CT2512-PCB Aeroflex Circuit Technology, CT2512-PCB Datasheet - Page 7

• Manufacturer Part Number: CT2512-PCB
• Description: Dual Redundant Remote Terminal For Mil-std-1553b In Pcb Style
• Manufacturer: Aeroflex Circuit Technology

Plug-In
Pkg
69
70
71
72
73
74
75
76
77
78
SCDCT2512PCB Rev A
NOTES:
1.
2.
3.
4.
5.
6.
7.
When INCMD is LOW during the DTSTR immediately following NBGT, A0 through A4 are valid and equal to WC0
through WC4 of the received command word. The remaining time while INCMD is LOW and A5 through A9 are not
all zeros or ones (i.e. MODE), A0 through A4 are equal to the last current word count plus one. When INCMD is HIGH
and A5 through A9 are not MODE, A0 through A4 represent the current word counter. If A5 through A9 are equal to
MODE, A0 through A4 are equal to WC0 through WC4 of the received command word, independent of the state of
INCMD.
Pulse width is typically 166 ns.
Do not connect.
Pulse width is typically 500 ns.
Pin 67 for Plug-In Pkg, and pin 66 for Flat Pkg - BUF ENA: This pin is typically tied to DTACK, causing the device
to drive the shared data bus only while DTACK is active. If desired BUF ENA can be gounded. The data will remain
latched on the data bus pins for 19 µs from DTSRB and 4 µs for the last word of a message as the devices status word
or BIT word is transferred to the BC (STATEN or BITEN low). Once the STATUS or BIT word transfer is complete,
the data bus will automatically again contain the last data word. The device will automatically switch the direction of
the internal buffers during a transmit operation.
Do not connect.
For Flat Pkg, pins 1, 41, 42, and 82 are no connections.
Flat
Pkg
62
60
58
56
54
52
50
48
46
44
TXDATAOUT A
RXDATAIN A
MESS ERR
RT FLAG
Function
SS FLAG
STATEN
TEST 1
GND A
BUSY
V
CC
TERMINAL CONNECTIONS AND PIN FUNCTIONS (con’t)
A
Remote terminal flag - Input signal used to control the terminal flag bit in the status
register. If LOW when the status word is updated, the terminal flag bit would be set; if
HIGH, it would be cleared. Normally connected to RTFAIL; (pin 28, Plug-In Pkg); (pin
67, Flat Pkg).
Factory test point - DO NOT USE. (See note 6).
Subsystem busy - Input from the subsystem used to control the busy bit in the status
register. If LOW when the status word is updated, the busy bit will be set; if HIGH, it will
be cleared. If the busy bit is set in the status register, no data will be requested from the
subsystem in response to a transmit command. On receive commands, data will still be
transferred to subsystem.
Subsystem flag - Input from the subsystem used to control the subsystem flag bit in the
status register. If LOW when the status word is updated, the subsystem flag will be set; if
HIGH, it will be cleared.
Message error - Output signal that goes LOW and stays low whenever there is a format or
word error with the received message over the 1553 data bus. Cleared by the next NBGT.
Input from the HIGH side of the primary side of the coupling transformer that contacts to
the A channel of the 1553 bus.
Power supply return connection for the A channel transceiver.
+12 / +15 Volt input power supply connection for the A channel transceiver.
LOW output to the primary side of the coupling transformer that connects to the A
channel of the 1553 bus.
Status word enable - LOW level active output signal present when the status word is
enabled on the parallel data bus.
Description
7