
Aeroflex Circuit Technology
SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700
6
22
23
24
25
No connection
+5 volts
+5 volts
10 MHz encoder shift
clock
NRZ serial input data
Encode envelope
One cycle required per data bit. Must be high in first half of bit cell
1 S load
26
27
Serial input to be Manchester encoded with the 20 MHz gated CK
Must be high to enable transmission; must go low before reception
of last 20 MHz positive edge to complete transmission
Each bit to be encoded requires two positive edges of the 20 MHz
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.
Logic low resets encoder
1 S load
1 S load
28
20 MHz gated clock
(encoder)
1 S load
29
Master reset
reset pulse <15 nsec
No connection
No connection
TXDATA output/
RX DATA input
XFMR secondary
2 S load
30
31
32
Transmitter-Receiver I/O pin (usually connected to pin 33)
33
Secondary isolated winding, same phase as outer signal
conductor
Transformer lead for connection to outer signal conductor of
tri-axial
34
XFMR primary/
TX DATA output
Functional Description and Pinout (continued)
Pin
#
Pin Name
Function
Load or
Drive
Load and Drive Definitions
1 S load: requires
I
IL
= -2mA max., V
IL
= 0.8V max
I
IH
= 50μA max., V
IH
= 2.5V min C
IN
< 15 pf
1 S drive:
I
OH
= 50μA min., V
OH
= 2.5V min
I
OL
= -2 mA min., V
OL
= 0.5V max
Absolute Maximum Ratings
V
CC
(Pins 23, 24) +7 Volts Max
V
EE
(Pins 7, 17)
Logic Input Voltage Applied:
Logic Low
Logic High
-7 Volts Max
-1.2V @ 10mA Max
+5.5 Volts
When used with the internal transformer, the
CT1698 will not be damaged by cable open circuits
or by short circuits of the following types:
Line-to-line
Line-to-ground
To voltage sources of 0 to 115 volts
alternating current, 60 hertz, line-to-ground
Environmental Parameters
Operating Temperature
Storage Temperature
Screened per individual test methods of
MIL-STD-883
-55°C to +100°C Case
-55°C to +150°C
Power Consumption
Current (mA)
Typ
Max
I
CC
Standby mode
I
EE
Standby mode
I
CC
100% Transmission
I
EE
100% Transmission
325
450
85
105
380
510
125
160