FAST TTL Manchester Decoder Module
The FAST TTL Manchester Decoder Modules manufactured by Engineered Components Company are designed to
accept a TTL Manchester encoded data stream at a given bit rate and output the recovered clock signal and the
original data signal. Manchester data with a rising edge in the center of the bit period will interpreted as a “1” and
will result in a “high” output. Manchester data with a falling edge in the center of the bit period will be
interpreted as a “low” at the output. Minor edge skewing in the transmission cycle will be tolerated without
producing output errors. Skewing should not exceed that which would change a 50% duty cycle square wave at
the module’s bit rate by more than 6%.
The MTBF on these modules, when calculated per MIL-HDBK-217, for a 50 deg.C ground fixed environment
and with 50VDC applied, is in excess of 1.5 million hours. These modules will decode input frequency errors of
+/- 5% with no significant effect on the output error rate.
The module is provided in a 14-pin DIP package, fully encapsulated in epoxy resin and is housed in a Diallyl
Phthalate case, blue in color. The case marking is applied by silkscreen using white epoxy paint. The 5 copper
leads are tin-lead plated and meet the solderability requirements of MIL-STD-202, Method 208.
MECHANICAL DIAGRAM
Operating Specifications:
All measurements made at 25 deg. C
All measurements made with Vcc = +5VDC
All measurements made with (1) FAST TTL output load
Input is a Manchester data stream at the module’s
nominal bit rate (Output Frequency)
Operating Temperature: 0 to +70 deg. C
Storage Temperature: -55 to +125 deg. C
Vcc Supply Voltage: 4.75 to 5.25VDC
Vcc Supply Current: 80mA typical
Logic “High” Input:
Voltage: 2.0VDC min. ; Vcc max.
Current: 2.7VDC = 40uA max. ; 5.5VDC = 2mA max.
Logic “Low” Input:
Voltage: 0.8 VDC max.
Current: -1.2mA max.
Logic “High” Voltage Out: 2.7VDC min.
Logic “Low” Voltage Out: 0.5VDC max.
.060 TYP.
.300
TYP.
.150 TYP.
.300
.020 DIA. TYP.
V
.400
C
IN
FMDM-TTL-10
C
OUT
C
BLOCK DIAGRAM
V
C
IN
14
1
4
Product Selection Table
Part
Output
Number
Frequency (Mhz)
FMDM-TTL-2
2.0
FMDM-TTL-2.5
2.5
FMDM-TTL-3
3.0
FMDM-TTL-3.5
3.5
FMDM-TTL-4
4.0
FMDM-TTL-4.5
4.5
FMDM-TTL-5
5.0
Part
Output
Number
Frequency in MHz)
FMDM-TTL-5.5
5.5
FMDM-TTL-6
6.0
FMDM-TTL-7
7.0
FMDM-TTL-8
8.0
FMDM-TTL-9
9.0
FMDM-TTL-10
10.0
FMDM-TTL-11
11.0
Part
Output
Number
Frequency (Mhz)
FMDM-TTL-12
12.0
FMDM-TTL-13
13.0
FMDM-TTL-14
14.0
FMDM-TTL-15
15.0
FMDM-TTL-16
16.0
FMDM-TTL-17
17.0
FMDM-TTL-18
18.0
Special modules can often be manufactured to provide for customer specific applications.
engineered components company
A Division of Cornucopia Tool & Plastics, Inc. PO Box 1915, 448 Sherwood Rd., Paso Robles CA 93447
YYWW
D
OUT
.300
MADE IN USA
.030
DATE CODE
+/-.020
.140
Top view
.800
C
OUT
D
OUT
Decoder
7
8
C
Part
Output
Number
Frequency (MHz)
FMDM-TTL-19
19.0
FMDM-TTL-20
20.0
FMDM-TTL-21
21.0
FMDM-TTL-22
22.0
FMDM-TTL-23
23.0
FMDM-TTL-24
24.0
FMDM-TTL-25
25.0
Phone: 805-369-0034
Fax:
805-369-0033
Web: www.ec2.com
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