Isolation
Transformer
Direct
Or
Transformer
Coupler Box
Data Bus
1553
RX
Input
Filter
Comparator
RX
Receive
Logic
RECEIVER
RXENA
RX_L
RX
TXINH
BUS_L
BUS
+5V
TRANSMITTER
TX
Transmit
Logic
Shaping
Network
TX
TX_L
Figure I: NHI-1573 Block Diagram
(Each Channel)
Mil-Std-1553/1760 Products
NHI-1573 Series
+5V Monolithic Dual Transceivers
Features:
Description:
Fully Compliant, Mil-Std-1553A & B, Mil-Std-1760,
MacAir Dual Transceivers!!
Single +5V +/- 10% Supply !!
0.95 Watts Maximum Power Dissipation @ 100%
Duty Cycle !!
Output Driver Withstands Short Circuit Fault
Indefinitely with Built-In Shutdown/Recovery
Circuit !!
Proprietary Monolithic Design Provides Superior
Radiation Tolerence, Reliability, Noise Performance
and Thermal Impedance !!
Total Dose Radiation Tolerance 1 Meg Rad (Si) !!
The NHI-1573 series of Mil-Std-1553/1760 monolithic
dual transceivers is available in a 0.800" x 0.600", 24
pin ceramic flatpack package.
Each receiver converts the 1553 bus bi-phase data to
complementary RX and RX_L TTL digital outputs for
use by the manchester decoder. The device provides
independent receiver enables for each channel.
The transmitters will output bi-phase manchester to
the coupling transformer when the TX and TX_L
inputs are driven by complementary TTL digital data.
The device
provides an independent transmitter inhibit
TXINH for each channel.
The transmitter outputs are connected to the receiver
inputs internal to the device for each channel. This
results in only two connections BUS & BUS_L to the
coupling transformer per channel.
NATIONAL HYBRID, INC.
2200 Smithtown Avenue, Ronkonkoma, NY 11779
(516) 981-2400 FAX 516-981-8888
Parameter
Condition
Symbol
Min
Typ
Max
Units
POWER SUPPLY
REQUIREMENT
Vcc
4.5
5.5
V
TOTAL SUPPLY CURRENT
Vcc=5.0V, Not Transmitting
Icc1
70
80
mA
Vcc=5.0V, Transmit one channel @
50% duty cycle
Icc2
320
340
mA
Vcc=5.0V, Transmit one channel @
100% duty cycle
Icc3
570
615
mA
POWER DISSIPATION
Vcc=5.0V, Not Transmitting
Pd1
0.4
W
Vcc=5.0V, Transmit one channel @
100% duty cycle
Pd2
0.95
W
OPERATING
TEMPERATURE
Junction
Tj
-55
165
C
Case
Tc
-55
125
C
Storage
Ts
-55
165
C
THERMAL IMPEDANCE
Junction to Case
jc
4
C/W
LOGIC I/O
RXENA_A, TXA, TXA_L,
TXINH_A, RXENA_B, TXB,
TXB_L, TXINH_B
Vcc= 5.5V, Vil= 0.0V
Iil
-0.4
mA
Vcc= 4.5V, Vih= 2.7V
Iih
20
uA
RXA, RXA_L, RXB, RXB_L
Vcc= 5.5V, Iol= -4mA
Vol
0.4
V
Vcc= 4.5V, Ioh= 400 uA
Voh
2.7
V
RECEIVER
Differential
Rin
20
k
Input Capacitance
Differential
Cin
5
pF
Common Mode Rejection Ratio
CMRR
40
dB
Input Level
Differential
Vin
40
Vpp
TRANSMITTER
Output Voltage
Across 140
load
V
out
29
36
Vpp
Rise/Fall Time
10% to 90% of peak to peak output
t
r
, t
f
100
150
300
nS
Across 35
load
Vdyn
-90
90
mV
Ouput Noise
Differential
Vnpp
10
mVpp
Output Resistance
Differential, not transmitting
Rout
10
k
NHI-1573 Series
TABLE I: Electrical Specifications
Pin# Function
Pin#
Function
1 BUS_A
24 TXA_L
2 BUS_A_L
23 TXA
3 GND_A
22 TXINH_A
4 RXA
21 GND_A
5 RXENA_A
20 +5V_A
6 RXA_L
19 GND_A
7 BUS_B
18 TXB_L
8 BUS_B_L
17 TX_B
9 GND_B
16 TXINH_B
10 RXB
15 GND_B
11 RXENA_B
14 +5V_B
12 RXB_L
13 GND_B
TRANSFORMER COUPLED
NHI-1573
BUS
BUS_L
Zo
.75Zo
.75Zo
1:1.79 1:1.4
1:2.5
NHI-1573
DIRECT COUPLED
55
55
Zo
BUS_L
BUS
Figure II: BUS Connections
Transformer Requirements:
The NHI-1573 series requires a transformer with a turns ratio of
1:2.5 for Direct Coupling, and a turns ratio of 1:1.79 for
Transformer Coupling to the Mil-Std-1553 Bus. Technitrol part
number Q1553-45 or equivalent is recommended. The center tap
on the transceiver side of the isolation transformer must be
grounded.
NHI-1573 Series
Table II: Pin Functions
Table III: Flatpack Dimensions
DIM
TYP
(inches)
TOL
(+/- inches)
A
0.800 "
0.008 "
B
11 EQ SP @
0.050 = 0.550 "
C
0.590 "
0.006 "
D
0.090 "
0.008 "
E
0.060 "
0.010 "
F
0.500 "
MIN
G
0.015 "
0.002 "
H
0.010 "
0.002 "
B
D
C
E
G
H
24
12
13
1
TOP VIEW
Figure III: Flatpack Package Detail
A
F
NHI-1573 Series
Ordering Information:
NHI-1573 FP / 883
Reliability Grade
Fully Compliant with Mil-Std-883
M
883
=
= Screened to Mil-Std-883, -55 to +125 C
Blank = Industrial, -40 to +85 C
Package Style
FP
= Flatpack (Figure III)
Decoder Compatibility
73
=
RX & RX_L, Standby = Logic 0
74
=
RX & RX_L, Standby = Logic 1
** SMD Listing: DESC Drawing# 5962-92061
See QML-38534 for NHI's Manufacturer Qualification Under Mil-PRF-38534
93
=
RX & RX_L, Standby = Logic 0
94
=
RX & RX_L, Standby = Logic 1
Mil-Std-1553,
Mil-Std-1553,
MacAir,
MacAir,
TX_L
TX
Vout
(Line to Line)
RX_L
RX
Vin
(Line to Line)
Transmit Waveforms
Receive Waveforms
Transmitter Operation:
A high level input on TXINH will
inhibit the transmitter outputs. If the
TX & TX_L transmitter inputs are
both high or both low, the
transmitter is also inhibited. The
output drivers are short circuit
protected and the device will "fold
back" to decrease power dissipation
under this condition until the fault is
removed.
Receiver Operation:
A low level input on RXENA will
disable the receiver outputs RX &
RX_L regardless of bus activity. The
receiver output compatibility may be
specified as logic 0 or logic 1 when in
standby mode.
** See Ordering Information
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