Texas Instruments SN74CBTLV16212GR

Overview

SN74CBTLV16212GR from Texas Instruments is a 24-bit high-speed bus switch and exchanger IC with rail-to-rail switching, 4-Ω on-state resistance, break-before-make switching logic, and I_off support for partial-power-down mode. It operates from 2.3 V to 3.6 V and enables data exchange between four signal ports (A1/B1–A12/B12) via S0–S2 select lines in telecom backplanes and memory interconnects.

For engineers reviewing the SN74CBTLV16212GR datasheet, SN74CBTLV16212GR pinout, SN74CBTLV16212GR application, or SN74CBTLV16212GR equivalent, key selection criteria include its 56-pin TSSOP (DGG) package, sub-nanosecond propagation delay (0.15 ns typ), 128 mA continuous channel current rating, and JESD 78 Class II latch-up immunity - critical for hot-swap-capable server I/O subsystems.

Technical Context

The SN74CBTLV16212GR implements 12 independent bidirectional FET switches per A/B port pair, controlled by three select inputs (S0–S2) that configure 24-bit bus switching or 12-bit data exchange modes. Its CMOS-compatible control interface supports 2.3–3.6 V logic thresholds with ±1 µA input leakage and 5 pF input capacitance.

Each switch features rail-to-rail analog signal handling, 4 Ω typical on-resistance at V_CC = 3.3 V, and isolation during power-off via I_off (≤10 µA at V_CC = 0 V). The break-before-make architecture prevents through-current during port reconfiguration, ensuring safe operation in live-backplane environments.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package, 12.0 mm × 4.4 mm footprint, 1.2 mm max height, lead-free NiPdAu finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBTLV3861RGYR and PI3CH485QE, the SN74CBTLV16212GR uniquely combines 24-bit exchange capability, 4 Ω r_on, and validated I_off behavior - making it the only option for hot-pluggable, low-skew, reconfigurable memory or control bus architectures.

Availability

SN74CBTLV16212GR is available at Aetrix Electronics and suitable for telecom backplane switching, memory interconnect arbitration, and hot-swap I/O expansion requiring stable component supply across multi-year production cycles.

Supply support for SN74CBTLV16212GR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74CBTLV16212GR belongs to TI's Widebus™ family of high-speed logic devices, engineered specifically for low-latency, low-distortion signal routing in next-generation computing and networking infrastructure.

FAQ

What is the maximum operating frequency supported by the SN74CBTLV16212GR?

The SN74CBTLV16212GR does not specify a clock frequency limit because it is an analog bus switch, not a clocked logic device. Its performance is defined by propagation delay (0.15 ns typ) and bandwidth - supporting signal edges up to ~2.3 GHz (based on t_pd and 10–90% rise time). Actual usable frequency depends on PCB layout, load capacitance, and signal integrity design; for 24-bit parallel buses, it reliably handles DDR2/DDR3 signaling rates.

Does the SN74CBTLV16212GR support hot-swap operation?

Yes, the SN74CBTLV16212GR supports hot-swap operation via its I_off feature, which limits current to ≤10 µA when V_CC = 0 V. This prevents back-driving of powered system rails during insertion/removal. Combined with break-before-make switching and 2000-V HBM ESD rating, the SN74CBTLV16212GR meets core requirements for PCIe and CompactPCI hot-plug compliance when used with appropriate current-limiting circuitry.

Can the SN74CBTLV16212GR be used with 1.8 V logic levels?

No, the SN74CBTLV16212GR is not rated for 1.8 V operation. Its recommended V_CC range is 2.3 V to 3.6 V, and control input thresholds (VIH/VIL) are specified only within that range. Applying 1.8 V to V_CC may result in undefined switching behavior, increased r_on, or failure to meet timing specs. For 1.8 V systems, consider TI's SN74CBT3244 or ON Semiconductor's NLAST4050.

How many distinct switching configurations does the SN74CBTLV16212GR support?

The SN74CBTLV16212GR supports eight distinct switching configurations via its three select inputs (S2, S1, S0), as defined in the function table. These include full disconnect, six single-port mappings (e.g., A1↔B1, A1↔B2), and one dual-port mode (A1↔B1 and A2↔B2 simultaneously). Each configuration applies identically across all 12 A/B pairs, enabling consistent 24-bit data routing or exchange.

Is thermal derating required for the SN74CBTLV16212GR in high-density layouts?

Yes, thermal derating is advised: the SN74CBTLV16212GR has θ_JA = 64°C/W in TSSOP (DGG). At full 128 mA channel current and 3.6 V V_CC, power dissipation can reach ~460 mW. In compact layouts with limited airflow, junction temperature may exceed 125°C. Use ≥2 cm² copper pour under the exposed pad (if present), avoid stacking heat-generating components nearby, and verify thermal performance with IR imaging during validation testing of the SN74CBTLV16212GR.