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Texas Instruments SN74FB2033HRC
- Part No.:
- SN74FB2033HRC
- Manufacturer:
- Texas Instruments
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- -
- Datasheet:
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SN74FB2033HRC.pdf
- Description:
- LINE TRANSCEIVER
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Product details
Overview
SN74FB2033HRC from Texas Instruments is an 8-bit TTL/BTL registered transceiver with split AI/AO TTL ports and open-collector BTL backplane port, supporting buffer/latch/flip-flop data-path modes, 100 mA B-port sink capability, and live-insertion biasing via BIAS VCC. It enables high-speed backplane communication in modular computing systems requiring hot-swap compatibility.
For engineers reviewing the SN74FB2033HRC datasheet, SN74FB2033HRC pinout, SN74FB2033HRC application, or SN74FB2033HRC equivalent, key selection considerations include BTL output drive strength (100 mA), dual-mode clock/latch control (CLKAB/LEAB & CLKBA/LEBA), LOOPBACK-enabled bidirectional data routing, and IEEE Std 1194.1-1991 BTL compliance for backplane signal integrity.
Technical Context
This device implements independent A-to-B and B-to-A logic paths, each configurable as buffer, D-type latch, or D-type flip-flop using IMODE/OMODE inputs. The B port operates at BTL levels (VOH ≥ 1.62 V, VOL ≤ 0.75 V) with active clamping to suppress inductive ringing during switching.
BIAS VCC establishes a stable 1.62–2.1 V prebias on B outputs during power-off or live insertion, while BG VCC/BG GND reference the internal bias generator. AO port enable (OEA) and B port enable (OEB/OEB) provide independent high-impedance control, and LOOPBACK selects between B-port or A-to-B output data as B-to-A input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 4.75–5.25 V - Ensures TTL-compatible operation and stable internal logic timing. |
| B-port Output Sink | 100 mA - Supports direct driving of terminated BTL backplane traces without external buffers. |
| Max Clock Frequency | 150 MHz - Enables high-throughput data transfer in synchronous backplane architectures. |
| Propagation Delay (B→AO) | 2.5–5.5 ns - Guarantees sub-6 ns latency for time-critical backplane read/write cycles. |
| Live-Insertion Bias | BIAS VCC = 4.5–5.5 V sets B-port prebias to 1.62–2.1 V - Prevents signal distortion during hot-plug events. |
| Input Clamp Current (B port) | –18 mA - Protects inputs against transient overvoltage during backplane mating/unmating. |
| IEEE Compliance | IEEE Std 1194.1-1991 - Validates electrical interface interoperability with standard BTL backplane systems. |
Pinout & Package
SN74FB2033HRC is housed in a 52-pin QFP package (RC drawing), measuring 12.95 mm × 12.95 mm × 2.45 mm, with 0.65 mm lead pitch and JEDEC MS-022 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AI1–AI8 | A-port input data lines | TTL-level inputs feeding A-to-B logic path; require termination to VCC or GND when unused. |
| AO1–AO8 | A-port output data lines | Active-drive TTL outputs enabled by OEA; enter high-Z when OEA = low or VCC < 2.5 V. |
| B1–B8 | B-port open-collector outputs | BTL-level outputs sinking up to 100 mA; require external pull-up; biased by BIAS VCC during power-off. |
| CLKAB/LEAB, CLKBA/LEBA | Directional clock/latch enable | Rising-edge-triggered for flip-flop mode; active-high transparent enable for latch mode. |
| OEA, OEB, OEB | Output enable controls | OEA enables AO port; OEB/OEB differential pair enables B port (OEB high + OEB low = active). |
| IMODE0/1, OMODE0/1 | Logic element configuration | Select buffer/latch/flip-flop behavior per direction; L/L = buffer, L/H = flip-flop, H/X = latch. |
| LOOPBACK | B-to-A input source selector | Low = B-port data; high = un-inverted A-to-B logic output - enables echo/test modes. |
| BIAS VCC, BG VCC, BG GND | Bias generator references | BIAS VCC powers B-port prebias network; BG VCC/BG GND set internal bias generator reference. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable logic elements | Per-direction selection of buffer, D-latch, or D-flip-flop via IMODE/OMODE - supports synchronous, transparent, or edge-triggered data flow. |
| BTL output clamping | Dual active clamps suppress ringing below VOL (0.75 V) and above VOH (1.62 V) - ensures clean transitions on inductive backplane traces. |
| Live-insertion support | BIAS VCC establishes 1.62–2.1 V on B outputs with VCC = 0 - prevents false signaling and contact arcing during hot-swap. |
| High-impedance safety | AO port enters high-Z at power-up/down (VCC < 2.5 V) and B port disables when OEB/OEB invalid - avoids bus contention during sequencing. |
| TTL input clamping | Integrated active clamping networks on AI/control inputs - simplify line termination and improve noise immunity on TTL buses. |
Applications
| Modular Backplane Systems | Hot-Swappable I/O Cards |
|---|---|
|
Use Scenario: Data exchange between CPU and peripheral modules across a shared backplane with strict hot-swap requirements. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing TTL-to-BTL conversion and timing-controlled data latching. Use Value: 100 mA B-port drive sustains signal integrity over 30 cm backplane traces; LOOPBACK enables diagnostic loopback without external wiring. |
Use Scenario: Insertion/removal of I/O cards in industrial PLC chassis while main system remains operational. IC Role / Device Role / Timing Role: Backplane interface IC providing live-insertion biasing and controlled output enable/disable sequencing. Use Value: BIAS VCC preconditions B outputs to 1.62–2.1 V before VCC ramp-up - eliminates glitches and contact bounce artifacts. |
| Telecom Line Cards | Test Equipment Backplanes |
|
Use Scenario: High-density telecom shelf architecture where line cards communicate with switch fabric via parallel BTL bus. IC Role / Device Role / Timing Role: Registered transceiver synchronizing data transfers using CLKBA/LEBA with 150 MHz max clock rate. Use Value: Sub-6 ns B→AO propagation delay meets tight setup/hold timing budgets in multi-slot telecom backplanes. |
Use Scenario: Automated test equipment (ATE) backplane connecting instrument modules to controller with reconfigurable data paths. IC Role / Device Role / Timing Role: Programmable transceiver enabling flexible A↔B data routing via IMODE/OMODE and LOOPBACK control. Use Value: Dual-mode logic (latch/flip-flop) allows both transparent monitoring and synchronized capture of test signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FB2033ARC | Identical die and RC package; same marking FB2033A - functionally identical to SN74FB2033HRC. | No functional difference; both rated for 0°C to 70°C operation and IEEE 1194.1 BTL compliance. | Select SN74FB2033ARC if RoHS-compliant green packaging (SN74FB2033ARCRG3) is required; otherwise interchangeable. |
| SN74FB2033ARCR | Same RC package and electrical specs; differs only in tape-and-reel packaging (500-unit reel vs. tube). | Identical performance and pinout; suited for automated SMT assembly rather than manual prototyping. | Choose SN74FB2033ARCR for volume production with pick-and-place integration; no design or layout changes needed. |
Compared with SN74FB2033HRC, SN74FB2033ARC offers identical functionality in the same RC package with legacy Pb/Sn finish, while SN74FB2033ARCR provides the same silicon in tape-and-reel format optimized for SMT manufacturing - all three share identical timing, biasing, and BTL drive characteristics.
Availability
SN74FB2033HRC is available at Aetrix Electronics and suitable for modular backplane systems, hot-swappable I/O card designs, and telecom line card applications requiring stable component supply and long-term lifecycle support.
Supply support for SN74FB2033HRC 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 heritage in high-reliability interface and timing products.
The SN74FB2033HRC belongs to TI's FB-series registered transceivers, designed specifically for robust, high-speed backplane interconnect in modular computing and telecommunications infrastructure.
FAQ
What is the maximum operating frequency of the SN74FB2033HRC?
The SN74FB2033HRC supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This specification applies to both CLKAB/LEAB and CLKBA/LEBA inputs and is validated in the timing requirements table of the official datasheet. At higher temperatures or lower supply voltages, derating may be necessary to maintain reliable flip-flop operation.
Does the SN74FB2033HRC support live insertion, and how is it implemented?
Yes, the SN74FB2033HRC supports live insertion via its dedicated BIAS VCC pin, which establishes a 1.62–2.1 V bias voltage on B-port outputs even when VCC = 0. This preconditions backplane traces to BTL high-level voltage before main power ramps, preventing false signaling and contact arcing. BG VCC and BG GND pins reference the internal bias generator to ensure stable operation during hot-swap sequences.
What are the key differences between the SN74FB2033HRC and SN74FB2033ARC?
The SN74FB2033HRC and SN74FB2033ARC are functionally identical devices sharing the same RC package, pinout, electrical specifications, and marking (FB2033A). The primary distinction lies in packaging format: SN74FB2033HRC is supplied in tubes, while SN74FB2033ARC is also tube-packaged but historically associated with Pb/Sn finish. Both operate over 0°C to 70°C and comply with IEEE Std 1194.1-1991.
How does the LOOPBACK feature function in the SN74FB2033HRC?
In the SN74FB2033HRC, the LOOPBACK input determines the source of data fed into the B-to-A logic path: when LOOPBACK = low, B-port signals serve as input; when LOOPBACK = high, the un-inverted output of the A-to-B logic element (buffer/latch/flip-flop) is routed to the B-to-A path. This enables real-time echo testing and diagnostic verification without external loopback cabling.
What is the purpose of the dual OEB/OEB control on the B port of the SN74FB2033HRC?
The SN74FB2033HRC uses complementary OEB and OEB inputs to enable the open-collector B port: the B port activates only when OEB = high and OEB = low. This differential enable scheme improves noise immunity and prevents accidental activation due to single-point failures or floating inputs. When either control is invalid (e.g., OEB low or OEB high), the B port enters high-impedance inactive state.
SN74FB2033HRC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
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- Input Type:
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- Output Type:
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- Current - Output High, Low:
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- Voltage - Supply:
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- Operating Temperature:
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- Grade:
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- Qualification:
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- Supplier Device Package:
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SN74FB2033HRC FAQ
1.How can I place an order for SN74FB2033HRC through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74FB2033HRC 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 SN74FB2033HRC reliable?
The price and inventory of SN74FB2033HRC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74FB2033HRC is usually 5 days.
3.What payment methods are accepted for SN74FB2033HRC?
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4.How is shipping managed for SN74FB2033HRC?
SN74FB2033HRC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74FB2033HRC 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 SN74FB2033HRC?
For technical support, including SN74FB2033HRC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74FB2033HRC requirements.
6.How does Aetrix verify that SN74FB2033HRC is sourced from the original manufacturer or authorized distributors?
All SN74FB2033HRC 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 SN74FB2033HRC meets industry standards.
7.What is the process for return or replacement of SN74FB2033HRC?
All SN74FB2033HRC units undergo pre-shipment inspection (PSI). If there is an issue with SN74FB2033HRC, 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 SN74FB2033HRC part is unused and in its original packaging.
Return procedure for SN74FB2033HRC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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