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Texas Instruments SN74CBT16212ADLR
- Part No.:
- SN74CBT16212ADLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16212ADLR.pdf
- Description:
- IC BUS FET EXCH SW 12X2:2 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,772
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Product details
Overview
SN74CBT16212ADLR from Texas Instruments is a 24-bit high-speed TTL-compatible bus switch with 5-Ω on-state resistance, operating at 4 V to 5.5 V supply, supporting bidirectional signal routing between two 12-bit ports via S0–S2 select lines, and used in high-density memory expansion and FPGA I/O bridging applications.
For engineers reviewing the SN74CBT16212ADLR datasheet, SN74CBT16212ADLR pinout, SN74CBT16212ADLR application, or SN74CBT16212ADLR equivalent, key selection criteria include its 0.25 ns typical propagation delay (VCC = 5 V), ±1 µA input leakage, 7.5 pF off-state I/O capacitance, and SSOP-56 package thermal performance (θJA = 56°C/W).
Technical Context
The SN74CBT16212ADLR implements a dual 12-bit bus exchanger architecture controlled by three select inputs (S0, S1, S2), enabling eight distinct switching configurations including port-to-port pass-through, crossbar exchange, and high-impedance disconnect. Its NMOS-only transmission gate design delivers rail-to-rail analog/digital signal handling without level-shifting limitations.
Each of the 24 independent A/B channel pairs exhibits matched on-resistance (4–7 Ω typ at VCC = 4.5 V), sub-1 ns enable/disable timing (ten/tdis ≤ 10.4 ns), and TTL-compatible control thresholds (VIH = 2 V, VIL = 0.8 V), ensuring interoperability with legacy 5-V logic families while maintaining low dynamic power (ICC = 3 µA max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 4–7 Ω typical at VCC = 4.5 V - enables minimal voltage drop (<320 mV at 64 mA) for clean signal integrity in high-speed data paths. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V - supports >1 GHz effective switching rates for DDR memory buffering and FPGA interconnect. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage system rails without external regulation. |
| Input leakage current | ±1 µA max - ensures stable control logic states under hot-swap or partial-power conditions. |
| Off-state I/O capacitance | 7.5 pF - minimizes capacitive loading on adjacent traces, critical for maintaining signal rise/fall times in dense PCB layouts. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded systems including telecom line cards and industrial PLCs. |
| ESD protection | 200-V machine model (JESD 22-A115) - provides robust handling during board assembly and field service. |
Pinout & Package
SN74CBT16212ADLR uses a 56-pin SSOP (Shrink Small Outline Package) with 0.5-mm pitch, 13.9 mm × 7.9 mm body size, and 1.2-mm maximum height. The package features exposed thermal pad (not electrically connected) and conforms to JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 33) | Power supply | Primary 4–5.5 V rail for all internal switches and control logic; decoupling required within 5 mm. |
| GND (Pins 8, 25, 34, 52) | Ground reference | Four dedicated ground pins minimize ground bounce across 24-channel operation; must be tied to solid plane. |
| S0, S1, S2 (Pins 1, 2, 3) | Mode select inputs | 3-bit binary control determining A/B port mapping per function table; TTL-compatible thresholds ensure noise margin. |
| A1–A12, B1–B12 (Pins 4–7, 9–24, 26–32, 35–51, 53–56) | Signal channel terminals | 24 bidirectional I/O pairs; each pair connects A-side to B-side when enabled; no directionality or biasing required. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Enables <320 mV voltage drop at full 64 mA channel current, preserving logic margins in 5-V systems. |
| TTL-compatible control inputs | VIH = 2 V / VIL = 0.8 V eliminates need for level shifters when interfacing with legacy microcontrollers or FPGAs. |
| Latch-up immunity >250 mA | Meets JESD 17 Class II requirements, preventing destructive latch-up during transient overvoltage events. |
| 0.25 ns propagation delay | Supports sub-nanosecond timing closure in high-speed memory buffers and FPGA I/O expansion paths. |
| 7.5 pF off-state capacitance | Reduces crosstalk and signal degradation in parallel bus architectures with tight trace spacing. |
Applications
| Memory Expansion Interface | FPGA I/O Bridging |
|---|---|
|
Use Scenario: Expanding DRAM address/data bus width between legacy controller and higher-density memory modules. IC Role / Device Role / Timing Role: Bidirectional 24-bit bus switch enabling dynamic reconfiguration of memory access paths without glue logic. Use Value: Eliminates need for discrete transceivers or CPLDs while maintaining <0.3 ns timing skew across all 24 lines. |
Use Scenario: Interfacing heterogeneous I/O standards (LVCMOS, SSTL) between FPGA banks and peripheral ASICs. IC Role / Device Role / Timing Role: Level-agnostic signal router providing configurable connectivity between FPGA I/O banks and external devices. Use Value: Enables pin-multiplexed I/O sharing with 4–7 Ω Ron ensuring <1% signal attenuation at 100 MHz. |
| PCI/PCI-X Slot Multiplexing | Industrial Backplane Switching |
|
Use Scenario: Sharing PCI/PCI-X slots among multiple host processors in modular server blades. IC Role / Device Role / Timing Role: High-bandwidth bidirectional switch isolating or connecting shared bus segments under software control. Use Value: Delivers 5-Ω Ron and 7.5 pF Cio(off) to maintain PCI timing compliance (tSKEO ≤ 1 ns) across hot-plug cycles. |
Use Scenario: Reconfiguring sensor/actuator I/O mappings in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: Ruggedized bus exchanger supporting field-wiring changes without hardware modification. Use Value: −40°C to +85°C rating and 250 mA latch-up immunity ensure reliable operation in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16210ADL | 20-bit version (10-bit exchanger), identical Ron (4–7 Ω), same SSOP-48 package. | Limited to 10-bit data paths; lacks two A/B channel pairs and one select input (S2). | Select when 20-bit width suffices and board space constraints favor smaller 48-pin footprint. |
| SN74CBTD16212DGGR | TSSOP-56 package, 3.3-V optimized (VCC = 2.3–3.6 V), lower Ron (2.5–4 Ω), higher ICC (10 µA). | Designed for 3.3-V systems only; incompatible with 5-V logic without level translation. | Choose for new 3.3-V designs requiring lower on-resistance and better thermal performance (θJA = 64°C/W → 48°C/W). |
Compared with SN74CBT16212ADLR, SN74CBT16210ADL reduces channel count and package size but maintains identical electrical behavior per channel, while SN74CBTD16212DGGR shifts to 3.3-V operation with improved Ron and thermal metrics-neither is pin-compatible, requiring layout revision.
Availability
SN74CBT16212ADLR is available at Aetrix Electronics and suitable for industrial backplane switching, FPGA I/O expansion, memory interface multiplexing, and PCI slot sharing requiring stable component supply across extended product lifecycles.
Supply support for SN74CBT16212ADLR 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 SN74CBT16212ADLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in memory subsystems and FPGA interconnect applications.
FAQ
What is the maximum continuous current per channel for SN74CBT16212ADLR?
The SN74CBT16212ADLR supports up to 128 mA continuous channel current per A/B pair, verified per absolute maximum ratings. This allows safe operation at 64 mA with full 5-Ω on-resistance specification, delivering predictable voltage drop (<320 mV) without thermal derating in standard industrial ambient conditions.
Does SN74CBT16212ADLR require external pull-up or pull-down resistors on control inputs S0–S2?
No, SN74CBT16212ADLR does not require external biasing on S0–S2. Its TTL-compatible inputs have 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 directly via MCU GPIO or fixed rail connections without resistors.
Can SN74CBT16212ADLR operate reliably at 3.3 V supply?
No, SN74CBT16212ADLR is not specified for 3.3 V operation. Its recommended VCC range is 4 V to 5.5 V, and electrical characteristics-including on-resistance, propagation delay, and input thresholds-are guaranteed only within that range. For 3.3-V systems, consider SN74CBTD16212DGGR instead.
How many unique switching configurations does SN74CBT16212ADLR support via S0–S2?
The SN74CBT16212ADLR supports eight distinct switching configurations as defined in its function table, controlled by the 3-bit S0–S2 inputs. These include full disconnect, 12-bit port pass-through (A→B or B→A), 12-bit cross-exchange (A↔B), and four mixed-mode modes where subsets of A/B channels are routed independently.
Is SN74CBT16212ADLR RoHS compliant and lead-free?
Yes, SN74CBT16212ADLR is RoHS compliant with lead-free finish (NIPDAU) and meets JEDEC MSL Level-1 (unlimited floor life at ≤30°C/60% RH). Its SSOP-DL package carries "CBT16212A" top-side marking and is rated for reflow up to 260°C peak temperature per JEDEC J-STD-020.
SN74CBT16212ADLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus FET Exchange Switch
- Circuit:
- 12 x 2:2
- 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
SN74CBT16212ADLR FAQ
1.How can I place an order for SN74CBT16212ADLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16212ADLR 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 SN74CBT16212ADLR reliable?
The price and inventory of SN74CBT16212ADLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16212ADLR is usually 5 days.
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SN74CBT16212ADLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16212ADLR 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 SN74CBT16212ADLR?
For technical support, including SN74CBT16212ADLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16212ADLR requirements.
6.How does Aetrix verify that SN74CBT16212ADLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16212ADLR 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 SN74CBT16212ADLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16212ADLR?
All SN74CBT16212ADLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16212ADLR, 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 SN74CBT16212ADLR part is unused and in its original packaging.
Return procedure for SN74CBT16212ADLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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