AD7306JRZ-REEL

Overview

The AD7306JRZ-REEL is a monolithic RS-232/RS-422 transceiver operating from a single +5 V supply. It integrates two RS-232 drivers, one RS-422 driver, one RS-232 receiver, and one configurable receiver path. The internal charge pump generates ±10 V levels using four 0.1 μF capacitors. RS-232 channels support data rates up to 100 kHz, while RS-422 channels support high-speed communications up to 5 MHz. The device operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates RS-232 and RS-422 interfaces on a single chip with TTL/CMOS compatibility
• Internal charge pump voltage converter enables operation from a single +5 V power supply
• Configurable receiver path selectable between RS-232 and RS-422 modes via the SEL pin
• High-speed RS-422 operation with low timing skew between complementary outputs

Applications

• DTE-DCE Interface
• Packet Switching
• Local Area Networks
• Data Concentration
• Integrated Services Digital Network (ISDN)

Procurement Notes

Verify that the ordering suffix REEL indicates reel packaging rather than tube packaging when reviewing distributor listings. Confirm the specific package variant matches the required footprint, as the AD7306 series includes both SOIC and DIP options. Ensure the temperature grade corresponds to the application environment, noting that the JRZ suffix denotes the commercial range (0°C to +70°C) while ANZ/AR denote the industrial range (-40°C to +85°C). Cross-reference the RoHS compliance status indicated by the Z suffix if environmental regulations apply.

Selection Notes

Select this component when a system requires simultaneous support for both RS-232 and RS-422 standards without consuming multiple IC footprints. The internal charge pump eliminates the need for external bipolar power supplies, simplifying board layout. Consider the configurable receiver input for flexible interface design. Verify that the load capacitance requirements align with the specified slew rate limits to ensure signal integrity at the desired transmission speed.

Part Context

The AD7306 belongs to Analog Devices' family of dual-standard interface transceivers designed for mixed protocol environments. It bridges the gap between legacy RS-232 systems and higher-performance RS-422 networks. The JRZ-REEL variant specifically refers to the commercial temperature grade device housed in a 24-lead Standard Small Outline Package (SOIC), supplied in reel format for automated assembly processes.

Replacement Considerations

Public confirmed substitutes include other Analog Devices dual-interface transceivers such as the ADM3202 or ADM3222 families, though these may differ in channel count or power specifications. Direct pin-for-pin replacements within the same package type should be verified against the updated datasheet to ensure electrical parameter compatibility, particularly regarding the charge pump capacitor requirements and output drive capabilities.

FAQ

How is the receiver configured for RS-232 or RS-422 operation?

The receiver R1 input is configured using the 232/422 SEL pin. A Logic 1 selects RS-232 operation, accepting single-ended signals, while a Logic 0 selects RS-422 operation, accepting differential signals.

What are the capacitor requirements for the internal charge pump?

The charge pump requires four 0.1 μF capacitors connected between specific pins (C1+, C1-, C2+, C2-) and ground or each other. Both polarized and non-polarized capacitors are permitted, provided correct polarity is observed for polarized types.

Does the device support short circuit protection on its outputs?

Yes, all driver outputs feature internal short circuit protection. The RS-232 drivers limit short circuit current to less than 12 mA, and the RS-422 driver limits it to less than 150 mA.