Texas Instruments SN74CBT16214CDLR

Overview

SN74CBT16214CDLR from Texas Instruments is a 12-bit, 1-of-3 FET bus switch with bidirectional signal routing, 3 Ω typical ON-state resistance (ron), <0.24 ns propagation delay at 4 V, and −2 V undershoot protection on A/B ports. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in PCI bus isolation and high-speed digital interconnect applications.

For engineers reviewing the SN74CBT16214CDLR datasheet, SN74CBT16214CDLR pinout, SN74CBT16214CDLR application, or SN74CBT16214CDLR equivalent, key selection criteria include its 56-pin SSOP package, Ioff partial-power-down capability, 5.5 pF typical OFF-state B-port capacitance, and 3 µA max ICC - all critical for low-distortion, hot-swap-capable bus gating.

Technical Context

This device implements twelve independent 1-of-3 analog/digital multiplexer/demultiplexer channels, each controlled by three select lines (S0–S2). Each channel routes one A-port signal to one of three B-port terminals (B1/B2/B3) or disconnects all paths when select codes are invalid.

Its FET-based architecture enables near-zero propagation delay, rail-to-rail signal handling (0–5.5 V), and active undershoot-protection circuitry that clamps A/B port voltages down to −2 V while maintaining OFF-state isolation. The Ioff feature guarantees <10 µA backflow current when VCC = 0 V, enabling true partial-power-down operation.

Key Specifications

Pinout & Package

SN74CBT16214CDLR uses a 56-pin SSOP (DL) package with 0.5 mm pitch, 13.9 mm × 7.9 mm body size, and 1.2 mm max height. Pin 1 is located at top-left corner with molded index mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16214CDGGR, SN74CBT16214CDLR offers lower thermal resistance and larger solder joint area in SSOP; compared with SN74CBTD16211DGGR, it provides full 1-of-3 routing flexibility at lower ron and faster tpd, making it optimal for PCI and multi-bank isolation where address decoding is already available.

Availability

SN74CBT16214CDLR is available at Aetrix Electronics and suitable for PCI interface design, hot-swappable backplane systems, and multi-voltage logic translation requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for SN74CBT16214CDLR 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 technologies, with decades of expertise in high-speed logic and interface solutions.

SN74CBT16214CDLR belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-distortion, low-latency signal gating in PCI, memory, and mixed-voltage system interconnects.

FAQ

What is the maximum undershoot voltage the SN74CBT16214CDLR can withstand on its A and B ports?

The SN74CBT16214CDLR features active undershoot-protection circuitry rated for −2 V on both A and B ports. This specification is verified under VCC = 5.5 V with the switch disabled, ensuring reliable OFF-state isolation even during transient negative excursions common in hot-plug and ESD events. The protection operates independently of control inputs and requires no external components.

Does the SN74CBT16214CDLR support partial-power-down operation, and how is it implemented?

Yes, the SN74CBT16214CDLR supports partial-power-down via its Ioff feature. When VCC = 0 V, the device limits backflow current to ≤10 µA regardless of voltage applied to A or B ports. This behavior is inherent to the FET structure and undershoot-protection circuitry - no external pull-downs or sequencing controls are needed to achieve safe isolation during power-off conditions.

What is the pin compatibility status between SN74CBT16214CDLR and SN74CBT16214CDGGR?

SN74CBT16214CDLR (SSOP-DL) and SN74CBT16214CDGGR (TSSOP-DGG) share identical pin functions and signal assignments across all 56 terminals, including A/B ports, selects, VCC, and GND. However, they are not mechanically interchangeable due to different package dimensions, pitch, and thermal characteristics - PCB layout must be redesigned for package substitution.

Can the SN74CBT16214CDLR operate with 1.8-V or 2.5-V control inputs while powered at 5 V?

No - the SN74CBT16214CDLR control inputs (S0, S1, S2) require VIH ≥ 2 V and VIL ≤ 0.8 V under recommended operating conditions. While data I/Os support 0.8–5-V signaling, the select inputs are TTL/CMOS-compatible only at 3.3 V or 5 V logic levels. Driving them with 1.8-V or 2.5-V signals may result in undefined switching behavior or increased ICC.

What is the typical ON-state resistance (ron) of the SN74CBT16214CDLR, and how does it vary with load current?

The SN74CBT16214CDLR has a typical ON-state resistance of 3 Ω at VCC = 4.5 V, VI = 0 V, and IO = 30 mA. At VCC = 4 V and IO = 64 mA, ron remains ≤12 Ω. This low, stable ron ensures minimal voltage drop (<384 mV at 64 mA), preserving signal swing and reducing power dissipation in high-speed bus applications.