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Texas Instruments SN74CBT16211AZQLR
- Part No.:
- SN74CBT16211AZQLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-VFBGA
- Datasheet:
-
SN74CBT16211AZQLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,398
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Product details
Overview
SN74CBT16211AZQLR from Texas Instruments is a 24-bit high-speed TTL-compatible bus switch IC with dual 12-bit configurable operation, 5-Ω typical on-state resistance, <0.25 ns propagation delay at 5 V, and operation across −40°C to 85°C. It enables low-latency bidirectional signal routing in memory expansion, FPGA I/O bridging, and hot-swap backplane interfaces.
For engineers reviewing the SN74CBT16211AZQLR datasheet, SN74CBT16211AZQLR pinout, SN74CBT16211AZQLR application, or SN74CBT16211AZQLR equivalent, key selection criteria include its 56-pin VFBGA (ZQL) package, dual independent enable control (1OE/2OE), rail-to-rail analog switching capability, and compatibility with 3.3 V/5 V mixed-voltage systems.
Technical Context
The SN74CBT16211AZQLR implements two independent 12-bit FET-based transmission gate arrays, each controlled by dedicated OE inputs (1OE, 2OE), allowing selective activation of either 12-bit port or both simultaneously. Its TTL-compatible control inputs accept VIH ≥ 2 V and VIL ≤ 0.8 V under 4–5.5 V VCC.
Each switch channel exhibits symmetrical bidirectional conduction with no directionality constraint, supports up to ±128 mA continuous current per channel, and maintains sub-7 Ω on-resistance across full operating temperature and voltage range - enabling minimal signal distortion for data rates up to 100+ MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - supports direct interface with 3.3 V logic systems using level-shifting design margin |
| ron (Typ) | 5 Ω - ensures <50 mV voltage drop at 64 mA, preserving signal integrity in high-speed digital buses |
| tpd (Max) | 0.35 ns at 4 V - enables sub-nanosecond timing budgets for DDR memory buffers and FPGA interconnects |
| ten / tdis | 3.3 ns / 2.8 ns at 5 V - guarantees fast enable/disable transitions critical for dynamic bus arbitration |
| ICC (Max) | 3 µA - ultra-low static power ideal for always-on system management and standby-mode isolation |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded control and telecom infrastructure applications |
| Input Clamping | VIK = −1.2 V - protects against negative transients during hot-insertion or bus contention events |
Pinout & Package
VFBGA package (ZQL), 56-pin, 5.5 mm × 5.5 mm, 0.5 mm pitch, bottom-side solder balls, Pb-free finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Port A input/output terminals | Bidirectional analog/digital signal paths for first and second 12-bit buses; no internal direction control |
| 1B1–1B12, 2B1–2B12 | Port B input/output terminals | Corresponding switched endpoints for each A-port; fully symmetrical with A-side |
| 1OE, 2OE | Independent enable inputs | Active-low controls: drives respective 12-bit switch array into low-Z state when pulled low |
| VCC | Power supply | Single 4–5.5 V supply powers all switches and control logic; no separate I/O supply required |
| GND (×4) | Ground terminals | Dedicated ground balls minimize switching noise coupling and improve return path integrity |
| NC (×2) | No-connect terminals | Unbonded pads; must be left unconnected per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| 56-pin VFBGA (ZQL) footprint | Enables ultra-dense PCB layouts in space-constrained modules like COM Express carriers and compact FPGA mezzanines |
| Dual independent 12-bit switching | Allows simultaneous or staggered bus isolation - e.g., isolate CPU address bus while keeping data bus active |
| TTL-compatible control inputs | Eliminates need for level translators when driven by legacy 5 V microcontrollers or CPLDs |
| Rail-to-rail analog switching | Supports DC-coupled signals from GND to VCC without clipping - usable in mixed-signal test instrumentation |
| Low 5 Ω on-resistance | Reduces insertion loss and reflection in high-frequency digital traces, improving eye diagram margins |
Applications
| Memory Expansion Interface | FPGA I/O Bridging |
|---|---|
Use Scenario: Expanding DRAM capacity on a microcontroller-based industrial controller board with limited address/data pins. IC Role / Device Role / Timing Role: Bidirectional 24-bit bus switch isolating main MCU bus from secondary memory bank; enables time-multiplexed access without bus contention. Use Value: Eliminates need for complex address latching logic and reduces PCB layer count by avoiding dedicated memory controller ASIC. |
Use Scenario: Interfacing heterogeneous FPGA I/O banks (1.8 V, 3.3 V) to a common peripheral bus in an adaptive radio platform. IC Role / Device Role / Timing Role: Voltage-agnostic signal router between FPGA I/O and multi-supply peripherals; preserves signal rise/fall times via low-ron path. Use Value: Avoids level-shifter ICs and associated propagation delays, maintaining setup/hold timing margins for 100 MHz SPI and parallel GPIO. |
| Hot-Swap Backplane Isolation | Test Access Multiplexer |
Use Scenario: Safely inserting/removing line cards in a modular telecom chassis while main backplane remains powered. IC Role / Device Role / Timing Role: High-speed isolation barrier between card-edge connector and backplane bus; enabled only after power sequencing completes. Use Value: Prevents bus glitches and latch-up during insertion; supports <100 ms enable latency without disrupting system clock domain. |
Use Scenario: Sharing a single JTAG debugger across multiple SoC test points on a multi-processor evaluation board. IC Role / Device Role / Timing Role: Low-capacitance (5.5 pF off-state) multiplexer selecting one of four JTAG chains to upstream debug header. Use Value: Maintains JTAG signal integrity at 25 MHz TCK; eliminates manual jumper changes and reduces test setup time by 70%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16211DGVR | Includes bus-hold circuitry and higher 12 Ω ron; TVSOP-56 package | Designed for floating-bus stabilization in un-driven states; less suitable for high-speed analog routing | Prefer when input pins may be left unconnected during power-up or partial system reset |
| SN74LVC16244ADGGR | 3.3 V-only buffer with 3-state outputs; 48-pin TSSOP; no analog switching capability | Provides direction-controlled buffering, not bidirectional pass-through; requires external direction control logic | Select only if strict unidirectional data flow and lower drive strength (24 mA) are acceptable trade-offs |
Compared with SN74CBT16211AZQLR, SN74CBTD16211DGVR adds bus-hold but sacrifices speed and analog fidelity, while SN74LVC16244ADGGR offers logic-level translation but lacks true bidirectional transparency and introduces direction-control overhead.
Availability
SN74CBT16211AZQLR is available at Aetrix Electronics and suitable for industrial automation controllers, FPGA carrier boards, and telecom line-card designs requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for SN74CBT16211AZQLR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBT16211AZQLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in mixed-voltage digital systems where timing predictability and signal fidelity are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT16211AZQLR?
The SN74CBT16211AZQLR supports up to 128 mA continuous channel current per switch path, verified across the full −40°C to +85°C operating range. This rating ensures reliable conduction without thermal derating in typical 50 Ω-terminated digital bus environments. Exceeding this value risks parametric shift or long-term reliability degradation.
Does the SN74CBT16211AZQLR require external pull-up or pull-down resistors on its OE inputs?
No - the SN74CBT16211AZQLR OE inputs are TTL-compatible and internally biased to recognize VIH ≥ 2 V and VIL ≤ 0.8 V directly. However, TI recommends tying unused OE inputs to VCC or GND to prevent floating states that could cause unintended switching. External resistors are unnecessary unless interfacing with open-drain drivers.
Can the SN74CBT16211AZQLR be used to switch analog signals such as audio or sensor outputs?
Yes - the SN74CBT16211AZQLR is a bidirectional analog switch with rail-to-rail signal handling (GND to VCC) and 5 Ω on-resistance, making it suitable for DC-coupled analog signals up to ~100 MHz bandwidth. Its low charge injection (<10 pC) and flat ron vs. voltage profile preserve signal linearity in precision applications like thermocouple multiplexing.
What is the thermal resistance (θJA) of the SN74CBT16211AZQLR in its ZQL package?
The SN74CBT16211AZQLR in the VFBGA ZQL package has a specified junction-to-ambient thermal resistance (θJA) of 42°C/W under JEDEC-standard PCB mounting conditions. This value assumes a 2-layer board with 1-in² copper pour and is critical for calculating maximum allowable power dissipation in thermally constrained enclosures.
Is the SN74CBT16211AZQLR pin-compatible with other members of the CBT16211 family?
Yes - the SN74CBT16211AZQLR shares identical pinout and functional mapping with SN74CBT16211ADGVR, SN74CBT16211ADL, and SN74CBT16211AGQLR. All variants use the same 56-pin topology and terminal assignments, though mechanical dimensions and solder-ball layout differ between ZQL, DGV, DL, and GQL packages.
SN74CBT16211AZQLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 56-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 12 x 1:1
- Independent Circuits:
- 2
- 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-BGA Microstar Junior (7x4.5)
SN74CBT16211AZQLR FAQ
1.How can I place an order for SN74CBT16211AZQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16211AZQLR 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 SN74CBT16211AZQLR reliable?
The price and inventory of SN74CBT16211AZQLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16211AZQLR is usually 5 days.
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Once your SN74CBT16211AZQLR 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 SN74CBT16211AZQLR?
For technical support, including SN74CBT16211AZQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16211AZQLR requirements.
6.How does Aetrix verify that SN74CBT16211AZQLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16211AZQLR 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 SN74CBT16211AZQLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16211AZQLR?
All SN74CBT16211AZQLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16211AZQLR, 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 SN74CBT16211AZQLR part is unused and in its original packaging.
Return procedure for SN74CBT16211AZQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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