ELECTRONIC MULTIPLEX SWITCH

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP72B00464R000400010047-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 11
• Document Creation Date: December 27, 2016
• Document Release Date: January 9, 2012
• Sequence Number: 47
• Publication Date: October 18, 1965
• Content Type: FORM

1
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
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EMR I
CHANGE PROPOSAL
1940-2 STAT
DATE
AFFECTS s
18 October 1965
Vehicle Maintenance Recording System
NAME OF MAJOR CCMPONENP
PART OR LOWEST SUBASSEMBLY
PART NO. MODEL OR TYPE
Multiplex Switch
318483 Unit No. 73A
TITLE OF PROPOSAL:
Electronic Multiplex Switch
NATURE OF PROPOSAL:
The Contractor shall provide an Electronic Multiplex Switch
in accordance with the criteria set forth under the EMR
Contractor's Proposal J-4939-Rev. A dated 15 October 1965
attached hereto and made a part of this ECP.
The Contractor will on approximately 22 Nov. '65 submit for SPO
approval a test plan which outlines the use of the articles
after completion of fabrication, said test plan to constitute
the criteria for acceptance of the articles at the EMR
Contractor's facility.
REASON FOR PROPOSAL:
Provide a high performance completely solid state electronic
multiplexer switch which is to be mechanically and electrically
interchangeable with the present electromechanical unit
utilized in the Vehicle Maintefiance Recording System.
ESTIMATED COST AND TIME INVOLVED: -
ADDITIONAL FUNDING REQUIRED:
ES TID SfST-M T~ 3R PARTSt
CP
ADDITIONAL FUNDING REQUIRED:
ITEMS AFFECTED'BY PROPOSAL:
SAFETY
I
EFFECT.
PERT.
PROC ). LTT.
. 0 &
.BAL. 3UP.
INTO
PROCED
. LIFE
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MANUAL
MAINT.
MANUAL
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C1
' D ? TO !1'B~OMPLIGH CHANGE IN F=
SOURCE OF PARTS FOR KIT
AVAILABILITY WEEKS AFTE APPROVAL
Eng. model 1D'-D'-Proto. 28 Feb.' 66
1Ten (10) production units by 3/30/66
DISPOSITION OF SPARES AFFECTF.T.):
N/A
INITTATED BY: ,
APPROVED BY:
SPO & EMR Contractor
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
ELECTRONIC MULTIPLEX SWITCH
J-4939
29 JUNE 1965
REV. A - 15 OCTOBER 1965 STAT
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
~. t
EXHIBIT A
ELECTRONIC MULTIPLEX SWITCH
A completely solid state electronic multiplexer switch
is proposed which will be electrically and mechanically a direct
plug-in replacement for the present electromechanical unit.
.
The new unit offers all the advantages of solid state
circuitry including the following:
1. Much greater lifetime - no moving parts
2. High reliability
3. Reduced RFI generated
4. Substantial decrease in weight
5. Ease of maintenance
Ease of troubleshooting and repair
7. Rapid and reliable synchronizing from master drive
8. Constructed of the same standard solid state components
used in EMR-AGE, hence simplified sparing and logistics
9. Operates continuously in ambient temperatures up to
700C (158?F) with no cooling, and in much higher ambient
temperatures with proper cooling.
10. Basic MPX switch is a single deck, 45 contact unit.
Additional 45 contact decks may be added easily, operating
from the same drive circuitry. Up to 3 decks can be
accommodated in the same dimensions as the present
mechanical switch. By adding length, up to 5 decks can
be driven from the same drive circuits.
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
11. Voltage drop through the solid state switching elements
is negligible (in the microvolt region) and will not
degrade the overall system scaling accuracy.
12. Insensitive to transients and overvoltages.
The electronic MPX switch offers notable advantages in
rapid synchronization. If a noise pulse put the multiplexer out
of sync, the mechanical unit cculd generate as many as 48 scans
of erroneous data until synchronization was reachieved. The solid-
state electronic switch will be completely.resynchronized at the
end of each scan.
The block diagram of the electronic multiplexer is shown
in Figure 1. The sequence logic puts a gate pulse on one of its
output lines each time a clock pulse is received. The gate
progresses sequentially down the lines, returning to 1 after 47
or whenever a sync pulse is received.
The analog gates transmit their inputs only when they
receive a gate pulse. Thus the forty-seven inputs are sampled
sequentially to make up the multiplexer output.
In packaging this unit the sequence logic and power
regulators will be mounted on one set of printed circuit boards.
The analog gates will be mounted on other boards. A multi-output
multiplexer is easily achieved with this arrangement by wiring the
outputs of the sequence logic boards to another set of analog gate
boards. This would serve the same function as adding a new deck
to the electromechanical multiplexer.
-2-
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
A flip-flop ring counter will be used for the sequence
logic. Only one stage at a time is in the set state. Each
clock pulse would shift the set state one stage down the ring.
The ring closes on itself so that the number 1 stage follows the
number 47 stage. Whenever a sync pulse is received the ring is
reset so that only the number 1 stage is set (if it is not already
in this position). Three stages of logic are used to make the
ring stay in positions 45 and 47 for two counts each. All the
electronics for the sequence logic are integrated circuits to
keep weight and size to a minimum and to provide the highest
reliability.
. The analog gate will be a field effect transistor.
These units are packaged in a T05 transistor case. When the gates
are in the open state the leakage current is of the order of a few
nanoamperes. When they are closed, the off-set voltage is of the
order of a hundred microvolts. The dynamic impedance in the con-
ducting state is several hundred ohms which is negligible com-
pared to a 100K load.
The analog gates conduct continuously only when
ground potential is applied to the gating input. The outputs
of the sequence logic will be used to gate the analog gates.
The 47 AND gates needed would be integrated quadruple two in-
put logic gates.
3-
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
The above design for the multiplexer has the advantage
of not needing an output buffer stage. The low leakage current
of the analog gates allow them to be tied directly together.
Their low dynamic resistance and offset voltage eliminates the
need for an output amplifier.
An outline drawing. of the present mechanical multiplexer
is shown in Figure 2. This package is not the optimum one for a
solid state unit. It appears doubtful that much of a reduction
in volume can be achieved and still maintain the same physical
connector configuration. If the connectors could be moved slightly
the volume would probably be reduced substantially. On the as-
sumption that the connectors cannot be moved, Figure 3 shows a
possible packaging arrangement for a solid-state double deck
multiplexer in the same package as a mechanical single deck unit.
The solid state unit will be considerably lighter than
the old mechanical multiplexer, cutting the weight approximately
in half. The solid state multiplexer will also be extremely
reliable. The estimated mean time.between failure of the system
described above would be in excess of 4,000 hours at 70?C, in-
creasing substantially at lower operating temperatures. High
reliability parts are used throughout.
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
F OFQsED ELECTRONIC MULTIPLEX
SWITC1i BLOCK DIAGRAM
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Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
_6-
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
FIGUR( 3
_7_ .
> POSE D ELECTRONIC
MULTI PI.-EX ?. SWITCH
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
Go Ahead
.Development
Delivery '.of. Engineering 'Model.
(For Flight Test).
Delivery of Production. :Units
(End of Month Deliveries
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
 Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0
FILE' C1 -1940-2
DATE' 18 October 1965
ITEM NO: ECP 194.0-2 PR NO
CONTRACT: AF33 (657) -12846
DESCRIPTION OF ITEM: Electronic Multiplex Switch
COSTS
TOTAL LABOR
DIRECT LABOR CLASS
TOTAL HOURS
LABOR CLASS A
LABOR CLASS B
ADMINISTRATIVE
(DIRECT)
2020
4707
4.707
ENGINEERING
4390
24311
t
2 _. _ ...
TECHNICIANS
2250
8857
PUBLICATIONS
100
280
280
DESIGN AND DRAFTING
1660
5662
5662
SHOP
570
1829
1829 __.._
ELECTRICAL ASSEMBLY
2570
7656
7656
INSPECTION
550
166 3
1663
s %;&Amxmmmxxmm
920
3404
0 -
____ _
PACKAGING AND SHIPPING
20
56
56
81C$_ uINEERING
0
3330
(I) TOTAL DIRECT LABOR
43873
1 882
_
61755
OVERHEAD:10 % OF DIRECT LABOR CLASS (A)
74 % OF DIRECT LABOR CLASS (B) 13233
RAW MATERIAL AND PURCHASED PARTS 24295
SUBCONTRACTING
TRAVEL AND SUBSISTENCE 2737
OVERTIME PREMIUM 1918
PACKAGING AND SHIPPING - 140
OTHER DIRECT CHARGES
(5) GENERAL AND ADMINISTRATIVE EXPENSE, 7.5 % OF (4)
(7) PLANNED PROFIT OR FEE 8 % OF ESTIMATED COST, (6)
29090
$ 149706
$ 11228
$ 160934
$ 12875 -_--
$ 173809
Declassified in Part - Sanitized Copy Approved for Release 2012/01/09: CIA-RDP72B00464R000400010047-0