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Texas Instruments SN74CBT16245DGGR
- Part No.:
- SN74CBT16245DGGR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74CBT16245DGGR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:344
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Product details
Overview
SN74CBT16245DGGR from Texas Instruments is a 16-bit FET bus switch organized as two independent 8-bit bidirectional switches, featuring 5-Ω typical on-state resistance, TTL-compatible control inputs (VIH = 2 V, VIL = 0.8 V), and operation across –40°C to 85°C. It enables low-latency, high-isolation data routing in memory expansion and backplane interconnect applications.
For engineers reviewing the SN74CBT16245DGGR datasheet, SN74CBT16245DGGR pinout, SN74CBT16245DGGR application, or SN74CBT16245DGGR equivalent, key selection criteria include bidirectional switching latency (tpd ≤ 0.35 ns at VCC = 4 V), thermal performance (θJA = 70°C/W), and TSSOP-48 package compatibility with high-density PCB layouts.
Technical Context
The SN74CBT16245DGGR implements dual 8-bit FET-based transmission gates controlled by separate OE inputs, supporting true bidirectional signal flow without direction pins. Its low on-resistance (5–7 Ω) and minimal charge injection ensure sub-nanosecond propagation delay and negligible signal distortion.
Each switch operates under TTL-level logic control with latch-up immunity >100 mA per JESD 78 Class II and ESD protection exceeding 2000-V HBM. The device requires no biasing or termination and maintains high-impedance isolation (>10⁹ Ω) when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω typical - ensures minimal voltage drop and signal attenuation during active switching. |
| Propagation delay (tpd) | 0.35 ns max at VCC = 4 V - enables high-speed bus toggling up to ~1 GHz effective bandwidth. |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage system interfaces. |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable recognition of standard TTL logic levels. |
| Thermal resistance (θJA) | 70°C/W for TSSOP-48 - defines maximum power dissipation (≤71 mW at 50°C ambient rise) under natural convection. |
| ESD rating (HBM) | 2000 V - exceeds JEDEC JESD22-A114A, reducing risk of handling damage in assembly. |
| Latch-up immunity | >100 mA per JESD 78 Class II - prevents destructive latch-up during transient overvoltage events. |
Pinout & Package
TSSOP-48 (DGG) package: 12.6 mm × 6.2 mm × 1.2 mm body, 0.5-mm lead pitch, gull-wing leads, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable controls | Low-active enables corresponding 8-bit switch; high disables both A↔B paths into high-Z state. |
| 1A1–1A8, 2A1–2A8 | Port A terminals (first/second 8-bit group) | Input/output nodes for one side of each 8-bit bidirectional switch; electrically identical to B-side. |
| 1B1–1B8, 2B1–2B8 | Port B terminals (first/second 8-bit group) | Input/output nodes for opposite side; fully interchangeable with A-side under OE control. |
| VCC (pins 7, 18, 29, 40) | Power supply | Single 4–5.5 V rail powers all 16 switches; four distributed pins reduce IR drop and noise coupling. |
| GND (pins 4, 11, 22, 33, 44) | Ground reference | Five ground pins provide low-inductance return path and improve signal integrity across full 16-bit width. |
| NC (pins 1, 24, 25, 48) | No internal connection | Unbonded pads; must remain unconnected to avoid mechanical stress or unintended parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 16-bit bus switching | Two independent 8-bit channels allow simultaneous, isolated data routing between A/B ports without direction control logic. |
| Ultra-low on-resistance | 5–7 Ω typical minimizes insertion loss and preserves signal edge rate in high-speed parallel buses. |
| TTL-compatible control interface | VIH = 2 V / VIL = 0.8 V eliminates need for level shifters when interfacing with legacy 5-V microcontrollers or FPGAs. |
| High off-isolation | Off-state capacitance Cio(OFF) = 4.5 pF ensures minimal crosstalk and signal bleed between enabled/disabled channels. |
| Robust process reliability | Latch-up immunity >100 mA and 2000-V HBM ESD rating support industrial-grade board handling and long-term field operation. |
Applications
| Memory Expansion Interface | Backplane Data Routing |
|---|---|
|
Use Scenario: Expanding address/data bus width between microcontroller and external SRAM or Flash memory. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating memory subsystem during CPU idle cycles while enabling fast read/write bursts. Use Value: 0.35 ns tpd and 5-Ω ron preserve setup/hold timing margins and minimize bus skew across 16-bit paths. |
Use Scenario: Dynamic reconfiguration of signal paths between multiple processor modules on a shared backplane. IC Role / Device Role / Timing Role: Low-latency, high-isolation switch enabling hot-swap-capable module interconnect without bus contention. Use Value: Independent OE control per 8-bit bank allows selective channel enablement, reducing power and noise during partial reconfiguration. |
| Legacy Peripheral Bridging | FPGA I/O Expansion |
|
Use Scenario: Interfacing modern FPGA I/O banks with older 5-V TTL peripherals (e.g., UARTs, parallel ADCs). IC Role / Device Role / Timing Role: Level-agnostic bidirectional buffer translating between 3.3-V FPGA outputs and 5-V peripheral inputs/outputs. Use Value: TTL-compatible VIH/VIL thresholds eliminate external pull-ups or level translators, simplifying BOM and layout. |
Use Scenario: Extending limited FPGA GPIO count to drive multiple 16-bit parallel devices (e.g., LCD controllers, sensor arrays). IC Role / Device Role / Timing Role: High-bandwidth, low-skew bus repeater distributing FPGA outputs to multiple downstream loads. Use Value: 4.5 pF off-capacitance and 70°C/W θJA support stable operation in thermally constrained FPGA carrier boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245DGGR | Includes series resistors (26 Ω) on all I/O pins for improved EMI suppression and reduced ringing. | Better suited for noisy industrial environments or long trace routing where signal integrity is critical. | Select SN74CBTD16245DGGR when board-level filtering is impractical and controlled slew is required. |
| 74ALVC16245PW,118 | Lower VCC range (1.65–3.6 V), CMOS input thresholds, higher ICC (max 40 µA), and 12-Ω ron. | Targeted at 3.3-V or mixed-voltage systems; not TTL-compatible and unsuitable for 5-V legacy interfaces. | Choose 74ALVC16245PW,118 only for new 3.3-V designs requiring lower power and smaller footprint (TSSOP-48 same size). |
Compared with SN74CBT16245DGGR, SN74CBTD16245DGGR adds integrated termination for robustness in electrically harsh settings, while 74ALVC16245PW,118 trades TTL compatibility and low ron for lower voltage operation and reduced static current-neither is pin-compatible, requiring layout revision.
Availability
SN74CBT16245DGGR is available at Aetrix Electronics and suitable for memory expansion interfaces, backplane data routing, legacy peripheral bridging, and FPGA I/O expansion requiring stable component supply and long-lifecycle support.
Supply support for SN74CBT16245DGGR 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 SN74CBT16245DGGR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in 5-V TTL-based computing and instrumentation systems.
FAQ
What is the maximum operating temperature range for the SN74CBT16245DGGR?
The SN74CBT16245DGGR is rated for operation from –40°C to +85°C ambient temperature, validated per TI's recommended operating conditions. This range supports deployment in industrial control panels, telecom line cards, and automotive under-hood auxiliary modules where thermal cycling and extended temperature stability are required. The SN74CBT16245DGGR maintains specified on-resistance and timing parameters across this full range.
Does the SN74CBT16245DGGR require external pull-up or pull-down resistors on its control inputs?
No, the SN74CBT16245DGGR does not require external pull-up or pull-down resistors on its OE inputs. Its TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) allow direct connection to standard 5-V logic outputs. However, TI recommends tying unused control inputs to VCC or GND to prevent floating states that could increase ICC or cause undefined switching behavior - a requirement explicitly stated in the SN74CBT16245DGGR datasheet.
Can the SN74CBT16245DGGR be used in bidirectional 3.3-V systems?
The SN74CBT16245DGGR is not recommended for standalone 3.3-V bidirectional operation. Its minimum VCC is 4 V, and its VIH/VIL thresholds are optimized for 5-V TTL signaling. While it may function at 3.3 V with degraded noise margin and increased ron, TI specifies operation only from 4 V to 5.5 V. For 3.3-V systems, consider alternatives like the 74ALVC16245 - the SN74CBT16245DGGR is engineered for 5-V legacy compatibility.
What is the thermal performance of the SN74CBT16245DGGR in its TSSOP-48 package?
The SN74CBT16245DGGR in TSSOP-48 (DGG) has a junction-to-ambient thermal resistance (θJA) of 70°C/W under standard JEDEC test conditions. At maximum continuous channel current (128 mA per switch, worst-case 16-bit load), total power dissipation remains below 71 mW, resulting in a junction temperature rise of ~5°C above ambient - well within safe limits for industrial PCB layouts without forced airflow. This θJA value is confirmed in the SN74CBT16245DGGR absolute maximum ratings table.
Is the SN74CBT16245DGGR pin-compatible with the SN74LS16245 or SN74ALS16245?
Yes, the SN74CBT16245DGGR uses the standard '16245-type pinout as stated in its datasheet, making it mechanically and electrically pin-compatible with SN74LS16245 and SN74ALS16245 in TSSOP-48 footprint. However, unlike those bipolar predecessors, the SN74CBT16245DGGR offers FET-based switching with lower power, faster speed, and higher off-isolation - enabling direct replacement in existing designs without PCB changes, provided VCC remains ≥4 V.
SN74CBT16245DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
SN74CBT16245DGGR FAQ
1.How can I place an order for SN74CBT16245DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16245DGGR 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 SN74CBT16245DGGR reliable?
The price and inventory of SN74CBT16245DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16245DGGR is usually 5 days.
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SN74CBT16245DGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16245DGGR 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 SN74CBT16245DGGR?
For technical support, including SN74CBT16245DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16245DGGR requirements.
6.How does Aetrix verify that SN74CBT16245DGGR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16245DGGR 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 SN74CBT16245DGGR meets industry standards.
7.What is the process for return or replacement of SN74CBT16245DGGR?
All SN74CBT16245DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16245DGGR, 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 SN74CBT16245DGGR part is unused and in its original packaging.
Return procedure for SN74CBT16245DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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