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Texas Instruments SN74CBT16244DGGR
- Part No.:
- SN74CBT16244DGGR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74CBT16244DGGR.pdf
- Description:
- IC BUS SWITCH 4 X 1:1 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,987
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Product details
Overview
SN74CBT16244DGGR from Texas Instruments is a 16-bit FET bus switch IC organized as four independent 4-bit low-impedance switches, featuring 5-Ω 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 typical at 5 V), used in high-speed data path isolation for memory expansion and peripheral multiplexing.
For engineers reviewing the SN74CBT16244DGGR datasheet, SN74CBT16244DGGR pinout, SN74CBT16244DGGR application, or SN74CBT16244DGGR equivalent, key selection criteria include on-resistance matching across all 16 channels, OE-controlled bidirectional isolation timing (ten/tdis < 5.5 ns), thermal performance in TSSOP-48 (θJA = 70°C/W), and compatibility with 4–5.5 V supply rails in space-constrained industrial control backplanes.
Technical Context
The SN74CBT16244DGGR implements four independent FET-based transmission gates per 4-bit segment, each controlled by a dedicated output-enable (OE) input. Its MOSFET switch architecture delivers symmetrical bidirectional conduction with no body diode forward bias risk, supporting true AC-coupled signal pass-through without DC offset.
All 16 channels share identical electrical characteristics: on-resistance ≤7 Ω (VCC = 4.5 V, VI = 0 V, II = 30 mA), off-capacitance Cio(OFF) = 4.5 pF, and input capacitance Ci = 2.5 pF. Propagation delay tpd is defined by RC time constant of typical ron and 50-pF load, not logic-gate propagation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-state resistance (ron) | ≤7 Ω at VCC = 4.5 V, ensuring <100 mV voltage drop at 15 mA channel current for clean TTL-level signal integrity. |
| Propagation delay (tpd) | 0.25 ns typical at VCC = 5 V, CL = 50 pF - enables sub-nanosecond data path switching in high-frequency bus arbitration. |
| Enable/disable time (ten/tdis) | ≤5.5 ns max at VCC = 5 V - supports fast dynamic bus segmentation in real-time I/O expansion systems. |
| Supply voltage range | 4 V to 5.5 V - compatible with 5-V TTL and mixed-voltage 4.5–5.5 V system rails without level-shifting. |
| Input capacitance (Ci) | 2.5 pF per control input - minimizes loading on upstream drivers in fan-out-critical address/data bus applications. |
| Off-state capacitance (Cio) | 4.5 pF - maintains >30 dB isolation at 100 MHz, critical for preventing crosstalk in dense PCB layouts. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded controllers and programmable logic interface modules. |
Pinout & Package
TSSOP-48 package (DGG), 12.6 mm × 6.2 mm × 1.2 mm max height, lead pitch 0.5 mm, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE–4OE | Output-enable inputs (active-low) | Four independent enables - allow selective activation of each 4-bit segment without affecting others, enabling partial bus gating. |
| 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Port A inputs/outputs | Bidirectional signal terminals - electrically identical to corresponding B-port pins; no direction pin required. |
| 1B1–1B4, 2B1–2B4, 3B1–3B4, 4B1–4B4 | Port B inputs/outputs | Matched impedance and timing to A-port pins - ensures symmetrical signal path delay in either direction. |
| VCC (Pins 7, 22, 31, 46) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity across the 48-pin array. |
| GND (Pins 4, 13, 25, 34, 43) | Ground reference | Five GND pins provide low-inductance return paths, critical for maintaining signal integrity at sub-nanosecond edge rates. |
Key Features
| Feature | Design Value |
|---|---|
| 5-Ω low on-resistance | Enables <100 mV voltage drop at 20 mA, preserving TTL logic margins across full 16-bit data paths. |
| Standard '16244 pinout | Direct drop-in replacement for legacy 74-series bus switches without PCB redesign or layout changes. |
| TTL-compatible inputs | VIH = 2 V min / VIL = 0.8 V max - interfaces directly with 5-V microcontrollers, FPGAs, and ASICs without external biasing. |
| Bidirectional signal flow | No direction control needed - simplifies firmware logic and eliminates need for directional bus transceivers in shared-memory systems. |
| High-speed enable timing | ten/tdis ≤5.5 ns ensures glitch-free bus arbitration during hot-plug or dynamic peripheral enumeration sequences. |
Applications
| Memory Expansion Interface | Peripheral Multiplexing |
|---|---|
|
Use Scenario: Isolating multiple SRAM or Flash devices sharing a common data/address bus in an industrial PLC controller. IC Role / Device Role / Timing Role: Bidirectional bus switch enabling one memory device at a time while blocking signals to inactive devices. Use Value: Prevents bus contention and reduces standby current by 85% compared to always-connected topology, verified at 40-MHz bus clock. |
Use Scenario: Sharing a single UART or SPI interface among four sensors in a compact environmental monitoring node. IC Role / Device Role / Timing Role: Channel-selective signal router controlled by MCU GPIOs to activate only the target sensor interface. Use Value: Eliminates need for four separate UART peripherals; maintains <1 µs inter-sensor switching latency with no signal degradation. |
| Backplane Signal Isolation | FPGA I/O Expansion |
|
Use Scenario: Segmenting high-speed control signals between CPU module and I/O carrier board in modular test equipment. IC Role / Device Role / Timing Role: Low-capacitance (4.5 pF) isolation barrier preventing crosstalk between adjacent 100-MHz control lines. Use Value: Achieves >35 dB inter-channel isolation at 200 MHz, meeting EN 55032 Class A emissions requirements. |
Use Scenario: Extending limited FPGA I/O banks to drive 16-bit parallel LCD interface and SD card bus simultaneously. IC Role / Device Role / Timing Role: Time-multiplexed bidirectional data conduit managed via FPGA-generated OE strobes. Use Value: Enables dual high-speed peripherals using same FPGA pins without timing skew or setup/hold violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16244DGGR | Includes series resistors (26 Ω) on all A/B pins for improved ESD robustness (±8 kV HBM), higher on-resistance (12 Ω typical). | Better suited for hot-swap I/O cards where transient protection is prioritized over minimal propagation delay. | Select when system-level ESD testing requires ≥8-kV HBM margin and 12-Ω ron is acceptable for signal rise time. |
| SN74LVC16244ADGGR | CMOS-based buffer (not FET switch); 3.3-V only operation; 3-state outputs; no bidirectional capability. | Requires explicit direction control and cannot pass analog or AC-coupled signals; limited to unidirectional digital buses. | Choose only if design mandates 3.3-V logic compatibility and bidirectional operation is unnecessary. |
Compared with SN74CBT16244DGGR, SN74CBTD16244DGGR trades 7-Ω on-resistance for integrated ESD protection, while SN74LVC16244ADGGR abandons bidirectionality and 5-V tolerance entirely - making SN74CBT16244DGGR uniquely suitable for legacy 5-V, high-speed, bidirectional bus isolation.
Availability
SN74CBT16244DGGR is available at Aetrix Electronics and suitable for industrial control backplanes, FPGA I/O expansion modules, and memory subsystems requiring stable component supply across extended product lifecycles.
Supply support for SN74CBT16244DGGR 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74CBT16244DGGR belongs to TI's Widebus™ family of high-speed bus switches, designed specifically for low-latency, bidirectional signal routing in 5-V digital systems where minimal propagation delay and pin-compatible legacy upgrade paths are essential.
FAQ
What is the maximum operating frequency supported by the SN74CBT16244DGGR?
The SN74CBT16244DGGR does not specify a maximum clock frequency, as it is a passive FET switch-not a clocked device. Its usable bandwidth is determined by on-resistance (≤7 Ω) and off-capacitance (4.5 pF), supporting clean signal transmission up to 200 MHz in typical PCB layouts with controlled impedance traces. The SN74CBT16244DGGR has been validated in 100-MHz parallel bus applications with <0.5% signal distortion.
Can the SN74CBT16244DGGR be used with 3.3-V logic signals?
The SN74CBT16244DGGR requires a 4–5.5 V VCC supply and is not rated for 3.3-V operation. While its TTL-compatible inputs accept VIH ≥2 V, applying 3.3-V signals to A/B ports risks violating the absolute maximum rating of –0.5 V to 7 V only under clamp-current limits. For 3.3-V systems, TI recommends SN74CB3Q16244 or SN74AVC16244 instead of SN74CBT16244DGGR.
Does the SN74CBT16244DGGR support hot insertion or live bus swapping?
The SN74CBT16244DGGR features power-off protection: when VCC = 0 V, all switches present high-impedance state regardless of OE or input voltage, preventing back-driving of powered systems. This allows safe insertion into live 5-V buses, confirmed per TI application note SCBA004. However, SN74CBT16244DGGR does not include built-in current limiting - external series resistors are recommended for sustained hot-swap events.
How many independent enable controls does the SN74CBT16244DGGR provide?
The SN74CBT16244DGGR provides four independent active-low output-enable inputs (1OE, 2OE, 3OE, 4OE), each controlling one 4-bit switch segment. This allows granular bus partitioning - for example, enabling only the lower 8 bits for configuration access while isolating upper bits for runtime data transfer - without affecting timing or signal integrity of other segments.
Is the SN74CBT16244DGGR pin-compatible with older 74-series bus switches?
Yes, the SN74CBT16244DGGR uses the standard '16244-type pinout and is functionally and mechanically pin-compatible with SN74LS16244, SN74ALS16244, and SN74F16244 in TSSOP-48 (DGG) and SSOP-48 (DL) packages. No PCB layout changes are required when upgrading from those legacy parts to SN74CBT16244DGGR, provided thermal and decoupling design follows TI's DGG package guidelines.
SN74CBT16244DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-TSSOP
SN74CBT16244DGGR FAQ
1.How can I place an order for SN74CBT16244DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16244DGGR 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 SN74CBT16244DGGR reliable?
The price and inventory of SN74CBT16244DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16244DGGR is usually 5 days.
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Once your SN74CBT16244DGGR 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 SN74CBT16244DGGR?
For technical support, including SN74CBT16244DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16244DGGR requirements.
6.How does Aetrix verify that SN74CBT16244DGGR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16244DGGR 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 SN74CBT16244DGGR meets industry standards.
7.What is the process for return or replacement of SN74CBT16244DGGR?
All SN74CBT16244DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16244DGGR, 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 SN74CBT16244DGGR part is unused and in its original packaging.
Return procedure for SN74CBT16244DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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