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Texas Instruments SN74CBT16390DL
- Part No.:
- SN74CBT16390DL
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16390DL.pdf
- Description:
- IC MUX/DEMUX 16 X 1:2 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:364
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Product details
Overview
SN74CBT16390DL from Texas Instruments is a 16-bit to 32-bit FET bus switch with dual-output-enable control, 5-Ω on-state resistance, TTL-compatible inputs, and operation over –40°C to 85°C. It functions as a bidirectional multiplexer/demultiplexer for memory interleaving and PCI bus isolation in embedded computing systems.
For engineers reviewing the SN74CBT16390DL datasheet, SN74CBT16390DL pinout, SN74CBT16390DL application, or SN74CBT16390DL equivalent, key selection criteria include its dual-OE-controlled 16:32 switching architecture, 0.25 ns propagation delay, ±1 µA input leakage, 5.5 V absolute max supply rating, and SSOP-56 package thermal impedance of 56°C/W.
Technical Context
The SN74CBT16390DL implements a passive FET-based switch matrix with two independent enable paths (OE1, OE2), allowing simultaneous connection of the 16-bit A port to either 1B (16-bit) or 2B (16-bit) ports-or both-without internal logic buffering or level translation. Its channel structure supports bidirectional signal flow with no DC bias requirement.
Each switch exhibits 5–7 Ω typical on-resistance at VCC = 4.5 V and 30 mA current, with <5.5 pF off-state capacitance and <5 pF control-input capacitance. The device meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM), enabling robust use in hot-plug and mixed-voltage board environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, ensuring minimal voltage drop (<210 mV at 30 mA) and low power loss in high-speed data paths. |
| Propagation delay (tpd) | 0.25 ns typical, enabling sub-nanosecond signal routing critical for PCI and memory-bus timing budgets. |
| Supply voltage range | 4.5 V to 5.5 V operating; –0.5 V to 7 V absolute max, supporting transient tolerance and legacy 5-V system integration. |
| Input leakage current | ±1 µA at VCC = 5.5 V, minimizing standby power draw and preventing unintended node loading in high-impedance buses. |
| Off-state capacitance (Cio) | 5.5 pF, reducing crosstalk and maintaining signal integrity during isolation mode in dense PCB layouts. |
| ESD protection | 2000-V HBM, 200-V MM per JESD 22, eliminating need for external TVS diodes in standard industrial handling scenarios. |
| Latch-up immunity | >250 mA per JESD 17, guaranteeing fault resilience during bus contention or ground bounce events. |
Pinout & Package
SN74CBT16390DL uses a 56-pin SSOP (DL) package with 0.5-mm lead pitch, 14.24-mm width, and 1.2-mm max height per JEDEC MO-194. Thermal resistance θJA is 56°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A16 | 16-bit common input/output port | Bidirectional data path shared between 1B and 2B; requires no direction control logic. |
| 1B1–1B16 | First 16-bit switched port | Connected to A port only when OE1 = L; electrically isolated otherwise. |
| 2B1–2B16 | Second 16-bit switched port | Connected to A port only when OE2 = L; independent of OE1 state. |
| OE1, OE2 | Active-low output enables | Independent control of each 16-bit path; both low enables parallel connection of A to 1B and 2B simultaneously. |
| VCC, GND (×2) | Power and ground terminals | Dual VCC/GND pairs reduce switching noise and improve PSRR in high-frequency operation. |
| NC (pins 27, 28, 55, 56) | No internal connection | Unbonded pads; must remain unconnected to avoid mechanical stress or solder wicking issues. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Enables <210 mV voltage drop at 30 mA, preserving signal swing and timing margins in 5-V PCI and memory buses. |
| Dual independent OE control | Allows dynamic reconfiguration of data routing-e.g., connecting A to 1B for read, then to 2B for write-without bus turnaround delays. |
| TTL-compatible input thresholds | VIH = 2 V min / VIL = 0.8 V max ensures interoperability with legacy 5-V CMOS, TTL, and LVTTL drivers without level shifters. |
| Sub-nanosecond propagation delay | 0.25 ns tpd supports >1 GHz effective data rates in point-to-point links where skew minimization is critical. |
| 250 mA latch-up immunity | Guarantees operation under worst-case bus contention or ground-shift faults without destructive failure or system reset. |
Applications
| Memory Interleaving | PCI Slot Isolation |
|---|---|
|
Use Scenario: Two independent DRAM banks are accessed alternately to double effective bandwidth while sharing address/data lines. IC Role / Device Role / Timing Role: SN74CBT16390DL acts as a bidirectional 16:32 multiplexer, routing A-port signals to either bank's 1B or 2B interface based on OE1/OE2 state. Use Value: Eliminates need for separate address latches or clock-domain crossing logic; maintains full 5-V signal integrity across both banks. |
Use Scenario: A single PCI controller connects to two peripheral slots, requiring dynamic isolation to prevent electrical conflicts during hot-plug or configuration cycles. IC Role / Device Role / Timing Role: SN74CBT16390DL serves as a dual-path bus switch, enabling OE1 to isolate slot 1 and OE2 to isolate slot 2 independently. Use Value: Prevents back-driving between slots during enumeration; supports concurrent initialization with <5 ns enable/disable timing. |
| Legacy Bus Expansion | Test Access Multiplexing |
|
Use Scenario: A microcontroller with limited GPIO expands its 16-bit parallel bus to drive two separate peripherals (e.g., LCD + SRAM) using time-multiplexed addressing. IC Role / Device Role / Timing Role: SN74CBT16390DL functions as a demultiplexer, steering A-port data to 1B (LCD) or 2B (SRAM) under software-controlled OE1/OE2. Use Value: Avoids bus contention and eliminates external tristate buffers; maintains 5-V logic compatibility without voltage translation. |
Use Scenario: Production test equipment routes a single debug probe interface to multiple ICs on a board via shared JTAG or boundary-scan chains. IC Role / Device Role / Timing Role: SN74CBT16390DL operates as a test-path selector, connecting the probe's A port to 1B (IC1) or 2B (IC2) under test-mode control. Use Value: Reduces test fixture complexity; preserves signal fidelity with <5.5 pF off-capacitance to avoid chain timing violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16210DL | 32-bit to 32-bit switch with 3-state outputs; higher Ron (7–10 Ω); includes output-enable inversion logic. | Designed for bidirectional 32-bit bus expansion with tristate capability-not direct replacement for 16:32 multiplexing. | Select when full 32-bit parallel routing with independent output control is required; not suitable for memory interleaving topology. |
| SN74CBT3244DL | 8-bit dual-supply switch (VCCA/VCCB); supports 3.3 V/5 V level translation; Ron = 6–9 Ω; no dual-OE architecture. | Intended for mixed-voltage I/O bridging-not optimized for single-supply 16:32 fanout or simultaneous dual-path connection. | Choose for voltage-level shifting between 3.3 V and 5 V domains; lacks OE1/OE2 independence needed for PCI slot isolation. |
Compared with SN74CBT16390DL, SN74CBTD16210DL provides wider bus width but no true 16:32 multiplexing, while SN74CBT3244DL enables voltage translation but sacrifices dual-OE flexibility-making SN74CBT16390DL uniquely suited for memory interleaving and dual-slot PCI isolation.
Availability
SN74CBT16390DL is available at Aetrix Electronics and suitable for memory interleaving, PCI bus isolation, legacy bus expansion, and test access multiplexing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74CBT16390DL 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 digital signal technologies, with decades of expertise in high-speed logic and interface solutions.
The SN74CBT16390DL belongs to TI's Widebus™ family of FET bus switches, engineered specifically for low-latency, low-distortion signal routing in 5-V memory, PCI, and industrial control systems.
FAQ
What is the maximum operating temperature range for the SN74CBT16390DL?
The SN74CBT16390DL is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by thermal characterization showing 56°C/W θJA in the DL package. Operation outside this range may compromise on-resistance stability, timing parameters, or ESD robustness. Always verify board-level thermal design against worst-case power dissipation of 3 µA ICC at VCC = 5.5 V.
Does the SN74CBT16390DL require external pull-up or pull-down resistors on OE1 and OE2?
No, the SN74CBT16390DL does not require external pull-up or pull-down resistors on OE1 and OE2. Its TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) allow direct interfacing with 5-V CMOS, TTL, or LVTTL drivers. However, TI recommends holding all unused control inputs at VCC or GND to prevent floating states that could cause undefined switching behavior or increased ICC.
Can the SN74CBT16390DL be used in 3.3-V systems?
The SN74CBT16390DL is specified only for 4.5 V to 5.5 V operation and is not characterized for reliable use at 3.3 V. Its on-resistance increases significantly below 4.5 V, and input thresholds are optimized for 5-V logic families. For 3.3-V applications, TI recommends alternatives like SN74CBT3244DL, which supports dual-supply operation and explicit 3.3-V/5-V level translation.
What is the function of the NC pins on the SN74CBT16390DL?
The NC pins (27, 28, 55, 56) on the SN74CBT16390DL have no internal connection and must remain unconnected on the PCB. These are unbonded die pads included for mechanical symmetry and package mold integrity. Soldering or routing to these pins risks mechanical stress, solder bridging, or contamination-induced reliability issues-TI explicitly prohibits their use in layout or assembly.
How does the SN74CBT16390DL handle simultaneous assertion of OE1 and OE2?
When both OE1 and OE2 are low, the SN74CBT16390DL electrically connects the A port to both 1B and 2B ports simultaneously-enabling true 16:32 fanout. This mode is fully characterized with 5–7 Ω on-resistance per path and <5.5 pF off-capacitance, supporting concurrent data transfer to two destinations without added latency or signal degradation.
SN74CBT16390DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Multiplexer/Demultiplexer
- Circuit:
- 16 x 1:2
- 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:
- 56-SSOP
SN74CBT16390DL FAQ
1.How can I place an order for SN74CBT16390DL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16390DL 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 SN74CBT16390DL reliable?
The price and inventory of SN74CBT16390DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16390DL is usually 5 days.
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SN74CBT16390DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16390DL 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 SN74CBT16390DL?
For technical support, including SN74CBT16390DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16390DL requirements.
6.How does Aetrix verify that SN74CBT16390DL is sourced from the original manufacturer or authorized distributors?
All SN74CBT16390DL 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 SN74CBT16390DL meets industry standards.
7.What is the process for return or replacement of SN74CBT16390DL?
All SN74CBT16390DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16390DL, 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 SN74CBT16390DL part is unused and in its original packaging.
Return procedure for SN74CBT16390DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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