Renesas 74CBTLV16245PAG

Overview

74CBTLV16245PAG from Renesas Electronics is a low-voltage 16-bit bus switch IC organized as dual 8-bit bidirectional switches with independent active-low Output Enable (1OE, 2OE) control. It operates from 2.3V to 3.6V, delivers ≤5Ω on-resistance at 3.3V, supports isolation under power-off conditions, and is rated for industrial temperature range (–40°C to +85°C). It is used in 3.3V high-speed bus switching and isolation applications in embedded computing and communications backplanes.

For engineers reviewing the 74CBTLV16245PAG datasheet, 74CBTLV16245PAG pinout, 74CBTLV16245PAG application, or 74CBTLV16245PAG equivalent, key selection considerations include its bidirectional low-R_ON switching, over-voltage tolerance up to 4.6V, latch-up immunity (>100mA), ESD robustness (>2000V HBM), and TSSOP-48 package compatibility with standard 16245 pinouts.

Technical Context

The 74CBTLV16245PAG implements two independent 8-bit CMOS transmission-gate-based bus switches, each controlled by a dedicated active-low OE input. Its LVTTL-compatible control inputs accept VIH ≥ 2.0V (at VCC = 2.7–3.6V) and VIL ≤ 0.8V, enabling direct interfacing with 3.3V logic families without level translation.

Each switch exhibits propagation delay ≤0.25ns (A↔B), enable/disable times ≤5.5ns, and maintains high-impedance isolation when OE is high. The device guarantees over-voltage tolerance on I/O pins up to 4.6V regardless of VCC state, and supports hot-swap capability via power-off isolation and IOFF leakage <10µA at VCC = 0V.

Key Specifications

Pinout & Package

74CBTLV16245PAG is packaged in a 48-pin Thin Shrink Small Outline Package (TSSOP), designated PAG48, with 0.5mm pitch and exposed pad not present. Pin assignment follows standard 16245 layout with dual 8-bit A/B ports and independent OE controls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV16245PAG and 74LVC16245APAG, the 74CBTLV16245PAG uniquely combines 5Ω R_ON, 4.6V I/O tolerance, and <10µA IOFF - making it the only option among the three qualified for hot-pluggable, mixed-voltage, or high-reliability industrial backplane designs.

Availability

74CBTLV16245PAG is available at Aetrix Electronics and suitable for PCI Express interposers, DDR memory module isolation, backplane signal multiplexing, and FPGA I/O expansion requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74CBTLV16245PAG 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 connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The 74CBTLV16245PAG belongs to Renesas' legacy IDT logic portfolio, designed specifically for high-speed, low-latency, and robust 3.3V bus switching in industrial and communications equipment requiring hot-swap readiness and mixed-voltage interoperability.

FAQ

What is the maximum operating voltage on the I/O pins of the 74CBTLV16245PAG?

The 74CBTLV16245PAG supports an absolute maximum I/O voltage of –0.5V to 4.6V, independent of VCC level. This over-voltage tolerance allows safe interfacing with higher-voltage signals (e.g., 5V-tolerant peripherals) without external clamping diodes, and remains valid even when VCC = 0V - a key enabler for hot-swap and mixed-voltage system design. The 74CBTLV16245PAG maintains this rating across its full industrial temperature range.

Does the 74CBTLV16245PAG require external pull-up resistors on its OE pins?

Yes - to ensure a defined high-impedance state during power-up or power-down sequences, the OE pins of the 74CBTLV16245PAG must be tied to VCC via external pull-up resistors. This prevents unintended switch conduction before control logic stabilizes. The 74CBTLV16245PAG datasheet recommends using 10kΩ pull-ups; lower values improve noise immunity but increase static current, while higher values risk slow rise time in noisy environments.

Can the 74CBTLV16245PAG be used in hot-swap applications?

Yes - the 74CBTLV16245PAG is explicitly designed for hot-swap use. Its power-off isolation (IOFF <10µA at VCC = 0V), over-voltage tolerant I/O (–0.5V to 4.6V), and latch-up immunity (>100mA) allow safe insertion/removal while other system rails remain active. When VCC is absent, the 74CBTLV16245PAG presents high impedance between A and B ports, preventing back-driving or damage to powered circuitry - a core requirement validated in telecom and server backplane designs.

What is the typical on-resistance (R_ON) of the 74CBTLV16245PAG at 3.3V supply?

The typical on-resistance (R_ON) of the 74CBTLV16245PAG is 5Ω at VCC = 3.3V with IO = 24mA, and remains ≤8Ω across its full 2.3V–3.6V supply range. This low R_ON minimizes voltage drop and signal distortion in high-speed digital buses, supporting clean 3.3V logic transitions even at 100+ mA per switch. Measured R_ON is consistent across all 16 channels of the 74CBTLV16245PAG and specified with tight min/max bounds for production consistency.

Is the 74CBTLV16245PAG pin-compatible with standard 74-series 16245 devices?

Yes - the 74CBTLV16245PAG uses standard 16245 pinout configuration, matching industry-standard 48-pin TSSOP layouts for 16-bit transceivers and bus switches. It shares identical pin assignments for A/B ports, OE controls, VCC, and GND with legacy 74ACT16245 and 74LVC16245 variants, enabling drop-in replacement in existing footprints - provided system-level requirements (voltage, speed, isolation) align. The 74CBTLV16245PAG retains this mechanical and logical compatibility while delivering superior electrical performance.