Texas Instruments SN74CBT16232DGGR

Overview

SN74CBT16232DGGR 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-select control (S0/S1) synchronized by CLK/CLKEN. It operates from 4 V to 5.5 V across –40°C to 85°C and is used in high-speed data path switching for telecom backplanes and FPGA I/O expansion.

For engineers reviewing the SN74CBT16232DGGR datasheet, SN74CBT16232DGGR pinout, SN74CBT16232DGGR application, or SN74CBT16232DGGR equivalent, key selection criteria include clock-synchronized switching timing (tsu = 2.2 ns, th = 0.5 ns), low propagation delay (tpd = 0.35 ns), and TSSOP-56 package compatibility with dense PCB layouts.

Technical Context

The SN74CBT16232DGGR implements a synchronous bus switch architecture using NMOS FETs with no internal latches or logic gates-data routing is controlled solely by CLK edge-triggered sampling of S0/S1. Its operation requires CLKEN low to enable state updates; when CLKEN is high, the switch retains its last configured path.

It supports bidirectional signal flow between A-port (16 pins) and two independent B-ports (B1/B2, each 16 pins), with all 32 signal paths sharing identical electrical characteristics: ron ≤ 20 Ω (max), Cio(OFF) ≤ 6.5 pF (A port), and VIH/VIL thresholds fixed at 2 V / 0.8 V for TTL compatibility.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm body, 0.5-mm lead pitch, 1.2-mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT16232DLR and SN74CBTD16211DGGR, the SN74CBT16232DGGR uniquely delivers TSSOP-56 density, sub-nanosecond timing, and guaranteed clock-synchronized operation-critical for FPGA-adjacent and telecom infrastructure designs where signal coherency across 16-bit paths is mandatory.

Availability

SN74CBT16232DGGR is available at Aetrix Electronics and suitable for telecom line card switching, FPGA I/O expansion, industrial PLC backplane isolation, and automated test equipment signal routing requiring stable component supply and full production lifecycle support.

Supply support for SN74CBT16232DGGR 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74CBT16232DGGR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, clock-synchronized data path multiplexing in dense digital systems.

FAQ

What is the maximum clock frequency supported by the SN74CBT16232DGGR?

The SN74CBT16232DGGR supports a maximum clock frequency of 150 MHz across the full operating temperature range (–40°C to 85°C), as specified in the timing requirements table. This rating is validated under recommended conditions (VCC = 4 V to 5.5 V) and assumes proper PCB layout with minimized trace inductance and adequate power supply decoupling near the SN74CBT16232DGGR VCC pins.

Does the SN74CBT16232DGGR require external pull-up or pull-down resistors on control inputs?

No, the SN74CBT16232DGGR does not require external pull-up or pull-down resistors on S0, S1, CLK, or CLKEN inputs. All unused control inputs must be held at VCC or GND per TI's SCBA004 application report, but the device's TTL-compatible input structure provides sufficient noise margin without external biasing-provided PCB traces are routed away from noisy sources and kept short.

Can the SN74CBT16232DGGR operate with a 3.3-V supply?

No, the SN74CBT16232DGGR is not rated for 3.3-V operation. Its recommended supply voltage range is 4 V to 5.5 V, and absolute maximum ratings specify VCC down to –0.5 V but functional operation below 4 V is not guaranteed. Using 3.3 V may result in undefined switching behavior, increased on-resistance, or failure to meet timing specifications-always use 4 V minimum for reliable SN74CBT16232DGGR operation.

How does the CLKEN pin affect the switching behavior of the SN74CBT16232DGGR?

When CLKEN is high, the SN74CBT16232DGGR holds its last configured data path (A↔B1 or A↔B2) regardless of changes to S0/S1 or CLK activity-effectively freezing the switch state. Only when CLKEN is low does the device sample S0/S1 on the next CLK rising edge to update routing. This allows glitch-free state retention during control signal reconfiguration or clock interruptions.

Is the SN74CBT16232DGGR pin-compatible with other devices in the CBT16xxx family?

The SN74CBT16232DGGR shares the same TSSOP-56 (DGG) package outline and pin numbering as SN74CBT16232DLR and SN74CBT16232DL, but it is not functionally pin-compatible with unrelated CBT16xxx variants like SN74CBT16210 or SN74CBT16244 due to differences in control logic, pin assignments (e.g., presence of CLK/CLKEN vs. OE), and internal routing architecture-always verify pin functions against the specific SN74CBT16232DGGR logic diagram before substitution.