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HD6409 の電気的特性と機能

HD6409のメーカーはIntersil Corporationです、この部品の機能は「CMOS Manchester Encoder-Decoder」です。


製品の詳細 ( Datasheet PDF )

部品番号 HD6409
部品説明 CMOS Manchester Encoder-Decoder
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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HD6409 Datasheet, HD6409 PDF,ピン配置, 機能
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
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File Number 2951.1

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HD6409 pdf, ピン配列
HD-6409
Pin Description
PIN
NUMBER TYPE SYMBOL
NAME
DESCRIPTION
1 I BZl Bipolar Zero Input Used in conjunction with pin 2, Bipolar One Input (BOl), to input Manchester II
encoded data to the decoder, BZI and BOl are logical complements. When using
pin 3, Unipolar Data Input (UDI) for data input, BZI must be held high.
2
I
BOl Bipolar One Input
Used in conjunction with pin 1, Bipolar Zero Input (BZI), to input Manchester II
encoded data to the decoder, BOI and BZI are logical complements. When using
pin 3, Unipolar Data Input (UDI) for data input, BOl must be held low.
3 I UDI Unipolar Data Input An alternate to bipolar input (BZl, BOl), Unipolar Data Input (UDl) is used to input
Manchester II encoded data to the decoder. When using pin 1 (BZl) and pin 2
(BOl) for data input, UDI must be held low.
4
I/O SD/CDS Serial Data/Com-
In the converter mode, SD/CDS is an input used to receive serial NRZ data. NRZ
mand Data Sync
data is accepted synchronously on the falling edge of encoder clock output
(ECLK). In the repeater mode, SD/CDS is an output indicating the status of last
valid sync pattern received. A high indicates a command sync and a low indicates
a data sync pattern.
5
O SDO Serial Data Out
The decoded serial NRZ data is transmitted out synchronously with the decoder
clock (DCLK). SDO is forced low when RST is low.
6 O SRST Serial Reset
In the converter mode, SRST follows RST. In the repeater mode, when RST goes
low, SRST goes low and remains low after RST goes high. SRST goes high only
when RST is high, the reset bit is zero, and a valid synchronization sequence is
received.
7 O NVM Nonvalid Manchester A low on NVM indicates that the decoder has received invalid Manchester data
and present data on Serial Data Out (SDO) is invalid. A high indicates that the
sync pulse and data were valid and SDO is valid. NVM is set low by a low on RST,
and remains low after RST goes high until valid sync pulse followed by two valid
Manchester bits is received.
8 O DCLK Decoder Clock The decoder clock is a 1X clock recovered from BZl and BOl, or UDI to synchro-
nously output received NRZ data (SDO).
9 I RST Reset
In the converter mode, a low on RST forces SDO, DCLK, NVM, and SRST low.
A high on RST enables SDO and DCLK, and forces SRST high. NVM remains
low after RST goes high until a valid sync pulse followed by two Manchester bits
is received, after which it goes high. In the repeater mode, RST has the same ef-
fect on SDO, DCLK and NVM as in the converter mode. When RST goes low,
SRST goes low and remains low after RST goes high. SRST goes high only
when RST is high, the reset bit is zero and a valid synchronization sequence is
received.
10 I GND Ground
Ground
11 O CO Clock Output
12 I IX Clock Input
Buffered output of clock input IX. May be used as clock signal for other peripherals.
IX is the input for an external clock or, if the internal oscillator is used, IX and OX
are used for the connection of the crystal.
13 O OX Clock Drive
If the internal oscillator is used, OX and IX are used for the connection of the crys-
tal.
14 I MS Mode Select
MS must be held low for operation in the converter mode, and high for operation
in the repeater mode.
15 I CTS Clear to Send
In the converter mode, a high disables the encoder, forcing outputs BOO, BZO high
and ECLK low. A high to low transition of CTS initiates transmission of a Command
sync pulse. A low on CTS enables BOO, BZO, and ECLK. In the repeater mode,
the function of CTS is identical to that of the converter mode with the exception that
a transition of CTS does not initiate a synchronization sequence.
16 O ECLK Encoder Clock
In the converter mode, ECLK is a 1X clock output used to receive serial NRZ data
to SD/CDS. In the repeater mode, ECLK is a 2X clock which is recovered from
BZl and BOl data by the digital phase locked loop.
5-3


3Pages


HD6409 電子部品, 半導体
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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共有リンク

Link :


部品番号部品説明メーカ
HD6402

CMOS Universal Asynchronous Receiver Transmitter (UART)

Harris Corporation
Harris Corporation
HD6409

CMOS Manchester Encoder-Decoder

Intersil Corporation
Intersil Corporation


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