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Texas Instruments SN74CB3Q32245ZKER
- Part No.:
- SN74CB3Q32245ZKER
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 96-LFBGA
- Datasheet:
-
SN74CB3Q32245ZKER.pdf
- Description:
- IC BUS SW 8X1:1 96PBGA MICROSTAR
- Quantity:
- Payment:
- Shipping:
Inventory:3,030
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Product details
Overview
SN74CB3Q32245ZKER from Texas Instruments is a 32-bit high-bandwidth FET bus switch organized as four independent 8-bit bidirectional switches, featuring 5-V-tolerant I/Os, rail-to-rail switching (0–5 V with 3.3-V VCC), typical ON-state resistance of 5 Ω, and 4 pF OFF-state I/O capacitance - deployed in PCI interface and memory interleaving systems.
For engineers reviewing the SN74CB3Q32245ZKER datasheet, SN74CB3Q32245ZKER pinout, SN74CB3Q32245ZKER application, or SN74CB3Q32245ZKER equivalent, key selection criteria include partial-power-down support (Ioff), flat ron over voltage range, sub-0.3 ns propagation delay, and LFBGA-ZKE package compatibility with high-density routing.
Technical Context
The SN74CB3Q32245ZKER implements charge-pump-enhanced FET switches to maintain low, flat ON-state resistance across 0–5-V signal swing and 2.3–3.6-V VCC range. Each of its four 8-bit sections operates independently via dedicated OE inputs (1OE–4OE), enabling configurable 8/16/32-bit bus isolation.
It supports bidirectional signal flow with near-zero propagation delay (0.18 ns min at 2.5 V), 20 MHz max OE switching frequency, and Ioff-enabled backflow protection during partial power-down - critical for hot-swap and mixed-voltage system interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables operation in 2.5-V and 3.3-V logic domains without level shifters. |
| ron (Typ) | 5 Ω - ensures minimal voltage drop and signal distortion under ±64 mA load current. |
| Cio(OFF) (Typ) | 4 pF - reduces capacitive loading on high-speed buses, preserving signal integrity up to 500 MHz. |
| tpd (Min) | 0.18 ns - delivers near-instantaneous bidirectional data pass-through for timing-critical interconnects. |
| Ioff (Max) | 1 µA at VCC = 0 - guarantees isolation and prevents damaging current flow during power-down sequences. |
| VI/O Range | 0 V to 5.5 V - supports mixed-voltage signaling (0.8 V to 5 V) while powered at 2.5 V or 3.3 V. |
| fOE (Max) | 20 MHz - defines maximum toggle rate of output-enable control for dynamic bus gating. |
Pinout & Package
LFBGA-144 (ZKE package, 10 mm × 10 mm, 0.8 mm pitch), lead-free, bottom-side thermal pad, JEDEC MO-275 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 1B1–1B8 | Data I/O Port A/B (Section 1) | Bidirectional signal path for first 8-bit bus; rail-to-rail compatible (0–5 V). |
| 1OE | Output Enable (Section 1) | Active-low control: drives section into high-Z when high; ties to VCC via pullup for power-up safety. |
| 2A1–2A8, 2B1–2B8 | Data I/O Port A/B (Section 2) | Independent 8-bit path with identical electrical specs and isolation from Section 1. |
| 2OE | Output Enable (Section 2) | Decouples Section 2 without affecting other sections - enables granular bus partitioning. |
| VCC (Multiple Pins) | Supply Voltage | Distributed power pins minimize IR drop and noise coupling across 32-bit switch array. |
| GND (Multiple Pins) | Ground Reference | Multiple low-inductance ground connections ensure stable reference for high-speed switching. |
| NC | No Internal Connection | Unbonded pads (e.g., Pins A3, H10, J1, T3) - must remain unconnected per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail signal switching | Supports 0–5-V signals with 3.3-V VCC or 0–3.3-V signals with 2.5-V VCC - eliminates external level translators in mixed-voltage systems. |
| Charge-pump gate drive | Elevates FET gate voltage to ensure low, flat ron across full VI/O range - maintains signal fidelity at 500-MHz bandwidth. |
| Ioff partial-power-down | Blocks reverse current flow when VCC = 0 and VI/O = 0–5.5 V - enables safe hot-plug operation in modular backplanes. |
| Undershoot clamp diodes | Integrated clamps on all data and control inputs protect against −1.8 V undershoot - improves robustness in noisy PCB environments. |
| Low dynamic power | 0.15–0.25 mA/MHz per control input - minimizes switching-induced supply noise in multi-switch configurations. |
Applications
| PCI Interface | Differential Signal Interface |
|---|---|
Use Scenario: Isolating legacy PCI slots from shared address/data bus during hot-swap insertion. IC Role / Device Role / Timing Role: Bidirectional 32-bit bus switch enabling zero-latency signal pass-through or high-Z isolation under OE control. Use Value: Eliminates bus contention during card insertion/removal while maintaining <0.3 ns propagation delay for timing-critical transactions. |
Use Scenario: Gating LVDS or RSDS differential pairs in programmable interconnect matrices. IC Role / Device Role / Timing Role: Low-capacitance (4 pF), low-ron (5 Ω) analog switch preserving differential signal symmetry and edge rate. Use Value: Prevents skew and jitter accumulation across multiple switch stages in high-speed serial link reconfiguration paths. |
| Memory Interleaving | Bus Isolation |
Use Scenario: Dynamically routing DDR2/DDR3 command/address lines between dual memory controllers. IC Role / Device Role / Timing Role: Four independent 8-bit switches configured as two 16-bit paths for parallel address bus segmentation. Use Value: Enables real-time memory controller failover with no added setup/hold timing margin degradation. |
Use Scenario: Isolating test instrumentation from production bus during in-system debug or firmware update. IC Role / Device Role / Timing Role: High-impedance state (IOZ ≤ ±1 µA) activated by OE to decouple DUT from probe logic analyzers. Use Value: Prevents loading-induced signal corruption and ensures measurement accuracy during live bus monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-bandwidth bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV32245RKR | Lower VCC range (2.3–3.6 V same), but ron = 6 Ω typ, Cio(OFF) = 5 pF, no charge pump - higher ron variation vs VI/O. | Suitable for cost-sensitive 3.3-V-only systems where 5-V tolerance is not required. | Prefer SN74CB3Q32245ZKER when 0–5-V rail-to-rail switching or <5 pF OFF capacitance is mandatory. |
| PI3CH485ZDE | 48-pin TSSOP, 32-bit, ron = 7 Ω typ, Cio(OFF) = 6 pF, supports 1.8–5.5-V VI/O but requires 3.3-V VCC only. | Offers smaller footprint and simpler layout but lacks Ioff and undershoot clamps. | Choose SN74CB3Q32245ZKER for partial-power-down safety and robust ESD/undershoot protection in industrial backplanes. |
Compared with SN74CBTLV32245RKR and PI3CH485ZDE, the SN74CB3Q32245ZKER delivers superior 5-V-tolerant rail-to-rail operation, lower OFF capacitance, and integrated Ioff protection - making it optimal for mixed-voltage, hot-swap, and high-fidelity signal gating applications.
Availability
SN74CB3Q32245ZKER is available at Aetrix Electronics and suitable for PCI interface, memory interleaving, differential signal routing, and bus isolation applications requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for SN74CB3Q32245ZKER 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 decades of innovation in high-speed interface and signal-integrity technologies.
The SN74CB3Q32245ZKER belongs to TI's Widebus+™ family of high-bandwidth FET bus switches, engineered specifically for broadband communications, networking infrastructure, and data-intensive computing systems demanding minimal propagation delay and robust mixed-voltage interoperability.
FAQ
What is the maximum signal frequency supported by the SN74CB3Q32245ZKER?
The SN74CB3Q32245ZKER supports high-bandwidth data paths up to 500 MHz, as verified by TI's characterization of its low 4 pF OFF-state I/O capacitance and flat 5 Ω ON-state resistance across voltage and temperature ranges - enabling clean signal transmission without significant attenuation or phase distortion.
Does the SN74CB3Q32245ZKER support hot-swap or partial-power-down operation?
Yes, the SN74CB3Q32245ZKER features Ioff circuitry that limits reverse current to 1 µA maximum when VCC = 0 and VI/O = 0–5.5 V, allowing safe insertion/removal in live backplanes. Its undershoot clamp diodes and 5-V-tolerant I/Os further enhance robustness during hot-swap transitions.
Can the SN74CB3Q32245ZKER operate with 2.5-V VCC while switching 3.3-V signals?
Yes, the SN74CB3Q32245ZKER supports 0–3.3-V signal switching with 2.5-V VCC, as explicitly specified in its datasheet. This rail-to-rail capability eliminates external level shifters in mixed-voltage systems such as FPGA-to-ASIC interfaces or multi-supply memory subsystems.
What is the purpose of the charge pump in the SN74CB3Q32245ZKER?
The internal charge pump in the SN74CB3Q32245ZKER elevates the gate voltage of the pass FETs to maintain low and flat ON-state resistance (ron ≈ 5 Ω) across the full 0–5-V I/O voltage range - ensuring consistent signal integrity and minimal propagation delay regardless of input signal amplitude.
How many independent enable controls does the SN74CB3Q32245ZKER provide?
The SN74CB3Q32245ZKER provides four independent output-enable inputs (1OE, 2OE, 3OE, 4OE), each controlling one 8-bit switch section. This allows flexible configuration as four 8-bit, two 16-bit, or one 32-bit bus switch - supporting granular bus partitioning in complex interconnect architectures.
SN74CB3Q32245ZKER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CB
- Package/Case:
- 96-LFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 8 x 1:1
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 96-PBGA MICROSTAR (13.6x5.6)
SN74CB3Q32245ZKER FAQ
1.How can I place an order for SN74CB3Q32245ZKER through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CB3Q32245ZKER 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 SN74CB3Q32245ZKER reliable?
The price and inventory of SN74CB3Q32245ZKER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CB3Q32245ZKER is usually 5 days.
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Once your SN74CB3Q32245ZKER 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 SN74CB3Q32245ZKER?
For technical support, including SN74CB3Q32245ZKER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CB3Q32245ZKER requirements.
6.How does Aetrix verify that SN74CB3Q32245ZKER is sourced from the original manufacturer or authorized distributors?
All SN74CB3Q32245ZKER 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 SN74CB3Q32245ZKER meets industry standards.
7.What is the process for return or replacement of SN74CB3Q32245ZKER?
All SN74CB3Q32245ZKER units undergo pre-shipment inspection (PSI). If there is an issue with SN74CB3Q32245ZKER, 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 SN74CB3Q32245ZKER part is unused and in its original packaging.
Return procedure for SN74CB3Q32245ZKER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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