Texas Instruments SN74CBT16232DLR

Overview

SN74CBT16232DLR from Texas Instruments is a synchronous 16-bit 1-of-2 FET multiplexer/demultiplexer with 5-Ω on-state resistance, TTL-compatible I/O levels, and dual B-port configuration (B1/B2) for bidirectional data routing. It operates from 4 V to 5.5 V supply, supports up to 150 MHz clock frequency, and is used in high-speed bus switching applications such as memory expansion interfaces and FPGA I/O consolidation.

For engineers reviewing the SN74CBT16232DLR datasheet, SN74CBT16232DLR pinout, SN74CBT16232DLR application, or SN74CBT16232DLR equivalent, key selection considerations include synchronous clock/CLKEN control timing (tsu = 2.2 ns, th = 0.5 ns), low propagation delay (tpd = 0.35 ns), and SSOP-56 package compatibility with industrial temperature range (–40°C to 85°C).

Technical Context

The SN74CBT16232DLR implements a synchronous, edge-triggered 16-bit 1-of-2 switch architecture using NMOS FETs with no internal level-shifting circuitry. Data path selection between B1 and B2 ports is controlled by S0/S1 inputs sampled on the rising edge of CLK when CLKEN is low; CLKEN = high holds the last state.

Each of the 16 A-B1/B2 channels features independent bidirectional conduction with matched on-resistance (ron = 5–7 Ω at VCC = 4.5 V), low off-capacitance (Cio(OFF) = 4–6.5 pF), and rail-to-rail analog signal handling capability up to VCC.

Key Specifications

Pinout & Package

SN74CBT16232DLR is housed in a 56-pin SSOP (DL) package measuring 13.9 mm × 7.4 mm × 1.95 mm (max height), with 0.5-mm lead pitch and gull-wing terminations compatible with standard reflow profiles (MSL Level-1, 260°C peak).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous 16-bit bus switching applications.

Compared with SN74CBT16232DGGR and SN74CBTD16211DLR, the SN74CBT16232DLR uniquely delivers synchronous 16-bit 1-of-2 switching in SSOP packaging-enabling deterministic time-multiplexed routing where clock alignment and mechanical compatibility with legacy SSOP layouts are critical.

Availability

SN74CBT16232DLR is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and FPGA-based embedded systems requiring stable component supply across extended product lifecycles.

Supply support for SN74CBT16232DLR 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 electronic components.

The SN74CBT16232DLR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, low-distortion signal routing in industrial, communications, and computing infrastructure.

FAQ

What is the maximum clock frequency supported by the SN74CBT16232DLR?

The SN74CBT16232DLR supports a maximum clock frequency of 150 MHz across the full operating temperature range (–40°C to +85°C). This specification is verified under recommended conditions (VCC = 5 V, CL = 50 pF) and enables reliable time-multiplexed operation in high-speed memory and test interfaces. The SN74CBT16232DLR maintains consistent timing margins with setup time (tsu) of 2.2 ns and hold time (th) of 0.5 ns relative to CLK rising edge.

Does the SN74CBT16232DLR require external pull-up or pull-down resistors on control inputs?

Yes - all unused control inputs (S0, S1, CLKEN) of the SN74CBT16232DLR must be held at VCC or GND to ensure proper device operation and prevent floating states that could cause erratic switching or increased ICC. TI recommends tying unused inputs directly to VCC or GND using short traces; this requirement is documented in the "Recommended Operating Conditions" section of the SN74CBT16232DLR datasheet.

Can the SN74CBT16232DLR operate with a 3.3-V supply?

No - the SN74CBT16232DLR is not rated for 3.3-V operation. Its absolute maximum supply voltage is 7 V, but the recommended operating range is strictly 4 V to 5.5 V. At VCC < 4 V, parameters such as on-resistance (ron), propagation delay (tpd), and input thresholds (VIH/VIL) fall outside guaranteed specifications. For 3.3-V systems, consider TI's SN74CB3Q16210 or similar 3.3-V–optimized bus switches instead of the SN74CBT16232DLR.

How does CLKEN functionality affect the behavior of the SN74CBT16232DLR?

When CLKEN is high, the SN74CBT16232DLR freezes its internal switch configuration and retains the last state established on the prior CLK rising edge - effectively decoupling operation from the clock signal. This allows stable data routing during clock interruptions or controller resets. When CLKEN is low, the device samples S0/S1 on each CLK rising edge to update the selected B-port (B1 or B2), making CLKEN essential for glitch-free hold-mode operation in the SN74CBT16232DLR.

Is the SN74CBT16232DLR pin-compatible with other devices in the CBT16xxx series?

The SN74CBT16232DLR shares the same 56-pin SSOP (DL) footprint and core pinout (A/B1/B2 ports, S0/S1, CLK, CLKEN, VCC, GND) with SN74CBT16232DL and SN74CBT16232DLR.B, but is not pin-compatible with unrelated CBT16xxx variants like SN74CBT16210 or SN74CBT16244 due to differing control architectures (e.g., absence of CLK/CLKEN, different port counts, or OE-based enable schemes). Always verify pin mapping against the specific SN74CBT16232DLR datasheet before layout reuse.