HD-6409
CMOS Manchester Encoder-Decoder
March 1997
Features
Description
• Converter or Repeater Mode
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.
• 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
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.
TEMPERATURE
RANGE
PKG.
PACKAGE
PDIP
1 MEGABIT/SEC
NO.
E20.3
M20.3
F20.3
o
o
-40 C to +85 C HD3-6409-9
o
o
SOIC
-40 C to +85 C HD9P6409-9
o
o
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.
CERDIP
DESC
CLCC
DESC
-40 C to +85 C HD1-6409-9
o
o
-55 C to 125 C 5962-9088801MRA F20.3
o
o
-40 C to +85 C HD4-6409-9
J20.A
o
o
-55 C to 125 C 5962-9088801M2A J20.A
Pinouts
HD-6409 (CERDIP, PDIP, SOIC)
HD-6409 (CLCC)
TOP VIEW
TOP VIEW
1
2
3
4
5
6
7
8
9
V
BZI
BOI
20
19
CC
BOO
3
2
1
20 19
UDI
18 BZO
17 SS
BZO
SS
18
17
SD/CDS
SDO
4
5
6
7
8
SD/CDS
SDO
16 ECLK
15 CTS
14 MS
SRST
NVM
16 ECLK
15 CTS
SRST
NVM
DCLK
RST
13 OX
MS
14
DCLK
12
IX
GND 10
11 CO
9
10 11 12 13
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
File Number 2951.1
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