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HS-245RH, HS-246RH, HS-248RH
TM
Data Sheet
August 2000
File Number
3034.3
HS-245RH HS-246RH HS-248RH
Radiation Hardened Triple Line Transmitter Radiation Hardened Triple Line Receiver Radiation Hardened Triple Party-Line Receiver
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Features
* Electrically Screened to SMD # 5962-96722 and 596296723 * QML Qualified per MIL-PRF-38535 Requirements * Radiation Hardened DI Processing - Total Dose. . . . . . . . . . . . . . . . . . . . . 200 krad(Si) (Max) - 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
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 100 twisted 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 timeshare 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
Ordering Information
ORDERING NUMBER INTERNAL MKT. NUMBER HS1-245RH-8 HS9-245RH-8 HS1-245RH-Q HS9-245RH-Q HS9-245RH/PROTO HS1-246RH-8 HS9-246RH-8 HS1-246RH-Q HS9-246RH-Q HS1-248RH-8 HS9-248RH-8 HS1-248RH-Q HS9-248RH-Q TEMP. RANGE (oC) -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125
The internal 100 cable termination consists of 50 from 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-
5962R9672201QCC 5962R9672201QXC 5962R9672201VCC 5962R9672201VXC HS9-245RH/PROTO 5962R9672301QCC 5962R9672301QXC 5962R9672301VCC 5962R9672301VXC 5962R9672302QCC 5962R9672302QXC 5962R9672302VCC 5962R9672302VXC
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright (c) Intersil Corporation 2000
HS-245RH, HS-246RH, HS-248RH Pinouts
HS9-245RH 14 PIN FLATPACK HS1-245RH 14 CERAMIC DIP MIL-STD-1835 CDIP2-T14 TOP VIEW HS9-246RH/248RH 14 PIN FLATPACK HS1-246RH/248RH 14 PIN CERAMIC DIP MIL-STD-1835 CDFP3-F14 TOP VIEW
(-) INPUT 1 (+) INPUT 2 (R1) OUTPUT 3 (-) INPUT 4 (+) INPUT 5 (R2) OUTPUT 6 GND 7 R3 R2 R1 14 VCC (R1 AND R2) 13 VCC (R3) 12 VEE (R1 AND R2) 11 VEE (R3) 10 OUTPUT (R3) 9 INPUT (+) 8 INPUT (-)
1 INPUT 1 OUTPUT 2 OUTPUT 2 INPUT 1 INPUT 1 OUTPUT
1 2 3 4 5 6 T2 T1 T3
14 VCC 13 INPUT 2 12 OUTPUT 2 11 OUTPUT 1 10 INPUT 1 9 8 INPUT 2 OUTPUT 2
SUBSTRATE 7 GND
Test Circuits and Applications
NOTES: Input: TTLH 10ns TTHL 10ns pw = 500ns f = 1MHz VOUT IOUT = 50
OPEN (3.2V)
1 IN 2 IN
0V OPEN (3.2V) 0V
VCC = +5V
1
D.U.T.
TPHL
1 OUT
TPLH
0.15V
(3mA) 0V
VOUT 1 50 1% TRANSMITTER OUT VOUT 50 1%
2
2
0.15V
(3mA)
2 OUT
0V
All timing measurements referenced to 50% V points FIGURE 1. CIRCUIT #1 TRANSMITTER PROPAGATION DELAY
150mV VCC = +5V (+) (+)IN (-) IN 0V 150mV (-) 50 50 D.U.T. 800 30pF 520 RECEIVER OUTPUT
NOTES: Input: TTLH 10ns TTHL 10ns pw = 500ns f = 1MHz
RECEIVER OUT TPLH TPHL
0V
VEE = - 5V 5V
0V
All timing measurements referenced to 50% V points FIGURE 2. CIRCUIT #2 RECEIVER PROPAGATION DELAY
2
HS-245RH, HS-246RH, HS-248RH Test Circuits and Applications
IN 1/3 HS-245RH
(Continued)
+5V (+) 50 50 (-) (NOTE) +5V -5V (+) 1/3 HS-248RH (-) "PARTY-LINE" RECEIVER OUTPUT +5V 1/3 HS-246RH RECEIVER OUT
ENABLE
NOTE: HS-245RH should be driven by open-collector gates. (Totem-pole output may cause slight reduction in "on" data current). For more detailed information, refer to Design Information section of this data sheet.
-5V
FIGURE 3. TYPICAL APPLICATION
Design Information
Voltage Mode Transmission
Data rates of up to 10 million bits per second can be obtained with standard TTL logic; however, the transmission distance must be very short. For example, a typical 50 foot low capacitance cable will have a capacitance of approximately 750pF which requires a current of greater than 50mA to drive 5V into this cable at 10MHz; therefore, voltage mode transmitters are undesirable for long transmission lines at high data rates due to the large current required to charge the transmission line capacitance. An emitter coupled logic gate is frequently used for a current mode transmitter. However, ECL gates are not compatible with TTL and DTL logic and they require considerable power. The Intersil HS-245RH is a TTL/DTL compatible current mode transmitter designed for high data rates on long transmission lines. Data rates of 15 megabits per second can be obtained with 50 feet of transmission line when using the companion HS-246RH receiver. Data rates of 2 megabits per second are easily obtained on transmission lines as long as 1,000 feet. The Intersil transmitter and receivers feature very low power, typically 25mW for the transmitter and 15mW for the receiver.
Current Mode Transmission
An alternate method of driving high data rates down long transmission lines is to use a current mode transmitter. Current mode logic changes the current in a low impedance transmission line and requires very little change in voltage. For example, a 2mA change in transmitter current will produce a 100mV change in receiver voltage independent of the series transmission line resistance. The rise time at the receiver for a typical 50 foot cable (750pF) is approximately 30ns for a 2mA pulse.
Intersil Transmitter/Receivers
The Intersil transmitter/receiver family consists of a triple line transmitter, two triple line receivers with internal terminations and a triple party-line receiver. The general characteristics of the transmitter and receivers are outlined in Table A.
3
HS-245RH, HS-246RH, HS-248RH
TABLE A. GENERAL TRANSMITTER/RECEIVER CHARACTERISTICS TRIPLE LINE TRANSMITTER PARAMETER Operating Temperature Range "ON" Output Current Power Supply Current Standby Current Propagation Delay HS-245RH -55 to 125 1.0 Min 7.0 Max 33 Max 14 Max UNITS
oC
COMMENTS
mA mA A ns
Over Full Temperature Range Per Transmitter Section Per Transmitter Section Over Full Temperature Range
TRIPLE LINE RECEIVER PARAMETER Operating Temperature Range Power Supply ICC (VCC = +5.0V) Propagation Delay RECEIVER TYPE HS-246RH/248RH HS-246RH/248RH LIMITS -55 to 125 2.6 UNITS
oC
COMMENTS
mA
Per Receiver Section
All Receivers
30 INPUT
ns
Over Full Temperature Range OUTPUT
Input Impedance and Output Circuit
HS-246RH HS-248RH
100 Hi-Z
Open Collector 6K Pull-Up Resistor
Transmitter
The HS-245RH transmitters have two inputs per transmitter, either of which is low while the other is open during normal operation and both inputs are open during standby. For optimum transmitter performance, the "off" input should be open circuit rather than being pulled towards +5V, because this will reduce the "on" output data current. On the other hand, the "on" and "off" output data current will increase if the "off" input is held below its open circuit voltage. Open collector gates such as the 7401 and 7403 or 7405 HexInverter are suitable for driving the HS-245RH transmitter inputs. By using 2-input gates as shown in Figure 4, an enable line can be provided so that more than one transmitter may be connected to a line for time sharing. When the enable line is low the transmitter will be disabled and will present a high impedance to the transmission line as well as requiring very little power supply current. Complementary input signals may be derived from high speed inverter gates as shown, or by using the complementary outputs of a flip-flop. When the transmitter is connected near the midpoint of a long transmission line or to a line with terminations at both ends, two transmitter sections should be paralleled with respective inputs and outputs connected together in order to drive the reduced impedance. This parallel transmitter technique can also be used to increase the data rate on long transmission lines.
IN
G1
G2
G3
ENABLE
1/3 HS-245RH
1/3 HS-246RH
OUT
+5
GND
GND +5V -5V 2K-6K FOR TTL DRIVE REQUIRED FOR HS-246RH 1/3 HS-248RH
OUT
GND +5V -5V
FIGURE 4. TYPICAL DATA TRANSMISSION SYSTEM
4
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. 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 5 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).
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 3 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 50 resistors connecting each line to the ground return shield.
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 4. 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
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 5. 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 TRANSMITTER TTLH1 150mV LINE VOLTAGE AT RECEIVER TTLH2 TTHL2 TTHL1
0V TTLH2 TTHL1
0V TTLH2 TTHL2 MINIMUM PULSE WIDTH
WIDE PULSE
TRLH2 = TTLH1 KL2 TTHL2 = TTHL1 KL2
Where: L is Line Length K is determined by line loss characteristics
FIGURE 5. TRANSMISSION LINE WAVE-SHAPING
5
HS-245RH, HS-246RH, HS-248RH
the grounded input of the transmitter, and is less than 25V negative with respect to the transmitter VCC. The current mode system is totally unaffected by ground differential noise of +2V at frequencies as high as 1MHz. but in general, delays of between 1.5ns and 3.0ns per foot can be expected.
TABLE B. OVERALL TRANSMITTER/RECEIVER SWITCHING CHARACTERISTICS -55oC TO 125oC HS-245RH, HS-246RH HS-248RH CHARACTERISTICS Propagation Delay TPLH Propagation Delay TPHL Duty Cycle Distortion TPLH - TPHL NOTE: MIN TYP 18 18 2 MAX 40 40 15 UNITS ns ns ns
Propagation Delay
The worst case propagation delay of a transmitter and receiver, connected as shown in Figure 4, can be determined by adding the maximum delay shown on the data sheet for the transmitter and receiver. These overall switching characteristics are shown in Table B. For the entire system, however, the propagation delay of the transmission line must also be considered. This delay, of course, depends on the length of the line and the characteristics of the line,
VCC = +5V, VEE = -5V.
Schematics
14VCC
2.7K
380
2.7K
300 2.0K 1 2 3 4 IN OUT T1 2.0K 5 6 8 9 10 11 12 13
1 1
IN OUT
2 2
1 1
IN OUT T2
2 2
IN OUT
1 1
IN OUT T3
2 2
IN OUT
FIGURE 6. HS-245RH
14VCC 13VCC
6K 4.1K
(R1) OUTPUT 3
6 (R2) OUTPUT
10 (R3) OUTPUT
(R1) +INPUT 2 50 GND 7 2.7K
-INPUT 1 (R1) 50
+INPUT 5 (R2)
-INPUT 4 (R2)
+INPUT 9 (R3)
-INPUT 8 (R3)
12VEE R1 R2
11VEE R3
FIGURE 7. HS-246RH, HS-248RH NOTES: 1. HS-246RH does not have 6K output pull-up resistors. 2. HS-248RH does not have 50 input termination resistors.
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HS-245RH Die Characteristics
DIE DIMENSIONS: 45 mils x 45 mils x 11 mils 1140m x 1140m x 280m INTERFACE MATERIALS: Glassivation: Type: Silox Thickness: 8kA 1kA Top Metallization: Type: Aluminum Thickness: 12.5kA 2kA Substrate: HFSB Bipolar/Dielectric Isolation Backside Finish: Silicon ASSEMBLY RELATED INFORMATION: Substrate Potential: Unbiased ADDITIONAL INFORMATION: Worst Case Current Density: 7.8 x 104 A/cm2 Transistor Count: 6
Metallization Mask Layout
HS-245RH
OUTPUT f1
INPUT f1
OUTPUT f2
INPUT f2
VCC
OUTPUT f2
INPUT f2
OUTPUT f1
INPUT f1
INPUT f1
SUBSTRATE GND
OUTPUT f1
7
OUTPUT f2
INPUT f2
HS-246RH, HS-248RH Die Characteristics
DIE DIMENSIONS: 45 mils x 47 mils x 11 mils 1140m x 1190m x 280m INTERFACE MATERIALS: Glassivation: Type: Silox Thickness: 8kA 1kA Top Metallization: Type: T.W. Thickness: 2.5kA 0.5kA Type: Al Thickness: 14kA 2kA Substrate: ALPS Bipolar/Dielectric Isolation Backside Finish: Silicon ASSEMBLY RELATED INFORMATION: Substrate Potential: Unbiased ADDITIONAL INFORMATION: Worst Case Current Density: 1.4 x 105 A/cm2 Transistor Count: 9
Metallization Mask Layout
HS-246RH
VCC R1 AND R2
HS-248RH
VCC R1 AND R2
(+) INPUT
(+) INPUT
(-) INPUT
(-) INPUT
VCC R3
OUTPUT R1 (-) INPUT
3
VEE R1 AND R2
OUTPUT R1 (-) INPUT
VCC R3 VEE R1 AND R2 VEE R3 OUTPUT R3 (+) INPUT
VEE R3
(+) INPUT OUTPUT R3
(+) INPUT
OUTPUT R2
(-) INPUT
(+) INPUT
GND
OUTPUT R2
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site www.intersil.com 8
(-) INPUT
GND

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