Renesas 74CBTLV3244PGG

Overview

74CBTLV3244PGG from Renesas Electronics is a low-voltage octal bus switch with two independent 4-bit bidirectional switch banks, 5Ω on-resistance at 3.3V, 2.3V–3.6V supply range, and industrial temperature operation (−40°C to +85°C), used for high-speed 3.3V bus isolation and asynchronous data bus communication.

For engineers reviewing the 74CBTLV3244PGG datasheet, 74CBTLV3244PGG pinout, 74CBTLV3244PGG application, or 74CBTLV3244PGG equivalent, key selection factors include its dual OE-controlled 4-bit switching architecture, power-off isolation, over-voltage tolerance up to 4.6V, and TSSOP-20 package compatibility with standard '244 logic footprints.

Technical Context

The 74CBTLV3244PGG implements two independent 4-bit bi-directional analog switches, each controlled by a dedicated active-low Output Enable (1OE/2OE). Switch conduction is symmetric between Port A and Port B, supporting true bidirectional signal flow without direction control pins.

It features power-off isolation (IOFF ≤ 50 µA when VCC = 0), over-voltage tolerance (VI/O up to 4.6V regardless of VCC), and latch-up immunity exceeding 100 mA per JEDEC JESD78. The device operates with no internal level-shifting-signal voltage swing is constrained only by VCC and absolute maximum ratings.

Key Specifications

Pinout & Package

TSSOP-20 package (PGG20 code), 0.65mm pitch, 6.5mm × 4.4mm body, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus switch applications.

Compared with SN74CBTLV3244PWR, the 74CBTLV3244PGG offers identical switching performance and footprint but differs in manufacturer qualification and traceability. Against 74LVC244APW,118, the 74CBTLV3244PGG provides true bidirectionality, lower on-resistance, and essential isolation under power loss-critical for fault-tolerant industrial designs.

Availability

74CBTLV3244PGG is available at Aetrix Electronics and suitable for industrial I/O expansion, FPGA configuration bus switching, and 3.3V high-speed bus isolation requiring stable component supply across extended temperature ranges.

Supply support for 74CBTLV3244PGG 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The 74CBTLV3244PGG belongs to Renesas' CBTLV (Configurable Bus Transceiver, Low-Voltage) family, engineered specifically for low-latency, bidirectional signal routing in high-speed digital systems operating at 2.5V/3.3V rails.

FAQ

What is the maximum allowable input voltage on A/B pins of the 74CBTLV3244PGG when VCC = 0V?

The 74CBTLV3244PGG supports an absolute maximum input voltage of −0.5V to +4.6V on all A/B I/O pins, regardless of VCC state. When VCC = 0V, this over-voltage tolerance enables safe connection to live 3.3V or 5V buses without damage or leakage path activation-critical for hot-swap and partial-power-down scenarios. This specification is verified per Absolute Maximum Ratings table in the official Renesas datasheet DSC-5393/7.

Does the 74CBTLV3244PGG require external pull-up resistors on OE pins, and why?

Yes, the 74CBTLV3244PGG requires external pull-up resistors on both 1OE and 2OE pins to ensure a defined high state during power-up or power-down sequences. Because OE is active-low and the device has no internal pull-ups, an undefined OE state could cause unintended switch conduction or bus contention. Pulling OE to VCC guarantees high-impedance isolation until firmware or hardware explicitly asserts OE low. This design practice is explicitly recommended in the Functional Description section of the datasheet.

Can the 74CBTLV3244PGG be used to interface 3.3V and 5V logic domains?

Yes, the 74CBTLV3244PGG can safely interface 3.3V and 5V logic domains due to its over-voltage tolerant I/O structure: A/B pins accept −0.5V to +4.6V regardless of VCC (2.3V–3.6V). While it cannot drive 5V-high levels directly, it passes 5V signals bidirectionally when VCC ≥ 2.3V, provided the driven load does not exceed 128mA per channel and the 5V source is current-limited. This capability is confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics sections of the Renesas datasheet.

What is the typical on-resistance (RON) of the 74CBTLV3244PGG at 2.5V supply, and how does it affect signal integrity?

At VCC = 2.5V, the 74CBTLV3244PGG exhibits a typical on-resistance of 5Ω (measured at VI = 0V, IO = 64mA). This low RON minimizes voltage drop and RC delay in high-speed data paths-enabling propagation delays under 0.15ns with 30pF load. Combined with CIO(OFF) ≤ 6pF, it preserves edge rate and reduces jitter in 3.3V parallel buses running above 100 MHz. These values are specified in the DC Electrical Characteristics table of the official datasheet.

Is the 74CBTLV3244PGG pin-compatible with standard 74-series '244 devices, and what does that mean for PCB layout?

Yes, the 74CBTLV3244PGG is pin-out compatible with standard '244 logic devices such as 74LVC244 and 74ALVC244, sharing identical TSSOP-20 pin assignments for OE, A/B I/Os, VCC, and GND. This allows direct PCB footprint reuse without layout modification-reducing redesign effort and qualification time. However, unlike traditional '244 buffers, the 74CBTLV3244PGG is a passive analog switch, not a logic buffer, so timing, loading, and drive strength behavior differ fundamentally.