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What is HS-246RH?

This electronic component, produced by the manufacturer "Intersil Corporation", performs the same function as "Radiation Hardened Triple Line(party-Line) Transmitter".


HS-246RH Datasheet PDF - Intersil Corporation

Part Number HS-246RH
Description Radiation Hardened Triple Line(party-Line) Transmitter
Manufacturers Intersil Corporation 
Logo Intersil Corporation Logo 


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Data Sheet
HS-245RH, HS-246RH, HS-248RH
August 1999 File Number 3034.2
HS-245RH
HS-246RH
HS-248RH
Radiation Hardened Triple
Line Transmitter
Radiation Hardened Triple
Line Receiver
Radiation Hardened Triple
Party-Line Receiver
The HS-245RH/246RH/248RH radiation hardened triple line
transmitter and triple line receivers are fabricated using the
Intersil dielectric isolation process. These parts are identical in
pinout and function to the original HD-245/246/248. They are
also die size and bond pad placement compatible with the
original parts for those customers who buy dice for hybrid
assembly.
Each transmitter-receiver combination provides a digital
interface between systems linked by 100twisted pair,
shielded cable. Each device contains three circuits
fabricated within a single monolithic chip. Data rates greater
than 15MHz are possible depending on transmission line
loss characteristics and length.
The transmitter employs constant current switching which
provides high noise immunity along with high speeds, low
power dissipation, low EMI generation and the ability to
drive high capacitance loads. In addition, the transmitters
can be turned “off” allowing several transmitters to time-
share a single line.
Receiver input/output differences are shown in the table:
PART NO.
HS-246RH
HS-248RH
INPUT
100
Hi-Z
OUTPUT
Open Collector
6K Pull-Up Resistors
The internal 100cable termination consists of 50from
each input to ground.
HS-248RH ‘‘party line’’ receivers have a Hi-Z input such that
as many as ten of these receivers can be used on a single
transmission line.
Each transmitter input and receiver output can be connected to
TTL and DTL systems. When used with shielded transmission
line, the transmitter-receiver system has very high immunity to
capacitance and magnetic noise coupling from adjacent
conductors. The system can tolerate ground differentials of
-2.0V to +20.0V (transmitter with respect to receiver).
Specifications for Rad Hard QML devices are controlled
by the Defense Supply Center in Columbus (DSCC). The
SMD numbers listed here must be used when ordering.
Detailed Electrical Specifications for these devices are
contained in SMD 5962-96722 and 5962-96723. A “hot-
link” is provided on our homepage for downloading.
http://www.intersil.com/spacedefense/space.htm
Features
• Electrically Screened to SMD # 5962-96722 and 5962-
96723
• QML Qualified per MIL-PRF-38535 Requirements
• Radiation Hardened DI Processing
- Total Dose (γ) . . . . . . . . . . . . . . . . . . . 2 x 105 RADs(Si)
- Latchup Free
- Neutron Fluence . . . . . . . . . . . . . . . . . 5 x 1012 N/cm2
• Replaces HD-245/246/248
• Current Mode Operation
• High Speed with 50 Foot Cable . . . . . . . . . . . . . . . 15MHz
High Speed with 1000 Foot Cable . . . . . . . . . . . . . . 2MHz
• High Noise Immunity
• Low EMI Generation
• Low Power Dissipation
• High Common Mode Rejection
• Transmitter and Receiver Party Line Capability
• Tolerates -2.0V to +20.0V Ground Differential (Transmitter
with Respect to Receiver)
• Transmitter Input/Receiver Output TTL/DTL Compatible
Ordering Information
ORDERING NUMBER
INTERNAL
MKT. NUMBER
TEMP. RANGE
(oC)
5962R9672201QCC HS1-245RH-8
-55 to 125
5962R9672201QXC HS9-245RH-8
-55 to 125
5962R9672201VCC HS1-245RH-Q
-55 to 125
5962R9672201VXC
HS9-245RH-Q
-55 to 125
HS9-245RH/PROTO HS9-245RH/PROTO
-55 to 125
5962R9672301QCC HS1-246RH-8
-55 to 125
5962R9672301QXC HS9-246RH-8
-55 to 125
5962R9672301VCC HS1-246RH-Q
-55 to 125
5962R9672301VXC
HS9-246RH-Q
-55 to 125
5962R9672302QCC HS1-248RH-8
-55 to 125
5962R9672302QXC HS9-248RH-8
-55 to 125
5962R9672302VCC HS1-248RH-Q
-55 to 125
5962R9672302VXC
HS9-248RH-Q
-55 to 125
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
www.intersil.com or 321-724-7143 | Copyright © Intersil Corporation 1999

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HS-246RH equivalent
HS-245RH, HS-246RH, HS-248RH
Transmitter Operation
The transmitter alternately applies the current to each of the
two conductors in the twisted pair line such that the total
current in the twisted pair is constant and always in the same
direction. This current flows through either of the two 50V
terminating resistors at the receiver and returns to the
transmitter as a steady DC current on the transmission line
shield. The DC power supply return for the transmitter is
through the receiver terminating resistors (the transmitter
ground pin is only a substrate ground). Therefore, it is
essential that the shield be connected to the power supply
common at both the transmitter and receiver, preferably at
the integrated circuit “ground” pin. More than fifteen twisted
pair lines can share the same shield without crosstalk.
Receivers
The HS-248RH “party-line” receiver presents a high
impedance load to the transmission line allowing as many as
ten HS-248RH receivers to be distributed along a line without
excessive loading. Figure 6 shows a typical system of a
transmitter, a terminating receiver and a party-line receiver.
The transmission line is terminated in its characteristics
impedance by an HS-246RH or by a pair of 50resistors
connecting each line to the ground return shield.
Transmission Lines
The maximum frequency (or minimum pulse width) which
can be carried by a certain length of a given transmission
line is dependent on the loss characteristics of the particular
line. At low frequencies, there will be virtually no loss in
pulse amplitude, but there will be a degradation of rise and
fall-time which is roughly proportional to the square of the
line length. This is shown in Figure 7. If the pulse width is
less than the rise-time at the receiver end, the pulse
amplitude will be diminished, approaching the point where it
cannot be detected by the receiver.
150mV
LINE
VOLTAGE
AT TRANS-
MITTER
150mV
TTLH1
0V
TTHL1
TTLH2
TTHL1
LINE
VOLTAGE
AT
RECEIVER
TTLH2
0V
TTHL2
TTLH2 TTHL2
WIDE PULSE
TRLH2 = TTLH1 KL2
TTHL2 = TTHL1 KL2
MINIMUM PULSE WIDTH
Where: L is Line Length K is
determined by line loss
characteristics
FIGURE 5. TRANSMISSION LINE WAVE-SHAPING
The transmission line used with the Intersil HS-245RH
series transmitter and receivers can be any ordinary
shielded, twisted pair line with a characteristic impedance of
100. Twisted pair lines consisting of number 20 or 22
gauge wire will generally have this characteristic impedance.
Special high quality transmission lines are not necessary
and standard audio, shielded-twisted pair, cable is generally
suitable.
Since the necessary characteristics for various twisted pair
lines are not readily available, it may be necessary to take
some measurements on a length of the proposed line. To do
this, connect an HS-245RH transmitter to one end of the line
(100 feet or more) and an HS-246RH to the other end. The
rise and fall-times can be measured on the line at both ends
and the constant ‘‘K’’, for that line can be computed as
shown in Figure 7 so that the minimum pulse width can be
determined for any length of line.
Data rates of 2MHz have been obtained using 1,000 feet of
standard shielded, twisted pair, audio cable. Data rates of
15MHz are possible on shorter lengths of transmission line
(50 feet).
Electromagnetic Interference
Very little electromagnetic interference is generated by the
Intersil current mode system because the total current
through the twisted pair is constant, while the current
through the shield is also constant and in the opposite
direction. This can be verified by observing, with a current
probe, the total current through the twisted pair, through the
shield and through the complete shielded, twisted pair cable.
In each case a constant current will be observed with only
small variations. Small pulses may be observed if the
complementary inputs to the transmitter do not switch at the
same time. The current will decrease during the time both
inputs are high, and will increase during the time both inputs
are low. These switching pulses may be observed when
using the circuit shown in Figure 6. The amplitude and shape
of these pulses will depend of the propagation delay of G1,
and transition times G2 and G3. These pulses are generally
of no concern because of their small amplitude and width,
but they may be reduced by increasing the similarity of the
waveforms and timing synchronization of the complementary
signals applied to the transmitter.
In addition to generating very little noise, the system is also
highly immune to outside noise since it is difficult to
capacitively couple a differential signal into the low
impedance twisted pair cable and it is even more difficult in
induce a differential current into the line due to the very high
impedance of the constant current transmitter. Therefore,
differential mode interference is generally not a problem with
the Intersil current mode system. Large common mode
voltages can also be tolerated because the output current of
the transmitter is constant as long as the receiver
termination ground is less than 2V positive with respect to
5


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Part NumberDescriptionMFRS
HS-246RHThe function is Radiation Hardened Triple Line(party-Line) Transmitter. Intersil CorporationIntersil Corporation

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