Intersil Corporation HS-245RH, HS-246RH, HS-248RH Datasheet

HS-245RH, HS-246RH, HS-248RH

Data Sheet August 1999

HS-245RH Radiation Hardened Triple

Line Transmitter

HS-246RH Radiation Hardened Triple

Line Receiver

HS-248RH 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 100Ω 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. INPUT OUTPUT

HS-246RH 100Ω Open Collector HS-248RH Hi-Z 6K Pull-Up Resistors

The internal 100Ω cable termination consists of 50Ω from each input to ground.

HS-248RH ‘‘party line’’ receivershave a Hi-Z input such that as many as ten of these receivers can be used on a single transmission line.

Each transmitter inputandreceiv eroutputcan be connected to TTL and DTL systems. When used with shielded transmission line, the transmitter-receiver system has v ery 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 “hotlink” is provided on our homepage for downloading. http://www.intersil.com/spacedefense/space.htm

File Number 3034.2

Features

• Electrically Screened to SMD # 5962-96722 and 596296723

• QML Qualiﬁed per MIL-PRF-38535 Requirements

• Radiation Hardened DI Processing

- Total Dose (γ) . . . . . . . . . . . . . . . . . . . 2 x 10

- Latchup Free

- Neutron Fluence . . . . . . . . . . . . . . . . . 5 x 10

• 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

RADs(Si)

N/cm2

Ordering Information

INTERNAL

ORDERING NUMBER

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

MKT. NUMBER

TEMP. RANGE

(oC)

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Pinouts

HS-245RH, HS-246RH, HS-248RH

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

GND

φ1 INPUT φ1 OUTPUT φ2 OUTPUT

φ2 INPUT

φ1 INPUT φ1 OUTPUT

SUBSTRATE

Test Circuits and Applications

NOTES: Input: TTLH ≤ 10ns

TTHL ≤ 10ns pw = 500ns f = 1MHz

VOUT

IOUT =

50Ω

φ1 IN φ2 IN

TPHL

φ1 OUT

φ2 OUT

VCC

INPUT

OUTPUT

INPUT INPUT

OUTPUT

φ2

φ1 φ2

φ2 φ1

φ2

TPLH

OPEN (

≈3.2V)

0V OPEN

(

≈3.2V)

≈0.15V

≈3mA)

( 0V

≈0.15V

≈3mA)

(

(-) INPUT

(+) INPUT

(R1) OUTPUT

(-) INPUT

(+) INPUT

(R2) OUTPUT

GND

φ1

φ2

1 2 3 4 5 6

D.U.T.

VCC = +5V

VCC (R1 AND R2)

VCC (R3)

VEE (R1 AND R2)

VEE (R3)

OUTPUT (R3)

INPUT (+)

9 8

INPUT (-)

VOUT

50Ω 1%

TRANSMITTER

VOUT

50Ω 1%

φ1

OUT

φ2

NOTES: Input: TTLH ≤ 10ns

TTHL ≤ 10ns pw = 500ns f = 1MHz

RECEIVER

All timing measurements referenced to 50% V points

(+)IN (-) IN

OUT

All timing measurements referenced to 50% V points

FIGURE 1. CIRCUIT #1 TRANSMITTER PROPAGATION DELAY

150mV

0V 150mV

TPLH

TPHL

(+)

(-)

FIGURE 2. CIRCUIT #2 RECEIVER PROPAGATION DELAY

50Ω 50

Ω

VCC = +5V

D.U.T.

VEE = - 5V

520Ω

800Ω

30pF

RECEIVER OUTPUT

HS-245RH, HS-246RH, HS-248RH

Test Circuits and Applications (Continued)

+5V

1/3 HS-245RH

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.

(NOTE)

FIGURE 3. TYPICAL APPLICATION

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.

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.

+5V

1/3 HS-246RH

50Ω

Ω

-5V

“PARTY-LINE”

RECEIVER

-5V

RECEIVER OUT

OUTPUT

(-)

(+)

(-)

+5V

1/3 HS-248RH

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.

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.

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