Page 1
eroflex Circuit Technology – Data Bus Modules For The Future © SCDCT1775 REV A 8/17/99
CT1775
F
E
I
D
C
E
R
T
A
E
R
O
F
L
E
X
L
A
B
S
I
N
C
.
www.aeroflex.com
Universal MacAir/1553 Dumb RTU Hybrid
Features
• CT1775 Replaces DDC BUS-65201
• Includes:
•
Universal Transceiver
•
Encoder/decoder
•
Dual Rank I/O Registers
•
Fail-safe Timer
•
Clock Oscillator
• Small 1.6 " x 1.9 " Hybrid
• Simple Controls for Single or Dual Redundant Data Bus Configurations
• Provides Flags for:
•
Own Address (With Parity)
•
Mode Code
•
Broadcast
•
Time Out
•
Valid Word
•
Sync Type
• 16 Bit or 8 Bit 3-state
•
Parallel I/O and Serial Out
• Wraparound Built-In Test
• MIL-PRF-38534 compliant circuits available
• Packaging – Hermetic Metal
•
68 Pin, 1.85" x 1.6" x .19" Plug-In type package
CIRCUIT TECHNOLOGY
ISO
9001
I
General Description
The CT1775 Universal MACAIR/1553 Dumb Remote Terminal Unit (RTU) consists of a
transceiver, and encoder/decoder, control logic, dual rank I/O registers and internal clock oscillator
packaged in a 1.6" x 1.9" hermetic hybrid. It provides all the functions required to interface between
a MACAIR (sinusodial) or MIL-STD-1553 (Trapezoidal) serial MUX data bus and a subsystem
parallel 3-state data highway. Utilizing several ASIC ICs, the CT1775 provides sufficient
handshaking, control and data lines to permit versatile operation as a remote terminal, a bus
controller or a bus monitor, in either single or dual redundant data bus configurations.
As a transmitter, the CT1775 accepts 8 bit or 16 bit parallel date from the subsystem, and outputs
serial Manchester II coded Command, Status or Data words, under subsystem control. As a
receiver, it accepts serial MIL-STD-1553 or MACAIR transmissions and transfers all Command,
Status and Data words to the 8 bit or 16 bit data highway, under subsystem control. The CT1775
also provides flags to the subsystem when Broadcast, Mode Code, and Own Address (with parity)
commands are decoded.
The CT1775 contains a terminal fail-safe timeout circuit which flags message lengths exceeding
768µs, and terminates serial data transmission. Wraparound selftest is initiated by a control line
which causes the encoder serial output to be connected to the decoder input. The CT1775 provides
a serial output of decoded words, thus allowing Command Word look ahead, for the fastest terminal
response.
Page 2
Aeroflex Circuit Technology SCDCT1775 REV A 8/17/99 Plainview NY (516) 694-6700
2
T/O
DRIVER
FILTER
SHAPING
NETWORK
SHAPING
NETWORK
DRIVER
TX
TX DATA
TX DATA
FAIL-
SAFE
DRIVER
INHIBIT
SYNC
SELECT
ENC
ENABLE
CLOCK
GEN
CLOCK
IN
CLOCK
POWER
XTAL
CLOCK
OUT
RX
STROBE
DEC
RST
MRST
S/T
SELECT
ADDR
IN
DSC
OUT
ENA
ADDR
PAR
ADDR
PAR
IN
5
TAKE
DATA
DATA
SELECT1
DATA
SELECT2
ESC
OUT
SEND
DATA
LATCH
DATA1
LOAD
DATA1
LOAD
DATA2
LATCH
DATA2
SERIAL DATA IN
D15 (MSB)
CHAN SELECT
THRU
D0 (LSB)
BDST INHIBIT
BROADCAST
MODE CODE
VALID WORD
VAL CMD WD
FAIL-SAFE
COMM DATA SYNC
RTENABLE
DATA
PARITY
BIT STATUS
SERIAL DATA OUT
SERIAL DATA OUT
REGISTER
REGISTER
REGISTER
REGISTER
RX DATA
RX DATA
LIMITER
}
}
MANCHESTER
DECODER
AND
CONTROL LOGIC
MANCHESTER
ENCODER
AND
CONTROL LOGIC
Figure 1 – CT1775 Block Diagram
Page 3
Aeroflex Circuit Technology SCDCT1775 REV A 8/17/99 Plainview NY (516) 694-6700
3
Values at nominal Power Supply Voltages unless otherwise specified
PARAMETER VALUE UNITS
Receiver
Differential Input Impedance
(DC to 1MHz) 4 min K
Differential Input Voltage 40 max
Input Threshold (Direct Coupled) 1 typ
Ω
V
P-P
V
P-P
CMRR (DC to 2MHZ) 40 min dB
CMV (DC to 2MHZ) ±10 min V
RX STROBE
Characteristics 1 typ TTL Loads
Transmitter
Differential Output Voltage
Direct Coupled (across 145
Ω Load) 30 typ
Transformer Coupled (at stub) 21 typ
V
P-P
V
P-P
Output Rise and Fall time 130 typ ns
Output Noise 10 max
mV
P-P
TX INHIBIT Characteristics 1 typ TTL Loads
Logic
I
IH, IIL, IOH, IOL
V
OH
V
OL
V
IH
V
IL
See pin function &
loading Table.
2.5 min V
0.4 max V
2.0 min V
0.7 max V
Clock
(Internal Clock)
V
OHC
(Internal Clock)
V
OLC
(External Clock)
V
IHC
(External Clock)
V
ILC
Supply
-0.3 min
Ground
+0.3 min
Supply
-0.5 min
Ground
+0.5 min
V
V
V
V
Power Supplies
+5V OSC/CLOCK Supply
Voltage Tolerances ±10 %
Current Drain 8 typ; 13 max mA
+5V Logic Supply
Voltage Tolerances ±10 %
Current Drain 250 max mA
+15V (or +12V) Supply
Voltage Tolerances ±5 %
Current Drain 65 max mA
-15V Supply
Voltage Tolerances ±5 %
Current Drain
Idle 65 max mA
25% Transmit 105 max mA
100% Transmit 250 max mA
-12V Supply
Voltage Tolerances ±5 %
Current Drain
Idle 65 max mA
25% Transmit 105 max mA
100% Transmit 250 max mA
Temperature Range
Operating (Case)
Storage
−55 to +125 °C
−65 to +150 °C
Physical Characteristics
Size
68 pin DDIP 1.6 x 1.9 x 0.18 in
Table 1 – CT1775 Specifications
Page 4
Aeroflex Circuit Technology SCDCT1775 REV A 8/17/99 Plainview NY (516) 694-6700
4
DIRECT COUPLED
3
2
1
4
5
6
7
8
4
5
6
7
8
3
2
1
4
5
6
7
8
3
2
1
F
i
g
u
r
e
2
–
T
y
p
i
c
a
l
T
r
a
n
s
f
o
r
m
e
r
C
o
n
n
e
c
t
i
o
n
s
CT1775orCT17xx
TX DATA OUT
RX DATA IN
TX DATA OUT
RX DATA IN
51
68
49
55
55
.75Z
.75Z
Z
= 70
Ω
Z
= 70
1:1.41*
7V P-P30V P-P
21V P-P
TRANSFORMER COUPLED
1.2:1** (CT1775)
1.41:1* (CT177x)
1.67:1** (CT1775)
2:1* (CT177x)
Technitrol Part #’s
* = xxx
** = XXX
DATA BUS
67
Ω
Ο
Ο
Ο
Ο
Ο
Ο
Ω
Ω
Ο
Ο
Ω
Ω
Ω
Ω
Page 5
Aeroflex Circuit Technology SCDCT1775 REV A 8/17/99 Plainview NY (516) 694-6700
5
CT1775 Pin Out Description
1
GND
35
TMADDP
2
+5VOSC/CLOCKPOWER
36
CHANSELECT
3
N/C
37
ODDPARITY
4
TXINHIBIT
38
D15
5
SYNCSELECT
39
D13
6
SERIALDATAOUT
40
D11
7
ESCOUT
41
D9
8
N/C
42
D7
9
COMM/DATASYNC
43
D5
10
MRST
44
D3
11
VALIDWORD
45
D1
12
BITSTATUS
46
LOADDATA2
13
LATCHDATA1
47
+5V
14
VALCMDWD
48
+Vcc
15
BDCSTINH
49
RXDATAIN
16
TMADD1
50
RXSTROBE
17
TMADD3
51
TXDATAOUT
DATASELECT2
DATASELECT1
ENAPARCHECK
CT1775
MIL-STD-1553B
DUMB RTU HYBRID
LATCHDATA2
ENCENABLE
BROADCAST
XTAL
CASE
CLOCKOUT
TAKEDATA
DECRST
DSCOUT
D14
SENDDATA
D12
CLOCKIN
D10
S/TSELECT
D8
FAIL-SAFE
D6
RTENABLE
D4
MODECODE
D2
D0
LOADDATA1
GND
TMADD0
-Vcc
TMADD2
RXDATAIN
TMADD4
TXDATAOUT
18
52
19
53
20
54
21
55
22
56
23
57
24
58
25
59
26
60
27
61
28
62
29
63
30
64
31
65
32
66
33
67
34
68
Pin
#
1 GND 35 TMADDP
2 +5VOSC/
3 N/C 37 ODDPARITY
4 TXINHIBIT 38 D15
5 SYNCSELECT 39 D13
6 SERIALDATAOUT 40 D11
7 ESCOUT 41 D9
8 N/C 42 D7
9 COMM/DATASYNC 43 D5
10 MRST 44 D3
11 VALIDWORD 45 D1
12 BITSTATUS 46 LOADDATA2
13 LATCHDATA1 47 +5V
14 VALCMDWD 48 +Vcc
15 BDCSTINH 49 RXDATAIN
16 TMADD1 50 RXSTROBE
17 TMADD3 51 TXDATAOUT
18 XTAL 52 CASE
19 CLOCKOUT 53 DATASELECT2
20 TAKEDATA 54 DATASELECT1
21 DECRST 55 ENAPARCHECK
22 DSCOUT 56 D14
23 SENDDATA 57 D12
24 CLOCKIN 58 D10
25 S/TSELECT 59 D8
26 FAIL-SAFE 60 D6
27 RTENABLE 61 D4
28 MODECODE 62 D2
29 LATCHDATA2 63 D0
30 ENCENABLE 64 LOADDATA1
31 BROADCAST 65 GND
32 TMADD0 66 -Vcc
33 TMADD2 67 RXDATAIN
34 TMADD4 68 TXDATAOUT
Function
CLOCKPWR
Pin
#
36 CHANSELECT
Function
Figure 3 – Pin Connection Diagram, CT1775 and Pinout Table
Page 6
Aeroflex Circuit Technology SCDCT1775 REV A 8/17/99 Plainview NY (516) 694-6700
6
CIRCUIT TECHNOLOGY
Plainview New York 11803
Toll Free Inquiries: 1-(800)THE-1553
Ordering Information
1.600
Model Number Screening Power Supply Package
CT1775 Military Temperature, -55°C to +125°C,
Screened to the individual test methods
of MIL-STD-883
Plug In Package Outline
1.850
Lead 1 & ESD
Designator
.100
.095
Pin 1
Pin 2
.050
TYP
Pin 16
+5V, ±12V to ±15V Plug in
1.590
.190
Pin 17
Pin 51
MAX
Pin 35
1.400
1.200
Pin 18
Pin 52
Pin 19
.100
TYP
Pin 33
1.600
Aeroflex Circuit Technology
35 South Service Road
Specifications subject to change without notice.
.018 DIA
TYP
Pin 68
Pin 34
.180 MIN
Telephone: (516) 694-6700
FAX: (516) 694-6715
Loading...