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Texas Instruments SN74CBT16245CDGVR
- Part No.:
- SN74CBT16245CDGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT16245CDGVR.pdf
- Description:
- IC BUS SWITCH 8 X 1:1 48TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,912
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Product details
Overview
SN74CBT16245CDGVR from Texas Instruments is a 16-bit bidirectional FET bus switch IC with near-zero propagation delay (0.15 ns at VCC = 5 V), 3 Ω typical ON-state resistance, 5.5 pF typical OFF-state I/O capacitance, and undershoot protection up to −2 V on both A and B ports - used for PCI interface isolation and memory interleaving in industrial backplane systems.
For engineers reviewing the SN74CBT16245CDGVR datasheet, SN74CBT16245CDGVR pinout, SN74CBT16245CDGVR application, or SN74CBT16245CDGVR equivalent, key selection criteria include its dual 8-bit independent enable control (1OE/2OE), Ioff partial-power-down support, 0–5-V data signaling compatibility, and TVSOP-48 package with 0.4-mm pitch for high-density routing.
Technical Context
This device implements two independent 8-bit FET-based analog switches with TTL/CMOS-compatible control inputs and rail-to-rail signal pass-through capability. Each switch channel features active undershoot-protection circuitry that clamps transient excursions below ground to −2 V while maintaining high-impedance isolation when disabled.
It supports partial-power-down operation via Ioff (≤10 µA at VCC = 0 V), enabling safe hot-insertion in live-bus systems. The switch architecture delivers bidirectional conduction with symmetric ON-resistance (3 Ω typ) and minimal signal distortion due to low Cio(OFF) (5.5 pF) and Cio(ON) (14 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4 V to 5.5 V - ensures compatibility with 5-V legacy systems and tolerant of supply droop during transient load conditions. |
| ron (Typ) | 3 Ω - enables low-voltage-drop signal pass-through with <15 mV drop at 5 mA, preserving logic margins in high-speed buses. |
| tpd (Max) | 0.24 ns at VCC = 4 V - provides sub-nanosecond timing alignment critical for synchronous PCI and memory bus applications. |
| Cio(OFF) | 5.5 pF typical - minimizes capacitive loading on driven lines, reducing signal rise/fall time degradation and crosstalk coupling. |
| Undershoot Protection | −2 V on A/B ports - prevents false triggering or latch-up during negative transients caused by transmission-line reflections or ESD events. |
| Ioff | 10 µA max at VCC = 0 V - blocks backflow current during power sequencing, protecting upstream drivers in multi-rail systems. |
| VI/O Range | 0 V to 5.5 V - supports mixed-voltage interfacing across 0.8-V to 5-V logic families without level-shifting components. |
Pinout & Package
SN74CBT16245CDGVR is housed in a 48-pin TVSOP (DGV) package measuring 12.6 mm × 6.2 mm × 1.2 mm (max height), with 0.4-mm lead pitch and JEDEC MO-153 compliance. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Independent output-enable controls | Low-active enables for each 8-bit section; allows selective isolation of A↔B paths without affecting adjacent channels. |
| 1A1–1A8, 2A1–2A8 | Port A data terminals | Input/output pins for first and second 8-bit switch sections; fully bidirectional with no direction pin required. |
| 1B1–1B8, 2B1–2B8 | Port B data terminals | Corresponding bidirectional I/Os mirroring Port A; identical electrical characteristics and timing behavior. |
| VCC, GND | Power and reference rails | Four VCC and six GND pins distributed across package to minimize switching noise and improve PSRR. |
| NC | No internal connection | Pins 1 and 48 are unconnected - must be left floating or tied to GND for mechanical stability; not usable as thermal pads. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional zero-delay switching | Enables transparent signal routing between A and B ports with no added latency or direction-control overhead. |
| Active undershoot protection | Detects −2 V transients on either port and forces switch OFF state to prevent false conduction or damage. |
| Ioff partial-power-down support | Guarantees ≤10 µA leakage when VCC = 0 V, allowing safe insertion into powered-backplane systems. |
| Wide voltage signaling range | Supports 0.8-V to 5-V logic levels on data I/Os - eliminates need for external level shifters in mixed-supply designs. |
| Low input/output capacitance | 5.5 pF OFF-state capacitance reduces bus loading and preserves signal integrity up to 200 MHz. |
Applications
| PCI Bus Isolation | Memory Interleaving |
|---|---|
Use Scenario: Isolating add-in cards from motherboard PCI slots during hot-plug operations or fault containment. IC Role / Device Role / Timing Role: Bidirectional analog switch placed between PCI_DATA[31:0] and slot connector, controlled by local arbitration signals. Use Value: Prevents signal corruption during card insertion/removal and blocks undershoot-induced glitches from propagating across the bus. | Use Scenario: Routing address/data between dual-channel DDR SDRAM controllers and shared memory banks. IC Role / Device Role / Timing Role: High-speed 16-bit bus switch enabling dynamic channel selection with sub-ns timing alignment. Use Value: Maintains signal fidelity across interleaved access patterns while minimizing skew between parallel data lanes. |
| Backplane Signal Gating | Legacy Interface Bridging |
Use Scenario: Enabling/disabling communication paths between modular subsystems in telecom rack-mounted equipment. IC Role / Device Role / Timing Role: Dual 8-bit switch isolating LVCMOS control and status lines between hot-swappable modules. Use Value: Provides clean break-before-make switching with no DC path during transition, avoiding bus contention. | Use Scenario: Interfacing modern microcontrollers (1.8-V/3.3-V I/O) with legacy peripherals operating at 5-V TTL levels. IC Role / Device Role / Timing Role: Level-agnostic bidirectional buffer handling data/address transfers without translation logic. Use Value: Eliminates need for discrete MOSFET translators or dedicated level-shifters, reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16245DGVR | Includes integrated 3.3-V LVTTL-compatible biasing; higher ICC (10 µA max); same pinout and ron. | Optimized for 3.3-V-only systems; lacks −2 V undershoot protection on A/B ports. | Select when operating exclusively at 3.3 V and undershoot risk is mitigated externally. |
| SN74LVC16245ADGVR | CMOS-based non-FET design; higher tpd (5.4 ns); 3-state outputs only; no bidirectional analog pass-through. | Requires direction control (DIR pin); unsuitable for analog signal gating or true bidirectional data flow. | Choose only for digital-only 3.3-V bus buffering where direction is fixed and speed <100 MHz is acceptable. |
Compared with SN74CBT16245CDGVR, SN74CBTD16245DGVR trades undershoot protection for tighter 3.3-V drive strength, while SN74LVC16245ADGVR replaces analog switching with digital 3-state logic - making SN74CBT16245CDGVR uniquely suited for high-fidelity, bidirectional, mixed-voltage signal routing.
Availability
SN74CBT16245CDGVR is available at Aetrix Electronics and suitable for PCI interface isolation, memory interleaving, and backplane signal gating requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74CBT16245CDGVR 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 SN74CBT16245CDGVR belongs to TI's Widebus™ family of high-speed FET bus switches, engineered specifically for low-distortion, bidirectional signal routing in mixed-voltage computing and telecommunications infrastructure.
FAQ
What is the maximum undershoot voltage the SN74CBT16245CDGVR can tolerate on its A and B ports?
The SN74CBT16245CDGVR tolerates undershoot down to −2 V on both A and B ports, enforced by internal active clamp circuitry that forces the switch into OFF state during such events. This specification is verified per test conditions in the datasheet (VCC = 5.5 V, switch OFF), ensuring robustness against transmission-line reflections and ESD-induced transients without external protection diodes.
Does the SN74CBT16245CDGVR support true bidirectional signal flow without direction control pins?
Yes, the SN74CBT16245CDGVR supports fully bidirectional analog signal flow between A and B ports with no direction pin required. Its FET-based architecture allows seamless conduction in either direction when enabled, making it ideal for applications like PCI bus isolation where data flow direction changes dynamically and unpredictably.
What is the ON-state resistance (ron) specification for SN74CBT16245CDGVR, and how does it affect signal integrity?
The SN74CBT16245CDGVR has a typical ON-state resistance of 3 Ω (max 6 Ω), measured at VCC = 4.5 V and IO = 30 mA. This low ron ensures minimal voltage drop (<180 mV at 60 mA), preserving logic high/low margins and reducing insertion loss in high-speed digital or analog signal paths - critical for maintaining eye diagram integrity in 100+ MHz bus applications.
Can SN74CBT16245CDGVR operate with mixed-voltage signaling, such as connecting a 1.8-V FPGA to a 5-V peripheral?
Yes, the SN74CBT16245CDGVR supports 0–5.5 V signaling on all data I/Os, enabling direct interfacing between 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without level shifters. Its rail-to-rail analog switch architecture passes voltages within this range regardless of VCC (4–5.5 V), provided control inputs meet VIH/VIL thresholds - confirmed in the recommended operating conditions table.
Is the SN74CBT16245CDGVR compatible with partial-power-down systems, and what is its Ioff performance?
Yes, the SN74CBT16245CDGVR supports partial-power-down via Ioff, with leakage current limited to 10 µA maximum when VCC = 0 V and VI/O = 0–5.5 V. This feature prevents damaging back-current flow from live I/O lines into a powered-down device, satisfying JESD78 Class II latch-up immunity and enabling safe use in hot-swap backplane architectures.
SN74CBT16245CDGVR 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:
- Active
- 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
SN74CBT16245CDGVR FAQ
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Please submit a Request for Quotation (RFQ) for SN74CBT16245CDGVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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For technical support, including SN74CBT16245CDGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16245CDGVR requirements.
6.How does Aetrix verify that SN74CBT16245CDGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16245CDGVR 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 SN74CBT16245CDGVR meets industry standards.
7.What is the process for return or replacement of SN74CBT16245CDGVR?
All SN74CBT16245CDGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16245CDGVR, 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 SN74CBT16245CDGVR part is unused and in its original packaging.
Return procedure for SN74CBT16245CDGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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