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Texas Instruments SN74CBT16232DL
- Part No.:
- SN74CBT16232DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16232DL.pdf
- Description:
- IC MUX/DEMUX 16 X 1:2 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:258
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Product details
Overview
SN74CBT16232DL from Texas Instruments is a synchronous 16-bit 1-of-2 FET multiplexer/demultiplexer in SSOP-56 package, featuring 5-Ω on-state resistance, TTL-compatible I/O levels, and clock-synchronized operation with CLK/CLKEN control. It enables bidirectional data routing between two B-port banks (B1/B2) and one A-port bus in high-speed digital systems such as memory expansion interfaces and FPGA I/O bridging.
For engineers reviewing the SN74CBT16232DL datasheet, SN74CBT16232DL pinout, SN74CBT16232DL application, or SN74CBT16232DL equivalent, this page delivers verified electrical parameters, functional timing behavior, package-specific layout guidance, and real-world implementation context for synchronous bus switching in industrial and communications equipment.
Technical Context
The SN74CBT16232DL implements a clocked, edge-triggered 16-bit 1-of-2 switch architecture using low-Ron FETs. Its operation is governed by S0/S1 select inputs sampled on the rising edge of CLK when CLKEN is low; the device holds its last state when CLKEN is high.
Each of the 16 channels supports bidirectional signal flow with no direction pin, and all I/Os tolerate 5.5-V inputs while operating from a 4-V to 5.5-V VCC supply. The device exhibits 0.35-ns typical propagation delay (A↔B) and 6.7-ns CLK-to-output delay under 5-V conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage logic domains without level shifters. |
| ron (Typ) | 5 Ω at VCC = 4.5 V - Enables minimal signal attenuation and <100-mV voltage drop at 30-mA channel current. |
| tpd (A↔B) | 0.35 ns (VCC = 5 V) - Supports >150-MHz clock operation with sub-nanosecond path delay for high-speed bus multiplexing. |
| fclock | 150 MHz - Maximum synchronous switching rate determined by setup/hold timing and internal clock path delay. |
| tsu/th (S0/S1) | 2.2 ns setup / 0.5 ns hold before/after CLK↑ - Defines minimum control timing margin for reliable state capture. |
| IOFF Leakage | ±1 μA at VCC = 5.5 V - Guarantees negligible standby current in powered-down or isolated signal paths. |
| Cio(OFF) | 4–6.5 pF (B port / A port) - Limits capacitive loading on inactive channels to preserve signal integrity in high-frequency buses. |
Pinout & Package
SN74CBT16232DL is housed in a 56-pin SSOP (Shrink Small Outline Package) with 0.5-mm pitch, 13.9-mm body width, and 1.2-mm max height. Pin 1 is located at the top-left corner with a molded index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A–16A | A-port data lines (bidirectional) | Primary bus interface; connects to system controller or processor data bus. |
| 1B1–16B1 | B1-port data lines (bidirectional) | First 16-bit data path; selected when S1S0 = 00 or 01 per function table. |
| 1B2–16B2 | B2-port data lines (bidirectional) | Second 16-bit data path; selected when S1S0 = 10 or 11 per function table. |
| S0, S1 | Address select inputs | Determine active B-port bank (B1 or B2); sampled synchronously on CLK↑ when CLKEN = L. |
| CLK | Clock input | Rising-edge-triggered control signal; gates update of internal switch state and output enable. |
| CLKEN | Clock enable input | When high, freezes current switch configuration; when low, allows CLK-triggered reconfiguration. |
| VCC | Power supply | 4–5.5 V supply for logic and switch operation; decoupling required near pins 27 and 55. |
| GND | Ground reference | Common return for all I/O and internal circuitry; connected to pins 26 and 56 for low-inductance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous switching | Edge-triggered operation eliminates metastability and ensures deterministic state transitions across all 16 channels simultaneously. |
| 5-Ω low on-resistance | Minimizes insertion loss and maintains signal rise/fall times below 100 ps in 50-Ω systems. |
| TTL-compatible I/O | Accepts 0.8-V/2-V logic thresholds and drives 4-mA loads at 0.4-V VOL, enabling direct interfacing with legacy 5-V logic families. |
| High-speed timing | 150-MHz maximum clock frequency and 0.35-ns A↔B propagation delay support DDR2/DDR3 address/command bus multiplexing. |
| State-hold mode | CLKEN = H latches current switch configuration indefinitely, eliminating need for continuous clocking during static data routing. |
Applications
| Memory Expansion Interface | FPGA I/O Multiplexing |
|---|---|
|
Use Scenario: Expanding 32-bit memory bus from a 16-bit microcontroller using dual 16-bit SRAM banks. IC Role / Device Role / Timing Role: Synchronous 1-of-2 demultiplexer routing address/data between controller and either SRAM bank based on bank-select address bits. Use Value: Eliminates glue logic and reduces PCB layer count by consolidating two independent memory paths into one shared bus with precise clock-aligned switching. |
Use Scenario: Sharing a single high-speed test access port (JTAG or boundary scan) among multiple FPGA devices on a board. IC Role / Device Role / Timing Role: Bidirectional 16-bit multiplexer enabling clock-synchronized selection of one FPGA's TAP controller signals. Use Value: Maintains IEEE 1149.1 timing compliance with sub-nanosecond skew across all TMS/TCK/TDI/TDO lines during dynamic device selection. |
| PCI Express Lane Multiplexing | Industrial Backplane Switching |
|
Use Scenario: Dynamically rerouting PCIe x4 lanes between two peripheral slots using a single upstream root complex port. IC Role / Device Role / Timing Role: Synchronous 16-bit 1-of-2 multiplexer controlled by system management firmware via GPIO and clock domain crossing logic. Use Value: Achieves lane-level failover without link renegotiation by preserving LTSSM state through zero-latency switch hold (CLKEN = H) during reconfiguration. |
Use Scenario: Isolating redundant CAN or RS-485 transceiver pairs in rail signaling or factory automation backplanes. IC Role / Device Role / Timing Role: Bidirectional analog/digital signal switch enabling hot-swappable module replacement without powering down the entire backplane. Use Value: Prevents bus contention during module insertion/removal by ensuring only one transceiver pair is electrically connected at any time, enforced by synchronous enable timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16232DGGR | Same die, TSSOP-56 package (0.5-mm pitch, 1.2-mm height), tape-and-reel packaging. | Preferred for automated SMT assembly; slightly lower thermal resistance (θJA = 64°C/W vs. 56°C/W) due to thinner profile. | Select DGGR for volume production requiring pick-and-place compatibility and tighter board space constraints. |
| SN74LVC1G3157DCKR | Single-channel, 2:1 analog switch; CMOS-based, 5-V tolerant, but asynchronous and non-synchronous. | Limited to low-speed, non-timing-critical signal routing; lacks CLK/CLKEN synchronization and multi-bit coordination. | Use only for discrete signal switching where deterministic timing and 16-bit coherency are not required. |
Compared with SN74CBT16232DGGR, the SN74CBT16232DL offers identical electrical performance but higher thermal resistance and tube packaging-making it suitable for prototyping and low-volume validation. Compared with SN74LVC1G3157DCKR, the SN74CBT16232DL provides synchronized 16-bit operation essential for bus integrity in high-speed digital systems.
Availability
SN74CBT16232DL is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O routing, PCIe lane sharing, and industrial backplane switching requiring stable component supply and long-term manufacturability.
Supply support for SN74CBT16232DL 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74CBT16232DL belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for synchronous, low-latency, multi-bit data path management in memory subsystems and programmable logic interconnects.
FAQ
What is the maximum clock frequency supported by the SN74CBT16232DL?
The SN74CBT16232DL supports a maximum clock frequency of 150 MHz across the full operating temperature range (–40°C to 85°C). This rating is validated under recommended conditions (VCC = 4 V to 5.5 V) and accounts for setup/hold timing margins and internal propagation delays. Exceeding this frequency may result in metastability or incorrect state capture on S0/S1 inputs.
Does the SN74CBT16232DL require external pull-up or pull-down resistors on control pins?
Yes, all unused control inputs-including S0, S1, CLK, and CLKEN-must be held at VCC or GND to ensure proper device operation. TI explicitly recommends this in the "Recommended Operating Conditions" section to prevent floating inputs from causing excessive supply current or undefined switching behavior. The SN74CBT16232DL does not include internal biasing on these pins.
Can the SN74CBT16232DL operate with a 3.3-V supply?
No, the SN74CBT16232DL is not rated for 3.3-V operation. Its recommended VCC range is 4 V to 5.5 V, and absolute maximum ratings specify –0.5 V to 7 V. At 3.3 V, the device fails to meet VIH/VIL thresholds (VIH = 2 V min, VIL = 0.8 V max), resulting in unreliable logic recognition and degraded on-resistance performance. Use SN74LVC16232 or similar 3.3-V logic-family alternatives instead.
How does the CLKEN pin affect the switching behavior of the SN74CBT16232DL?
When CLKEN is high, the SN74CBT16232DL holds its last configured switch state regardless of CLK activity-effectively freezing the A-to-B1/B2 connection. When CLKEN is low, the device samples S0/S1 on each rising CLK edge and updates the switch path accordingly. This enables glitch-free hold modes during system reconfiguration without requiring continuous clocking.
Is the SN74CBT16232DL pin-compatible with other members of the CBT16232 family?
Yes, the SN74CBT16232DL shares identical pinout and functionality with SN74CBT16232DGGR and SN74CBT16232DLR. All variants use the same 56-pin mapping for A/B ports, S0/S1, CLK, CLKEN, VCC, and GND. Differences are limited to package type (SSOP vs. TSSOP), packaging format (tube vs. tape-and-reel), and thermal characteristics-not electrical or logical interface.
SN74CBT16232DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 16 x 1:2
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74CBT16232DL FAQ
1.How can I place an order for SN74CBT16232DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16232DL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74CBT16232DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16232DL is usually 5 days.
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Once your SN74CBT16232DL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74CBT16232DL?
For technical support, including SN74CBT16232DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16232DL requirements.
6.How does Aetrix verify that SN74CBT16232DL is sourced from the original manufacturer or authorized distributors?
All SN74CBT16232DL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74CBT16232DL meets industry standards.
7.What is the process for return or replacement of SN74CBT16232DL?
All SN74CBT16232DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16232DL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74CBT16232DL part is unused and in its original packaging.
Return procedure for SN74CBT16232DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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