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www.aeroflex.com
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S
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N
C
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C / I
Bit 4
Data
Sync
CT1508-2
MIL-STD-1397 Type E 10MHz
Serial Manchester 4-Bit SIS/SOS Decoder
Features
• Unique Manchester decoder requires no clock
• 4 Bit SIS/SOS output
• Operates with ±5 volt supply
• Removes sync, word identifier and parity bits
• Does both data and SIS/SOS decoding
• Detects parity on all received data
• Flags received messages with word lengths greater than 4 bits
• Accepts self-test inputs for BITE applications
• Generates one clock edge per received bit for bit counting applications
• May be used as a serial decoder for indefinite word lengths
• Interfaces directly to the CT1496-2 (Manchester Encoder) and CT1469-2 (Transceiver)
• MIL-PRF-38534 compliant devices available
CIRCUIT TECHNOLOGY
ISO
1
900
I
General Description
CT1508-2 is a hybrid microcircuit which incorporates a serial decoder in a single package. The encoder accepts a "N"
Bit (Typically 4, 34 or 35) serial Manchester encoded TTL NRZ signals and outputs a 4 bit SIS/SOS TTL output along
with "N" recovered data Bits/Clocks. Aeroflex Circuit Technology is a 80,000 square foot MIL-PRF-38534 certified
facility in Plainview, N.Y.
Master
DATAst
DATA
DATA
DATAst
+5V
Gnd
-5V
Data
Reconstruct
V
CC
VEE
Manchester
Decoder/Clock
Regenerator
Transmission
Envelope
Reset
4 Bit
SIS/SOS
Register
SIS/SOS Output
Counter
TP1
TP1
Test Points
TP1
DATAr
CLOCKr
SIS/SOS
False
TP1
Block Diagram
eroflex Circuit Technology – Data Bus Modules For The Future © SCDCT1508 REV A 3/22/00
Page 2
Aeroflex Circuit Technology SCDCT1508 REV A 3/22/00 Plainview NY (516) 694-6700
2
1ST Data
Bit
RX Data
2ND Data
Bit
3RD Data
PW1
Bit
4TH Data
Bit
5TH Data
Bit
V
VIL
IH
T2
T1
VIH
RX Data
PW2
VIL
T3
T5
Transmission
Envelope
VOH
VOL
T6
OH
Data
R
V
VOL
T7
VOH
Clock
SIS/SOS
False
R
T4
T9
T10
V
3V
0V
OL
PW3
Master Reset
T11
3V
0V
Figure 1 – Decoder Timing Waveforms
Page 3
Absolute Maximum Ratings
Parameter Rating Units
Supply Voltage
V
CC
VEE
+7.0
-7.0
V
V
Input Voltage +0.5 to +5.5 V
Applied Output Voltage -0.5 to +7.0 V
Power Dissipation 2.17 W
Storage Temperature Range -60 to +150 °C
Operating Case Temperature Range -55 to +100 °C
DC Electrical Characteristics
(VDD = 5V ±10%, TC = -55 °C to +100°C, unless otherwise specified)
SYMBOL PARAMETER LIMIT
SIS/SOS False & SIS/SOS Outputs
V
OH Logic High Output Voltage 2.4V min @ IOH = -50µA, VCC = +4.5V
V
OL Logic Low Output Voltage 0.4V max @ IOL = 2mA, VCC = +4.5V
Clock
& Data
r
r
VOH Logic High Output Voltage 2.4V min @ IOH = -150mA, VCC = +4.5
V
OL Logic Low Output Voltage 0.4V max @ IOL = 6mA, VCC = +4.5V
Transmission Envelope
V
OH Logic High Output Voltage 2.4V min @ IOH = -200mA, VCC = +4.5V
V
OL Logic Low Output Voltage 0.4V max @ IOL = 8mA, VCC = +4.5V
RX DATA, RX DATA
I
IH Logic High Input Current 50µA max @ VIH = 2.7V, VCC = +5.5V
I
IL Logic Low Input Current 2mA max @ VIL = 0.4V, VCC = +5.5V
, DATAst, DATAst & Master Reset
DC Supply Currents
I
CC VCC = +5.5V (pin 1) 360mA max
IEE
Aeroflex Circuit Technology SCDCT1508 REV A 3/22/00 Plainview NY (516) 694-6700
VEE = -5.5V (pin 9) 35mA max
3
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Decoder Timing Characteristics
(VCC = 5V ±10%, TC = -55 °C to +100°C, See Figure 1, unless otherwise specified)
Symbol Parameter / Condition Min Typ Max Unit
T1 Bit transition 0 - 0, 1 - 1 35 60 65 ns
T2 Bit transition 0 - 1, 1 - 0 90 100 130 ns
T3 Transmission envelope off delay 100 - 250 ns
T4 Clock
low time 35 50 65 ns
R
T5 Envelope delay time - 25 40 ns
T6 Data decode delay - 35 45 ns
T7 Clock low transition delay - 50 - ns
T8 Word Parity Delay - 120 - ns
T9 Clock
low time 35 50 65 ns
R
T10 SIS/SOS false delay time - 40 80 ns
T11 minimum reset disable time 20 - - ns
PW1 Half Bit input pulse 20 50 65 ns
PW2 Full Bit input pulse 90 100 130 ns
PW3 Master reset pulse width 60 - - ns
Aeroflex Circuit Technology SCDCT1508 REV A 3/22/00 Plainview NY (516) 694-6700
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Functional Description and Pinout
Pin
Pin Name Function Load or
#
1 V
9 V
2 RX
4 RX
3 DATA
6 DATA
14 Transmission
CC +5V ± 10% -
EE -5V ± 10% -
DATA Connect to DATA output of RX 1 S Load
DATA Connect to DATA output of RX 1 S Load
ST Connect to DATAST output of encoder 1 S Load
ST Connect to DATAST output of encoder 1 S Load
High within approximately 40nSec of reception
Envelope
of first half bit; goes low approximately 100nSec
after reception of last half bit (normally low in
inactive state).
19 SIS/SOS False Reset to low state on clear. Goes high
reception of transmission with word length
greater than 4 bits.
Drive
4 S Drives
1 S Drive
20
21
22
SIS/SOS Output
(Pin 24 - LSB)
(Pin 20 - MSB)
Last 4 bits received reside in this register until
cleared. If valid SIS/SOS then register contains
SIS/SOS message.
24
17 Data
R
Reconstructed Data. Data state to be
considered in conjunction with positive edges of
8 Clock
Clock
R
Reconstructed Clock (approximately 50% duty
.
R
cycle) to be used in conjunction with
Reconstructed Data and maybe used for bit
counting applications.
7 Master Reset Clears all data registers, bit counter, WORD
PARITY on low. Must be used after each word
to initialize bit counter and parity detector.
11 TP1 Do not connect.
15 TP2 Do not connect.
16 TP3 Do not connect.
1 S Drive
13 TP4 Do not connect.
Aeroflex Circuit Technology SCDCT1508 REV A 3/22/00 Plainview NY (516) 694-6700
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Functional Description and Pinout (con’t)
Pin
Pin Name Function Load or
#
General Notes:
1 S Load: Requires I
1 S Drive: Requires I
IL = 2 mA Max. IIH = 50 µA Max. CIN <15pF
OH = 50 µA Min. IOL = 2 mA Min.
Thruput Delay - 150 nSec Max to serial outputs
Power Dissipation
1.38 Watts Typ +5V ±10% 250 mA Typ, 360 mA Max.
2.17 Watts Max. -5V ±10% 25 mA Typ, 35 mA Max.
Power Sequence is not required.
Drive
Aeroflex Circuit Technology SCDCT1508 REV A 3/22/00 Plainview NY (516) 694-6700
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Pin #’s Functions Pin #’s Functions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Vcc (+5V)
DATA
DATA ST
DATA
GND
DATA
ST
MASTER RESET
CLOCK R
V
EE (-5V)
GND
TP1
GND
TP4
TRANSMISSION ENVELOPE
31
32
33
34
35
36
37
38
39
40
41
42
43
44
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
15
16
17
18
19
20
21
22
23
24
25
26
27
28
TP2
TP3
DATA R
GND
SIS/SOS FALSE
BIT 4
C/I
DATA (SIS/SOS)
GND
SYNC
NC
NC
NC
NC
45
46
47
48
49
50
51
52
53
54
55
56
57
58
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
29
30
Aeroflex Circuit Technology SCDCT1508 REV A 3/22/00 Plainview NY (516) 694-6700
NC
NC
59
60
7
NC
NC
Page 8
CIRCUIT TECHNOLOGY
Ordering Information
Model Number Package
CT1508-2 Flat Package
Flat Package Outline
1.590 MAX
Lead 1 & ESD
Designator
.015 ±.003 .050 TYP
Specifications subject to change without notice.
(30 Leads/Side on .050 centers)
1.450
1.015
MAX
.450
MIN
.175 MAX
.010 ±.002
Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11803
Aeroflex Circuit Technology SCDCT1508 REV A 3/22/00 Plainview NY (516) 694-6700
8
Toll Free Inquiries: 1-(800)THE-1553
Telephone: (516) 694-6700
FAX: (516) 694-6715
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