Texas Instruments SN74CBT16213DLR

Overview

SN74CBT16213DLR from Texas Instruments is a 24-bit FET bus-exchange switch in the Widebus™ family, operating as either a 24-bit bidirectional bus switch or a 12-bit data-exchange switch with three select inputs (S0–S2). It features 5-Ω typical on-state resistance, TTL-compatible control inputs, and supports 4 V to 5.5 V supply operation across –40°C to 85°C. It enables low-latency signal routing in high-speed digital backplanes and memory interface multiplexing.

For engineers reviewing the SN74CBT16213DLR datasheet, SN74CBT16213DLR pinout, SN74CBT16213DLR application, or SN74CBT16213DLR equivalent, key selection criteria include its 24-pin dual-port architecture, sub-1 ns propagation delay, 128 mA continuous channel current rating, and TSSOP-56 package thermal performance (θ_JA = 64°C/W).

Technical Context

The SN74CBT16213DLR implements a CMOS-based FET switch matrix controlled by three binary-select inputs (S0–S2), enabling eight distinct connection modes between two 12-bit port groups (A and B). Its architecture supports both transparent bus switching and cross-port data exchange without latching or level-shifting.

Each of the 24 switch channels exhibits matched on-resistance (r_on = 8–15 Ω at V_CC = 4.5 V), low input capacitance (C_i = 4.5 pF), and off-state isolation >8 pF per port - ensuring minimal capacitive loading and signal integrity in high-frequency parallel buses.

Key Specifications

Pinout & Package

The SN74CBT16213DLR is housed in a 56-pin TSSOP (DGG) package with 0.5 mm pitch, 13.9 mm × 6.0 mm body size, and 1.2 mm max height. Pin 1 is located in Quadrant Q1 per tape orientation standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16213DLR, SN74CBTD16213DGGR adds bus-hold protection at the cost of higher static current, while 74FST16213MTDX delivers superior speed but sacrifices extended temperature support - making SN74CBT16213DLR the optimal balance for industrial bus-exchange applications requiring reliability across –40°C to 85°C.

Availability

SN74CBT16213DLR is available at Aetrix Electronics and suitable for memory bus multiplexing, PCI/ISA isolation, and FPGA I/O expansion requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74CBT16213DLR 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 over 90 years of innovation in industrial, automotive, and communications markets.

The SN74CBT16213DLR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in parallel digital systems where timing predictability and minimal insertion loss are critical.

FAQ

What is the primary function of the SN74CBT16213DLR?

The SN74CBT16213DLR functions as a 24-bit bidirectional FET bus switch or a 12-bit bus exchanger, enabling configurable signal routing between two 12-bit port groups (A and B) via three select inputs (S0–S2). It provides low on-resistance (8–15 Ω), sub-nanosecond propagation delay, and TTL-compatible control - making it ideal for high-speed digital interconnects without added latency or level translation.

Does the SN74CBT16213DLR require external pull-up or pull-down resistors on control inputs?

No. The SN74CBT16213DLR has TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and specifies that all unused control inputs must be tied to V_CC or GND to ensure proper operation. External resistors are unnecessary if driven directly by compatible logic; however, floating inputs must be avoided to prevent increased ICC or erratic switching behavior in the SN74CBT16213DLR.

Can the SN74CBT16213DLR operate with a 3.3-V supply?

No. The SN74CBT16213DLR is specified for 4 V to 5.5 V operation only. At 3.3 V, the device fails to meet guaranteed r_on, propagation delay, and control-input threshold specifications. For 3.3-V systems, consider TI's SN74CB3Q16213 or similar 3.3-V–optimized bus switches - the SN74CBT16213DLR is not rated for reliable operation below 4 V.

How does the SN74CBT16213DLR handle signal directionality?

The SN74CBT16213DLR is inherently bidirectional: each of its 24 switch channels passes signals equally well in either direction with no internal direction control. Signal flow is determined solely by external voltage differentials across the A and B terminals - there is no driver/receiver distinction. This makes the SN74CBT16213DLR suitable for true bidirectional buses like memory data lines or shared control busses.

What thermal considerations apply to the SN74CBT16213DLR in high-density layouts?

The SN74CBT16213DLR in TSSOP-DGG package has θ_JA = 64°C/W. Under worst-case conditions (5.5 V, 128 mA per channel across all 24 paths), power dissipation may approach 1.2 W - requiring adequate copper pour, thermal vias, and airflow. Layouts should avoid placing heat-sensitive components adjacent to the SN74CBT16213DLR and follow TI's DGG0056A land pattern guidelines to ensure solder joint reliability and thermal transfer.