Isolation
Transformer
Direct
or
Transformer
Coupler Box
Data Bus
1553
TXOUT
TXOUT_L
RXIN
RXIN_L
RX
Input
Filter
Comparator
RX
Receive
Logic
RECEIVER
RXENA
RX_L
RX
TXINH
TX_L
TX
+5V
TRANSMITTER
TX
Transmit
Logic
Shaping
Network
Figure I: NHI-1579 Block Diagram
(Each Channel)
Features:
Description:
Compliant to Mil-Std-1553A & B, Mil-Std-1760
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 Tolerance, Reliability, Noise Performance
and Thermal Impedance !!
Total Dose Radiation Tolerance 1 Meg Rad (Si) !!
Direct Replacements for the Popular NHI-1559
Series!!
The NHI-1579 series of Mil-Std-1553/1760 monolithic
dual transceivers are available in 1.850" x .600", 36
pin plug-in and flatpack ceramic packages. It
operates off of a single +5V power supply with very
low standby power dissipation.
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.
NATIONAL HYBRID, INC.
2200 Smithtown Avenue, Ronkonkoma, NY 11779
(516) 981-2400 FAX 516-981-8888
Mil-Std-1553/1760 Products
NHI-1579 Ceramic Package Series
+5V Monolithic Dual Transceivers
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
Junction
Tj
-55
165
C
TEMPERATURES
Tc
-55
125
C
Storage
Ts
-55
165
C
THERMAL IMPEDANCE
Junction to Case
qjc
4
C/W
LOGIC I/O
RXENA_A, TXA, TXA_L,
Vcc= 5.5V, Vil= 0.0V
Iil
-0.4
mA
TXINH_A, RXENA_B, TXB,
TXB_L, TXINH_B
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
Input Resistance
Differential
Rin
20
k W
Input Capacitance
Differential
Cin
5
pF
Common Mode Rejection Ratio
CMRR
40
dB
Input Level
Differential
Vin
40
Vpp
Receiver Delay
Zero crossing on bus to RX or RX_L
t
RD
250
350
nS
TRANSMITTER
Output Voltage
Across 140 W 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
Transmitter Delay
TX or TX_L edge to bus zero
crossing
t
TD
125
150
nS
Output Dynamic Offset Voltage
Across 35 W load
Vdyn
-90
90
mV
Output Noise
Differential
Vnpp
10
mVpp
Output Resistance
Differential, not transmitting
Rout
10
k
NHI-1579 Series
TABLE I: Electrical Specifications
36 Pin Ceramic Plug-In Package Detail
A
B
D
C
E
G
F
36
19
18
1
TOP VIEW
H
DIM
TYP
TOL
(inches)
(+/- inches)
A
B
C
D
E
F
G
1.850 SQ
0.015
17 EQ SP @ 0.100 = 1.700
0.600
0.010
0.140
MAX
0.050
0.002
0.050
0.010
0.150
MIN
H
0.018
0.002
36 Pin Ceramic Flatpack Package Detail
DIM
TYP
TOL
(inches)
(+/- inches)
A
B
C
D
E
F
G
1.850 SQ
0.015
17 EQ SP @ 0.100 = 1.700
0.600
0.010
0.120
0.012
0.080
0.010
0.500
MIN
0.018
0.002
H
0.010
0.002
A
B
D
C
E
G
F
36
19
18
1
H
TOP VIEW
TRANSFORMER COUPLED
NHI-1579
TXOUT
TXOUT_L
RXIN
RXIN_L
1:2.5
NHI-1579
TXOUT
TXOUT_L
RXIN
RXIN_L
DIRECT COUPLED
55
55
Zo
Zo
.75Zo
.75Zo
1:1.79 1:1.4
Figure II: BUS Connections
Transformer Requirements:
The NHI-1579 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-1579 Series
Table II: Pin Functions
Pin#
Function
Pin#
Function
1 TXOUT_A
36 TXA_L
2 TXOUT_A_L
35 TXA
3 GND_A
34 TXINH_A
4 NC
33 +5V_A
5 RXA
32 NC
6 RXENA_A
31 GND_A
7 GND_A
30 RXIN_A_L
8 RXA_L
29 RXIN_A
9 NC
28 NC
10 TXOUT_B
27 TXB_L
11 TXOUT_B_L
26 TXB
12 GND_B
25 TXINH_B
13 NC
24 +5V_B
14 RXB
23 NC
15 RXENA_B
22 GND_B
16 GND_B
21 RXIN_B_L
17 RXB_L
20 RXIN_B
18 NC
19 NC
Ordering Information:
NHI-1579 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
Blank = Plug-In
Transceiver Type and Decoder Compatibility
78
= MacAir,
79
= Mil-Std-1553,
** SMD Listing: DESC Drawing# 5962-92061
See QML-38534 for NHI's Manufacturer Qualification Under Mil-PRF-38534
80
= Mil-Std-1553,
81
= MacAir,
RX & RX_L, Standby = Logic 0
RX & RX_L, Standby = Logic 0
RX & RX_L, Standby = Logic 1
RX & RX_L, Standby = Logic 1
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
NHI-1579 Series
TX_L
TX
Vout
(Line to Line)
RX_L
RX
Vin
(Line to Line)
Transmit Waveforms
Receive Waveforms
t
TD
t
RD
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