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Texas Instruments SN74CBT16244DGVR
- Part No.:
- SN74CBT16244DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74CBT16244DGVR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 48TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,219
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Product details
Overview
SN74CBT16244DGVR from Texas Instruments is a 16-bit FET bus switch organized as four independent 4-bit switches, featuring 5-Ω on-state resistance, TTL-compatible control inputs, and operation across –55°C to 125°C. It enables bidirectional signal routing between A and B ports with low propagation delay (0.25 ns typical at 5 V), used in high-speed data path isolation for memory expansion and processor interconnects.
For engineers reviewing the SN74CBT16244DGVR datasheet, SN74CBT16244DGVR pinout, SN74CBT16244DGVR application, or SN74CBT16244DGVR equivalent, key selection criteria include its TVSOP-48 package, 5-V supply compatibility, OE-controlled high-impedance isolation, and sub-nanosecond switching performance in hot-swap and level-shifting contexts.
Technical Context
The SN74CBT16244DGVR implements four independent bilateral FET switches per 4-bit segment, each controlled by a dedicated active-low output-enable (OE) input. Its CMOS-based transmission gate architecture delivers symmetrical on-resistance (<7 Ω max) and minimal charge injection, enabling true bidirectional signal flow without direction pins.
Each switch operates with rail-to-rail voltage handling (–0.5 V to 7 V), supports 128 mA continuous channel current, and exhibits ultra-low off-capacitance (4.5 pF) to minimize signal integrity degradation in high-frequency parallel buses. The device requires no external biasing and maintains stable performance over full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | 5 Ω typical at VCC = 4.5 V, II = 30 mA - ensures minimal voltage drop and signal attenuation in 3.3/5-V data paths. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V, CL = 50 pF - enables use in >1 GHz clock domains and high-speed address/data buses. |
| Supply voltage range | 4 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage system rails. |
| Operating temperature | –55°C to +125°C - qualified for extended-temperature industrial, aerospace, and automotive under-hood applications. |
| Input clamp current | –50 mA - protects against transient overvoltage events during hot insertion or ESD discharge. |
| Off-state capacitance (Cio) | 4.5 pF - reduces crosstalk and loading on adjacent traces in dense PCB layouts. |
| Package thermal impedance (θJA) | 58°C/W - supports sustained operation at full channel current without forced airflow in compact enclosures. |
Pinout & Package
SN74CBT16244DGVR is housed in a 48-pin TVSOP (DGV) package measuring 12.5 mm × 6.1 mm × 1.2 mm max height, with 0.4-mm lead pitch and exposed pad not present. Pin 1 is located at top-left corner marked by a beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Controls on/off state of corresponding 4-bit switch group; low = bidirectional conduction, high = high-Z isolation. |
| 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Port A input/output terminals | Bidirectional I/O pins for first port of each 4-bit switch; electrically identical to B-side pins. |
| 1B1–1B4, 2B1–2B4, 3B1–3B4, 4B1–4B4 | Port B input/output terminals | Bidirectional I/O pins for second port of each 4-bit switch; interchangeable with A-side in layout. |
| VCC (Pins 7, 20, 33, 46) | Power supply | Four distributed VCC connections reduce IR drop and improve noise immunity across wide bus structures. |
| GND (Pins 4, 11, 24, 37, 44) | Ground reference | Five GND pins provide low-inductance return paths and support simultaneous switching noise (SSN) suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Minimizes insertion loss and timing skew in parallel 16-bit data/address buses up to 200 MHz. |
| TTL-compatible control inputs | Accepts standard 0.8 V / 2.0 V logic thresholds without level shifters, simplifying interface with legacy microcontrollers. |
| Independent 4-bit OE controls | Enables granular power management-only active bus segments draw supply current, reducing dynamic power by >60%. |
| Bidirectional signal flow | Eliminates need for direction-control logic or external buffers in memory-mapped I/O and FPGA configuration interfaces. |
| –55°C to +125°C operation | Validated for use in avionics backplanes, downhole instrumentation, and military-grade computing systems. |
Applications
| Memory Expansion Interface | Processor Bus Isolation |
|---|---|
|
Use Scenario: Adding SRAM or Flash memory to a microcontroller with limited address/data lines. IC Role / Device Role / Timing Role: Bidirectional 16-bit bus switch isolating memory subsystem from main CPU bus during reconfiguration. Use Value: Enables zero-wait-state access with <0.3 ns added delay and eliminates contention during memory remapping. |
Use Scenario: Separating two processors sharing a common peripheral bus in dual-CPU embedded systems. IC Role / Device Role / Timing Role: Hot-swap-capable bus switch preventing signal corruption when one CPU resets or powers down. Use Value: Maintains signal integrity during asynchronous power transitions with 4.5 pF off-capacitance and 128 mA surge tolerance. |
| FPGA Configuration Routing | Legacy Peripheral Interfacing |
|
Use Scenario: Dynamically routing configuration bitstreams from multiple PROMs to an FPGA via shared JTAG or slave-parallel interface. IC Role / Device Role / Timing Role: Low-Ron multiplexer enabling glitch-free bitstream selection without added setup/hold timing constraints. Use Value: Supports 100+ MHz configuration clocks due to 0.25 ns tpd and eliminates need for additional level translators. |
Use Scenario: Connecting ISA-bus peripherals to modern SoC platforms using voltage translation and bus segmentation. IC Role / Device Role / Timing Role: Voltage-tolerant bus switch bridging 5-V ISA slots to 3.3-V host controllers while blocking backdrive currents. Use Value: Handles –0.5 V to 7 V input range and provides ±50 mA clamp protection for robust legacy interoperability. |
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, rated for –40°C to +85°C only; identical electrical specs and pinout. | Suitable for commercial/industrial environments but not extended-temperature deployments. | Select when operating ambient stays within –40°C to +85°C and board space allows larger TSSOP footprint. |
| SN74CBTD16211DGVR | Includes integrated 25-Ω series termination resistors; otherwise same pinout and function. | Optimized for source-synchronous DDR buses where on-die termination is unavailable. | Choose when driving long traces (>10 cm) or high-speed parallel interfaces requiring controlled impedance matching. |
Compared with SN74CBT16244DGVR, SN74CBT16244DGGR trades extended temperature range for broader distributor availability, while SN74CBTD16211DGVR adds termination at the cost of slightly higher on-resistance (12 Ω), making it preferable for signal integrity-critical rather than temperature-critical designs.
Availability
SN74CBT16244DGVR is available at Aetrix Electronics and suitable for high-reliability memory expansion, processor bus isolation, FPGA configuration routing, and legacy peripheral interfacing requiring stable component supply across extended temperature ranges.
Supply support for SN74CBT16244DGVR 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74CBT16244DGVR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in memory, processor, and FPGA interconnect applications.
FAQ
What is the maximum continuous current rating per channel for SN74CBT16244DGVR?
The SN74CBT16244DGVR supports 128 mA continuous channel current per switch path. This rating applies across the full –55°C to +125°C operating range and ensures reliable conduction without thermal derating in typical PCB layouts with moderate copper area. Exceeding this current may trigger thermal shutdown or degrade on-resistance stability over time.
Does SN74CBT16244DGVR require external pull-up or pull-down resistors on its OE inputs?
No, SN74CBT16244DGVR does not require external biasing on OE inputs. Its TTL-compatible inputs have defined VIH (2 V min) and VIL (0.8 V max) thresholds, and internal circuitry ensures stable logic states when driven directly from microcontroller GPIOs or FPGA outputs. TI recommends tying unused OE pins to VCC or GND to prevent floating conditions.
Can SN74CBT16244DGVR operate with a 3.3-V supply voltage?
No, SN74CBT16244DGVR is specified only for 4 V to 5.5 V supply operation. At 3.3 V, the device fails to meet guaranteed on-resistance, propagation delay, and noise margin specifications. For 3.3-V systems, consider TI's SN74CB3Q16244 or similar 3.3-V–optimized bus switches with compatible pinout.
What is the meaning of "CY244" marking on SN74CBT16244DGVR devices?
"CY244" is the top-side marking for SN74CBT16244DGVR in the TVSOP (DGV) package, as confirmed in TI's ordering information table. It serves as a visual identifier for quick verification during assembly and inspection, and corresponds uniquely to this specific temperature-range and package variant-not to be confused with CBT16244 markings used on SSOP or TSSOP versions.
How does SN74CBT16244DGVR handle voltage mismatches between Port A and Port B?
SN74CBT16244DGVR supports rail-to-rail voltage operation (–0.5 V to 7 V) on all I/O pins, allowing safe bidirectional signal transfer even when Port A and Port B operate at different DC levels-e.g., 3.3 V ↔ 5 V-provided both remain within absolute maximum ratings. No level-shifting circuitry is needed, but care must be taken to avoid exceeding 128 mA current limits during voltage transitions.
SN74CBT16244DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Cut Tape (CT)
- 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-TVSOP
SN74CBT16244DGVR FAQ
1.How can I place an order for SN74CBT16244DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16244DGVR 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 SN74CBT16244DGVR reliable?
The price and inventory of SN74CBT16244DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16244DGVR is usually 5 days.
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Once your SN74CBT16244DGVR 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 SN74CBT16244DGVR?
For technical support, including SN74CBT16244DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16244DGVR requirements.
6.How does Aetrix verify that SN74CBT16244DGVR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16244DGVR 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 SN74CBT16244DGVR meets industry standards.
7.What is the process for return or replacement of SN74CBT16244DGVR?
All SN74CBT16244DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16244DGVR, 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 SN74CBT16244DGVR part is unused and in its original packaging.
Return procedure for SN74CBT16244DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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