
5-1
March 1997
HD-6408
CMOS Asynchronous Serial
Manchester Adapter (ASMA)
Features
Low Bit Error Rate
Data Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1MBit/s
Sync Identification and Lock-In
Clock Recovery
Manchester II Encoder, Decoder
Separate Encode and Decode
Low Operating Power . . . . . . . . . . . . . . . . .50mW at 5V
Single Power Supply
24 Lead Package
Description
The HD-6408 is a CMOS/LSI Manchester Encoder/Decoder
for creating a very high speed asynchronous serial data bus.
The Encoder converts serial NRZ data (typically from a shift
register) to Manchester II encoded data, adding a sync pulse
and parity bit. The Decoder recognizes this sync pulse and
identifies it as a Command Sync or a Data Sync. The data is
then decoded and shifted out in NRZ code (typically into a
shift register). Finally, the parity bit is checked. If there were
no Manchester or parity errors the Decoder responds with a
valid word signal. The Decoder puts the Manchester code to
full use to provide clock recovery and excellent noise immu-
nity at these very high speeds.
The HD-6408 can be used in many commercial applications
such as security systems, environmental control systems,
serial data links and many others. It utilizes a single 12 x
clock and achieves data rates of up to one million bits per
second with a very minimum overhead of only 4 bits out of
20, leaving 16 bits for data.
Pinout
HD-6408 (DIP)
TOP VIEW
d
Ordering Information
PACKAGE
TEMP. RANGE
-40
o
C to +85
o
C
-40
o
C to +85
o
C
PART
NUMBER
PKG.
NO.
PDIP
HD3-6408-9
E24.6
CERDIP
HD1-6408-9
E24.6
1
2
3
4
5
6
7
8
9
10
11
12
VW
ESC
TD
SDO
DC
BZI
BOI
UDI
DSC
CDS
DR
GND
16
17
18
19
20
21
22
23
24
15
14
13
V
CC
EC
SCI
SD
SS
EE
BOO
BZO
DBS
MR
SDI
OI
File Number
2952.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright
Intersil Corporation 1999