Datasheet ACT4459, ACT4455 Datasheet (ACT)

eroflex Circuit T

– Data Bus Modules For The Future © SCD4455 REV A 1/29/98

ACT 4455 / 4459

SINGLE SUPPLY TRANSCEIVERS

FOR MIL-STD-1553/1760

Features

• Single 5 Volt Supply Operation

• Low Power Dissipation

CIRCUIT TECHNOLOGY

www.aeroflex.com/act1.htm

• Small Size & Light Weight

• Single Transceiver Save Space & Cost

• Outstanding MIL-STD-1553 performance

• Processed and Screened to Mil-STD-883
Specs

• Radiation Hard Dielectric Isolation
Monolithic construction for Severe
Environments

• Superior High Frequency Line Transient and
Input Ripple Rejection

• Input and Output TTL Compatible Design

• DESC SMD# 5962-96741

General Description:

The Aeroflex Circuit Technology
ACT4455 / 4459 series are next
generation monolithic transceiver
designs which provides full
compliance with MIL-STD-1553A/B
and 1760 requirements in the
smallest packages with low power
consumption and single power supply
operation.

The ACT4455 / 4459 series
performs the front-end analog
function of inputting and outputting
data through a transformer to the
MIL-STD-1553 data bus.

Design of these transceivers
reflects particular attention to active
filter performance. This results in low
bit and word error rate with superior
waveform purity and minimal zero
crossover distortion. Efficient
transmitter electrical and thermal
design provides low internal power
dissipation and heat rise at high as
well as low duty cycles.

TX DATA IN
TX DATA IN

TX INHIBIT

+5 V

+5V RTN

RX DATA IN
RX DATA IN

STROBE

DRIVER

AMPLIFIER

Block Diagram (without Transformer)

INPUT

echnology

Transmitter:

The Transmitter section accepts
bi-phase TTL data at the input and
when coupled to the data bus with a
1:2.5 ratio transformer, isolated on
the data bus side with two 52.5 Ohm
fault isolation resistors, and loaded by
two 70 Ohm terminations, the data
bus signal is typically 7.5 Volts P-P
at A-A' (See Figure 5). When both
DATA and DATA
or high, the transmitter output
becomes a high impedance and is
“removed” from the line. In addition,

inputs are held low

ACTIVE
FILTER

REFERENCE

ACTIVE
FILTER

OUTPUT
STAGE

COMP.

COMP.

TX DATA OUT

TX DATA OUT

RX DATA OUT

RX DATA OUT

Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY [phone]

an overriding “INHIBIT input
provides for the removal of the
transmitter output from the line. A
logic “1” applied to the “INHIBIT”
takes priority over the condition of
the data inputs and disables the
transmitter. (See Transmitter Logic

and produces two TTL signals at the
output. The outputs are DATA and
DATA

, and represent positive and
negative excursions of the input
beyond a pre-determined
threshold.(See Receiver Logic
Waveform. Figure 2.)

Waveform, Figure 1.) The
Transmitter may be safely operated
for an indefinite period with the bus
(point A-A') short circuited at 100%
duty cycle.

Receiver:

The Receiver section accepts

The pre-set internal thresholds will

detect data bus signals exceeding

1.20 Volts P-P and reject signals
less than 0.6 volts P-P when used
with a transformer. (See Figure 5 for
transformer data and typical
connection.)

bi-phase differential data at the input

Figure 1 — Transmitter Logic Waveforms Idealized*

DATA IN

A low level at the Strobe input
inhibits the DATA and DATA
outputs. If unused, a 2K pull-up to
+5 Volts is recommended

DATA IN

INHIBIT

LINE TO LINE

OUTPUT

Note:

DATA and DATA
and must be in the same state during off times (both high or low).

inputs must be complementary waveforms or 50% duty cycle average, with no delays between them,

Figure 2 — Receiver Logic Waveforms Idealized*

LINE TO LINE
INPUT

STROBE

DATA OUT

DATA OUT

* See Figure 8 For Actual Waveforms

2

Note overlap

Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY [phone]

Absolute Maximum Ratings

Operating case temperature -55°C to +125°C
Storage case temperature -65°C to +150°C
Power supply voltage -0.3 V to +7.0 V
Logic input voltage -0.3 V to +5.5 V
Receiver differential input ±10 V
Receiver input voltage (common mode) ±5 V
Driver peak output current 600 mA
Total package power dissipation over the full operating

case temperature rise

(Note: Normal operation conditions require one transceiver on and the

other off.)

2 Watts

Maximum junction to case temperature 10°C
Thermal resistance – junction to case 5°C/W

Electrical Characteristics — Driver Section

Input Characteristics, TX DATA in or TX DATA in (Notes 2 & 3 apply)

Parameter Condition Symbol Min Typ Max Unit

"0" Input Current VIN = 0.4 V I
"1" Input Current V

= 2.7 V I

IN

"0" Input Voltage V
"1" Input Voltage V

Inhibit Characteristics

"0" Input Current VIN=0.4V
"1" Input Current

=2.7V I

V

IN

"0" Input Voltage V
"1" Input Voltage V

Delay from TX inhibit, (0→1) to inhibited output t

Delay from TX inhibit, (1→0) to active output t
Differential output noise, inhibit mode

Differential output impedance (inhibited)

Note 1

Output Characteristics

Differential output level

R

L

=35 Ω

I

ILI

DXOFF

DXON

V

Z

V

O

ILD
IHD

ILD
IHD

IHI

ILI

IHI

NOI

OI

-0.2 -0.4

mA

1 40 µA

0.7

2.0 V

-0.2 -0.4

1.0 40

mA

µA

0.7

2.0
250 350

150 250

2 10

nS
nS

mV

2K

6 7.5 9 V

P-P

V

V
V

P-P

Ω

Rise and fall times(10% to 90% of P-P output)

t

r

100 200 300 nS

Output offset at point A-A' on Figure 5, 2.5µS

=35 Ω V

after midpoint crossing of the parity bit of the

R

L

OS

± 90

mV peak

last word of a 660µS message
Delay from 50% point of TX DATA or TX DATA

input to zero crossing of differential signal

t

DTX

120 250

nS

Note 1. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3KΩ

minimum

3

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Electrical Characteristics — Receiver Section

Parameter Condition Symbol Min Typ Max Unit

Differential Receiver Input Voltage Range
(See Figure 5, point P–P')
Common Mode Rejection Ratio (Note 3) CMRR

Strobe Characteristics (Logic "O" Inhibits Output)

"0" Input Current VS=0.4 V

TXFMR

2.12:1

V

IDR

I

IL

14

20

V

P-P

45 dB

-0.2

-0.4

mA

"1" Input Current V

=2.7V

S

"0" Input Voltage
"1" Input Voltage V
Strobe Delay (Turn-on or Turn-off)

Threshold Characteristics (Sinewave Input)

Input Threshold Voltage (referred to the bus)

100KHz–1MHz

Output Characteristics – RX DATA and RX DATA

"1" State I
"0" State I

Delay, (average) from Differential Input Zero
Crossings to RX DATA and RX DATA

Output

50% points

= -0.4 mA

OH

= -4.0 mA

OL

V

V
V

t

DRX

V

t

OH

OL

I

SD

IH

TH

1 +40

IL

IH

2.0

0.7

50 100

0.60 0.82 1.10 V

µA

V
V

nS

P-P

2.5 3.7 V

0.35

0.5

V

340 500 nS

Power Data

Power Supply Currents – Per Channel

Transmitter Standby

25% duty cycle 150 175

50% duty cycle

100% duty cycle

Power Supply Voltage

Operating Power Supply Voltage Range

Note 2: V

Note 3: When measured at point A-A’ with ± 10 Volt peak, line to ground, DC to 2MHz
Note 4: Typical power is measured with V

= 5 Volts ±0.1 V, bypassed by 2.2µF (Tantalum recommended) Capacitor minimum. All measurements &

cc

specifications apply over the temperature range of -55°C to +125°C (case temperature) unless otherwise
specified.

Note 4

I

CC

18 30

300 350
600 700

at point A-A’ = 7.5 V

bus

4

P-P

V

CC

+4.75 +5.00 +5.50

mA

V

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Figure 3 – Transmitter (TX) Output Wave form Figure 4 – Transmitter (TX) Output offset

POWER DISSIPATION

MILLIWATTS

LAST BIT

Magnified View

OUTPUT OFFSET*

OUTPUT OFFSET

2.5 µsec

90%

6V P-P MIN
9V P-P MAX

10%

t

*

r

Rise and fall times measured at point A-A' in Figure 5

*

t

*

f

0 Volts

0 volts

*Offset measured at point A-A' in Figure 5

Figure 5 – Typical direct transformer connection Figure 6 – Power Dissipation vs. Duty Cycle

(Total hybrid with one channel transmitting

and the other not powered)

70

TX DATA OUT

TX DATA
RX DATA
RX DATA IN

OUT
IN

Ω

B

B'

52.5Ω
A

Center

Tap

A'

52.5Ω

N1:N2

P

P'

Transformer turns ratios:
N1:N2 = 1:2.5
N1:N3 = 1:1.77
Use Technitrol 1553-45 or equivalent

70Ω

N1:N3 for
Stub
Coupling

2000
1800
1600
1400
1200
1000
800

Note:Vcc=5 Volts,Transformer ratio 1:2.5, V

600
400
200
0

0 10 20 30 40 50 60 70 80 90 100

Maximum

DUTY CYCLE – PERCENT

Typical

(pt A-A') at 7.5 Volts P-P

bus

*

5

Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY [phone]

Figure 8 ACTUAL HYBRID WAVEFORMS* — 25°C TYPICAL

Oscilloscope used is a TEK TDS540 with Probe 6139A.

START OF WORD – 33 WORD TRANSMISSION

TX DATA IN

CH 2

BUS OUT

Point A–A'
See Figure 5

CH 1

RX DATA OUT

CH 3

RX DATA

OUT

CH 4

END OF WORD – 33 WORD TRANSMISSION

TX DATA IN

CH 2

BUS OUT

Point A–A'
See Figure 5

CH 1

RX DATA OUT

CH 3

RX DATA

OUT

CH 4

*

6

Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY [phone]

Figure 7 – Pin Numbers & Functions

ACT4455/4459

Pin # Function

1 TX DATA OUT
2 +5V
3 +5V
4 TX DATA
5 TX DATA

OUT

OUT
6 GROUND 1
7 NC
8 NC
9 +5V

10 RX DATA OUT
11 STROBE
12 NC
13 RX DATA

OUT
14 NC
15 +5V
16 GROUND 3
17 NC
18 RX DATA IN
19 RX DATA

IN
20 NC
21 NC
22 GROUND 4
23 +5V
24 INHIBIT
25 TX DATA IN
26 TX DATA

IN
27 GROUND 2
28 TX DATA OUT

7

Aeroflex Circuit Technology SCD4455 REV A 1/29/98 Plainview NY [phone]

CIRCUIT TECHNOLOGY

Configurations and Ordering Information

Model No.

ACT 4455 5962-96741
ACT 4459 5962-96741

DESC No. Receiver Data level

Case

Normally Low Rx

Normally High Rx

ACT4455/4459 LCC LEADLESS CHIP CARRIER

0.055

0.045

0.055

0.045

0.055

0.045

0.028

0.022

LCC Single
LCC Single

Configuration

0.458

0.442

0.458

0.442

Notes

2. Pins are equally spaced at 0.100±0.002 tolerance,
non-cumulative, each row

Aeroflex Circuit Technology
35 South Service Road
Plainview New York 11830

Specifications subject to change without notice.

Toll Free Inquiries: 1-(800)THE-1553

8

0.100
MAX

Telephone: [phone]
FAX: [phone]