My Inquiry
My Account
Texas Instruments SN74CBT6800CDBR
- Part No.:
- SN74CBT6800CDBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74CBT6800CDBR.pdf
- Description:
- IC BUS SWITCH 10 X 1:1 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74CBT6800CDBR from Texas Instruments is a 10-bit bidirectional FET bus switch with TTL-compatible control, 3 Ω typical ON-state resistance, −2 V undershoot protection on A/B ports, B-port precharge via BIASV pin, and support for 0–5-V signaling across mixed-voltage systems. It enables hot-plug–capable PCI interface isolation in live-insertion backplane applications.
For engineers reviewing the SN74CBT6800CDBR datasheet, SN74CBT6800CDBR pinout, SN74CBT6800CDBR application, or SN74CBT6800CDBR equivalent, key selection criteria include live-insertion noise suppression via BIASV biasing, Ioff partial-power-down capability, sub-0.25 ns propagation delay, and SSOP-24 package compatibility with high-density PCB layouts.
Technical Context
This device implements a 10-channel, single-enable (ON) analog switch architecture using low-threshold NMOS FETs. Each channel provides bidirectional signal flow with near-zero RC delay due to 3 Ω ron and 5.5 pF off-state capacitance, enabling transparent data gating without timing skew.
The integrated undershoot-protection circuit actively clamps A/B port voltages down to −2 V during live insertion, while the BIASV terminal sources precharge current through an internal ~10-kΩ equivalent resistor-ensuring B-port voltage settles near receiver threshold before connector mating completes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ON-state resistance (ron) | 3 Ω typical - minimizes voltage drop and signal distortion at 64 mA per channel |
| Propagation delay (tpd) | 0.15 ns at VCC = 5 V - enables GHz-range digital signal pass-through without timing penalty |
| Off-state capacitance (Cio(OFF)) | 5.5 pF typical - reduces capacitive loading and crosstalk on isolated buses |
| Undershoot protection limit | −2 V on A/B ports - prevents false logic transitions during hot-plug transients |
| BIASV precharge function | Internal ~10-kΩ pull-up to user-supplied voltage - suppresses live-insertion glitches by holding B port near receiver VIL |
| Ioff partial-power-down | 10 µA max at VCC = 0 V - blocks backflow current when system rails are unpowered, protecting upstream drivers |
| VCC operating range | 4 V to 5.5 V - supports legacy 5-V TTL and mixed-signal environments with margin |
| Data I/O voltage range | 0 V to 5.5 V - interoperates with 0.8-V to 5-V logic families without level shifters |
Pinout & Package
SN74CBT6800CDBR is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.9 mm × 4.4 mm body, and 1.2 mm max height - optimized for automated assembly and thermal performance (θJA = 63°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A10 | Input/Output port A | 10-bit bidirectional data path; electrically identical to B port; supports undershoot clamping |
| B1–B10 | Input/Output port B | 10-bit bidirectional data path; internally precharged to BIASV when switch is OFF or VCC = 0 V |
| ON | Active-low enable input | Drives switch ON (low) or OFF (high); requires pullup to VCC during power sequencing |
| BIASV | Bias supply input | User-supplied voltage (0–VCC) that sets precharge level for B port; critical for live-insertion noise reduction |
| VCC | Power supply | 4 V–5.5 V main supply; powers internal protection circuitry and switch FETs |
| GND | Ground reference | Common return for VCC, BIASV, and all I/O signals; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Live-insertion noise suppression | BIASV-controlled B-port precharge eliminates glitching during card mating by holding voltage outside receiver input threshold region |
| Hot-plug–ready undershoot protection | Dedicated sensing circuit maintains OFF state during −2 V transients on A/B ports - no external diodes required |
| Mixed-voltage signal transparency | 0–5.5 V I/O tolerance allows direct interfacing between 1.2-V, 1.8-V, 2.5-V, 3.3-V, and 5-V domains without level translation |
| Partial-power-down safety | Ioff limits reverse current to 10 µA when VCC = 0 V - prevents damage to powered subsystems during rail sequencing |
| Ultra-low signal distortion | 3 Ω ron + 5.5 pF Cio(OFF) yields <0.25 ns propagation delay and minimal rise/fall time degradation |
Applications
| PCI Hot-Plug Backplanes | Memory Interleaving Interfaces |
|---|---|
|
Use Scenario: Inserting/removing expansion cards into active PCI slots without disrupting bus operation. IC Role / Device Role / Timing Role: Bidirectional bus switch isolating card-side signals from main bus; BIASV set to 1.4 V to match PCI-X receiver thresholds. Use Value: Eliminates insertion-induced glitches by precharging B port to avoid crossing input threshold region - verified per JESD22-A114B ESD testing. |
Use Scenario: Dynamically routing memory address/data lines between two DRAM banks controlled by separate controllers. IC Role / Device Role / Timing Role: Low-latency signal gate enabling bank-select arbitration with sub-0.25 ns delay and no added skew. Use Value: Maintains tight tAC/tCO timing budgets across interleaved channels due to matched ron and Cio across all 10 bits. |
| Industrial I/O Module Isolation | Legacy System Voltage Translation |
|
Use Scenario: Protecting programmable logic controller (PLC) backplane from field-wiring transients during module replacement. IC Role / Device Role / Timing Role: Bus isolation switch with Ioff and −2 V undershoot protection - ensures safe hot-swap under noisy industrial conditions. Use Value: Latch-up immunity >100 mA (JESD78 Class II) and 2000-V HBM ESD rating prevent field failures during maintenance. |
Use Scenario: Interfacing a 3.3-V microcontroller GPIO bank to a 5-V sensor bus without discrete level shifters. IC Role / Device Role / Timing Role: Passive bidirectional voltage-tolerant switch - leverages 0–5.5 V I/O range and TTL-compatible ON input. Use Value: Reduces BOM count and layout area versus discrete MOSFET solutions while preserving signal integrity up to 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTD6800CDBR | Includes 3-state outputs and higher drive strength (±128 mA), but lacks BIASV precharge and undershoot protection | Suitable for static bus isolation where live insertion is not required | Choose when higher current drive is needed and hot-plug immunity is unnecessary |
| SN74LVC1G3157DBVR | Single-pole double-throw (SPDT) switch; 5-V tolerant I/O; no BIASV or undershoot protection; 6 Ω ron | Applicable only for point-to-point signal routing, not 10-bit parallel bus isolation | Select for low-pin-count, low-cost signal switching - not for multi-bit hot-plug interfaces |
Compared with SN74CBT6800CDBR, SN74CBTD6800CDBR trades live-insertion robustness for higher drive capability, while SN74LVC1G3157DBVR offers cost-efficient SPDT switching but cannot replace 10-bit parallel isolation - making SN74CBT6800CDBR uniquely suited for PCI-compliant hot-plug systems requiring simultaneous multi-line precharge and transient protection.
Availability
SN74CBT6800CDBR is available at Aetrix Electronics and suitable for PCI hot-plug backplanes, memory interleaving subsystems, industrial I/O modules, and legacy voltage-translation interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SN74CBT6800CDBR 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 decades of expertise in high-reliability interface ICs.
SN74CBT6800CDBR belongs to TI's Widebus™ family of high-speed bus switches, engineered specifically for hot-plug–enabled computing and industrial backplane architectures demanding robust signal integrity and live-insertion safety.
FAQ
What is the maximum undershoot voltage the SN74CBT6800CDBR can withstand on its A and B ports?
The SN74CBT6800CDBR provides active undershoot protection up to −2 V on both A and B ports, as confirmed in the absolute maximum ratings and functional description. This protection operates independently of VCC status and ensures the switch remains in the OFF state during transient events, preventing false logic transitions in live-insertion scenarios. The SN74CBT6800CDBR achieves this via dedicated internal sensing circuitry, eliminating need for external clamp diodes.
How does the BIASV pin function in the SN74CBT6800CDBR, and what voltage should it be set to?
The BIASV pin on the SN74CBT6800CDBR supplies a user-defined bias voltage (0 V to VCC) that precharges the B port through an internal ~10-kΩ equivalent resistor when the switch is OFF or VCC = 0 V. For PCI hot-plug applications, BIASV is typically set to 1.4 V to align with receiver input threshold levels and prevent live-insertion glitches. The SN74CBT6800CDBR datasheet specifies BIASV must remain within 0–VCC and recommends stable decoupling for noise immunity.
Does the SN74CBT6800CDBR support partial-power-down operation, and how is it implemented?
Yes, the SN74CBT6800CDBR supports partial-power-down via its Ioff feature, which limits reverse current to 10 µA maximum when VCC = 0 V and I/O voltages range from 0 V to 5.5 V. This prevents damaging backflow current from powered subsystems into the unpowered SN74CBT6800CDBR, ensuring safe operation during rail sequencing or standby modes. The Ioff specification is validated per JEDEC JESD78 Class II latch-up testing.
What is the typical ON-state resistance of the SN74CBT6800CDBR, and how does it affect signal integrity?
The SN74CBT6800CDBR has a typical ON-state resistance (ron) of 3 Ω at VCC = 4.5 V and IO = 30 mA, with a maximum of 6 Ω across temperature and voltage ranges. This low ron minimizes voltage drop and signal attenuation - for example, a 64 mA signal experiences only ~192 mV drop - preserving logic margins and reducing timing skew across all 10 channels. The SN74CBT6800CDBR's matched ron ensures consistent delay and amplitude response across parallel data paths.
Can the SN74CBT6800CDBR interface between different logic voltage domains, and what are its I/O voltage limits?
Yes, the SN74CBT6800CDBR supports 0 V to 5.5 V signaling on all A and B port pins, enabling seamless interfacing between 0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, and 5-V logic families without external level shifters. Its control inputs accept TTL or 5-V/3.3-V CMOS levels, and the SN74CBT6800CDBR maintains full functionality across the entire VCC range (4 V–5.5 V), making it ideal for mixed-voltage system interconnects.
SN74CBT6800CDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 10 x 1:1
- Independent Circuits:
- 1
- 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:
- 24-SSOP
SN74CBT6800CDBR FAQ
1.How can I place an order for SN74CBT6800CDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBT6800CDBR 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 SN74CBT6800CDBR reliable?
The price and inventory of SN74CBT6800CDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBT6800CDBR is usually 5 days.
3.What payment methods are accepted for SN74CBT6800CDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBT6800CDBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74CBT6800CDBR?
SN74CBT6800CDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBT6800CDBR 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 SN74CBT6800CDBR?
For technical support, including SN74CBT6800CDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBT6800CDBR requirements.
6.How does Aetrix verify that SN74CBT6800CDBR is sourced from the original manufacturer or authorized distributors?
All SN74CBT6800CDBR 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 SN74CBT6800CDBR meets industry standards.
7.What is the process for return or replacement of SN74CBT6800CDBR?
All SN74CBT6800CDBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBT6800CDBR, 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 SN74CBT6800CDBR part is unused and in its original packaging.
Return procedure for SN74CBT6800CDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74CBT6800CDBR 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…
