Texas Instruments SN74CBT16212ADL

Overview

SN74CBT16212ADL from Texas Instruments is a 24-bit high-speed TTL-compatible bus switch IC operating as either a 24-bit bus switch or 12-bit bus exchanger, featuring 5-Ω on-state resistance, 0.25 ns typical propagation delay at 5 V, and operation over −40°C to 85°C. It enables bidirectional data routing between four signal ports (A1–A12, B1–B12) via three select inputs (S0–S2) in SSOP-56 packaging for memory expansion and multiplexed data path applications.

For engineers reviewing the SN74CBT16212ADL datasheet, SN74CBT16212ADL pinout, SN74CBT16212ADL application, or SN74CBT16212ADL equivalent, key selection criteria include its 5-Ω r_on, 128 mA continuous channel current rating, TTL-compatible control inputs, latch-up immunity (>250 mA), and SSOP-56 thermal performance (θ_JA = 56°C/W).

Technical Context

The SN74CBT16212ADL implements a 24-channel analog switch matrix controlled by three binary-select inputs (S0–S2), supporting eight distinct connection states including full disconnect, A↔B port mirroring, and cross-exchange modes. Its architecture uses low-threshold transmission gates with no internal level-shifting or buffering - all I/Os are passive, bidirectional, and voltage-transparent.

Each switch channel exhibits matched on-resistance (4–7 Ω typical at 4.5 V), minimal charge injection (<0.5 pC), and low off-capacitance (7.5 pF), enabling clean signal pass-through for DC-coupled digital buses up to 100 MHz. Control logic operates at TTL voltage thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2 V) independent of V_CC level within 4–5.5 V range.

Key Specifications

Pinout & Package

SN74CBT16212ADL is housed in a 56-pin Shrink Small Outline Package (SSOP-DL), 13.9 mm × 7.5 mm body size, 0.5 mm lead pitch, with exposed pad not present and moisture sensitivity 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 SN74CBT16212ADGGR, the SN74CBT16212ADL offers lower thermal resistance (56 vs. 64°C/W) in a slightly larger SSOP package, while SN74CBTD16212DGGR adds bus-hold but increases on-resistance and quiescent current - making SN74CBT16212ADL the preferred choice for low-distortion, low-power, thermally sensitive bus switching.

Availability

SN74CBT16212ADL is available at Aetrix Electronics and suitable for memory expansion interfaces, PCI/ISA bus multiplexing, test equipment signal routing, and digital audio data switching requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for SN74CBT16212ADL 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 high-reliability components.

The SN74CBT16212ADL belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, low-distortion signal routing in industrial computing, telecom infrastructure, and test instrumentation.

FAQ

What is the maximum operating frequency supported by the SN74CBT16212ADL?

The SN74CBT16212ADL does not specify a maximum clock frequency, as it is an analog switch-not a clocked device-but its 0.25 ns typical propagation delay and 7.5 pF off-capacitance enable reliable operation with digital signals up to 100 MHz. Signal integrity depends on trace impedance matching and load capacitance; TI's SCDS007U characterizes performance with CL = 50 pF.

Does the SN74CBT16212ADL require external pull-up or pull-down resistors on its control inputs?

No, the SN74CBT16212ADL does not require external biasing on S0–S2 inputs, but TI recommends holding all unused control inputs at V_CC or GND to prevent floating states that could cause partial conduction or increased ICC. This guidance is specified in TI application report SCBA004 and applies directly to the SN74CBT16212ADL.

Can the SN74CBT16212ADL be used with 3.3-V logic systems?

The SN74CBT16212ADL is not rated for 3.3-V operation: its minimum V_CC is 4 V, and TTL-compatible inputs require VIH ≥ 2 V - which is valid only when V_CC ≥ 4 V. Using it with 3.3-V supplies risks undefined switching behavior and violates recommended operating conditions per SCDS007U. For 3.3-V systems, consider SN74CB3Q16212 or similar 3.3-V-optimized variants.

How many simultaneous connections can the SN74CBT16212ADL configure between Port A and Port B?

The SN74CBT16212ADL supports eight distinct connection configurations defined by the S0–S2 select inputs, including full disconnect, 12-bit direct mapping (A1↔B1, A2↔B2), and 12-bit cross-mapping (A1↔B2, A2↔B1). Each configuration activates exactly 12 bidirectional paths - never 24 - as confirmed by the function table in the SN74CBT16212ADL datasheet SCDS007U.

Is the SN74CBT16212ADL RoHS compliant and lead-free?

Yes, the SN74CBT16212ADL is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as documented in TI's Package Option Addendum. Its MSL rating is Level-1-260°C-UNLIM, confirming suitability for standard lead-free reflow profiles without special baking requirements.