE
NONRETURN
TO ZERO
1
0
23
11
45
00
BIPOLAR ONE
BIPOLAR ZERO
FIGURE 4. MANCHESTER CODE
Crystal Oscillator Mode
LC Oscillator Mode
C1
C0
C1
IX
C1 = 32pF
16MHz
C0 = CRYSTAL + STRAY
X1 = AT CUT PARALLEL
R1 X1
RESONANCE
FUNDAMENTAL
MODE
RS (TYP) = 30
OX R1 = 15M
CO
C1
IX
C1 = 20pF
C0 = 5pF
L CE C-----1-------2---2---C-----0--
OX
fO
-----------1------------
2π LCe
C1
FIGURE 5. CRYSTAL OSCILLATOR MODE
FIGURE 6. LC OSCILLATOR MODE
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6 Page









HD1-6409-9 pdf, datenblatt
Timing Waveforms (Continued)
HD-6409
UDI
ECLK
BZO
SDO
NVM
MANCHESTER ‘1’
MANCHESTER ‘0’
MANCHESTER ‘0’
MANCHESTER ‘1’
tR2
tR2
tR1
MANCHESTER ‘1’
tR3
MANCHESTER ‘0’
MANCHESTER ‘0’
tR3
FIGURE 17. REPEATER TIMING
Test Load Circuit
DUT
CL
(NOTE)
NOTE: INCLUDES STRAY AND JIG
CAPACITANCE
FIGURE 18. TEST LOAD CIRCUIT
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
Sales Office Headquarters
NORTH AMERICA
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (407) 724-7000
FAX: (407) 724-7240
EUROPE
Intersil SA
Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
ASIA
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Taiwan Limited
7F-6, No. 101 Fu Hsing North Road
Taipei, Taiwan
Republic of China
TEL: (886) 2 2716 9310
FAX: (886) 2 2715 3029
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