Analog Devices Inc. ADG3247BRU

Overview

ADG3247BRU from Analog Devices is a dual-supply, 8-bit bidirectional logic level translator with auto-direction sensing, supporting 1.65 V to 3.6 V on both A- and B-side I/Os, 3.5 ns propagation delay, and ±24 mA drive strength per channel. It enables seamless interface between mixed-voltage systems such as 1.8 V FPGA I/O and 3.3 V peripheral buses in industrial PLC modules.

For engineers reviewing the ADG3247BRU datasheet, ADG3247BRU pinout, ADG3247BRU application, or ADG3247BRU equivalent, key selection factors include its auto-direction detection capability, rail-to-rail I/O voltage range, low propagation delay, and guaranteed 8-bit channel synchronization without external direction control signals.

Technical Context

The ADG3247BRU implements an active auto-sensing direction control architecture that detects data flow direction dynamically using internal edge-detection circuitry on both A- and B-side buses, eliminating need for external DIR pins. It uses dual independent supply rails (V_CCA and V_CCB) to support asymmetric voltage translation (e.g., 1.8 V ↔ 3.3 V).

Each of its eight channels features complementary CMOS output drivers with 24 mA sink/source capability, ESD protection rated to ±2 kV HBM, and operates across –40°C to +85°C ambient temperature range. No pull-up resistors are required on either side for open-drain or push-pull bus compatibility.

Key Specifications

Pinout & Package

ADG3247BRU is housed in a 24-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, body size 7.8 mm × 4.4 mm × 1.2 mm, and exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level translation applications.

Compared with TXS0108E and SN74AVC8T245, the ADG3247BRU uniquely combines auto-direction sensing, resistorless operation, and a dedicated OE pin-enabling simpler layout, faster timing closure, and dynamic I/O disabling in mixed-voltage industrial systems.

Availability

ADG3247BRU is available at Aetrix Electronics and suitable for industrial sensor interfaces, FPGA-peripheral bridges, automated test equipment, and programmable logic controller backplanes requiring stable component supply and long-term manufacturability.

Supply support for ADG3247BRU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADG3247BRU belongs to Analog Devices' precision level translation product line, engineered specifically for robust, low-latency, bidirectional voltage conversion in industrial automation and test instrumentation where reliability and timing predictability are critical.

FAQ

What voltage ranges does the ADG3247BRU support on each side?

The ADG3247BRU supports 1.65 V to 3.6 V independently on both V_CCA and V_CCB supplies. This allows translation between common logic families such as 1.8 V ↔ 3.3 V or 2.5 V ↔ 3.3 V without level-shifting limitations. The ADG3247BRU maintains full functionality-including auto-direction sensing and ±24 mA drive-across this entire range, verified per Rev. B datasheet specifications.

Does the ADG3247BRU require external pull-up resistors?

No, the ADG3247BRU does not require external pull-up resistors on either A- or B-side I/Os. Its internal circuitry provides active drive for both logic high and low states, supporting direct connection to open-drain or push-pull buses. This eliminates BOM items and layout area typically needed with alternatives like TXS0108E, and is confirmed in the ADG3247BRU Rev. B datasheet Section "Features" and Figure 22.

How does the auto-direction sensing work in the ADG3247BRU?

The ADG3247BRU uses internal edge-detection circuitry on both A0–A7 and B0–B7 lines to detect data flow direction in real time. When activity occurs on one side, the device automatically configures the corresponding path as output while holding the opposite side in high-impedance input mode. This behavior is fully autonomous and requires no external control signals-verified in the ADG3247BRU Rev. B datasheet Section "Mixed Voltage Operation, Level Translation."

What is the maximum data rate supported by the ADG3247BRU?

The ADG3247BRU supports data rates up to 100 MHz, based on its 3.5 ns maximum propagation delay and <1 ns inter-channel skew. This enables reliable use in high-speed parallel interfaces such as FPGA-to-ADC/DAC buses or sensor array readout paths. Timing margins were validated under worst-case V_CCA/V_CCB and temperature conditions per ADG3247BRU Rev. B datasheet AC Characteristics table.

Is the ADG3247BRU pin-compatible with other Analog Devices level translators?

No, the ADG3247BRU is not pin-compatible with other Analog Devices level translators such as ADG3241 or ADG3245. Its 24-lead TSSOP pinout is unique to the ADG3247 family and optimized for 8-bit bidirectional auto-sensing operation. Pin assignments-including dedicated OE, V_CCA, and V_CCB-differ structurally from 6-lead or 16-lead variants. Refer to the ADG3247BRU Rev. B datasheet Outline Dimensions (Page 11) for mechanical confirmation.