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Texas Instruments SN74CBT16244DLR
- Part No.:
- SN74CBT16244DLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16244DLR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
SN74CBT16244DLR from Texas Instruments is a 16-bit FET bus switch IC organized as four independent 4-bit low-impedance switches, featuring 5-Ω typical on-state resistance, TTL-compatible input levels, and standard '16244 pinout. It enables bidirectional signal routing between port A and port B with minimal propagation delay (0.25 ns at VCC = 5 V), used in high-speed data path isolation for memory expansion and peripheral multiplexing.
For engineers reviewing the SN74CBT16244DLR datasheet, SN74CBT16244DLR pinout, SN74CBT16244DLR application, or SN74CBT16244DLR equivalent, key selection criteria include on-resistance matching across channels, OE-controlled bidirectional isolation timing (ten/tdis ≤ 5.5 ns), thermal performance in SSOP-48 (θJA = 63°C/W), and compatibility with 4–5.5 V supply systems requiring low-capacitance switching.
Technical Context
The SN74CBT16244DLR implements four independent FET-based analog switches, each controlled by a dedicated output-enable (OE) input operating at TTL logic thresholds (VIL = 0.8 V, VIH = 2 V). When OE is low, the switch conducts bidirectionally with ron ≤ 7 Ω at VCC = 4.5 V and II = 30 mA; when OE is high, it presents >10⁹ Ω isolation between ports.
Its architecture avoids internal latching or level-shifting circuitry-signal integrity relies solely on passive FET conduction. The device operates over –40°C to 85°C with ICC ≤ 3 µA (quiescent) and supports CL = 50 pF loads, delivering tpd ≤ 0.35 ns at VCC = 5 V, making it suitable for sub-nanosecond timing-critical interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5–7 Ω at VCC = 4.5 V, ensuring <10 mV voltage drop at 30 mA channel current for clean signal pass-through. |
| Propagation delay (tpd) | 0.25 ns (typ) at VCC = 5 V, CL = 50 pF - enables GHz-range digital bus switching without timing skew. |
| Enable/disable time (ten/tdis) | ≤5.5 ns (max) - guarantees fast channel gating for dynamic bus arbitration and hot-swap control. |
| Supply voltage range | 4–5.5 V - compatible with 5 V TTL and mixed-voltage systems using regulated 4.5–5.5 V rails. |
| Input capacitance (Ci) | 2.5 pF per control input - minimizes loading on upstream drivers and preserves edge rate fidelity. |
| Off-state capacitance (Cio) | 4.5 pF - reduces crosstalk and maintains signal integrity during channel disable states. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded and communications equipment environments. |
Pinout & Package
SN74CBT16244DLR uses a 48-pin SSOP (Shrink Small Outline Package) with 0.5 mm pitch, 12.4–12.6 mm body width, and 6.0–6.2 mm body length. Package height is ≤1.2 mm, compatible with automated SMT assembly and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE–4OE | Output-enable inputs (active-low) | Four independent controls - each enables/disables one 4-bit switch section; tied to GND or logic low to activate. |
| 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Port A terminals (input/output) | Bidirectional I/O pins - connect to source-side buses (e.g., CPU data lines); no direction pin required. |
| 1B1–1B4, 2B1–2B4, 3B1–3B4, 4B1–4B4 | Port B terminals (input/output) | Bidirectional I/O pins - connect to destination-side buses (e.g., peripheral address/data lines). |
| VCC (pins 7, 22, 31, 46) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity across the 16-bit array. |
| GND (pins 4, 13, 25, 36, 43) | Ground reference | Five GND pins provide low-inductance return paths, critical for maintaining signal integrity at sub-ns switching speeds. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω typical on-resistance | Enables <10 mV voltage drop at 30 mA, preserving TTL logic margins across full 16-bit data paths. |
| 0.25 ns propagation delay | Supports >1 GHz effective data rates without added timing budget overhead in high-speed backplanes. |
| TTL-compatible control inputs | Accepts standard 0.8 V / 2.0 V logic thresholds - eliminates need for level translators when interfacing with legacy 5 V controllers. |
| Independent 4-bit OE controls | Allows granular power/performance management - e.g., disable unused peripheral sections while keeping memory active. |
| Low off-state capacitance (4.5 pF) | Minimizes capacitive loading on inactive buses, preventing signal degradation in multi-drop configurations. |
Applications
| Memory Expansion Interface | Peripheral Multiplexing |
|---|---|
|
Use Scenario: Isolating multiple SRAM or Flash devices sharing a common data/address bus in microcontroller-based systems. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling time-multiplexed access to up to four memory banks without contention. Use Value: Eliminates need for discrete transceivers or complex glue logic while maintaining sub-ns timing alignment across all 16 data lines. |
Use Scenario: Sharing a single UART or SPI controller among multiple sensors, displays, or communication modules. IC Role / Device Role / Timing Role: Signal path gate that routes serial data lines only to the selected peripheral under OE control. Use Value: Prevents bus conflicts and leakage currents during idle periods, reducing system-level EMI and standby power. |
| Hot-Swappable Module Interface | Test Access Point Switching |
|
Use Scenario: Enabling safe insertion/removal of daughterboards in field-upgradable industrial controllers. IC Role / Device Role / Timing Role: High-isolation switch inserted between host processor and module connector to break DC and AC coupling before physical disconnect. Use Value: Provides >10⁹ Ω off-state impedance and <5 ns disable time, meeting IEC 61000-4-2 ESD-safe hot-swap requirements. |
Use Scenario: Routing JTAG, SWD, or boundary-scan signals to multiple PCB test points or ICs during production testing. IC Role / Device Role / Timing Role: Low-capacitance signal selector allowing one debug probe to service up to four target devices sequentially. Use Value: Maintains signal rise/fall times (<1 ns degradation) and avoids false triggering due to Cio < 5 pF per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBT16244DGGR | TSSOP-48 package (24.4 mm reel width, 70°C/W θJA), same electrical specs and pinout. | Better thermal performance in high-density layouts due to lower profile and improved heat spreading. | Select DGGR for space-constrained boards where 1.2 mm max height is mandatory and thermal dissipation exceeds DL limits. |
| SN74CBTD16211DLR | Includes integrated 25-Ω series termination resistors on all A/B pins; otherwise identical pinout and switching behavior. | Designed for point-to-point DDR or high-speed parallel bus interfaces requiring on-die termination to suppress reflections. | Choose CBTD16211DLR only when board-level trace impedance matching (50 Ω) is impractical and termination must be embedded. |
Compared with SN74CBT16244DGGR, SN74CBT16244DLR offers higher thermal resistance but wider tape width for robust pick-and-place handling; versus SN74CBTD16211DLR, it lacks built-in termination-requiring external resistors for reflection-sensitive links but offering greater flexibility in impedance tuning.
Availability
SN74CBT16244DLR is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral multiplexing, hot-swappable module interfaces, and test access point switching requiring stable component supply and long-term industrial availability.
Supply support for SN74CBT16244DLR 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 SN74CBT16244DLR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in 5 V TTL-compatible digital systems where timing predictability and signal integrity are critical.
FAQ
What is the maximum continuous current rating per channel for the SN74CBT16244DLR?
The SN74CBT16244DLR supports a continuous channel current of 128 mA per switch path, verified under absolute maximum ratings. This allows reliable operation at 30 mA typical load current with ≤7 Ω on-resistance, ensuring voltage drop stays below 210 mV even at worst-case ron and temperature extremes.
Does the SN74CBT16244DLR require external pull-up or pull-down resistors on its OE inputs?
No, the SN74CBT16244DLR OE inputs are TTL-compatible with defined VIH = 2 V and VIL = 0.8 V thresholds, and internal input structures do not require external biasing. However, TI recommends tying unused OE inputs directly to VCC or GND to prevent floating states that could cause unintended switching or increased ICC.
Can the SN74CBT16244DLR operate at 3.3 V supply voltage?
No - the SN74CBT16244DLR is specified only for 4 V to 5.5 V operation per recommended conditions. At 3.3 V, ron increases significantly (>20 Ω), tpd degrades beyond spec, and VIH/VIL thresholds become non-compliant, risking unreliable switching. For 3.3 V systems, consider TI's SN74CB3Q16244 or similar 3.3 V–optimized variants.
How does the SN74CBT16244DLR handle signal directionality between port A and port B?
The SN74CBT16244DLR provides fully bidirectional analog switching - signals flow equally well from A to B or B to A when OE is low. There is no internal direction control; direction is determined entirely by external driver/receiver placement, making it ideal for shared-bus architectures like memory data lines or JTAG daisy chains.
Is the SN74CBT16244DLR RoHS compliant and lead-free?
Yes - the SN74CBT16244DLR is RoHS compliant with NIPDAU (nickel-palladium-gold) lead finish, rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH), and qualified for peak reflow up to 260°C. Full compliance documentation, including material declarations and test reports, is available via TI's Quality & Environmental page.
SN74CBT16244DLR 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 Switch
- Circuit:
- 4 x 1:1
- Independent Circuits:
- 4
- 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
SN74CBT16244DLR FAQ
1.How can I place an order for SN74CBT16244DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16244DLR 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 SN74CBT16244DLR reliable?
The price and inventory of SN74CBT16244DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16244DLR is usually 5 days.
3.What payment methods are accepted for SN74CBT16244DLR?
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4.How is shipping managed for SN74CBT16244DLR?
SN74CBT16244DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16244DLR 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 SN74CBT16244DLR?
For technical support, including SN74CBT16244DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16244DLR requirements.
6.How does Aetrix verify that SN74CBT16244DLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16244DLR 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 SN74CBT16244DLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16244DLR?
All SN74CBT16244DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16244DLR, 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 SN74CBT16244DLR part is unused and in its original packaging.
Return procedure for SN74CBT16244DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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