NATIONAL HYBRID, INC.
2200 Smithtown Avenue, Ronkonkoma, NY 11779
(516) 981-2400 FAX 516-981-8888
Mil-Std-1553 Products
Single Channel Hybrid Transceivers
Features/Applications:
Available for +15V, +12V, and +5V
Only Applications
Very Low Standby Power
Low Thermal Resistance
Very Low Dynamic Offset
Short Circuit Proof
Superior Noise Performance
Screened to Mil-PRF-38534
Description:
The NHI family of single transceivers are available in
1.275" x .780", 24 pin plug-in and flatpack packages.
The 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 a receiver enable strobe input to control the
outputs of the received data. Devices are available
with receiver outputs normally HIGH or LOW
during standby mode for compatibility with industry
standard decoders.
The transmitter 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 a transmitter inhibit input
TXINH to disable the transmitter.
+5V
TRANSMITTER
TX
TX
Transmit
TX_L
TXINH
Logic
+V
Data Bus
Isolation
Transformer
TXOUT
Coupler Box
Direct
Or
Transformer
Shaping
Network
TXOUT_L
RECEIVER
RX
RX
Receive
RX_L
Logic
RXENA
Comparator
Filter
RX
Input
RXIN_L
RXIN
Figure I: Block Diagram
Single Channel Transceivers
Transformer Requirements:
The NHI-15XX series of single channel
transceivers require a transformer in
order to couple to the Mil-Std-1553 Bus.
The turns ratios required for both Direct
and Transformer Coupling for each
device type, and the corresponding
Technitrol part numbers Q1553-X are
outlined in the table below.
The center tap on the transceiver side of
the isolation transformer must be
grounded.
TRANSFORMER COUPLED
NHI-15XX
TXOUT
Zo
See Table
1:1.4
.75Zo
.75Zo
TXOUT_L
RXIN
RXIN_L
DIRECT COUPLED
NHI-15XX
TXOUT
See Table
55
TXOUT_L
RXIN
RXIN_L
55
Zo
Figure II: BUS Connections
Device
Power
Supply +V
Transformer
Turns Ratio
Direct
1.40:1.00
1.40:1.00
1.40:1.00
1.25:1.00
1.00:2.12
1.00:2.12
1.25:1.00
Transformer
Turns Ratio
Stub
2.00:1.00
2.00:1.00
2.00:1.00
1.66:1.00
1.00:1.50
1.00:1.50
1.66:1.00
Technitrol
Part Number
DESC SMD
NHI-1508
NHI-1509
NHI-1510
NHI-1531
NHI-1534
NHI-1535
NHI-1545
+15V
+15V
+15V
+12V
+5V Only
+5V Only
+12V
Q1553-2
Q1553-2
Q1553-2
Q1553-3
Q1553-5
Q1553-5
Q1553-3
5962-9082906
5962-9082905
5962-8604906
Single Channel Transceivers
+5V Only Device Pin Functions
Pin#
1
2
3
4
5
6
7
8
9
10
11
12
Function
TXOUT
TXOUT_L
GND
NC
NC
NC
RX
RXENA
GND
RX_L
NC
NC
Pin#
24
23
22
21
20
19
18
17
16
15
14
13
Function
NC
TX_L
TX
TXINH
+5V
NC
GND
NC
RXIN_L
RXIN
NC
NC
+15V & +12V Device Pin Functions
Pin#
1
2
3
4
5
6
7
8
9
10
11
12
Function
TXOUT
TXOUT_L
GND
NC
NC
NC \1
RX
RXENA
GND
RX_L
NC
NC
Pin#
24
23
22
21
20
19
18
17
16
15
14
13
Function
NC
TX_L
TX
TXINH
+5V
NC
GND
NC
RXIN_L
RXIN
NC
+V
\1 Control voltage input TXVOC for
NHI-1508 variable transmitter
output transceiver.
A
B
H
24
24
TOP VIEW
19
TOP VIEW
D C
18
1
1
12
C
13
A
B
F
E
F
G
D
G
E
24 Pin Plug-In Package Detail
24 Pin Plug-In Dimensions
DIM
A
B
C
D
E
F
G
TYP
(inches)
1.270 "
11 EQ SP @
0.770 "
0.600 "
0.215 "
0.175 "
0.018 " DIA.
TOL
(+/- inches)
0.010 "
0.100 = 1.700 "
0.010 "
0.010 "
MAX
MIN
0.002 "
24 Pin Flatpack Package Detail
24 Pin Flatpack Dimensions
DIM
A
B
C
D
E
F
G
H
TYP
(inches)
1.275 "
11 EQ SP @
0.775 "
0.175 "
0.072 "
0.500 "
0.015 "
0.010 "
TOL
(+/- inches)
0.010 "
0.100 =1.100 "
0.010 "
MAX
0.010 "
MIN
0.003 "
0.002 "
Single Channel Transceivers
Ordering Information:
NHI-1508 FP / 883
Reliability Grade
883
= Fully Compliant with Mil-Std-883
= Military, -55 to +125 °C
M
Blank = Industrial, -40 to +85 °C
Package Style
Blank = Plug-In
FP
= Flatpack
Decoder Compatibility
08
= +15V, Variable Output, RX & RX_L, Standby = Logic 0
09
= +15V, RX & RX_L, Standby = Logic 0
10
= +15V, RX & RX_L, Standby = Logic 1
31
= +12V, RX & RX_L, Standby = Logic 0
34
= +5V, RX & RX_L, Standby = Logic 0
35
= +5V, RX & RX_L, Standby = Logic 1
45
= +12V, RX & RX_L, Standby = Logic 1
See QML-38534 for NHI's Manufacturer Qualification Under Mil-PRF-38534
V: October 2005
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