Texas Instruments SN74CBT16390DGGR

Overview

SN74CBT16390DGGR from Texas Instruments is a 16-bit to 32-bit FET bus switch used for multiplexing/demultiplexing data paths in memory interleaving and PCI bus slot isolation. It features 5-Ω on-state resistance, TTL-compatible inputs, dual independent output enables (OE1/OE2), and operates from 4.5 V to 5.5 V over –40°C to 85°C.

For engineers reviewing the SN74CBT16390DGGR datasheet, SN74CBT16390DGGR pinout, SN74CBT16390DGGR application, or SN74CBT16390DGGR equivalent, key selection factors include its bidirectional 16:32 switching architecture, sub-1 ns propagation delay, latch-up immunity (>250 mA), ESD robustness (2000-V HBM), and TSSOP-56 package compatibility with high-density PCB layouts.

Technical Context

The SN74CBT16390DGGR implements a dual-path FET-based analog switch matrix with two independent enable controls: OE1 connects A-port to 1B-port, OE2 connects A-port to 2B-port, and both low enables simultaneous connection to both B-ports. Its CMOS/TTL/LVTTL-compatible control logic supports mixed-voltage system interfacing without level shifters.

Each of the 16 A-terminals switches bidirectionally to two corresponding B-terminals (1B_n and 2B_n), forming a total of 32 B-side I/Os. The device uses low-threshold transmission gates with no internal logic latching-operation is purely analog signal pass-through governed by OE states and supply voltage.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 12.5 mm × 6.1 mm × 1.2 mm body height, 0.5 mm pitch, lead-free NiPdAu finish, MSL 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 SN74CBTD16210DGGR and SN74CBT16210DGGR, the SN74CBT16390DGGR uniquely delivers dual independent enables for dynamic 16:32 path selection within a single 5-V supply, making it optimal for memory interleaving and PCI slot arbitration where flexible, low-latency routing is essential.

Availability

SN74CBT16390DGGR is available at Aetrix Electronics and suitable for memory interleaving, PCI bus isolation, legacy bus expansion, and test access multiplexing requiring stable component supply, long-term industrial availability, and RoHS-compliant packaging.

Supply support for SN74CBT16390DGGR 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 decades of innovation in high-speed interface and bus-switching technologies.

The SN74CBT16390DGGR belongs to TI's Widebus™ family of high-performance FET bus switches, designed specifically for low-distortion, high-bandwidth signal routing in memory, PCI, and industrial backplane applications.

FAQ

What is the maximum continuous current per channel for the SN74CBT16390DGGR?

The SN74CBT16390DGGR supports a continuous channel current of 128 mA per switch path, as specified in its absolute maximum ratings. This rating applies across the full operating temperature range (–40°C to 85°C) and ensures reliable conduction without thermal derating under typical 5-V supply conditions. Exceeding this limit risks permanent damage or accelerated wear-out of the internal FET structures.

Does the SN74CBT16390DGGR require external pull-up or pull-down resistors on its OE pins?

No, the SN74CBT16390DGGR does not require external pull-up or pull-down resistors on OE1 or OE2. Its control inputs are TTL-compatible with defined VIH (≥2 V) and VIL (≤0.8 V) thresholds, and TI's recommended operating conditions specify that unused control inputs must be held at VCC or GND-achievable via direct connection, not resistive termination. External resistors add unnecessary node capacitance and may degrade enable timing.

Can the SN74CBT16390DGGR operate reliably at 3.3 V supply voltage?

No, the SN74CBT16390DGGR is not rated for 3.3 V operation. Its recommended supply voltage range is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. At 3.3 V, the internal FETs fail to fully enhance, resulting in excessive on-state resistance (>20 Ω), increased propagation delay, and potential signal corruption. For 3.3-V systems, consider TI's SN74CBTD16210DGGR instead.

How does the SN74CBT16390DGGR handle simultaneous assertion of OE1 and OE2?

When both OE1 and OE2 are low, the SN74CBT16390DGGR electrically connects the A-port to both 1B and 2B ports simultaneously-enabling true 16-to-32 fanout. This mode is explicitly defined in the function table and supported by the FET architecture; however, designers must ensure the connected loads do not exceed the 128 mA per-channel limit or cause contention if 1B and 2B drive conflicting logic states.

Is the SN74CBT16390DGGR pin-compatible with other devices in the Widebus™ family?

No, the SN74CBT16390DGGR is not pin-compatible with other Widebus™ devices such as SN74CBT16210DGGR or SN74CBTD16210DGGR. Although all use TSSOP-56 packages, their pinouts differ significantly-especially in A/1B/2B terminal assignments and enable signal placement. PCB layout must be dedicated to the SN74CBT16390DGGR's documented top-view pin map to ensure correct signal routing and power integrity.