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onsemi MC74LCX652DTR2
- Part No.:
- MC74LCX652DTR2
- Manufacturer:
- onsemi
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- Datasheet:
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MC74LCX652DTR2.pdf
- Description:
- REGISTERED BUS TRANSCEIVER
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Product details
Overview
MC74LCX652DTR2 from ON Semiconductor is a low-voltage CMOS octal transceiver/registered transceiver with dual output enables (OEAB, OEBA), 5 V-tolerant I/O, and 2.3–3.6 V operation. It supports real-time bidirectional bus transfer, registered data storage on both A and B sides, and isolation mode - used in memory address driving and TTL-level bus interfacing between mixed-voltage domains.
For engineers reviewing the MC74LCX652DTR2 datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V-tolerant I/O compatibility, dual-clock register control (CAB/CBA), balanced ±24 mA drive at 3.0–3.6 V, near-zero quiescent current (10 μA), and TSSOP-24 package suitability for space-constrained bus interface designs.
Technical Context
The MC74LCX652DTR2 implements dual independent clocked D-type registers per channel (QA/QB), enabling synchronous capture of A- or B-side data on LOW-to-HIGH transitions of CAB or CBA. Its select controls (SAB/SBA) multiplex between transparent and registered outputs without requiring external latches.
Two independent 3-state output enables (OEAB, OEBA) allow asymmetric bus control - e.g., enabling only A→B while holding B→A in high-impedance - and support live insertion via IOFF protection (high-impedance when VCC = 0 V) and 5.5 V absolute max input voltage rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables direct interface with 2.5 V/3.3 V logic while maintaining compatibility with legacy 5 V systems via 5 V-tolerant I/O. |
| Input Voltage Max | 5.5 V - Allows safe connection to 5 V TTL outputs without level-shifting circuitry. |
| Output Drive | ±24 mA at VCC = 3.0–3.6 V - Sufficient to drive standard TTL loads and multiple LVTTL inputs on shared buses. |
| Quiescent ICC | 10 μA - Minimizes standby power in battery-backed or low-power embedded systems. |
| Propagation Delay | 1.5–9.5 ns (tPLH/tPHL) - Supports high-speed bus operation up to 150 MHz clock frequency. |
| IOFF Leakage | 10 μA at VCC = 0 V - Ensures true high-impedance state during hot-swap or power sequencing. |
| ESD Rating | HBM >2000 V - Provides robust handling tolerance during board assembly and field service. |
Pinout & Package
MC74LCX652DTR2 is housed in a 24-lead plastic TSSOP package (Case 948H), 4.4 mm × 7.8 mm footprint, 0.65 mm lead pitch, with exposed pad not electrically connected. Pin 1 marked by beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Side A bidirectional I/O | Connects to local bus (e.g., microcontroller address/data); 5 V-tolerant, high-impedance when OEBA = H. |
| B0–B7 | Side B bidirectional I/O | Connects to remote bus (e.g., memory module); same electrical specs as A-side, independently controlled. |
| CAB | Clock A→B | LOW-to-HIGH edge clocks A-port data into QB register for later B-output delivery. |
| CBA | Clock B→A | LOW-to-HIGH edge clocks B-port data into QA register for later A-output delivery. |
| SAB | Select A→B path | L = deliver real-time A data to B; H = deliver stored QA data to B (registered mode). |
| SBA | Select B→A path | L = deliver real-time B data to A; H = deliver stored QB data to A (registered mode). |
| OEAB | Output Enable A→B | L = enable A→B outputs; H = tri-state B0–B7 regardless of SAB/CAB state. |
| OEBA | Output Enable B→A | L = enable B→A outputs; H = tri-state A0–A7 regardless of SBA/CBA state. |
| VCC | Power supply | 2.3–3.6 V supply; decoupling capacitor required within 1 cm for stable AC performance. |
| GND | Ground reference | Common return for all I/O and internal logic; must be low-inductance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-register architecture | Independent QA and QB storage registers per channel enable simultaneous A→B and B→A registered transfers without conflict. |
| 5 V-tolerant I/O | All inputs and outputs withstand 5.5 V, eliminating external level shifters when interfacing with 5 V peripherals or legacy controllers. |
| Live-insertion support | IOFF specification ensures high-impedance I/O when VCC = 0 V, preventing back-driving during hot-plug operations. |
| Low dynamic power | 25 pF power dissipation capacitance (CPD) and sub-10 μA ICC reduce total system power in idle and active states. |
| Bus hold immunity | High-impedance TTL-compatible inputs minimize loading on upstream drivers and improve noise margin in unterminated stubs. |
Applications
| Memory Address Buffering | Multi-Voltage Bus Interface |
|---|---|
Use Scenario: Isolating and driving 8-bit address lines from a 3.3 V microcontroller to a 5 V SRAM or EPROM. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver with registered hold capability to meet address setup/hold timing under variable load. Use Value: Eliminates discrete level shifters and latch ICs; 5 V-tolerant I/O prevents damage from 5 V memory outputs during read cycles. |
Use Scenario: Interfacing a 2.5 V FPGA I/O bank to a 3.3 V peripheral bus with strict timing and signal integrity requirements. IC Role / Device Role / Timing Role: Registered transceiver providing deterministic propagation delay (≤9.5 ns) and output skew ≤1.0 ns across all 8 channels. Use Value: Enables synchronous handshaking between voltage domains while meeting tSU/th timing margins without custom PCB routing compensation. |
| Hot-Swappable Module Interface | Isolated Diagnostic Bus |
Use Scenario: Backplane slot interface where daughter cards may be inserted/removed while main system remains powered. IC Role / Device Role / Timing Role: Dual-enable transceiver with IOFF protection ensuring zero current injection into unpowered modules during insertion. Use Value: Prevents bus contention and latch-up during hot-swap events; meets IEC 61000-4-2 ESD immunity requirements (>2000 V HBM). |
Use Scenario: Isolating diagnostic signals (e.g., JTAG, UART debug) from a main processor domain during firmware update or fault recovery. IC Role / Device Role / Timing Role: Controlled isolation mode (OEAB = OEBA = H) blocks all data flow while preserving register contents for post-fault analysis. Use Value: Maintains visibility into system state without disrupting host operation; no external pull-ups needed due to high-impedance TTL-compatible inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC8T245RHLR | Single-directional (A→B only), no internal registers, 1.65–5.5 V operation, 32 mA drive. | Requires external clocking logic for registered behavior; better suited for simple level translation than synchronous buffering. | Choose when only unidirectional translation is needed and board space allows separate clock/control logic. |
| 74ALVC164245PAG | 16-bit, dual-supply (VCCA=2.3–3.6 V, VCCB=3.0–5.5 V), no internal registers, higher drive (±24 mA). | Supports asymmetric voltage domains but lacks on-chip storage; requires external flip-flops for register functionality. | Choose for wider bus width and dual-supply flexibility, accepting added component count for register function. |
Compared with SN74LVC8T245RHLR and 74ALVC164245PAG, the MC74LCX652DTR2 uniquely integrates dual-clock registers, 5 V-tolerant I/O, and dual-output enables in a single 24-pin TSSOP - reducing BOM count and PCB area for synchronous multi-domain bus applications requiring hold, isolation, and real-time modes.
Availability
MC74LCX652DTR2 is available at Aetrix Electronics and suitable for memory address driving, multi-voltage bus interfacing, hot-swappable module design, and isolated diagnostic bus applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MC74LCX652DTR2 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, cloud, and consumer markets.
The MC74LCX652DTR2 belongs to the LCX low-voltage CMOS logic family, designed specifically for mixed-voltage system interfacing where 2.3–3.6 V core logic must reliably communicate with 5 V legacy peripherals without external level-shifting components.
FAQ
What is the maximum clock frequency supported by the MC74LCX652DTR2?
The MC74LCX652DTR2 supports a maximum clock pulse frequency of 150 MHz at VCC = 3.0–3.6 V, as specified in its AC characteristics table. This applies to both CAB and CBA inputs when driving registered data transfers. At VCC = 2.7 V, the maximum frequency drops to 100 MHz. The device achieves this speed with propagation delays as low as 1.5 ns and output skew limited to 1.0 ns, making it suitable for high-speed synchronous bus applications.
Does the MC74LCX652DTR2 require external pull-up or pull-down resistors on its inputs?
No, the MC74LCX652DTR2 does not require external pull-up or pull-down resistors on its inputs. Its TTL-compatible inputs exhibit high-impedance behavior with input leakage current limited to ±5.0 μA over temperature, and VIH/VIL thresholds (2.0 V/0.8 V at VCC ≥ 2.7 V) ensure reliable logic recognition without biasing. Floating inputs are discouraged per datasheet Note * - they increase ICC and risk metastability - but termination is not electrically necessary.
Can the MC74LCX652DTR2 operate with VCC = 2.5 V?
Yes, the MC74LCX652DTR2 is fully specified for operation at VCC = 2.5 V, which falls within its recommended range of 2.3 V to 3.6 V. At 2.5 V, DC parameters such as VOH (≥2.3 V at IOL = 12 mA) and VOL (≤0.4 V) remain valid, and AC performance is characterized down to 2.7 V - with derated timing (e.g., fmax = 100 MHz). System validation at 2.5 V is recommended using worst-case corner simulations and actual board testing.
How does the MC74LCX652DTR2 handle power sequencing when VCC ramps up or down?
The MC74LCX652DTR2 incorporates IOFF circuitry that guarantees high-impedance I/O states when VCC = 0 V, preventing back-current flow during power-down or partial powering. During VCC ramp-up, inputs remain inactive until VCC exceeds ~1.5 V (data retention threshold), and full functionality begins at ~2.0 V. This behavior supports robust hot-swap and mixed-rail sequencing in modular systems without external power-good supervision.
What is the thermal resistance (θJA) of the MC74LCX652DTR2 in its TSSOP package?
The MC74LCX652DTR2 in the DT-suffix TSSOP-24 package (Case 948H) has a typical junction-to-ambient thermal resistance (θJA) of 130°C/W under standard JEDEC JESD51-2 conditions (single-layer 1-in² copper pad). With 2-in² copper pour and two thermal vias per lead, θJA improves to ~65°C/W. Maximum junction temperature remains 150°C; at 24 mA output drive and 10 μA ICC, self-heating is negligible below 70°C ambient.
MC74LCX652DTR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
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- Packaging:
- Bulk
- Product Status:
- Active
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- -
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- -
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- Input Type:
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MC74LCX652DTR2 FAQ
1.How can I place an order for MC74LCX652DTR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX652DTR2 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 MC74LCX652DTR2 reliable?
The price and inventory of MC74LCX652DTR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX652DTR2 is usually 5 days.
3.What payment methods are accepted for MC74LCX652DTR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX652DTR2 transactions.
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4.How is shipping managed for MC74LCX652DTR2?
MC74LCX652DTR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX652DTR2 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 MC74LCX652DTR2?
For technical support, including MC74LCX652DTR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX652DTR2 requirements.
6.How does Aetrix verify that MC74LCX652DTR2 is sourced from the original manufacturer or authorized distributors?
All MC74LCX652DTR2 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 MC74LCX652DTR2 meets industry standards.
7.What is the process for return or replacement of MC74LCX652DTR2?
All MC74LCX652DTR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX652DTR2, 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 MC74LCX652DTR2 part is unused and in its original packaging.
Return procedure for MC74LCX652DTR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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