CT1815 [AEROFLEX]
CT1815 10MHz Low Level Serial Interface for MIL-STD-1397 Type D; 为MIL -STD - 1397 D型CT1815 10MHz的低电平的串行接口
| 型号： | CT1815 |
| 厂家： | 
AEROFLEX CIRCUIT TECHNOLOGY |
| 描述： | CT1815 10MHz Low Level Serial Interface for MIL-STD-1397 Type D |
| 文件： | 总7页 (文件大小：85K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CT1815
10MHz Low Level Serial Interface
for MIL-STD-1397 Type D
Features
• Internally set threshold
CIRCUIT TECHNOLOGY
www.aeroflex.com
• Matched to 50 ohm system impedance power on and off
• Operates with ±5 volt supplies
• Power management
• Accepts synchronous input data
• Unique Manchester decoder requires no clock
• Generates one clock per received bit
• May be used for serial decoding of indefinite word lengths
• Other Wire and Fiber Optic types available
ISO
9001
I
General Description
The CT1815 is a single hybrid micro-circuit which incorporates a serial encoder, transceiver, and Manchester decoder
in one package. The encoder accepts serial NRZ data in conjunction with two synchronous clocks. This data stream is
then Manchester encoded and maybe transformer coupled thru an external transformer to a 75 ohm tri-axial cable for
transmission through up to 1000 feet of cable. The CT1815 receiver section accepts bipolar Manchester encoded
signals and passes level detected signals to the serial decoder. The serial decoder reconstructs an NRZ data stream
with derived clock. This allows the data to be processed by our CT2500 monolithic protocol chip for MIL-STD-1397 serial
interfaces. All the input and output signals of the CT1815 are completely compatible with the CT2500. The CT1815 has
a power management function. A transmitter standby mode is available to reduce the overall power consumption of the
CT1815. Aeroflex Circuit Technology is an 80,000ft2 MIL-PRF-38534 certified facility in Plainview, N.Y.
XFMR SEC/DATA Input
Serial NRZ Data
10 MHz Shift Clock
20 MHz Gated Clock
XFMR SEC
Primary
Data
1CT:1
Output
Serial
Manchester
Encoder
+5V
Envelope
78Ω
Master Reset
Encoder Enable
Primary
Data
Output
Power
Management
XFMR SEC
ACT15-1031
External to
Hybrid
Power Management
XFMR SEC/DATA Input
Rx Strobe
Decoded Data Envelope
Manchester
Data
Reconstruction
Decoder
and
Clock Regeneration
ClockR
Decoded DataR
Figure 1 – Block Diagram
eroflex Circuit Technology – Data Bus Modules For The Future © SCDCT1815 REV A 6/12/98
synchronously with a recovered clock. The receiver
is designed to meet the MIL-STD-1397 Type D
requirements.
Transmission
The CT1815 accepts synchronous NRZ Data in
conjunction with two clocks signals. The NRZ data
stream is then converted to Manchester code which
is transformer coupled to a 75 ohm Tri-axial cable for
transmission up to 1000 ft.
Electrical Requirements
The specification detailed herein encompasses a
hybrid Transceiver/Encoder-Decoder designed to
meet the requirements of the MIL-STD-1397 Type D.
The transmitter may be placed into standby
condition. This reduces power consumption by
approximately 600mW. Power management is made
available via two standard TTL input pins. The
Receiver is always active and is not affected by the
power management circuitry.
The transceiver is transformer coupled to the
specified triaxial cable and is screened to the
individual test methods of MIL-STD-883
See Figure 1 for Block Diagram. Inputs and
Outputs are all Synchronous NRZ DATA STREAMS
The transceiver is matched for 75 ohm operation
over a wide band of frequencies. This condition is
maintained with power on and off.
Transformer Isolation
The CT1815 is connected with pin 3 and pin 32 to
the ACT15-1031 transformer secondary winding.
The center tap of the secondary winding is
connected to +5 volts. For matching 75Ω load
operation, a 78Ω resistor must be placed across the
primary winding of the transformer.
Reception
The CT1815 receiver section accepts a bipolar
signal which is level detected and passed to the
serial decoder. The decoder section reconstructs
the data and strips the clock from the serial stream.
An NRZ decoded data stream is then produced
Encoder Timing / Transmitter Specification
Symbol
Parameter / Condition
Encode Timing
Min
Typ
Max
Unit
t1
Input data set-up time
10
10
10
10
150
50
20
45
40
40
40
35
ns
ns
ns
ns
ns
ns
ns
ns
t2
Encode clock set-up time
Encode envelope set-up time
Encode envelope turn-off time
Transmitter activation set-up time
Transmitter deactivation hold-time
20 MHz gated CK pulse width high
Encoder shift CK pulse width high
Output Signals
t3
t4
t5
t6
tw1
tw2
30
55
Va
T
Output amplitude (see Figure 2)
Pulse period
2.75 3.25 3.75
V
ns
97
45
47
47
100
103
65
Ts
Te
Width of 1st positive half bit
Width of last half bit
ns
65
ns
T/2
Tr
Half pulse period
50
53
ns
Pulse rise time
2.0
2.0
350
150
V/ns
V/ns
mV
mV
Tf
Pulse fall time
Vs
Tos
Tdtx
Voltage overshoot
Offset Voltage 2T after last zero crossing
Delay from 20 MHz clock input to data output on
transformer secondary
20
75
55
80
ns
Zo
Output Impedance
70
Ω
2
Aeroflex Circuit Technology
SCDCT1815 REV A 6/12/98 Plainview NY (516) 694-6700
P1 = 50ns ±0.1%
P2 = 100ns ±0.1%
BIT 0
t1
BIT 1
BIT 2
BIT N
NRZ
Serial Input
tW2
t2
Encoder
Shift Clock Input
P2
tW1
20 MHz
GATED Clock
P1
t3
t4
NRZ
Envelope
t5
t6
Encoder Enable
Power Management
Pin
Tf
2T
90%
T
90%
Va
Transmitter
Output
VS
VUS
TdTX
10%
10%
TOS
Tr
Te
T/2
T
Figure 2 Encoder – Transmitter Timing
1st Data
BIT
2nd Data
BIT
3rd Data
BIT
4th Data
BIT
5th Data
BIT
Manchester II
Receiver Data
t6
t1
Decoded
Data
Envelope
t5
RXData
DataR
t7
t2
t4
t3
CKR
t5
Figure 3 Receiver / Decode Timing
Symbol Parameter / Condition
Min
Nom
Max
Units
t1
t2
t3
t4
t5
t6
t7
t8
Envelope delay time
Data decode delay
-
-
45
115
130
50
50
-
100
125
-
nsec
nsec
nsec
nsec
nsec
nsec
nsec
?
Clock low transition delay
Clock high time
-
35
35
120
5
65
65
270
-
R
Clock low time
R
Envelope off delay
Receiver strobe enable to input data set-up time
Receiver strobe disable to input data hold-time
-
20
-
-
Power Management Functional Table
Encoder
Enable
Power Management
Input
Receiver
Status
Transmitter
Status
(Pin 10)
(Pin 9)
0
X
1
0
1
X
Active
Active
Active
Standby
Active
Active
Power management timing see Figure 2.
4
Aeroflex Circuit Technology
SCDCT1815 REV A 6/12/98 Plainview NY (516) 694-6700
Functional Description and Pinout
Pin
#
Load or
Drive
Pin Name
Function
1
2
3
No connection
No connection
XFMR secondary/
RX data input
Transmitter-receiver I/O pin
4
5
6
7
8
9
Test Point
Test Point
Test Point
-5 Volts
No connection permitted
No connection permitted
No connection permitted
R strobe
Low level disables receiver
3 S loads
X
Power management
input
Controls transmitter power consumption in conjunction with pin 10 1 S load
10 Encoder enable
11 Case/signal GND
12 Case/signal GND
Controls transmitter power consumption in conjunction with pin 9 1 S load
13 Decoded data
envelope
High after reception of first half bit; goes low after reception of last 4 S drive
half bit (normally low in inactive state)
14 TP3 test point
15 TP1 test point
16 TP2 test point
17 -5 Volts
Alignment point: no electrical connection permitted
Alignment point: no electrical connection permitted
Alignment point: no electrical connection permitted
18 TP4 test point
Alignment point: no electrical connection permitted
19 Clock
Reconstructed clock; one clock pulse per input bit received
3 S drive
3 S drive
R
20 No connection
21 Decoded Data
22 No connection
23 +5 volts
NRZ reconstructed data. Sampled on clock rising edge
R
R
24 +5 volts
25 10 MHz encoder shift One cycle required per data bit. Must be high in first half of bit cell 1 S load
clock
26 NRZ serial input data Serial input to be Manchester encoded with the 20 MHz gated CK 1 S load
27 Encode envelope
Must be high to enable transmission; must go low before reception 1 S load
of last 20 MHz positive edge to complete transmission
28 20 MHz gated clock
(encoder)
Each bit to be encoded requires two positive edges of the 20 MHz 1 S load
CK. These edges must occur at 25ns and 75ns into the bit cell.
The end of transmission requires an additional edge in conjunction
with a logic low on the encode envelope. t , t < 5nsec.
R
F
29 Master reset
Logic low resets encoder
2 S load
reset pulse <15 nsec
30 No connection
31 No connection
32 XFMR secondary/
RX DATA input
Transmitter-Receiver I/O pin
33 XFMR secondary
Secondary isolated winding, same phase as outer conducter
Transformer lead for connection to outer conductor of tri-axial
34 XFMR primary/
TX DATA output
5
Aeroflex Circuit Technology
SCDCT1815 REV A 6/12/98 Plainview NY (516) 694-6700
Load and Drive Definitions
Absolute Maximum Ratings
CC (Pins 23, 24) +7 Volts Max
1 S load: requires
V
IIL = -2mA max., VIL = 0.8V max
VEE (Pins 7, 17) -7 Volts Max
IIH = 50µA max., VIH = 2.5V min CIN < 15 pf
Logic Input Voltage Applied:
1 S drive:
Logic Low
Logic High
-1.2V @ 10mA Max
+5.5 Volts
IOH = 50µA min., VOH = 2.5V min
IOL = -2 mA min., VOL = 0.5V max
Damage will not result from cable open circuits or
short circuits (on the transformer primary) of the
following types:
Power Consumption
•
•
•
Line-to-line
Line-to-ground
120V AC 60Hz common mode signal
Current (mA)
Typ
235
75
Max
305
100
585
315
ICC Standby mode
Environmental Parameters
IEE Standby mode
Operating Temperature -55°C to +100°C Case
Storage Temperature
Screened per individual test methods of
MIL-STD-883.
ICC 100% Transmission
IEE 100% Transmission
447
242
-55°C to +150°C
6
Aeroflex Circuit Technology
SCDCT1815 REV A 6/12/98 Plainview NY (516) 694-6700
C I R C U I T T E C H N O L O G Y
Ordering Information
Model Number
CT1815
Package
Plug-in Package
Flat Package
CT1815FP
Plug-In Package Outline
1.200 ±.005
Pin 1 & ESD
Designator
1.810
MAX
.100 TYP
Both Sides
.200
.270 ±.010
.018 ±.002
DIA
.120 ±.010
Both Sides
.100 ±.005
TYP
(17 Pins/Side)
Flat Package Outline
.180 MAX
.015 ±.003
.100 ±.005
.400 MIN
1.410
MAX
Lead 1 & ESD
Designator
1.810
MAX
.010 ±.002
Aeroflex Circuit Technology
35 South Service Road
Telephone: (516) 694-6700
FAX: (516) 694-6715
Plainview New York 11830
Toll Free Inquiries: 1-(800)THE-1553
Specifications subject to change without notice.
7
Aeroflex Circuit Technology
SCDCT1815 REV A 6/12/98 Plainview NY (516) 694-6700
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