CT1698 Datasheet, PDF (6/7 Pages) Aeroflex Circuit Technology – CT1698 MIL-STD-1397 Type E 10MHz Low Level Serial Interface

Functional Description and Pinout (continued)
Pin
#
Pin Name
Function
22 No connection
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
clock
26 NRZ serial input data Serial input to be Manchester encoded with the 20 MHz gated CK
27 Encode envelope
Must be high to enable transmission; must go low before reception
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
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
30 No connection
31 No connection
32 TXDATA output/
RX DATA input
Transmitter-Receiver I/O pin (usually connected to pin 33)
33 XFMR secondary
Secondary isolated winding, same phase as outer signal
conductor
34 XFMR primary/
TX DATA output
Transformer lead for connection to outer signal conductor of
tri-axial
Load or
Drive
1 S load
1 S load
1 S load
1 S load
2 S load
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
Power Consumption
I_CC Standby mode
I_EE Standby mode
I_CC 100% Transmission
I_EE 100% Transmission
Current (mA)
Typ
Max
325
450
85
105
380
510
125
160
Absolute Maximum Ratings
V_CC (Pins 23, 24) +7 Volts Max
V_EE (Pins 7, 17) -7 Volts Max
Logic Input Voltage Applied:
Logic Low
-1.2V @ 10mA Max
Logic High +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 -55°C to +100°C Case
Storage Temperature -55°C to +150°C
Screened per individual test methods of
MIL-STD-883
Aeroflex Circuit Technology
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SCDCT1698 REV A 6/12/98 Plainview NY [phone]