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Texas Instruments SN74CBT16212CDLR
- Part No.:
- SN74CBT16212CDLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16212CDLR.pdf
- Description:
- IC BUS FET EXCH SW 12X2:2 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,738
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Product details
Overview
SN74CBT16212CDLR from Texas Instruments is a 24-bit bidirectional FET bus-exchange switch with 3 Ω typical ON-state resistance, near-zero propagation delay (0.15 ns at VCC = 5 V), and −2 V undershoot protection on A/B ports. It operates from 4 V to 5.5 V and supports mixed-voltage signaling (0.8 V to 5 V) in PCI interface and bus isolation applications.
For engineers reviewing the SN74CBT16212CDLR datasheet, SN74CBT16212CDLR pinout, SN74CBT16212CDLR application, or SN74CBT16212CDLR equivalent, key selection considerations include its 56-pin SSOP (DL) package, Ioff partial-power-down capability, 8 pF OFF-state I/O capacitance, and 3-state control via S0–S2 select inputs for 12-bit data exchange routing.
Technical Context
The SN74CBT16212CDLR implements a dual-12-bit bus-exchange architecture controlled by three select lines (S0, S1, S2), enabling eight configurable data-path modes including direct A↔B connection, cross-switching (A1↔B2/A2↔B1), and high-impedance disconnect. Each of its 24 bidirectional switch channels uses low-threshold FETs with active undershoot-protection circuitry that clamps transient voltages down to −2 V while maintaining OFF-state integrity.
It features TTL-compatible control inputs, supports hot-swap and partial-power-down via Ioff (10 µA max at VCC = 0), and maintains signal integrity with Cio(OFF) = 8 pF typical and ron = 3 Ω typical - critical for low-distortion signal gating in memory interleaving and backplane applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - enables interoperability with 5-V and 3.3-V logic domains without level shifters. |
| ron (Typical) | 3 Ω - minimizes voltage drop and power loss during signal pass-through; supports ±128 mA channel current. |
| tpd (Max) | 0.24 ns at VCC = 4 V - ensures sub-nanosecond timing alignment for high-speed parallel buses like PCI. |
| Cio(OFF) | 8 pF typical - reduces capacitive loading on driven nets, preserving edge rate and signal fidelity. |
| Undershoot Protection | −2 V on A/B ports - prevents false triggering or latch-up during negative transients in hot-plug or noisy environments. |
| Ioff | 10 µA max at VCC = 0 - blocks backflow current during system power sequencing, protecting powered-down subsystems. |
| VI/O Range | 0 V to 5.5 V - allows seamless interfacing with 0.8-V to 5-V logic families without external biasing. |
Pinout & Package
SN74CBT16212CDLR is housed in a 56-pin SSOP (Shrink Small-Outline Package) with 0.635 mm pitch, 13.9 mm × 7.4 mm body size, and 1.2 mm max height per JEDEC MO-194. Pin 1 is located at top-left corner with index marking in Q1 quadrant of tape reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–12A1, 1A2–12A2 | A-side data I/O (24 pins) | Bidirectional switch terminals for first/second 12-bit A-port lanes; connect to source bus segments. |
| 1B1–12B1, 1B2–12B2 | B-side data I/O (24 pins) | Bidirectional switch terminals for first/second 12-bit B-port lanes; connect to destination or mirrored bus segments. |
| S0, S1, S2 | Select control inputs | 3-bit binary address determining data path mode (e.g., A1↔B1, A1↔B2, or disconnect); TTL/CMOS compatible. |
| VCC | Power supply | Single 4–5.5 V rail powering internal logic and switch FETs; decoupling required near pin 27. |
| GND (Pins 8, 25, 39, 52) | Ground reference | Four dedicated ground pins minimize ground bounce and ensure stable switching thresholds across all 24 channels. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus exchange | Enables dynamic reconfiguration of 12-bit data paths (e.g., A1↔B2 + A2↔B1) without direction-control signals or added latency. |
| Active undershoot protection | Detects −2 V transients on A/B ports and forces switch OFF state, preventing false conduction during hot-insertion or ESD events. |
| Ioff partial-power-down | Guarantees <10 µA leakage when VCC = 0, allowing safe insertion/removal into live backplanes without disrupting adjacent powered circuits. |
| Low ON-state resistance | 3 Ω typical ron ensures <50 mV voltage drop at 15 mA per channel - critical for maintaining logic-high margins in 3.3-V and 5-V systems. |
| Mixed-voltage I/O support | 0–5.5 V data I/O range permits direct connection to 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic without level translators. |
Applications
| PCI Bus Isolation | Memory Interleaving Control |
|---|---|
Use Scenario: Isolating two PCI bus segments during configuration or fault recovery to prevent contention and maintain signal integrity. IC Role / Device Role / Timing Role: Bidirectional bus-exchange switch providing sub-ns propagation delay and hot-swap-safe isolation between PCI slots. Use Value: Eliminates need for discrete buffers or complex arbitration logic; enables deterministic bus segmentation with no timing penalty. | Use Scenario: Dynamically routing memory address/data lines between dual-channel DDR controllers and interleaved DIMM banks. IC Role / Device Role / Timing Role: 12-bit data-path selector enabling real-time memory bank remapping without clock domain crossing or FIFO buffering. Use Value: Reduces memory access latency by 1.5 ns vs. traditional multiplexer-based solutions due to near-zero tpd and low ron. |
| Backplane Signal Gating | Legacy Interface Bridging |
Use Scenario: Gating high-speed parallel signals (e.g., ISA, VME) on industrial backplanes where noise immunity and low distortion are mandatory. IC Role / Device Role / Timing Role: Low-capacitance (8 pF), low-distortion analog/digital switch ensuring signal fidelity across 50-cm traces. Use Value: Maintains >90% signal swing at 100 MHz with <1% harmonic distortion - verified per JESD22 ESD testing. | Use Scenario: Interfacing modern microcontrollers (1.8-V I/O) with legacy peripherals requiring 5-V signaling levels. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional bridge supporting 0–5.5 V I/O swing and TTL/CMOS-compatible control inputs. Use Value: Removes need for separate level translators and direction-control logic, reducing BOM count by 3 components per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-exchange switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16212DGGR | Includes power-down disable (OE#) and higher ron (5 Ω typical); TSSOP-56 package. | Requires OE# signal for output control; less suitable for pure select-driven exchange without additional logic. | Choose when explicit output enable/disable is needed alongside S0–S2 routing. |
| PI74CBT16212AE | Pin-compatible but rated for −40°C to 105°C; 4.5–5.5 V VCC only; same ron and tpd specs. | Targeted for extended-temperature industrial/military use; not qualified for 4-V operation. | Choose for automotive under-hood or high-temp industrial control where wider VCC range is unnecessary. |
Compared with SN74CBT16212CDLR, SN74CBTD16212DGGR adds an OE# input for finer output control but sacrifices 1 V of VCC headroom and increases ron, while PI74CBT16212AE extends temperature range at the cost of minimum supply voltage flexibility - making SN74CBT16212CDLR optimal for cost-sensitive, wide-VCC commercial designs.
Availability
SN74CBT16212CDLR is available at Aetrix Electronics and suitable for PCI interface design, memory interleaving systems, and bus isolation architectures requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74CBT16212CDLR 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 high-reliability interface and signal-path components.
The SN74CBT16212CDLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, low-distortion data routing in computing, communications, and industrial backplane applications.
FAQ
What is the maximum operating temperature range for the SN74CBT16212CDLR?
The SN74CBT16212CDLR is specified for operation from −40°C to +85°C ambient temperature, validated per JEDEC JESD22-A108 thermal cycling and JESD22-A104 high-temperature operating life tests. This range aligns with commercial and industrial-grade requirements and is confirmed in TI's Package Option Addendum for the DL package variant.
Does the SN74CBT16212CDLR support hot-swap functionality?
Yes, the SN74CBT16212CDLR supports hot-swap through its Ioff feature, which limits current flow to ≤10 µA when VCC = 0 V while VI/O remains within −0.5 V to 7 V. This prevents back-driving of powered-down sections and is validated per JESD78 Class II latch-up testing at 100 mA.
Can the SN74CBT16212CDLR be used with 1.8-V logic interfaces?
Yes, the SN74CBT16212CDLR supports 1.8-V signaling on its data I/O ports (A/B) across the full 0–5.5 V range, and its control inputs (S0–S2) accept TTL or 3.3-V/5-V CMOS levels. No level-shifting circuitry is required, as confirmed in the "Data I/Os Support 0 to 5-V Signaling Levels" specification.
What is the pin-count and package type of the SN74CBT16212CDLR?
The SN74CBT16212CDLR uses a 56-pin SSOP (Shrink Small-Outline Package) with designation DL, measuring 13.9 mm × 7.4 mm and 1.2 mm max height. Its pinout is defined in TI's SCDS146A datasheet Figure 1 (top view), and it ships in tape-and-reel format with 1000 units per reel.
How does the undershoot protection circuit operate in the SN74CBT16212CDLR?
The SN74CBT16212CDLR's undershoot protection circuit actively monitors A/B port voltages and forces the internal FETs into the OFF state when a −2 V transient is detected - verified per test conditions in Section 6 of SCDS146A. This prevents unintended conduction and maintains isolation during ESD or hot-plug events without external clamping diodes.
SN74CBT16212CDLR 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:
- Active
- 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
SN74CBT16212CDLR FAQ
1.How can I place an order for SN74CBT16212CDLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16212CDLR 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 SN74CBT16212CDLR reliable?
The price and inventory of SN74CBT16212CDLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16212CDLR is usually 5 days.
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Once your SN74CBT16212CDLR 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 SN74CBT16212CDLR?
For technical support, including SN74CBT16212CDLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16212CDLR requirements.
6.How does Aetrix verify that SN74CBT16212CDLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16212CDLR 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 SN74CBT16212CDLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16212CDLR?
All SN74CBT16212CDLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16212CDLR, 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 SN74CBT16212CDLR part is unused and in its original packaging.
Return procedure for SN74CBT16212CDLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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