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Texas Instruments SN74CBT16233DL
- Part No.:
- SN74CBT16233DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16233DL.pdf
- Description:
- IC MUX/DEMUX 16 X 1:2 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:415
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Product details
Overview
SN74CBT16233DL from Texas Instruments is a 16-bit 1-of-2 FET multiplexer/demultiplexer in SSOP-56 package, featuring 5-Ω on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation across –40°C to 85°C. It enables bidirectional signal routing between one A-port and two B-ports (B1/B2) for memory interleaving and bus sharing applications.
For engineers reviewing the SN74CBT16233DL datasheet, SN74CBT16233DL pinout, SN74CBT16233DL application, or SN74CBT16233DL equivalent, key selection criteria include its low on-resistance, absence of through-current during switching, dual-select control architecture (SEL1/SEL2), and TEST-enabled parallel connection mode for A-to-B1+B2 broadcast.
Technical Context
The SN74CBT16233DL implements a 16-channel, dual-path FET switch matrix with independent SEL1/SEL2 logic to route each A-line to either B1 or B2. Its zero-power CMOS-compatible control interface accepts 5-V TTL or CMOS drivers without level translation.
When TEST1/TEST2 are asserted high, the device enters broadcast mode-connecting each A port simultaneously to both corresponding B1 and B2 terminals-enabling diagnostic or redundancy use cases. The design eliminates shoot-through current via non-overlapping gate drive timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.75 V, enabling minimal voltage drop (<150 mV at 30 mA) for high-fidelity analog/digital signal pass-through. |
| Supply voltage (VCC) | 4.75 V to 5.25 V - tightly regulated 5-V operation ensures compatibility with legacy TTL and widebus systems. |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - directly interfaces with standard 5-V TTL outputs without pull-ups or level shifters. |
| Propagation delay (tpd) | 0.25 ns typical - ultra-fast switching supports high-speed data multiplexing up to >1 GHz effective bandwidth. |
| Channel count & configuration | 16 independent 1-of-2 switches - supports two 8-bit paths or one 16-bit path, configurable per channel via shared SEL1/SEL2. |
| Operating temperature | –40°C to 85°C - qualified for industrial-grade embedded and computing applications with thermal stability. |
| Input leakage current | ±1 µA max at VCC = 5.25 V - negligible loading on upstream drivers, preserving signal integrity in fan-out-sensitive buses. |
Pinout & Package
SN74CBT16233DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 0.5-mm pitch, 11.4 mm × 4.4 mm body, and 1.2 mm max height. Pin 1 is located at top-left corner with index area marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A–16A | Common input/output port | Bi-directional data terminal connected to system bus or memory data lines; routed to B1 or B2 based on SEL/TEST state. |
| 1B1–16B1, 1B2–16B2 | Dual output ports | Two independent downstream paths (e.g., Memory Bank 0 / Bank 1); each A-line connects to one B1 and one B2 line simultaneously only when TEST is active. |
| SEL1, SEL2 | Path select controls | Binary-encoded selection: SEL1/SEL2 = L/L → A→B1; H/L → A→B2; X/H → A→B1+B2. No internal pull-up/down - must be externally biased. |
| TEST1, TEST2 | Broadcast enable | Active-high signals forcing A-port connection to both B1 and B2 ports - used for test-mode validation or fault-tolerant routing. |
| VCC, GND (×2) | Power distribution | Dual VCC/GND pairs minimize switching noise and IR drop across high-frequency 16-bit switching; placed opposite corners for optimal decoupling layout. |
Key Features
| Feature | Design Value |
|---|---|
| No through-current switching | Guaranteed break-before-make timing eliminates shoot-through current during path transitions - critical for hot-swap and power-sensitive designs. |
| TTL-compatible control interface | Accepts standard 5-V TTL outputs directly - no external level-shifting circuitry required for integration into legacy microprocessor or FPGA I/O subsystems. |
| Low 5-Ω on-resistance | Minimizes insertion loss and distortion for both digital and analog signals (e.g., clock distribution, memory address/data lines), supporting <100-mV drop at 30 mA. |
| Broadcast mode via TEST inputs | Enables simultaneous connection of all A-lines to both B1 and B2 ports - simplifies boundary scan testing and redundant path activation without firmware changes. |
| Widebus™ family compatibility | Shares footprint, timing, and drive characteristics with TI Widebus portfolio - allows drop-in replacement or mixed-family board design with consistent layout rules. |
Applications
| Memory Interleaving | PCI/ISA Bus Multiplexing |
|---|---|
Use Scenario: Two independent DRAM banks share a single 16-bit data bus while maintaining separate address/control lines. IC Role / Device Role / Timing Role: SN74CBT16233DL acts as a bidirectional 16-bit 1-of-2 data switch, routing read/write cycles between CPU and either bank under SEL1/SEL2 control. Use Value: Enables 2× memory bandwidth utilization without doubling bus width; leverages low ron and sub-nanosecond tpd to avoid timing penalties in high-speed access. | Use Scenario: Legacy PCI or ISA expansion slots require dynamic sharing of a common data/address bus among multiple peripheral cards. IC Role / Device Role / Timing Role: SN74CBT16233DL serves as a bus arbitration switch, isolating inactive peripherals and connecting active ones to host bus under SEL-driven control. Use Value: Eliminates need for discrete bus buffers or complex CPLD logic; TTL-compatible inputs simplify interface to legacy bus controllers. |
| Test Access Port (TAP) Routing | FPGA Configuration Multiplexing |
Use Scenario: JTAG test infrastructure requires routing TDI/TDO/TCK/TMS signals between multiple ASICs or SoCs on a shared test bus. IC Role / Device Role / Timing Role: SN74CBT16233DL functions as a programmable test signal router, selecting which device's JTAG chain connects to the tester via SEL/TEST control. Use Value: Broadcast mode (TEST active) allows parallel visibility of all devices' boundary scan registers - accelerating production test coverage and fault isolation. | Use Scenario: A single configuration controller (e.g., microcontroller or PROM) loads bitstreams into multiple FPGAs on one board. IC Role / Device Role / Timing Role: SN74CBT16233DL routes configuration data (e.g., CCLK, DIN, INIT_B) from one source to selected FPGA target using SEL-coded addressing. Use Value: Reduces component count vs. dedicated configuration PROMs per FPGA; low propagation delay preserves setup/hold timing for high-speed config clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET multiplexer/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16233DGGR | TSSOP-56 package (4.4 mm × 9.7 mm), same electrical specs, lower θJA (64°C/W vs. DL's 56°C/W). | Better thermal performance in dense layouts; smaller footprint but higher assembly cost than SSOP. | Select DGGR for space-constrained PCBs requiring improved thermal dissipation without changing logic or timing behavior. |
| SN74CBT16233DGVR | TVSOP-56 package (3.5 mm × 9.7 mm), identical functionality, lowest profile (1.2 mm height), θJA = 48°C/W. | Optimized for ultra-thin modules and portable electronics where Z-height is critical. | Choose DGVR when mechanical envelope limits stack height, especially in handheld or stacked-board assemblies. |
Compared with SN74CBT16233DL, the DGGR offers superior thermal resistance in a slightly narrower body, while DGVR delivers the smallest Z-profile and best thermal performance - all three share identical switching characteristics, pinout, and logic behavior, differing only in mechanical form factor and thermal metrics.
Availability
SN74CBT16233DL is available at Aetrix Electronics and suitable for memory interleaving, legacy bus sharing, JTAG test routing, and FPGA configuration multiplexing requiring stable component supply and long-term industrial availability.
Supply support for SN74CBT16233DL 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 heritage in high-reliability interface and bus technologies.
The SN74CBT16233DL belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-distortion, low-latency signal routing in memory, bus, and test infrastructure applications.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT16233DL?
The SN74CBT16233DL supports a continuous channel current of 128 mA per switch. This rating ensures robust operation under sustained load conditions without thermal derating in typical industrial ambient temperatures. The device's 5-Ω on-resistance results in ≤640 mW power dissipation per channel at full current, well within safe operating limits defined by its SSOP-DL thermal impedance of 56°C/W.
Does the SN74CBT16233DL require external pull-up or pull-down resistors on SEL and TEST inputs?
Yes - the SN74CBT16233DL has no internal pull-up or pull-down resistors on SEL1, SEL2, TEST1, or TEST2 inputs. All unused control inputs must be externally held at VCC or GND to prevent floating states that could cause undefined switching behavior or increased ICC. TI recommends referencing application report SCBA004 for proper biasing techniques in mixed-signal environments.
Can the SN74CBT16233DL operate with a 3.3-V supply?
No - the SN74CBT16233DL is specified only for 4.75 V to 5.25 V operation. Its absolute maximum VCC rating is 7 V, but recommended operation requires 5-V nominal supply. Using 3.3 V will result in insufficient gate drive for the internal FETs, leading to elevated on-resistance (>20 Ω), slow switching, and potential signal corruption. For 3.3-V systems, consider TI's SN74CBTLV series instead.
How does the TEST input affect signal routing in the SN74CBT16233DL?
When TEST1 and TEST2 are driven high, the SN74CBT16233DL enters broadcast mode: each A-port connects simultaneously to both its corresponding B1 and B2 terminals, regardless of SEL1/SEL2 state. This enables parallel diagnostics, redundancy verification, or multi-drop signal injection - a function unavailable in standard 1-of-2 operation and unique to the CBT16233 family.
Is the SN74CBT16233DL pin-compatible with other Widebus™ multiplexers like the SN74CBT16210?
No - the SN74CBT16233DL is not pin-compatible with SN74CBT16210 or other members of the Widebus™ multiplexer family. While both are 16-bit switches, SN74CBT16233DL uses a 56-pin SSOP with dual B-ports and TEST/SEL controls, whereas SN74CBT16210 is a 48-pin device with different pin assignment, fewer control signals, and no broadcast mode. Board-level substitution requires layout revision.
SN74CBT16233DL 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:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74CBT16233DL FAQ
1.How can I place an order for SN74CBT16233DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16233DL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74CBT16233DL reliable?
The price and inventory of SN74CBT16233DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16233DL is usually 5 days.
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SN74CBT16233DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16233DL 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 SN74CBT16233DL?
For technical support, including SN74CBT16233DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16233DL requirements.
6.How does Aetrix verify that SN74CBT16233DL is sourced from the original manufacturer or authorized distributors?
All SN74CBT16233DL 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 SN74CBT16233DL meets industry standards.
7.What is the process for return or replacement of SN74CBT16233DL?
All SN74CBT16233DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16233DL, 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 SN74CBT16233DL part is unused and in its original packaging.
Return procedure for SN74CBT16233DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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