
CT1487M/CT1589M
1
FEATURES
I
Available in
±
15V (CT1487M) and
±
12 V (CT1589M)
versions
I
AC interstage coupling prevents static burnout
I
Receiver filtered to improve S/N ratio of system
I
Dissipates only 1.3 watt total at 25% transmitting
duty cycle (dual unit - 1.8 watts total). 100% duty
cycle permissible at 125
°
C case temperature
I
20 mV typical output offset
I
Meets MIL-STL-1553A/B
I
Available to Standard Military Drawings (see
Ordering Information)
I
24 pin double dip package or flat pack for single unit
I
36 pin double dip package or flat pack for
dual unit
I
TTL compatible
Note: All data shown is for a single transceiver unless
otherwise noted. Dual transceivers are two completely
independent units in a common package.
GENERAL DESCRIPTION
The CT1487M/CT1589M family of single and dual
transceivers is a second generation series incorporating
monolithic bipolar devices for improved reliability and
producibility. For thermal considerations, the drive stage
transistors are “off” the bipolar array. Input/output signals
are compatible with both MIL-STD-1553A and B systems.
DETAILED DESCRIPTION
RECEIVER DESCRIPTION
The Receiver section accepts bi-phase differential data
at the input and produces two TTL signals at the output.
The outputs are RX DATA OUT and RX DATA OUT and
represent positive and negative excursions, respectively,
of the input beyond a predetermined threshold. See Figure
2 for receiver logic waveforms.
The positive and negative thresholds are designed for
optimum word error rate. The receiver begins to detect
Data Bus signals (1 MHz, sinusoidal) that exceed 0.9 volt
nominal peak-to-peak when used with the specified
transformer. See Figure 4 for typical input/output
connections.
If the RECEIVER STROBE input is LOW, the RX DATA
OUT and RX DATA OUT are inhibited. If unused, a 2K-
ohm pullup to +5V is recommended.
Note: See ORDERING INFORMATION for units with
inverted outputs. (Pg 7)
CT1487M/CT1589M
MIL-STD-1553 LOW POWER SINGLE AND DUAL TRANSCEIVERS
3122-1.2
Figure 1: Functional Diagram, CT1487M
OCTOBER 1991