CT1815 Datasheet, PDF (5/7 Pages) Aeroflex Circuit Technology – CT1815 10MHz Low Level Serial Interface for MIL-STD-1397 Type D

Functional Description and Pinout
Pin
#
Pin Name
Function
Load or
Drive
1 No connection
2 No connection
3 XFMR secondary/
RX data input
Transmitter-receiver I/O pin
4 Test Point
No connection permitted
5 Test Point
No connection permitted
6 Test Point
No connection permitted
7 -5 Volts
8 R_X strobe
Low level disables receiver
3 S loads
9 Power management Controls transmitter power consumption in conjunction with pin 10 1 S load
input
10 Encoder enable
Controls transmitter power consumption in conjunction with pin 9 1 S load
11 Case/signal GND
12 Case/signal GND
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
Alignment point: no electrical connection permitted
15 TP1 test point
Alignment point: no electrical connection permitted
16 TP2 test point
Alignment point: no electrical connection permitted
17 -5 Volts
18 TP4 test point
Alignment point: no electrical connection permitted
19 Clock_R
20 No connection
Reconstructed clock; one clock pulse per input bit received
3 S drive
21 Decoded Data_R
22 No connection
NRZ reconstructed data. Sampled on clock_R rising edge
3 S drive
23 +5 volts
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 Each bit to be encoded requires two positive edges of the 20 MHz
(encoder)
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_R, t_F < 5nsec.
29 Master reset
Logic low resets encoder
reset pulse <15 nsec
1 S load
2 S load
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
34 XFMR primary/
TX DATA output
Transformer lead for connection to outer conductor of tri-axial
Aeroflex Circuit Technology
5
SCDCT1815 REV A 6/12/98 Plainview NY [phone]