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CT1775 Schematic ( PDF Datasheet ) - Aeroflex Circuit Technology

Teilenummer CT1775
Beschreibung CT1775 Universal MacAir/1553 Dumb RTU Hybrid
Hersteller Aeroflex Circuit Technology
Logo Aeroflex Circuit Technology Logo 




Gesamt 14 Seiten
CT1775 Datasheet, Funktion
CT 1775
Universal MacAir/1553 Dumb RTU Hybrid
PRELIMINARY DATA SHEET
www.aeroflex.com/Avionics
FEATURES
CT1775 Replaces DDC BUS-65201
Includes:
- Universal Transceiver
- Encoder/decoder
- Dual Rank I/O Registers
- Fail-safe Timer
- Clock Oscillator
Simple Controls for Single or Dual Redundant Data Bus Configurations
Provides Flags for:
- Own Address (With Parity)
- Mode Code
- Broadcast
- Time Out
- Valid Word
- Sync Type
16 Bit or 8 Bit 3-State
- Parallel I/O and Serial Out
Wraparound Built-In Test
MIL-PRF-38534 Compliant Circuits Available
Packaging – Hermetic Metal
- 68 Pin, 1.85" x 1.6" x .19" Plug-In Type Package
DESCRIPTION
The CT1775 Universal MACAIR/1553 Dumb Remote Terminal Unit (RTU) consists of a transceiver, and encoder/decoder, control
logic, dual rank I/O registers and internal clock oscillator packaged in a 1.6" x 1.9" hermetic hybrid. It provides all the functions
required to interface between a MACAIR (sinusodial) or MIL-STD-1553 (Trapezoidal) serial MUX data bus and a subsystem parallel
3-state data highway. Utilizing several ASIC ICs, the CT1775 provides sufficient handshaking, control and data lines to permit
versatile operation as a remote terminal, a bus controller or a bus monitor, in either single or dual redundant data bus configurations.
As a transmitter, the CT1775 accepts 8 bit or 16 bit parallel date from the subsystem, and outputs serial Manchester II coded
Command, Status or Data words, under subsystem control. As a receiver, it accepts serial MIL-STD-1553 or MACAIR transmissions
and transfers all Command, Status and Data words to the 8 bit or 16 bit data highway, under subsystem control. The CT1775 also
provides flags to the subsystem when Broadcast, Mode Code, and Own Address (with parity) commands are decoded.
The CT1775 contains a terminal fail-safe timeout circuit which flags message lengths exceeding 768µs, and terminates serial data
transmission. Wraparound selftest is initiated by a control line which causes the encoder serial output to be connected to the decoder
input. The CT1775 provides a serial output of decoded words, thus allowing Command Word look ahead, for the fastest terminal
response.
SCDCT1775 Rev B






CT1775 Datasheet, Funktion
SERIAL DATA OUT
SYNC
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 P
19 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 0
ESE OUT
START
CYCLE
STROBE
SYNC
STROBE DATA
DATA SENT
END CYCLE
ENC ENABLE
DON’T CARE
SYNC SEL
VALID SYNC
DON’T CARE
SEND DATA
(LOAD DATA)
16µs
LATCH DATA
TRI-STATE DATA
VALID DATA
DON’T CARE
DON’T CARE
DATA SELECT
DON’T CARE
FIGURE 2 – TRANSMIT MODE TIMING
SERIAL DATA IN
DSC OUT
TAKE DATA
COMM / DATA SYNC
SYNC
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 P
SYNC
15 14 13
19 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 0 1 2 3 4 5
START CYCLE
TAKE DATA
STROBE DATA
END CYCLE
PREVIOUS STATE
16µs
CURRENT SYNC
SERIAL DATA OUT
PREVIOUS STATE
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
UNDEFINED
15
DATA SELECT 1
TRI-STATE DATA 1
DON’T CARE
CURRENT DATA
VALID WORD 2
PREVIOUS STATE
FLAG OUTPUTS3
PREVIOUS STATE
NOT VALID
FLAGS VALID 3
BIT STATUS 4
NOT VALID
BIT STATUS VALID4
NOTES:
1. Parallel data is held continuously in second rank receiver register, and may be enabled onto the tri-state output at any time with a LOW on DATA SELECT.
2. VALID WORD will remainLOW for 20µsec then go HIGH, if a valid sync is not received.
3. FLAG OUTPUTS are valid only when VALID WORD is LOW. Flags are MODE CODE, RT Enable, BROADCAST and VAL CMD WD.
4. BIT STATUS is valid only if wraparound transmit plus receive cycle has been performed. LATCH DATA must be HIGH, and either S/T SELECT or
RX STROBE must be HIGH for the full wraparound cycle duration.
FIGURE 3 – RECEIVE MODE TIMING
SCDCT1775 Rev B
6

6 Page









CT1775 pdf, datenblatt
PIN FUNCTION AND LOADING TABLE (con’t)
PIN
#
NAME
IIH IIL IOH IOL
(µA) (mA) (mA) (mA)
DESCRIPTION
66 -12V
67 RX DATA IN
68 TX DATA OUT
-12V power supply input.
Receiver input.
Inverted transmitter output.
NOTES: In the above table, the symbols are defined as follows: *Indicates use of an internal pull-up resistor.
IIH = maximum input HIGH current with VIN = 2.5 volts.
IIL = maximum input LOW current with VIN = 0.4 volts.
IOH = maximum output HIGH current for VOUT = 2.5 volts minimum.
IOL = maximum output LOW current for VOUT = 0.4 volts maximum.
SCDCT1775 Rev B
12

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