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Texas Instruments SN74CBT3383PWR
- Part No.:
- SN74CBT3383PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT3383PWR.pdf
- Description:
- IC BUS FET EXCH SW 5X2:2 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
SN74CBT3383PWR from Texas Instruments is a 10-bit TTL-compatible bus-exchange switch in TSSOP-24 package, featuring bidirectional signal flow, 5 Ω typical on-resistance, <1 ns propagation delay, and operation across 4.5 V–5.5 V supply. It enables byte-swapping between A/B signal pairs in enterprise server memory interconnects and high-speed Ethernet switch backplanes.
For engineers reviewing the SN74CBT3383PWR datasheet, SN74CBT3383PWR pinout, SN74CBT3383PWR application, or SN74CBT3383PWR equivalent, key selection criteria include its 200 MHz bandwidth capability, low 6 pF off-state capacitance, BE/BX dual-control logic for bus enable and nibble exchange, and compatibility with both 3.3-V and 5-V CMOS/TTL drivers.
Technical Context
The SN74CBT3383PWR implements a dual-mode 10-bit analog bus switch: in standard mode (BX = low), it routes 1A1↔1B1, 1A2↔1B2, ..., 5A2↔5B2; in exchange mode (BX = high), it cross-connects 1A1↔1B2, 1A2↔1B1, etc., enabling hardware-level byte swapping without clocking or logic overhead. Its FET-based architecture delivers near-zero propagation delay and flat rON over voltage and temperature.
Control is fully static: BE (active-low) enables/disables all switches simultaneously, while BX selects routing topology. The device draws only 50 µA max ICC and supports 128 mA per channel, with ESD ratings of ±3000 V HBM and ±1000 V CDM - suitable for hot-swap-capable backplane interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures interoperability with legacy 5-V TTL and mixed-voltage 3.3-V/5-V systems |
| rON (Typ) | 5 Ω - minimizes voltage drop and signal distortion at 128 mA channel current |
| Cio(OFF) | 6 pF - reduces capacitive loading on high-speed buses, preserving signal integrity up to 200 MHz |
| tpd (Max) | 1.5 ns - enables sub-nanosecond timing margins in DDR memory buffer and switch fabric designs |
| Propagation Delay Variation | <0.25 ns across channels - critical for skew-sensitive parallel bus applications like PCI-X and RapidIO |
| Input Compatibility | TTL- and 5-V/3.3-V CMOS-compatible - eliminates level-shifter requirements in multi-supply systems |
| ESD Rating (HBM) | ±3000 V - meets industrial-grade handling robustness without external protection diodes |
Pinout & Package
TSSOP-24 package (7.80 mm × 4.40 mm, 1.2 mm max height), JEDEC MO-153 compliant, with exposed pad not electrically connected. Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BE) | Active-low bus enable | Assert low to activate all 10 switch paths; high-Z state isolates A/B sides completely |
| 13 (BX) | Bus exchange select | High enables nibble-swapped routing (e.g., 1A1 ↔ 1B2); low enables direct A↔B mapping |
| 2–5, 6–9, 10–11, 14–15, 16–19, 20–23 | Bidirectional I/O pairs (1A1/1B1 through 5A2/5B2) | Each pair forms a single-pole double-throw (SPDT) analog path; no directionality or power sequencing required |
| 12 (GND) | Ground reference | Primary return path for all switching currents; must be low-impedance connection to minimize ground bounce |
| 24 (VCC) | Power supply | Single 5-V rail powers all internal circuitry and switch FETs; requires local 0.1-μF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bus exchange function | Hardware-selectable byte swap via BX pin - eliminates FPGA logic or software overhead in memory mirroring |
| Flat on-resistance profile | rON = 5 Ω typical across 0–5 V input range - ensures consistent signal attenuation and timing across full logic swing |
| Bidirectional zero-delay switching | Signal flows equally well A→B or B→A with identical tpd - essential for bidirectional protocols like SMBus and JTAG daisy chains |
| Low off-state capacitance | Cio(OFF) = 6 pF - prevents crosstalk and maintains >200 MHz bandwidth when adjacent lines are active |
| Hot-swap ready control interface | BE and BX accept 0.8 V / 2.0 V logic thresholds - compatible with powered-backplane insertion detection circuits |
Applications
| Enterprise Server Memory Interconnect | Ethernet Switch Fabric |
|---|---|
|
Use Scenario: Dynamic reconfiguration of DIMM address/data lanes during memory scrubbing or fault isolation. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling real-time rerouting of 10-bit memory command/address signals between controller and redundant DIMM banks. Use Value: Eliminates need for clocked multiplexers; preserves nanosecond-level timing alignment across all 10 lanes during live failover. |
Use Scenario: Selecting between two upstream packet processors feeding a shared 10-GbE PHY interface. IC Role / Device Role / Timing Role: 5-bit 2:1 multiplexer (using five A1/A2–B1/B2 pairs) controlled by BE/BX to route parallel data paths without added latency. Use Value: Achieves sub-1 ns path-to-path skew - critical for maintaining SerDes eye opening at 10.3125 Gbps line rate. |
| Routers with Dual Control Planes | Industrial PC I/O Expansion |
|
Use Scenario: Hardware arbitration between primary and backup control processors sharing a common peripheral bus (e.g., PCIe configuration space). IC Role / Device Role / Timing Role: Bus-exchange switch toggling between active/inactive processor pairs using BX to invert nibble order for legacy register mapping compliance. Use Value: Enables seamless switchover in <100 ns - faster than watchdog timeout cycles, preventing service interruption. |
Use Scenario: Isolating and multiplexing multiple RS-485 transceiver banks onto a single UART controller in modular PLC backplanes. IC Role / Device Role / Timing Role: 10-bit analog switch providing galvanically isolated signal path selection under microcontroller GPIO control (BE/BX). Use Value: Reduces component count vs. discrete MOSFET arrays; maintains 128 mA drive capability per channel for long-haul RS-485 segments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD3383PWR | Includes 3.3-V tolerant inputs (VIH = 2.0 V max), higher ICC (100 µA), same rON and pinout | Required where host controller operates at 3.3 V but bus runs at 5 V; adds level translation capability | Select when interfacing 3.3-V microcontrollers to 5-V legacy peripherals without external level shifters |
| SN74LVC1G3157DCKR | Single-channel SPDT, 5-V only, 6 Ω rON, 5.5 pF Cio(OFF), SC70-6 package | Not pin-compatible; used for discrete signal routing rather than parallel bus exchange | Choose for low-channel-count designs needing minimal footprint; unsuitable for 10-bit simultaneous switching |
Compared with SN74CBTD3383PWR, the SN74CBT3383PWR offers lower power and simpler 5-V-only interface; compared with SN74LVC1G3157DCKR, it provides integrated 10-bit coordination and hardware byte-swap - making it irreplaceable in parallel bus reconfiguration where channel correlation and skew control are mandatory.
Availability
SN74CBT3383PWR is available at Aetrix Electronics and suitable for enterprise servers, Ethernet switches, and industrial PCs requiring stable component supply with long-term lifecycle assurance.
Supply support for SN74CBT3383PWR 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 decades of leadership in high-speed logic and interface ICs.
The SN74CBT3383PWR belongs to TI's CBT (Crossbar Bus Technology) family, engineered specifically for low-latency, high-fidelity analog switching in mission-critical data-path applications such as telecom infrastructure and server memory subsystems.
FAQ
What is the maximum operating frequency supported by the SN74CBT3383PWR?
The SN74CBT3383PWR is characterized for operation up to 200 MHz, verified under CL = 50 pF load conditions. Its 5 Ω typical on-resistance and 6 pF off-state capacitance jointly enable this bandwidth; actual system frequency may vary based on PCB trace impedance, termination, and driver strength. The SN74CBT3383PWR datasheet specifies tpd ≤ 1.5 ns, confirming suitability for sub-5 ns clock domains.
Does the SN74CBT3383PWR require external pull-up or pull-down resistors on BE or BX pins?
No, the SN74CBT3383PWR has internally biased inputs meeting TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), so BE and BX can be driven directly from standard 5-V or 3.3-V CMOS outputs without external biasing. However, if left floating, BE defaults to high (switches disabled) and BX defaults to low (direct routing); intentional use requires active driving per functional table.
Can the SN74CBT3383PWR be used in hot-swap applications?
Yes - the SN74CBT3383PWR supports hot-swap operation due to its rail-to-rail input tolerance (–0.5 V to 7 V), ±3000 V HBM ESD rating, and ability to remain in high-impedance state (BE = high) during power ramp-up. Its 50 µA max ICC and absence of power-on reset circuitry allow safe insertion into live backplanes, provided VCC sequencing complies with recommended 4.5–5.5 V range.
How does the bus exchange (BX) function affect signal timing in the SN74CBT3383PWR?
The BX pin changes routing topology but introduces no additional timing penalty: propagation delay remains ≤1.5 ns in both direct (BX = low) and exchanged (BX = high) modes. This is confirmed by identical tpd specs in Table 1 of the SN74CBT3383PWR datasheet - because the internal FET paths are symmetric and length-matched, byte swapping occurs with zero added skew between paired signals like 1A1/1B2.
Is the SN74CBT3383PWR pin-compatible with other packages in the SN74CBT3383 family?
Yes - all SN74CBT3383 variants (DB, DBQ, DW, PW, JT, W) share identical 24-pin functional pinout per Figure 3 in the SN74CBT3383PWR datasheet. The SN74CBT3383PWR uses TSSOP-24 (PW), matching pin positions for BE, BX, VCC, GND, and all I/O pairs. Mechanical dimensions differ, but PCB layout can reuse footprint with minor land pattern adjustments for pitch and body size.
SN74CBT3383PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus FET Exchange Switch
- Circuit:
- 5 x 2:2
- Independent Circuits:
- 1
- 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:
- 24-TSSOP
SN74CBT3383PWR FAQ
1.How can I place an order for SN74CBT3383PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT3383PWR 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 SN74CBT3383PWR reliable?
The price and inventory of SN74CBT3383PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT3383PWR is usually 5 days.
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SN74CBT3383PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT3383PWR 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 SN74CBT3383PWR?
For technical support, including SN74CBT3383PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT3383PWR requirements.
6.How does Aetrix verify that SN74CBT3383PWR is sourced from the original manufacturer or authorized distributors?
All SN74CBT3383PWR 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 SN74CBT3383PWR meets industry standards.
7.What is the process for return or replacement of SN74CBT3383PWR?
All SN74CBT3383PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT3383PWR, 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 SN74CBT3383PWR part is unused and in its original packaging.
Return procedure for SN74CBT3383PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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