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Texas Instruments SN74CBT16209ADLR
- Part No.:
- SN74CBT16209ADLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16209ADLR.pdf
- Description:
- IC BUS FET EXCHG SW 9X2:2 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
SN74CBT16209ADLR from Texas Instruments is an 18-bit high-speed TTL-compatible bus switch with 5-Ω on-state resistance, operating from 4 V to 5.5 V supply, supporting bidirectional signal routing between A/B ports under S0–S2 control for data exchange in memory and I/O expansion systems.
For engineers reviewing the SN74CBT16209ADLR datasheet, SN74CBT16209ADLR pinout, SN74CBT16209ADLR application, or SN74CBT16209ADLR equivalent, this device enables low-latency (0.25 ns typical propagation delay), low-capacitance (7.5 pF off-state) switching in high-density digital backplanes, FPGA I/O bridging, and legacy bus interface consolidation.
Technical Context
The SN74CBT16209ADLR implements a 9-bit dual-port bus exchanger architecture, where each of nine A1/A2–B1/B2 channel pairs routes signals based on three select inputs (S0, S1, S2), enabling eight distinct connection modes including disconnect, direct A→B mapping, and crossbar exchange (A1↔B2, A2↔B1). Its TTL-compatible control inputs accept 0.8 V low / 2 V high thresholds independent of VCC.
Each switch exhibits 4 Ω to 8 Ω on-resistance across 4 V–5.5 V operation, with 128 mA continuous channel current rating and 50 pF load-driven timing performance validated at 4 V and 5 V. The device operates over −40°C to +85°C and features 48-pin SSOP (DL) packaging with 0.5 mm pitch and 12.6 mm × 6.2 mm footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage (VCC) | 4 V to 5.5 V - supports standard 5 V TTL and mixed-voltage system interfacing without level shifters. |
| On-state resistance (ron) | 4 Ω to 8 Ω - ensures minimal voltage drop (<320 mV at 64 mA) and preserves signal integrity in high-current digital paths. |
| Propagation delay (tpd) | 0.25 ns (typ @ 5 V) - enables sub-nanosecond timing closure in high-speed parallel bus applications. |
| Off-state capacitance (Cio) | 7.5 pF - limits loading on inactive channels, critical for maintaining bandwidth in multi-drop or stubbed bus topologies. |
| Control input thresholds | VIL = 0.8 V, VIH = 2 V - guarantees reliable switching with standard TTL logic drivers without pull-up/pull-down biasing. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade embedded control, test equipment, and communications infrastructure. |
| Continuous channel current | 128 mA - supports robust drive capability for driving multiple CMOS loads or short PCB traces. |
Pinout & Package
SN74CBT16209ADLR uses a 48-pin SSOP (DL) package with 0.5 mm pitch, 12.6 mm × 6.2 mm body size, and 1.2 mm max height per JEDEC MO-153. Pin 1 is located at top-left corner with quadrants aligned per tape-and-reel orientation Q1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S0, S1, S2 | Bus configuration select inputs | Determine routing mode (disconnect, A→B, B→A, or cross-exchange) for all 9 channel pairs simultaneously. |
| A1–A2, B1–B2 (×9) | Signal channel terminals | Bidirectional I/O ports; each A1/A2 pair connects to corresponding B1/B2 pair when enabled per function table. |
| VCC | Power supply | Single 4–5.5 V rail powers all switches and control logic; no separate I/O or analog supply required. |
| GND (×4) | Ground reference | Four dedicated ground pins minimize ground bounce and ensure stable switching thresholds across full 18-bit width. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω switch resistance | Enables <320 mV IR drop at 64 mA, preserving logic high/low margins in fan-out-heavy bus nodes. |
| TTL-compatible control inputs | Eliminates need for external level translators when driven by legacy 74-series or microcontroller GPIOs. |
| 9-bit bus exchanger mode | Permits simultaneous A1↔B1 + A2↔B2 reconfiguration for memory-mapped I/O swapping without software overhead. |
| Low off-state capacitance | 7.5 pF isolation minimizes crosstalk and signal degradation on adjacent traces in dense PCB layouts. |
| Widebus™ family compatibility | Shares layout, thermal, and timing design practices with TI's 16-/32-bit Widebus switch portfolio for scalable system integration. |
Applications
| Memory Expansion Interface | FPGA I/O Bridging |
|---|---|
Use Scenario: Expanding address/data bus width between microcontroller and external SRAM/Flash using shared bus segments. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access to two memory banks without contention. Use Value: Eliminates need for discrete transceivers or glue logic; 0.25 ns tpd ensures no timing penalty in 50+ MHz bus cycles. |
Use Scenario: Adapting mismatched I/O standards between FPGA bank and legacy peripheral (e.g., ISA, PCI-X edge connector). IC Role / Device Role / Timing Role: Level-agnostic signal path selector allowing FPGA to dynamically route signals to alternate peripherals. Use Value: Supports hot-swap reconfiguration via S0–S2 control; 128 mA drive handles 5 V-tolerant FPGA I/O pads directly. |
| Industrial Backplane Interconnect | Test Equipment Signal Routing |
Use Scenario: Isolating or cross-connecting data lanes across modular PLC backplane slots during diagnostics or firmware update. IC Role / Device Role / Timing Role: Fault-tolerant bus exchanger providing configurable A↔B signal mapping with hardware-selectable topology. Use Value: 48-pin SSOP fits standard 0.1" grid spacing; −40°C to +85°C rating ensures reliability in uncontrolled cabinet environments. |
Use Scenario: Automated test system requiring dynamic signal path selection between DUT, instruments, and reference sources. IC Role / Device Role / Timing Role: Low-latency, low-crosstalk switch matrix element controlled by test controller GPIOs. Use Value: 7.5 pF off-capacitance prevents measurement drift; 4 Ω on-resistance maintains signal fidelity up to 200 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16210DGGR | 3.3 V–5.5 V supply range; includes output-enable (OE) pin not present on SN74CBT16209ADLR. | Supports 3.3 V system integration and synchronous enable/disable sequencing; lacks S0–S2 exchanger logic. | Select when 3.3 V compatibility or global OE control is required; not suitable for crossbar exchange functionality. |
| SN74CBT16210DLR | Same 48-pin SSOP package and 5 V operation, but provides 20-bit fixed-direction switching (no S0–S2 select logic). | Used for static bus extension only; no data exchange or multiplexing capability-pure 1:1 port forwarding. | Choose for simple bus buffering where dynamic reconfiguration is unnecessary and pin count matches. |
Compared with SN74CBT16209ADLR, SN74CBTD16210DGGR adds 3.3 V support and OE control but removes exchanger functionality, while SN74CBT16210DLR offers identical packaging and voltage range but eliminates programmable routing-making SN74CBT16209ADLR uniquely suited for dynamic bus topology management.
Availability
SN74CBT16209ADLR is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA I/O bridging, industrial backplane interconnect, and automated test equipment signal routing requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74CBT16209ADLR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with decades of leadership in high-speed interface and bus technology.
The SN74CBT16209ADLR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, low-distortion signal routing in industrial, computing, and communications infrastructure where deterministic timing and TTL compatibility are essential.
FAQ
What is the maximum operating frequency supported by the SN74CBT16209ADLR?
The SN74CBT16209ADLR does not specify a maximum clock frequency, as it is a passive analog switch-not a clocked device. Its 0.25 ns typical propagation delay and 7.5 pF off-capacitance support clean signal transmission up to 200+ MHz in well-terminated 50 Ω environments, verified under CL = 50 pF load conditions per the official datasheet.
Does the SN74CBT16209ADLR require external pull-up or pull-down resistors on its S0, S1, S2 control inputs?
No, the SN74CBT16209ADLR does not require external biasing on S0, S1, or S2. Its TTL-compatible inputs have defined VIH = 2 V and VIL = 0.8 V thresholds, and the datasheet explicitly states that unused control inputs must be held at VCC or GND-achievable directly via MCU GPIO or hardwired connections without resistors.
Can the SN74CBT16209ADLR operate with a 3.3 V supply?
No, the SN74CBT16209ADLR is not rated for 3.3 V operation. Its recommended VCC range is strictly 4 V to 5.5 V, and absolute maximum ratings cap VCC at 7 V. For 3.3 V systems, consider the pin-compatible SN74CBTD16210DGGR, which supports 3.3 V–5.5 V and includes OE control.
How many independent signal paths does the SN74CBT16209ADLR provide?
The SN74CBT16209ADLR provides 18 independent bidirectional signal paths, organized as nine A1/A2–B1/B2 channel pairs. Each pair can be individually routed or disconnected based on the S0–S2 select code, enabling either 18-bit bus switching or 9-bit data exchange functionality.
Is the SN74CBT16209ADLR RoHS compliant and lead-free?
Yes, the SN74CBT16209ADLR is RoHS compliant and features NiPdAu (NIPDAU) lead finish per TI's Package Option Addendum. It carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for lead-free reflow up to 260°C peak temperature.
SN74CBT16209ADLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus FET Exchange Switch
- Circuit:
- 9 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:
- 48-SSOP
SN74CBT16209ADLR FAQ
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Please submit a Request for Quotation (RFQ) for SN74CBT16209ADLR 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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The price and inventory of SN74CBT16209ADLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16209ADLR is usually 5 days.
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Once your SN74CBT16209ADLR order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74CBT16209ADLR?
For technical support, including SN74CBT16209ADLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16209ADLR requirements.
6.How does Aetrix verify that SN74CBT16209ADLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16209ADLR 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 SN74CBT16209ADLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16209ADLR?
All SN74CBT16209ADLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16209ADLR, 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 SN74CBT16209ADLR part is unused and in its original packaging.
Return procedure for SN74CBT16209ADLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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