My Inquiry
My Account
Texas Instruments SN74CBT16811CDLR
- Part No.:
- SN74CBT16811CDLR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74CBT16811CDLR.pdf
- Description:
- IC BUS SWITCH 12 X 1:1 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBT16811CDLR from Texas Instruments is a 24-channel FET bus switch IC organized as two independent 12-bit bidirectional switches, featuring 3 Ω typical ON-state resistance, −2 V undershoot protection on A/B ports, B-port precharge via BIASV pin, 0.15 ns propagation delay at 5 V, and support for 0–5-V signaling across mixed-voltage systems.
For engineers reviewing the SN74CBT16811CDLR datasheet, SN74CBT16811CDLR pinout, SN74CBT16811CDLR application, or SN74CBT16811CDLR equivalent, this device is selected for PCI hot-plug interfaces, memory interleaving paths, and live-insertion-critical bus isolation where signal integrity, low distortion, and partial-power-down capability are mandatory.
Technical Context
The SN74CBT16811CDLR implements dual 12-bit FET-based analog/digital bus switches with independent OE control (1OE/2OE), enabling either two isolated 12-bit channels or one consolidated 24-bit path. Each switch channel uses low-threshold MOSFETs to achieve near-zero propagation delay and minimal charge injection.
Its undershoot-protection circuitry actively monitors A/B port voltages down to −2 V and forces OFF-state isolation during fault events; simultaneously, the BIASV bias voltage (0–VCC) precharges B-port nodes through an internal ~10-kΩ equivalent resistor to suppress live-insertion glitches at receiver input thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - enables minimal voltage drop and signal attenuation in high-speed data paths. |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - supports sub-nanosecond timing-critical switching without added latency. |
| Undershoot protection limit | −2 V on A/B ports - prevents false triggering or latch-up during hot-plug transients. |
| I/O capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading and preserves edge integrity on shared buses. |
| VCC operating range | 4 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-supply systems. |
| BIASV voltage range | 0 V to VCC - allows precise matching to receiver input threshold (e.g., 2.4 V for 3.3-V LVTTL). |
| Ioff current | 10 µA max at VCC = 0 V - guarantees isolation and prevents backflow during partial power-down. |
| Signal voltage range | 0 V to 5.5 V on I/O pins - supports interoperability across 0.8-V to 5-V logic families without level shifters. |
Pinout & Package
SN74CBT16811CDLR is housed in a 56-pin TSSOP (DGG) package with 0.5-mm pitch, 13.9–14.1 mm length, 6.0–6.2 mm width, and 1.2 mm max height. Pin 1 is located in Quadrant Q1 per tape orientation standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Channel enable inputs | Active-low control: drives associated 12-bit switch ON (low) or OFF (high); OE high enables B-port precharge to BIASV. |
| BIASV | Bias supply input | User-configurable reference voltage (0–VCC) that sets precharge level for all B-port pins during OFF state. |
| 1A1–1A12, 2A1–2A12 | Input/output port A (channel 1 & 2) | Bidirectional data terminals connected directly to upstream logic or bus segments; support 0–5.5-V swing. |
| 1B1–1B12, 2B1–2B12 | Input/output port B (channel 1 & 2) | Bidirectional data terminals tied to downstream loads; internally precharged to BIASV when OE is high or VCC = 0. |
| VCC, GND (×4) | Power and ground | Distributed supply/return connections minimize IR drop and improve noise immunity across wide bus layout. |
Key Features
| Feature | Design Value |
|---|---|
| Live-insertion noise suppression | B-port precharge to user-defined BIASV minimizes glitch amplitude during card insertion/removal by avoiding receiver threshold crossing. |
| PCI Hot Plug compliance | Integrated undershoot protection (−2 V), Ioff isolation, and controlled turn-on/off timing meet PCI SIG hot-plug electrical requirements. |
| Mixed-voltage interface support | 0–5.5-V I/O tolerance and 4–5.5-V VCC operation allow direct connection between 1.2-V, 1.8-V, 2.5-V, 3.3-V, and 5-V domains. |
| Low-distortion analog switching | 3 Ω ron and 5.5 pF Cio(OFF) preserve signal fidelity for both digital edges and analog waveforms up to ~100 MHz. |
| Partial-power-down safety | Ioff ≤ 10 µA at VCC = 0 V prevents backdrive current into powered sections, enabling safe system-level power sequencing. |
Applications
| PCI Hot-Plug Interface | Memory Interleaving Path |
|---|---|
|
Use Scenario: Inserting/removing add-in cards into live 33-MHz or 66-MHz PCI slots without disrupting host bus operation. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from main bus; BIASV set to match PCI receiver threshold (~2.0 V). Use Value: Eliminates insertion-induced bus glitches by precharging B-port lines to avoid crossing receiver input thresholds during contact bounce. |
Use Scenario: Dynamically routing address/data between two DDR SDRAM banks under controller arbitration. IC Role / Device Role / Timing Role: Low-latency, low-capacitance signal gate enabling fast bank switching with <0.2 ns added delay. Use Value: Maintains tight setup/hold timing margins due to 3 Ω ron and 5.5 pF off-capacitance, preventing skew-induced read/write errors. |
| Backplane Bus Isolation | Legacy-to-Modern Logic Interface |
|
Use Scenario: Segmenting a shared 5-V parallel backplane to prevent fault propagation between modules. IC Role / Device Role / Timing Role: High-impedance isolation switch activated only during module communication; OE driven by local arbitration logic. Use Value: Achieves >10⁹ Ω isolation impedance when OFF, blocking DC leakage and reducing crosstalk-induced bit errors. |
Use Scenario: Connecting 3.3-V FPGA I/O to legacy 5-V peripheral ASICs without external level shifters. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional bridge supporting 0–5.5-V signal swing on both sides of the switch. Use Value: Enables direct interconnection while maintaining signal integrity and eliminating board space for discrete translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD16210DGGR | 24-bit switch with integrated 5-V tolerant level-shifting; higher ron (5 Ω typ); no BIASV pin. | Designed for level translation between 3.3-V and 5-V domains; lacks live-insertion precharge capability. | Select when voltage translation is required but BIASV-controlled glitch suppression is not critical. |
| SN74CBT3244ADW | Octal non-inverting switch (8-channel); smaller 20-pin SOIC package; same ron (3 Ω) and undershoot spec. | Targeted at compact, lower-channel-count applications; no BIASV or dual-OE architecture. | Select for space-constrained designs needing fewer channels and simpler enable control. |
Compared with SN74CBT16811CDLR, SN74CBTD16210DGGR adds level shifting at the cost of higher ON-resistance and no BIASV, while SN74CBT3244ADW offers identical ron and undershoot protection in a smaller 8-channel form factor-neither provides the 24-bit dual-OE + BIASV configuration essential for PCI hot-plug or memory interleaving.
Availability
SN74CBT16811CDLR is available at Aetrix Electronics and suitable for PCI interface design, memory subsystems, industrial backplanes, and mixed-voltage embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74CBT16811CDLR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.
The SN74CBT16811CDLR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for hot-plug-capable computing infrastructure, memory expansion, and robust signal gating in electrically noisy environments.
FAQ
What is the function of the BIASV pin on the SN74CBT16811CDLR?
The BIASV pin on the SN74CBT16811CDLR supplies a user-selectable bias voltage (0 V to VCC) used to precharge all B-port terminals when the associated OE is high or VCC is 0 V. This precharge minimizes live-insertion noise by holding B-port lines near the input threshold of downstream receivers, preventing transient-induced false logic transitions. The SN74CBT16811CDLR relies on this feature for PCI Hot Plug compliance and reliable hot-plug operation.
Does the SN74CBT16811CDLR support partial-power-down operation?
Yes, the SN74CBT16811CDLR supports partial-power-down operation via its Ioff feature. When VCC = 0 V, Ioff is limited to 10 µA maximum, preventing damaging backflow current from powered I/O lines into the unpowered device. This ensures safe isolation during power sequencing in multi-rail systems. The SN74CBT16811CDLR maintains high-impedance isolation even with VCC de-asserted, making it suitable for dynamic power management.
What is the maximum undershoot voltage the SN74CBT16811CDLR can tolerate on its A and B ports?
The SN74CBT16811CDLR tolerates undershoot down to −2 V on both A and B ports, enforced by active undershoot-protection circuitry that senses negative excursions and forces the switch into a guaranteed OFF state. This specification is verified per test condition VIKU at VCC = 5 V with II ≥ −50 mA. The SN74CBT16811CDLR uses this protection to prevent erroneous conduction or latch-up during hot-plug transients.
Can the SN74CBT16811CDLR be used for analog signal switching?
Yes, the SN74CBT16811CDLR is suitable for low-frequency analog signal switching due to its low 3 Ω ON-state resistance, 5.5 pF OFF-state capacitance, and flat ron vs. voltage profile. It preserves signal integrity for audio, sensor, or control signals up to ~100 MHz, provided voltage swing remains within 0–5.5 V and load current stays below ±128 mA. The SN74CBT16811CDLR's bidirectional nature and minimal charge injection further support analog use cases.
What package type and dimensions does the SN74CBT16811CDLR use?
The SN74CBT16811CDLR is packaged in a 56-pin TSSOP (DGG) with 0.5-mm pitch, overall dimensions of 13.9–14.1 mm × 6.0–6.2 mm, and maximum height of 1.2 mm. It is supplied in tape-and-reel format (2000 units/reel) with Q1 pin-1 quadrant orientation. The SN74CBT16811CDLR's DGG package meets JEDEC MO-153 standards and supports automated SMT assembly with standard reflow profiles (MSL Level-1).
SN74CBT16811CDLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 12 x 1:1
- Independent Circuits:
- 2
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74CBT16811CDLR FAQ
1.How can I place an order for SN74CBT16811CDLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT16811CDLR 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 SN74CBT16811CDLR reliable?
The price and inventory of SN74CBT16811CDLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT16811CDLR is usually 5 days.
3.What payment methods are accepted for SN74CBT16811CDLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT16811CDLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT16811CDLR?
SN74CBT16811CDLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT16811CDLR 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 SN74CBT16811CDLR?
For technical support, including SN74CBT16811CDLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT16811CDLR requirements.
6.How does Aetrix verify that SN74CBT16811CDLR is sourced from the original manufacturer or authorized distributors?
All SN74CBT16811CDLR 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 SN74CBT16811CDLR meets industry standards.
7.What is the process for return or replacement of SN74CBT16811CDLR?
All SN74CBT16811CDLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT16811CDLR, 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 SN74CBT16811CDLR part is unused and in its original packaging.
Return procedure for SN74CBT16811CDLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBT16811CDLR Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
