Triple Line Receiver

Typical Diagram

enlarge +typical diagram

Key Features

    • Electrically Screened to SMD # 5962-96722 and 5962-96723
    • 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


HS-246RH Radiation Hardened Triple 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: The internal 100Ω cable termination consists of 50Ω from each input to ground.

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

Design Tip

Are the Schottky clamp diodes required on the outputs when not driving MOSFETs?

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