ACT CT2543-FP-701, CT2543-FP, CT2543-701, CT2543 Datasheet

CT 2542 / CT2543

www.aeroflex.com

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Dual Redundant Remote Terminal

FOR MIL-STD-1553B

Features

• CT2542 Replaces DDC BUS-65142 and BUS-65144

• CT2543 Replaces DDC BUS-65143 and BUS-65145

• Functions as a Complete Remote Terminal Unit

• Supports 13 Mode Codes, Illegalization of Codes Allowed

• Transfers Data with DMA Type Handshaking

• Latched Outputs for Command Word and Word Count

• 14 Bit Built-ln-Test Word Register

• 4 Error Flag Outputs

• Advanced Low Power VLSI Technology

• DESC SMD# 5962–89798 Approved

CIRCUIT TECHNOLOGY

ISO

9001

I

General Description

The CT2542 contains 2 transceivers, 2 encoder/decoders, bit processors and complete Remote Terminal (RT)
logic. The device is constructed using Aeroflex advanced VLSI custom chip and hybrid technology. It
functions as a complete dual redundant MIL-STD-1553B RT Unit supporting all 13 mode codes for dual
redundant operation. The CT2542 is a pin-for-pin functional equivalent of the DDC BUS-65142/144 and
performs parallel data transfers with a DMA type handshake. Multiple error flag outputs and host access to
many of the RT Status Word bits are just some of the features that make this part ideal for many RT
applications. The unit has an operating range of -55°C to + 125°C. Aeroflex is a MIL-PRF-38534 Certified
Manufacturer. See "Ordering Information" (last sheet) for CT2543.

DATA BUS A

DATA BUS B

DUAL

TRANSCEIVER

ENCODER/
DECODER

ENCODER/
DECODER

MIL-STD-1553B

PROTOCOL

AND

BIT

PROCESSING

LOGIC

I/O

INTERFACE

DB0-DB15
A0-A11

ERROR FLAG
TIMING FLAGS
STATUS BITS

Figure 1 – Functional Block Diagram

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Absolute Maximum Ratings

Parameter Limits Units

Power Supply Voltage (VEE) +0.3 to -18.0 Volts

Power Supply Voltage (V

CCL) -0.3 to +7.0 Volts

Receiver Differential Input ±20 (40Vp-p) Volts

Receiver Input Voltage ±15 Volts

Driver Output Current +200 mA

Transmission Duty Cycle at T

Operating Case Temperature Range (T

C = 125°C 100 %

C) -55 to +125 °C

Power and Thermal Data (Transceiver and Logic Section)

Parameter/Conditions Symbol Min Typ Max Units

Power Supply Voltage

V

EE

V

CCL

-14.25

4.5

-155-15.75

5.5

V
V

Power Dissipation of most critical (hottest) device in

hybrid during continuous transmission (100% Duty
Cycle)

P

C

350 mW

Note 1

Thermal Resistance, most critical device

Ø

JC

60 °C/W

Junction to case temperature rise of most critical device

at 100% duty cycle T

Total supply current standby mode, or transmitting at

less than 1% duty cycle (e.g. 20µs of transmission
every 2ms or longer interval)

Total supply curren transmitting at 1Mhz into a 35-ohm

EE @ 50%

I

load at point A in Figure 2

EE @ 100%

I

I

CCL

I

JC

EE

60 80 °C

mA
mA

Note 2

mA

50

50
70

175

Note 3

270

mA

Note 3

Note 1: Decreases linearly to zero at zero duty cycle.
Note 2: I
Note 3: Decreases linearly to applicable "standby" values at zero duty cycle.

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limit does not change with mode of operation or duty cycle.

CCL

1

Electrical Characteristics (Receiver Section)

Parameter/Conditions Symbol Min Typ Max Units

Differential input impedance
DC to 1MHz, Point B, Figure 2

Z

IN

2K Ω

Differential voltage range

Input common mode voltage
range

Common mode rejection ratio
(from point A, Figure 2)

Threshold characteristics
(Sine wave at 1MHz)
Note: Threshold voltages refer to point A, Figure 2.

V

V

DIR

ICR

±20V Vpeak

±10V Vpeak

CMMR 40 dB

V

th

0.6 1.2 Vp-p

Electrical Characteristics (Transmitter Section)

Parameter/Conditions Symbol Min Typ Max Units

Differential output level at point B, Figure 2 (145 ohm load)

Rise and Fall times (10% to 90% of p-p output)

V

T

O

r

24 35 Vp-p

100 300 nS

Output offset at point A in Figure 2 (35-ohm load) 2.5us
after mid-bit crossing of
parity bit of last word of a
660us message

Differential output noise

V

V

OS

NOI

±20 ±90 mV Vpeak

10 mV pp

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Logic Characteristics

Symbol Parameter Min Typ Max Units Conditions

V

IH

V

IL

I

IL

I

IH

Input l -20 +20 µA Note 2A

I

IL

I

IH

Input l -20 -200 µA

I

IL

I

IH

V

OH

V

OL

Note 1 For INPUT pins 12,13,14,15, 53, 54, 55.

VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V

Note 2 All remaining INPUTS other than in Note 1.

VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V

Input "1" 2.4 VDC
Input "0" 0.7 VDC

Input l -80 -400 µA Note 1A
Input l -40 -200 µA Note 1B

Input l -20 +20 µA Note 1B

Input l -40 -400 µA
Output "1" 2.7 VDC Note 3A/4A
Output "0" 0.4 VDC Note 3B/4B

Note 5

Note 3 For OUTPUT pins 4 through 11 and 43 through 50.

A. @ VCC = 4.5V and IOH = 2mA
B. @ VCC = 4.5V and IOL = 4mA

Note 4 All remaining OUTPUTS other than in Note 3.

A. @ VCC = 4.5V and IOH = 1mA
B. @ VCC = 4.5V and IOL = 2mA

Note 5 For INPUT pins 4-11, 43-50.

VCC= 5.5V
A. @ VIL = 0.4V
B. @ VIH = 2.4V

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DATA TX/RX

Transformer Coupled Stubs

STUB

2 : 1

ISOLATION

1 : 1.41

55

70Ω

Ω

2542

DATA TX/RX

C

Zoi

Direct Coupled Stubs

STUB

DATA TX/RX

2542

DATA TX/RX

NOTES:

1. Point C, Vo = 18 Vpp Minimum

2. Transformer self Impedance ≥ 3KΩ at 1MHz

CMT for transformer coupled stubs

3. V

CMD for direct coupled stubs

V

1.4 :1

B

55

55Ω

Zoi

A

55Ω

VCMT = ±10 VPK

DC to 2MHZ

Ω

A

35Ω 35Ω

±V

CMD

+

-

Figure 2 – Typical Bus Coupling

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Figure 3 – Timing Diagram, Transmit One Word

NBGT

INCMD

DTREQ

DTGRT

DTACK

STATEN

A5 (D/C)

DTSTB

A11 (T/R)

R/W

A6 - A10

A0 - A4

DB0 - DB4

BUFFENA

TRISTATE

COMMAND WORD

ILLCMD STROBED IN

1.1

µs (STATUS BITS STROBED IN)

(SRQ,BUSY,SSFLAG,RDBC,RTFLAG)

TRISTATE TRISTATE

WORD COUNT

STATUS WORD

DATA WORD FROM SUBSYSTEM

ADDRESS = 00h

ADDRESS = 01h

SUB ADDRESS

PREVIOUS STATE

4.5

µs

1

µs

125n

s

100n

s MAX

2.1µ

s MAX

4.5 ± 0.5µ

s

11µ

s

± .75µ

s

15.5µ

s

max

100n

s MAX

DATA WORD FROM SUBSYSTEM STROBED IN

DON’T CARE

6.5µ

s ±0.5µs

STATUS SYNC 15 14 13 0 P DATA SYNC 15 14 13 0 P

COMMAND SYNC 15 14 13 1 0 P

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