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Texas Instruments SN74CBTD16211DLG4
- Part No.:
- SN74CBTD16211DLG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBTD16211DLG4.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,710
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Product details
Overview
SN74CBTD16211DLG4 from Texas Instruments is a 24-bit FET bus switch with integrated level shifting, designed for bidirectional 5-V-to-3.3-V signal translation between TTL-compatible buses. It features dual 12-bit independent channels, 5-Ω on-state resistance, sub-nanosecond propagation delay (0.25 ns), and operates across –40°C to 85°C. It serves in high-speed memory/data bus isolation and mixed-voltage system interconnects.
For engineers reviewing the SN74CBTD16211DLG4 datasheet, SN74CBTD16211DLG4 pinout, SN74CBTD16211DLG4 application, or SN74CBTD16211DLG4 equivalent, key selection criteria include its dual-channel OE control, guaranteed 5-Ω ron at 4.5 V, level-shifting diode integration, and SSOP-56 package compatibility with legacy Widebus™ layouts.
Technical Context
The SN74CBTD16211DLG4 implements a passive FET-based bus switch architecture with no internal logic-signal path conduction is purely analog and bidirectional. Each 12-bit channel uses separate OE inputs to enable/disable A↔B connectivity, supporting either two independent 12-bit switches or one consolidated 24-bit switch.
Level shifting is achieved via integrated input diodes to VCC, enabling safe translation of 5-V inputs to 3.3-V outputs without external components. The device requires no power sequencing and maintains high-impedance isolation when OE is high, with typical off-capacitance of 5.5 pF per I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V - ensures minimal voltage drop and signal integrity for ≤128 mA channel current. |
| Propagation delay (tpd) | 0.25 ns max - enables operation in high-speed parallel bus systems up to >1 GHz effective data rates. |
| Supply voltage range | 4.5 V to 5.5 V - compatible with standard 5-V logic rails while supporting 3.3-V output level shifting. |
| Input voltage range | –0.5 V to 7 V - accommodates overvoltage transients and mixed-supply interface conditions. |
| Channel count & configuration | Dual 12-bit independent buses - allows flexible partitioning for isolated subsystem communication or consolidated 24-bit data paths. |
| Off-state capacitance (Cio(OFF)) | 5.5 pF - minimizes capacitive loading and crosstalk during disabled states in dense PCB layouts. |
| Operating temperature | –40°C to 85°C - qualified for industrial-grade embedded and communications equipment environments. |
Pinout & Package
SN74CBTD16211DLG4 is housed in a 56-pin SSOP (Shrink Small-Outline Package) with 0.635 mm pitch, JEDEC MO-118 compliant, body dimensions 13.9 mm × 6.2 mm × 2.4 mm (L × W × H), and moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | Input/Output Port A terminals | Bidirectional signal pins for first and second 12-bit bus segments; connected to B-side when respective OE is low. |
| 1B1–1B12, 2B1–2B12 | Input/Output Port B terminals | Corresponding bidirectional signal pins for mirrored bus segments; electrically identical to A-side under enabled condition. |
| 1OE, 2OE | Channel enable inputs | Active-low controls: drives associated 12-bit switch ON (A↔B connected) when low; high-impedance isolation when high. |
| VCC | Power supply | 5-V supply rail powering internal level-shifting diodes and switch bias; must be stable within 4.5–5.5 V. |
| GND | Ground reference | Common return for all signal and power paths; multiple GND pins reduce ground bounce in high-speed switching. |
| NC | No internal connection | Unbonded pins (pins 1 and 56); must remain unconnected to avoid mechanical stress or unintended coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated level-shifting diodes | Enables direct 5-V-to-3.3-V translation without external resistors or translators-reduces BOM count and layout area. |
| Dual independent OE control | Allows asynchronous enable/disable of each 12-bit channel-supports staggered bus arbitration or partial subsystem power gating. |
| 5-Ω low on-resistance | Maintains signal rise/fall times and reduces insertion loss in high-frequency parallel buses (e.g., memory address/data lines). |
| TTL-compatible input thresholds | VIH = 2 V min / VIL = 0.8 V max ensures reliable interfacing with legacy 5-V TTL and CMOS drivers without level conversion. |
| High off-isolation (>50 dB typical) | 5.5 pF Cio(OFF) and >10⁹ Ω off-resistance minimize crosstalk and leakage between inactive bus segments. |
Applications
| Memory Subsystem Isolation | PCI/ISA Bus Interface |
|---|---|
Use Scenario: Isolating 5-V legacy memory controllers from 3.3-V SDRAM modules in industrial computing platforms. IC Role / Device Role / Timing Role: Bidirectional level-shifting bus switch enabling clean voltage domain crossing without timing skew or signal degradation. Use Value: Eliminates need for discrete level translators and pull-up networks-reducing component count by ≥4 parts per channel and preserving <0.25 ns propagation delay. | Use Scenario: Interfacing 5-V PCI add-in cards with 3.3-V host bridge logic in embedded instrumentation systems. IC Role / Device Role / Timing Role: Dual-channel bus switch providing independent enable control for address and data lanes during hot-plug arbitration. Use Value: Supports simultaneous 24-bit data transfer with guaranteed 5-Ω ron, preventing bus contention and ensuring signal integrity at 33 MHz PCI clock rates. |
| Backplane Signal Routing | Mixed-Voltage FPGA I/O Expansion |
Use Scenario: Routing parallel control signals between 5-V microcontroller backplanes and 3.3-V peripheral modules in telecom line cards. IC Role / Device Role / Timing Role: High-impedance isolation switch activated only during valid data windows-suppressing noise coupling across shared backplane traces. Use Value: Achieves >50 dB off-isolation and <5.5 pF off-capacitance, reducing crosstalk-induced bit errors in multi-drop configurations. | Use Scenario: Expanding FPGA I/O banks to drive both 5-V sensors and 3.3-V ADCs in programmable logic controllers. IC Role / Device Role / Timing Role: Configurable 12-bit or 24-bit switch enabling dynamic reassignment of voltage-domain interfaces via FPGA-controlled OE signals. Use Value: Enables single-FPGA design reuse across multiple sensor suites-cutting development time by eliminating custom level-shifter PCB variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16211DGVR | TVSOP-56 package; 48°C/W θJA; same electrical specs and pinout. | Lower thermal resistance supports higher ambient temperatures in compact enclosures. | Preferred for space-constrained designs requiring improved thermal performance without layout changes. |
| SN74CBTD16210DLG4 | 20-bit version (dual 10-bit); identical SSOP-56 footprint but fewer I/Os and different pin mapping. | Lacks two bits per channel-unsuitable for full 24-bit data paths but saves cost where bandwidth is reduced. | Select only when 20-bit bus width suffices and pin compatibility is verified against existing layout. |
Compared with SN74CBTD16211DLG4, SN74CBT16211DGVR offers better thermal dissipation in smaller form factor, while SN74CBTD16210DLG4 trades I/O count for cost reduction-neither is pin-compatible replacement, requiring layout review for migration.
Availability
SN74CBTD16211DLG4 is available at Aetrix Electronics and suitable for industrial computing, telecom backplane interconnect, and mixed-voltage FPGA expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74CBTD16211DLG4 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 expertise in high-speed interface ICs and industrial-grade reliability.
The SN74CBTD16211DLG4 belongs to TI's Widebus™ family of bus switches, engineered specifically for low-latency, low-distortion signal routing in mixed-voltage digital systems-targeting memory, backplane, and legacy interface modernization.
FAQ
What is the maximum continuous current rating per channel for SN74CBTD16211DLG4?
The SN74CBTD16211DLG4 supports a continuous channel current of 128 mA per switch path. This rating is specified under absolute maximum conditions and assumes proper thermal management-actual usable current depends on board layout, ambient temperature, and duty cycle. For sustained 128 mA operation, ensure junction temperature remains below 150°C using the DL package's 56°C/W θJA.
Does SN74CBTD16211DLG4 require external pull-up or pull-down resistors on its control inputs?
No, SN74CBTD16211DLG4 does not require external pull-up or pull-down resistors on OE inputs. However, TI mandates that all unused control inputs be held at VCC or GND to prevent floating states that could cause erratic switching or increased ICC. This requirement is explicitly stated in the recommended operating conditions section of the datasheet.
Can SN74CBTD16211DLG4 translate signals from 3.3 V to 5 V?
No, SN74CBTD16211DLG4 is designed exclusively for 5-V-to-3.3-V level shifting. Its internal diode-to-VCC architecture clamps inputs above VCC but does not boost or translate low-voltage inputs upward. Attempting 3.3-V-to-5-V translation will result in degraded VOH and potential signal integrity failure-use a dedicated translator like TXB0108 for bidirectional level shifting.
What is the significance of the "G4" suffix in SN74CBTD16211DLG4?
"G4" denotes TI's green packaging standard: lead-free (RoHS-compliant), bromine- and antimony-free, with NiPdAu (NIPDAU) lead finish. It confirms compliance with JEDEC Level-1 moisture sensitivity and 260°C peak reflow profile. The "G4" suffix does not affect electrical performance-it is an environmental and assembly specification aligned with modern manufacturing requirements.
How does SN74CBTD16211DLG4 handle fast edge-rate signals in high-frequency applications?
SN74CBTD16211DLG4 maintains signal fidelity for fast edges via its 5-Ω ron and <5.5 pF off-capacitance, minimizing RC delay and reflections. However, the datasheet cautions that level-shifting effectiveness diminishes at very high frequencies due to parasitic effects-designers should verify performance empirically at target data rates and consider controlled-impedance routing and termination for >100 MHz operation.
SN74CBTD16211DLG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTD
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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-SSOP
SN74CBTD16211DLG4 FAQ
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6.How does Aetrix verify that SN74CBTD16211DLG4 is sourced from the original manufacturer or authorized distributors?
All SN74CBTD16211DLG4 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 SN74CBTD16211DLG4 meets industry standards.
7.What is the process for return or replacement of SN74CBTD16211DLG4?
All SN74CBTD16211DLG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTD16211DLG4, 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 SN74CBTD16211DLG4 part is unused and in its original packaging.
Return procedure for SN74CBTD16211DLG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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