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Texas Instruments SN74CBT16245DGVR
- Part No.:
- SN74CBT16245DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT16245DGVR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,051
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Product details
Overview
SN74CBT16245DGVR 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-propagation-delay data routing in memory expansion and processor interconnect applications.
For engineers reviewing the SN74CBT16245DGVR datasheet, SN74CBT16245DGVR pinout, SN74CBT16245DGVR application, or SN74CBT16245DGVR equivalent, key selection criteria include its 48-pin TVSOP package, dual OE control, bidirectional signal flow with high-impedance isolation, and compliance with JESD 78 Class II latch-up and JESD 22 ESD standards.
Technical Context
The SN74CBT16245DGVR implements two independent 8-bit FET-based transmission gates, each controlled by a dedicated OE input. Its switch architecture provides symmetrical A↔B conduction with no directionality-data flows bidirectionally when enabled and presents >10⁹ Ω isolation when disabled.
It operates at VCC = 4–5.5 V with sub-nanosecond propagation delay (tpd = 0.25 ns at VCC = 5 V), driven by low on-resistance (ron = 5–7 Ω) and minimal parasitic capacitance (Cio(OFF) = 4.5 pF). Input clamp voltage (VIK = –1.2 V) and ±1 µA input leakage ensure robust interface compatibility with TTL and CMOS logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - Supports standard 5-V TTL systems without level-shifting. |
| ron (Typ) | 5 Ω - Enables <100 ps RC delay into 50-pF loads, preserving signal integrity in high-speed buses. |
| tpd (Max) | 0.35 ns at VCC = 4 V - Delivers near-instantaneous switching for memory address/data multiplexing. |
| VIH / VIL | 2 V / 0.8 V - Fully compatible with legacy TTL output thresholds without pull-up resistors. |
| ESD Rating | 2000-V HBM - Ensures handling robustness during board assembly and system integration. |
| Latch-Up Immunity | >100 mA per JESD 78 Class II - Guarantees fault tolerance under transient overvoltage conditions. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded and computing environments. |
Pinout & Package
SN74CBT16245DGVR uses a 48-pin Thin Very Small Outline Package (TVSOP, DGV), 7.9 mm × 4.4 mm body, 0.4 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent Output Enable | Active-low control for each 8-bit switch bank; enables true bidirectional isolation per segment. |
| 1A1–1A8, 2A1–2A8 | Port A Terminals | First and second 8-bit input/output ports; electrically identical to B-side terminals. |
| 1B1–1B8, 2B1–2B8 | Port B Terminals | Second set of 8-bit I/O ports; fully interchangeable with A-side for flexible routing. |
| VCC (Pins 7, 18, 29, 40) | Power Supply | Four distributed VCC pins minimize IR drop and improve noise immunity across wide bus traces. |
| GND (Pins 4, 15, 26, 37) | Ground Reference | Four dedicated GND pins provide low-inductance return paths for all 16 switch channels. |
| NC (Pins 1, 48) | No Internal Connection | Unbonded pads; must remain unconnected to avoid mechanical stress or solder wicking. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω On-State Resistance | Minimizes voltage drop and timing skew across 16-bit parallel paths, critical for synchronous bus timing budgets. |
| Standard '16245 Pinout | Enables drop-in replacement of legacy 74-series bus transceivers without PCB redesign. |
| Dual Independent OE Inputs | Allows selective enabling of upper/lower 8-bit segments-supports partial bus gating and power-aware data routing. |
| TTL-Compatible Control | Eliminates need for external level shifters when interfacing with microcontroller GPIO or FPGA I/O banks. |
| High-Speed Propagation Delay | 0.25 ns typical tpd supports >1 GHz effective toggle rates in point-to-point or stub-limited topologies. |
Applications
| Memory Expansion Interface | Processor Bus Multiplexing |
|---|---|
|
Use Scenario: Expanding address/data bus width between a microcontroller and external SRAM or Flash memory. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating memory segments during idle cycles and enabling concurrent access arbitration. Use Value: Eliminates bus contention while maintaining sub-ns timing alignment-critical for 50+ MHz parallel memory interfaces. |
Use Scenario: Sharing a single 16-bit data bus between CPU, DMA controller, and peripheral bridge. IC Role / Device Role / Timing Role: Low-latency, direction-agnostic signal path controlled by independent OE signals synchronized to bus grant logic. Use Value: Reduces interconnect complexity versus discrete transceivers and avoids clock-domain crossing delays in multi-master systems. |
| FPGA I/O Expansion | Legacy Peripheral Bridging |
|
Use Scenario: Extending limited FPGA I/O pins to drive multiple 16-bit peripheral devices (e.g., ADCs, DACs, displays). IC Role / Device Role / Timing Role: Electrically transparent switch bank enabling time-multiplexed access without signal inversion or buffering delay. Use Value: Preserves signal edge rate and reduces FPGA pin count pressure-enables compact, cost-optimized carrier board designs. |
Use Scenario: Interfacing modern microcontrollers with legacy ISA or PC/104 peripherals requiring 16-bit bidirectional data lanes. IC Role / Device Role / Timing Role: Level-translation-free bus interface matching TTL voltage thresholds and timing margins of aging peripheral controllers. Use Value: Avoids custom logic or programmable logic for protocol adaptation-accelerates legacy system modernization projects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245DGVR | Includes series 10-Ω resistors on all I/O lines for improved EMI suppression and overshoot damping. | Better suited for noisy industrial environments or long trace runs where signal integrity dominates over raw speed. | Select SN74CBTD16245DGVR if board-level EMI testing reveals ringing or crosstalk above 200 MHz. |
| SN74LVC16245ADGVR | CMOS-based, 3.3-V only (1.65–3.6 V), higher Ron (~15 Ω), lower ICC (<1 µA), and slower tpd (3.5 ns). | Targets low-power, battery-operated 3.3-V systems-not interoperable with 5-V TTL buses. | Choose SN74LVC16245ADGVR only for new 3.3-V designs where power efficiency outweighs speed requirements. |
Compared with SN74CBT16245DGVR, SN74CBTD16245DGVR trades 2× higher on-resistance for built-in termination, while SN74LVC16245ADGVR shifts to a lower-voltage domain with 14× slower switching-neither is pin-compatible nor functionally interchangeable without schematic and layout revision.
Availability
SN74CBT16245DGVR is available at Aetrix Electronics and suitable for memory expansion, processor bus multiplexing, and FPGA I/O expansion requiring stable component supply and industrial temperature support.
Supply support for SN74CBT16245DGVR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, scalability, and broad ecosystem support.
The SN74CBT16245DGVR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for low-latency, bidirectional signal routing in 5-V computing, communications, and industrial control subsystems.
FAQ
What is the maximum operating voltage for SN74CBT16245DGVR?
The SN74CBT16245DGVR supports a supply voltage range of 4 V to 5.5 V under recommended conditions, with absolute maximum VCC rated at –0.5 V to 7 V. Exceeding 5.5 V may cause parametric degradation or reliability risk, and operation below 4 V violates guaranteed switching performance per the datasheet.
Does SN74CBT16245DGVR support bidirectional signal flow without direction control pins?
Yes, SN74CBT16245DGVR is inherently bidirectional: each of its 16 switch channels conducts equally from A to B or B to A when enabled. No DIR pin is required-the device relies solely on OE control to establish or break the conductive path, simplifying interface logic versus transceivers.
Can SN74CBT16245DGVR be used in 3.3-V systems?
SN74CBT16245DGVR is not recommended for standalone 3.3-V operation. Its VIH minimum is 2 V and VIL maximum is 0.8 V, but VCC must be ≥4 V for guaranteed ron, tpd, and noise margin performance. For 3.3-V buses, TI recommends SN74LVC16245A instead.
What is the thermal resistance (θJA) of the SN74CBT16245DGVR package?
The SN74CBT16245DGVR uses the TVSOP (DGV) package with a specified junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer board conditions and informs thermal derating for continuous 128-mA channel current operation.
How does the latch-up immunity of SN74CBT16245DGVR compare to industry standards?
SN74CBT16245DGVR exceeds JESD 78 Class II latch-up immunity with >100 mA rating, surpassing the 100 mA minimum requirement for Class II. This ensures robust operation in electrically noisy industrial environments where transient ground bounce or supply coupling could otherwise trigger parasitic SCR conduction.
SN74CBT16245DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.173", 4.40mm 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-TVSOP
SN74CBT16245DGVR FAQ
1.How can I place an order for SN74CBT16245DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16245DGVR 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 SN74CBT16245DGVR reliable?
The price and inventory of SN74CBT16245DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16245DGVR is usually 5 days.
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Once your SN74CBT16245DGVR 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 SN74CBT16245DGVR?
For technical support, including SN74CBT16245DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16245DGVR requirements.
6.How does Aetrix verify that SN74CBT16245DGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16245DGVR 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 SN74CBT16245DGVR meets industry standards.
7.What is the process for return or replacement of SN74CBT16245DGVR?
All SN74CBT16245DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16245DGVR, 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 SN74CBT16245DGVR part is unused and in its original packaging.
Return procedure for SN74CBT16245DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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