Document
CT1990/1 Series
MIL-STD-1553B Remote Terminal, Bus Controller, or Passive Monitor Hybrid with Status Word Control
Features
• Performs the Complete Dual-Redundant Remote Terminal, Bus Controller Protocol and Passive Monitor Functions of MIL-STD-1553B • Automated Self-Test Functions • Allows setting of the Message Error Bit on illegal commands • Provides programmable control over Terminal Flag and Subsystem Flag Status Bits • MIL-PRF-38534 Compliant Circuits Available • 50 mw Typical Power Consumption • Small Size • Available in Ceramic Plug-in Package Configuration CIRCUIT TECHNOLOGY • Compatible with all ACT Driver/Receiver Units • 5V DC Operation • Full Military (-55°C to +125°C) Temperature Range • DESC SMD# 5962–94775: Released CT1990, Pending CT1991
1
General Description
The CT1990/1 Series is a monolithic implementation of the MIL-STD-1553B Bus Controller, Remote Terminal and Passive Monitor functions. All protocol functions of MIL-STD-1553B are incorporated and a number of options are included to improve flexibility. These features include programming of the status word, illegalizing specific commands and an independent loop back self-test which is initiated by the subsystem. This unit is directly compatible with all transceivers and microprocessor interfaces such as the CT1611 and CT1800 produced by Aeroflex Incorporated. Block Diagram (With Transformers)
Encoder
Interface Unit
Sub Address & Word Count Outputs
BUS "0"
T/R Hybrid Driver Select & Enable T/R Hybrid
Decoder "O"
Status Word Control
Program Inputs
Discrete Outputs
BUS "1"
Decoder "1"
Internal Highway Control
Control Inputs
Terminal Address Inputs
CT1990/1
eroflex Circuit Technology – Data Bus Modules For The Future © SCD1990 REV B 8/21/00
Absolute Maximum Ratings
Parameter
Supply Voltage (VDD) Input or Output Voltage at any Pad Storage Case Temperature
Range
-0.3 to +7.0 -0.3 to (VDD + 0.3) -65 to +150
Units
V V °C
Recommended DC Operating Conditions
Parameter
Vcc Power Supply Voltage Vcc VIH High Level Input Voltage, Vcc = 5V VIL Low Level Input Voltage, Vcc = 5V
Min
4.5 2.2
Typ
5.0
Max
5.5
Unit
V V
Notes
1,2 1,2
0.7
V
Electrical Characteristics
(TA = -55°C to +125°C)
Parameter
VOH High Level Output Voltage VOL Low Level Output Voltage IIH High Level Input Current
Test Conditions
Vcc = 4.5V Vcc = 4.5V Vcc = 5.5V, VIN = 2.4V
Min
2.4
Max
Unit
V
Notes
4 4 2 3 2 3 4
0.4 -200 -25 -700 -400 -900 -400 20
V µA µA µA µA mA
IIL Low Level Input Current
Vcc = 5.5V, VIN = 0.4V
-400 -25
ICC Supply Current
Vcc = 5.5V
Notes: 1. RTAD 0/1/2/3/4 and RTADPAR ONLY. 2. ALL Inputs and Bidirectionals other than those in Note 1. 3. lOL max = 3mA / lOH max = -2mA TX INHIBIT 0/1 and TX DATA/DATA ONLY. IOL max = 2mA / lOH max = -1 mA. ALL remaining Outputs and Bidirectionals. 4. Input Clock (running) = 6Mhz, ALL remaining Inputs are Open and ALL Outputs and Bidirectionals have no load.
Clock Requirements
Frequency Stability -55°C to +125°C Maximum Asymmetry Rise.