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Texas Instruments 74CBT16245DGGRE4
- Part No.:
- 74CBT16245DGGRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74CBT16245DGGRE4.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
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Product details
Overview
74CBT16245DGGRE4 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 bus isolation applications.
For engineers reviewing the 74CBT16245DGGRE4 datasheet, 74CBT16245DGGRE4 pinout, 74CBT16245DGGRE4 application, or 74CBT16245DGGRE4 equivalent, key selection criteria include bidirectional switching capability, 5-Ω ron, dual OE control, thermal performance (θJA = 70°C/W), and TSSOP-48 package compatibility with high-density PCB layouts.
Technical Context
The 74CBT16245DGGRE4 implements two independent 8-bit FET-based transmission gates, each controlled by a dedicated OE input. When OE is low, the A–B path conducts bidirectionally with minimal voltage drop; when high, the switch presents >10⁹ Ω isolation between ports.
Its architecture avoids internal latching or level-shifting-signal integrity relies entirely on passive FET conduction. The device meets JESD 78 Class II latch-up immunity (>100 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM, 1000-V CDM), confirming robustness in mixed-signal board environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, enabling <10 mV drop at 2 mA signal current |
| Propagation delay (tpd) | 0.25 ns at VCC = 5 V, supporting >1 GHz bus toggle rates without timing penalty |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed 4.5–5.5 V system rails |
| Control input thresholds | VIH = 2 V, VIL = 0.8 V - directly driven by standard TTL outputs without level translation |
| Thermal resistance (θJA) | 70°C/W for TSSOP-48 package - supports continuous 128 mA channel current with ≤3.5°C rise at 100 mW dissipation |
| ESD protection | 2000-V HBM - eliminates need for external TVS diodes in non-industrial handling environments |
Pinout & Package
TSSOP-48 package (DGG), 12.6 mm × 6.2 mm × 1.2 mm max height, JEDEC MO-153 compliant, with 0.5-mm pitch and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable controls | Active-low enables for each 8-bit switch bank - allows selective isolation of memory vs. peripheral buses |
| 1A1–1A8, 2A1–2A8 | Port A terminals (Bank 1 & 2) | Input/output nodes tied to upstream logic (e.g., CPU data bus); bidirectional with no direction pin |
| 1B1–1B8, 2B1–2B8 | Port B terminals (Bank 1 & 2) | Input/output nodes connected to downstream loads (e.g., SRAM, FPGA I/O); electrically identical to Port A |
| VCC (Pins 7, 18, 29, 40) | Power supply | Four distributed VCC pins reduce IR drop and improve noise rejection across 16-channel operation |
| GND (Pins 4, 11, 22, 33, 44) | Ground reference | Five GND pins provide low-inductance return paths, critical for maintaining <0.25 ns tpd consistency |
| NC (Pins 1, 48) | No internal connection | Unused corner pins - must remain unconnected; no routing or thermal relief required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 5-Ω FET switch | Enables transparent, polarity-agnostic data flow between A and B ports without direction control logic |
| Dual independent OE inputs | Permits concurrent or staggered enablement of two 8-bit domains - essential for multi-bank memory arbitration |
| TTL-compatible control interface | Eliminates need for level shifters when interfacing with legacy 5-V microcontrollers or CPLDs |
| 100 mA latch-up immunity | Guarantees fault tolerance during hot-plug or power-rail sequencing events in backplane systems |
| 2000-V HBM ESD rating | Reduces field failure risk during manual handling and board-level assembly without added protection circuitry |
Applications
| Memory Expansion Interface | PCI/ISA Bus Isolation |
|---|---|
|
Use Scenario: Expanding 16-bit data bus from microcontroller to external SRAM or Flash memory. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating memory address/data lines during CPU idle cycles to prevent leakage and contention. Use Value: 0.25 ns tpd preserves setup/hold timing margins; 5-Ω ron ensures <50 mV signal degradation at 20 mA load. |
Use Scenario: Electrically isolating legacy ISA or PCI bus segments to prevent ground loop noise coupling. IC Role / Device Role / Timing Role: High-speed analog switch decoupling bus segments while maintaining signal integrity for 33-MHz synchronous transfers. Use Value: Dual OE control allows dynamic segmentation; 70°C/W θJA sustains continuous operation under full bus loading. |
| FPGA I/O Bridging | Test Access Port (TAP) Multiplexing |
|
Use Scenario: Routing configuration data between JTAG controller and multiple FPGAs sharing a common boundary-scan chain. IC Role / Device Role / Timing Role: Low-capacitance (4.5 pF Cio(OFF)) switch enabling clean TCK/TMS signal distribution without skew. Use Value: 3.5 pF input capacitance minimizes clock jitter; bidirectional operation supports both programming and debug readback paths. |
Use Scenario: Sharing a single JTAG debugger across multiple ASICs on a test board via time-multiplexed access. IC Role / Device Role / Timing Role: Fast-enable/disable switch selecting TDI/TDO paths between host debugger and target devices. Use Value: 1.2 ns ten and 3.9 ns tdis allow sub-10 ns switching windows - sufficient for 100-MHz TCK rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245DGGR | Includes series resistors (26 Ω) on all I/O pins for improved EMI suppression; otherwise identical pinout and logic | Better suited for noisy industrial environments where radiated emissions must meet CISPR 22 Class B | Select when board-level EMI testing fails with 74CBT16245DGGRE4 and layout fixes are impractical |
| 74LVC16245ADGGRE4 | CMOS-based, 3.3-V only (1.65–3.6 V), higher ron (~15 Ω), lower drive strength | Targeted at low-power 3.3-V systems; incompatible with 5-V buses without level translation | Choose only for new 3.3-V designs where power budget <10 µA per channel is mandatory |
Compared with SN74CBTD16245DGGR and 74LVC16245ADGGRE4, the 74CBT16245DGGRE4 delivers optimal balance of speed (0.25 ns tpd), drive capability (128 mA), and 5-V compatibility - making it the preferred choice for legacy and mixed-voltage bus architectures requiring zero-latency switching.
Availability
74CBT16245DGGRE4 is available at Aetrix Electronics and suitable for memory expansion interfaces, PCI bus isolation, FPGA I/O bridging, and JTAG multiplexing requiring stable component supply and long-term industrial lifecycle support.
Supply support for 74CBT16245DGGRE4 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 solutions, with over 90 years of innovation in high-reliability IC design.
The 74CBT16245DGGRE4 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 backplanes.
FAQ
What is the maximum continuous current rating per channel for the 74CBT16245DGGRE4?
The 74CBT16245DGGRE4 supports up to 128 mA continuous channel current per switch path, verified under absolute maximum ratings. This rating assumes proper PCB thermal design - with its 70°C/W θJA, the device maintains safe junction temperature even under sustained 100 mA per channel at 85°C ambient. Exceeding this limit risks irreversible FET degradation.
Does the 74CBT16245DGGRE4 require external pull-up or pull-down resistors on its OE inputs?
No, the 74CBT16245DGGRE4 does not require external biasing on OE inputs. Its TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V) ensure reliable recognition of standard logic levels. However, TI recommends tying unused OE inputs directly to VCC or GND - floating controls may cause undefined switching states and increased ICC.
Can the 74CBT16245DGGRE4 operate reliably at 3.3 V supply voltage?
No, the 74CBT16245DGGRE4 is specified only for 4 V to 5.5 V operation. At 3.3 V, ron increases beyond 15 Ω and tpd degrades significantly, violating guaranteed timing and drive specifications. For 3.3-V systems, TI recommends the 74LVC16245ADGGRE4 instead - but note it is not pin-compatible or functionally interchangeable.
How does the 74CBT16245DGGRE4 handle signal directionality without a DIR pin?
The 74CBT16245DGGRE4 is inherently bidirectional - signals pass freely from A to B or B to A when OE is low, with no direction control needed. Its FET-based architecture provides symmetrical conduction characteristics, eliminating propagation delay asymmetry. This simplifies PCB routing and removes timing-critical DIR signal synchronization.
Is the 74CBT16245DGGRE4 RoHS-compliant and lead-free?
Yes, the 74CBT16245DGGRE4 carries RoHS-compliant marking and uses NiPdAu (NIPDAU) lead finish, meeting JEDEC J-STD-020 moisture sensitivity Level-1 (260°C peak reflow). Its TSSOP-48 package is fully compatible with lead-free soldering processes and certified per TI's RoHS Statement dated October 2025.
74CBT16245DGGRE4 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:
- Discontinued at Digi-Key
- 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
74CBT16245DGGRE4 FAQ
1.How can I place an order for 74CBT16245DGGRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74CBT16245DGGRE4 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 74CBT16245DGGRE4 reliable?
The price and inventory of 74CBT16245DGGRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74CBT16245DGGRE4 is usually 5 days.
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74CBT16245DGGRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74CBT16245DGGRE4 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 74CBT16245DGGRE4?
For technical support, including 74CBT16245DGGRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74CBT16245DGGRE4 requirements.
6.How does Aetrix verify that 74CBT16245DGGRE4 is sourced from the original manufacturer or authorized distributors?
All 74CBT16245DGGRE4 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 74CBT16245DGGRE4 meets industry standards.
7.What is the process for return or replacement of 74CBT16245DGGRE4?
All 74CBT16245DGGRE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74CBT16245DGGRE4, 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 74CBT16245DGGRE4 part is unused and in its original packaging.
Return procedure for 74CBT16245DGGRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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