
5-1
March 1997
HD-6409
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
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
PACKAGE
TEMPERATURE
RANGE
-40
o
C to +85
o
C
-40
o
C to +85
o
C
-40
o
C to +85
o
C
-55
o
C to 125
o
C
-40
o
C to +85
o
C
-55
o
C to 125
o
C
1 MEGABIT/SEC
PKG.
NO.
PDIP
HD3-6409-9
E20.3
SOIC
HD9P6409-9
M20.3
CERDIP
HD1-6409-9
F20.3
DESC
5962-9088801MRA
F20.3
CLCC
HD4-6409-9
J20.A
DESC
5962-9088801M2A
J20.A
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
BZI
BOI
UDI
SD/CDS
SDO
SRST
DCLK
NVM
RST
GND
V
CC
BOO
BZO
SS
ECLK
CTS
MS
OX
IX
CO
SD/CDS
SDO
SRST
NVM
DCLK
U
B
B
V
C
B
R
G
C
I
O
BZO
SS
ECLK
CTS
MS
4
5
6
7
8
10
11
12
13
9
3
2
1
20
19
16
17
18
15
14
File Number
2951.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
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Copyright
Intersil Corporation 1999