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Texas Instruments SN74CB3T3384PW
- Part No.:
- SN74CB3T3384PW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CB3T3384PW.pdf
- Description:
- IC BUS SWITCH 5 X 1:1 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
SN74CB3T3384PW from Texas Instruments is a 24-pin TSSOP high-speed FET bus switch with bidirectional 10-bit data flow, 5 Ω typical ON-state resistance, 0.25 ns typical propagation delay at 3.3 V, and mixed-mode voltage translation supporting 0–5 V I/O signaling across 2.3–3.6 V VCC. It enables level translation between 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS in memory interleaving and bus isolation systems.
For engineers reviewing the SN74CB3T3384PW datasheet, SN74CB3T3384PW pinout, SN74CB3T3384PW application, or SN74CB3T3384PW equivalent, key selection criteria include its dual 5-bit switch architecture with independent OE control, Ioff partial-power-down support, 5 pF OFF-state I/O capacitance, and 5-V-tolerant I/Os with device powered up or down.
Technical Context
The SN74CB3T3384PW implements two independent 5-bit FET bus switches controlled by 1OE and 2OE inputs; each switch connects A-port to B-port bidirectionally when OE is low, and presents high-impedance isolation when OE is high. Its voltage-translation behavior tracks VCC, enabling output levels ≈VCC when input exceeds VCC − 1 V.
It features undervoltage clamp diodes on all data and control inputs, supports 5-V-tolerant operation regardless of VCC state, and guarantees latch-up immunity >250 mA per JESD 17. The Ioff specification ensures no backflow current during partial power-down, maintaining system-level isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - defines minimum/maximum supply for guaranteed logic operation and voltage translation accuracy |
| ron (Typical) | 5 Ω - enables minimal signal attenuation and <0.25 ns propagation delay in high-speed digital paths |
| Cio(OFF) (Typical) | 5 pF - reduces capacitive loading on driven buses, preserving signal integrity in dense routing |
| tpd (Max) | 0.25 ns at 3.3 V - ensures sub-nanosecond switching for DDR, memory, and high-frequency control applications |
| Ioff (Max) | 10 µA at VCC = 0 V - prevents damaging current flow during hot-insertion or partial power-down sequences |
| VI/O Range | 0 V to 5.5 V - allows direct interfacing with legacy 5-V logic without external level shifters |
| ICC (Max) | 40 µA - supports ultra-low static power in battery-powered portable equipment |
Pinout & Package
TSSOP-24 package (PW), 7.9 mm × 4.5 mm footprint, 1.2 mm max height, 0.65 mm pitch, exposed metal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output-enable for first 5-bit switch | Active-low control: drives 1A1–1A5 ↔ 1B1–1B5 bidirectional path when low |
| 1A1–1A5, 1B1–1B5 | Data I/O ports for first switch bank | Bidirectional signal paths; support 0–5 V signaling independent of VCC |
| GND (Pin 12) | Ground reference | Primary return path for VCC and all I/O currents; must be low-impedance |
| VCC (Pin 13) | Power supply | Supplies internal bias and sets output voltage translation reference (≈VCC) |
| 2A1–2A5, 2B1–2B5 | Data I/O ports for second switch bank | Independent 5-bit bidirectional path, identical electrical characteristics to first bank |
| 2OE | Output-enable for second 5-bit switch | Active-low control: isolates or connects second bank independently of first |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Tracks VCC to deliver ≈VCC output levels for inputs ≥VCC − 1 V, enabling seamless 5-V/3.3-V/2.5-V interoperation |
| 5-V-tolerant I/Os | Operates safely with 0–5.5 V signals on all data pins regardless of VCC state (powered up/down) |
| Ioff partial-power-down support | Blocks current backflow when VCC = 0 V, protecting upstream drivers during hot-swap or staged power sequencing |
| Low ON-state resistance | 5 Ω typical minimizes voltage drop and timing skew across 10-bit parallel paths |
| Undershoot clamp diodes | Integrated protection on all inputs limits negative transients to −1.2 V, reducing need for external TVS |
Applications
| Memory Interleaving | Bus Isolation |
|---|---|
|
Use Scenario: Separating two memory banks sharing a common data bus while preventing contention during access arbitration. IC Role / Device Role / Timing Role: Bidirectional 10-bit switch enabling time-multiplexed access; dual OE control allows independent enable/disable of each memory segment. Use Value: Eliminates need for discrete logic or multiplexers; 5 Ω ron and 0.25 ns tpd preserve setup/hold timing margins across DDR2/DDR3 address/data lines. |
Use Scenario: Isolating a microcontroller's peripheral bus from an external expansion interface during sleep mode. IC Role / Device Role / Timing Role: High-impedance barrier activated by OE tied to MCU wake signal; maintains isolation with Ioff ≤10 µA at VCC = 0 V. Use Value: Prevents leakage-induced current draw and unintended peripheral activation; 5-V-tolerant I/Os allow direct connection to 5-V expansion modules. |
| Level Translation Bridge | Low-Power Portable Interface |
|
Use Scenario: Connecting a 3.3-V FPGA I/O bank to legacy 5-V sensor outputs in industrial monitoring hardware. IC Role / Device Role / Timing Role: Voltage-translating bus switch with output tracking VCC; supports 5-V input → 3.3-V output shift using 3.3-V VCC. Use Value: No external resistors or active translators required; 5 pF Cio(OFF) avoids signal degradation on 20-MHz sensor clock lines. |
Use Scenario: Enabling/disabling a USB PHY's 3.3-V analog front-end in a handheld medical device to extend battery life. IC Role / Device Role / Timing Role: Low-static-power (40 µA ICC max) switch controlling signal path between PHY and controller; OE synchronized to power-management unit. Use Value: Reduces standby current by >90% vs. always-on buffer; TSSOP-24 footprint fits tight PCB space constraints in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT3384PW | No voltage translation; fixed 3.3-V I/O only; lower ron (3 Ω typical); no 5-V tolerance on inputs | Suitable only in homogeneous 3.3-V systems; cannot replace SN74CB3T3384PW where 5-V input tolerance or mixed-voltage operation is required | Select when absolute minimum propagation delay (<0.15 ns) and lowest ON-resistance are critical, and all connected devices operate at 3.3 V. |
| SN74LVC1G3157DBVR | Single-pole double-throw (SPDT) analog switch; 1-channel; 6 Ω ron; 5-V tolerant; no dual-bank OE control | Lacks 10-bit parallel capability and independent bank enable; requires 10x devices for full replacement; higher board area and routing complexity | Consider only for point-to-point signal gating where dual-bank architecture is unnecessary and space permits discrete channel replication. |
Compared with SN74CB3T3384PW, SN74CBT3384PW offers faster switching but sacrifices voltage translation and 5-V tolerance, while SN74LVC1G3157DBVR provides single-channel flexibility at the cost of scalability and integrated dual-bank control-making SN74CB3T3384PW uniquely suited for compact, mixed-voltage 10-bit bus management.
Availability
SN74CB3T3384PW is available at Aetrix Electronics and suitable for memory interleaving, bus isolation, level translation bridges, and low-power portable interface designs requiring stable component supply and long-term design-in support.
Supply support for SN74CB3T3384PW 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 50 years of innovation in high-reliability IC design.
The SN74CB3T3384PW belongs to TI's CB3T family of advanced bus switches engineered for mixed-voltage digital systems requiring low-latency, low-power, and robust level translation in computing, communications, and industrial control.
FAQ
What is the maximum operating temperature range for the SN74CB3T3384PW?
The SN74CB3T3384PW is rated for operation from −40°C to +85°C ambient temperature, matching industrial-grade requirements. This range is confirmed in the "recommended operating conditions" table of the SCDS159B datasheet and applies specifically to the PW-package variant. Thermal performance is validated with θJA = 88°C/W under standard JEDEC test conditions.
Does the SN74CB3T3384PW support true bidirectional signal flow without direction control pins?
Yes, the SN74CB3T3384PW supports fully bidirectional data flow on all 10 I/O pairs (1A↔1B and 2A↔2B) without dedicated direction pins. Signal direction is determined solely by voltage differential and source impedance; the device functions identically whether driving from A-to-B or B-to-A, as verified in the functional diagram and switching characteristics tables of the datasheet.
Can the SN74CB3T3384PW be used with a 2.5-V supply to translate 5-V inputs down to 2.5-V outputs?
Yes, the SN74CB3T3384PW supports 5-V-to-2.5-V level translation when VCC = 2.5 V, as explicitly stated in the "Output Voltage Translation Tracks VCC" section and Figure 1 of the SCDS159B datasheet. Output high voltage approximates VCC (≈2.5 V) for inputs ≥VCC − 1 V (i.e., ≥1.5 V), satisfying 2.5-V CMOS logic thresholds.
Is the SN74CB3T3384PW pin-compatible with other members of the CB3T family such as SN74CB3T3384PWR?
Yes, the SN74CB3T3384PW and SN74CB3T3384PWR share identical TSSOP-24 (PW) package dimensions, pinout, and electrical specifications. The only difference is packaging format: PW is tube-packed (obsolete status per TI), while PWR is tape-and-reel. Both use the same KS384 top-side marking and are functionally interchangeable in PCB layout.
How does the Ioff feature of the SN74CB3T3384PW protect downstream circuitry during power-down?
The Ioff feature of the SN74CB3T3384PW limits current to ≤10 µA when VCC = 0 V and any I/O is biased to 0–5.5 V, preventing reverse current flow into a powered-down supply rail. This protects upstream drivers and avoids latch-up or damage during hot-plug events or staged power sequencing, as verified in the absolute maximum ratings and electrical characteristics sections of SCDS159B.
SN74CB3T3384PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 5 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74CB3T3384PW FAQ
1.How can I place an order for SN74CB3T3384PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3T3384PW 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 SN74CB3T3384PW reliable?
The price and inventory of SN74CB3T3384PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3T3384PW is usually 5 days.
3.What payment methods are accepted for SN74CB3T3384PW?
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SN74CB3T3384PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CB3T3384PW 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 SN74CB3T3384PW?
For technical support, including SN74CB3T3384PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3T3384PW requirements.
6.How does Aetrix verify that SN74CB3T3384PW is sourced from the original manufacturer or authorized distributors?
All SN74CB3T3384PW 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 SN74CB3T3384PW meets industry standards.
7.What is the process for return or replacement of SN74CB3T3384PW?
All SN74CB3T3384PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3T3384PW, 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 SN74CB3T3384PW part is unused and in its original packaging.
Return procedure for SN74CB3T3384PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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