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onsemi MC74LCX652DWR2
- Part No.:
- MC74LCX652DWR2
- Manufacturer:
- onsemi
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MC74LCX652DWR2.pdf
- Description:
- REGISTERED BUS TRANSCEIVER
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Product details
Overview
MC74LCX652DWR2 from ON Semiconductor is a low-voltage CMOS octal transceiver/registered transceiver with dual enable, operating from 2.3 V to 3.6 V supply and featuring 5 V-tolerant inputs/outputs (up to 5.5 V), 24 mA balanced output drive, and near-zero static supply current (10 μA). It supports memory address driving and TTL-level bus-oriented bidirectional data transfer in mixed-voltage systems.
For engineers reviewing the MC74LCX652DWR2 datasheet, pinout, applications, or equivalent options, key selection criteria include dual-clock register control (CAB/CBA), independent output enables (OEAB/OEBA), real-time vs. registered mode operation, and SOIC-24 package compatibility with live insertion support.
Technical Context
The MC74LCX652DWR2 implements an octal bidirectional data path with two independent clock inputs (CAB, CBA) enabling edge-triggered latching of A- or B-side data on LOW-to-HIGH transitions. Its dual output enable (OEAB, OEBA) allows selective 3-state control per direction, while select controls (SAB, SBA) multiplex between real-time and registered data paths.
It integrates LVTTL- and LVCMOS-compatible I/O with 5 V tolerance, IOFF protection for live insertion, and latch-up immunity exceeding 500 mA. Propagation delays are specified at ≤8.5 ns (VCC = 2.7 V) and ≤7.0 ns (VCC = 3.0–3.6 V) for input-to-output paths, with output enable/disable times ≤9.5 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.3 V to 3.6 V - Enables direct interface with 2.5 V and 3.3 V logic domains without level shifters. |
| Input Voltage Tolerance | −0.5 V to +5.5 V - Allows safe connection to legacy 5 V TTL outputs without external clamping. |
| Output Drive Strength | ±24 mA at VCC ≥ 3.0 V - Sustains robust signal integrity across loaded backplanes or long traces. |
| Quiescent Supply Current | 10 μA max - Minimizes standby power in battery-backed or energy-sensitive embedded systems. |
| Propagation Delay (tPLH/tPHL) | ≤7.0 ns (VCC = 3.0–3.6 V) - Supports high-speed bus timing up to 150 MHz clock frequency. |
| IOFF Leakage | 10 μA at VCC = 0 V - Ensures true high-impedance isolation during hot-swap or power-down sequences. |
| ESD Rating | HBM >2000 V, MM >200 V - Provides baseline ESD resilience for board handling and system integration. |
Pinout & Package
DW suffix indicates 24-lead plastic SOIC package (Case 751E), 7.8 mm × 15.4 mm body, 1.27 mm pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Side A bidirectional I/O | Connects to local bus segment A; functions as input or 3-state output depending on OEAB/SAB state. |
| B0–B7 | Side B bidirectional I/O | Connects to remote bus segment B; operates symmetrically with A-side under OEBA/SBA control. |
| CAB, CBA | Low-to-High clock inputs | Edge-triggered clocks latch data from A→B (CAB) or B→A (CBA) into internal registers; not gated by OE. |
| SAB, SBA | Select control inputs | Configure data path: real-time (transparent), stored-A, stored-B, or both; determines source for output drivers. |
| OEAB, OEBA | Output enable inputs | Active-low enables drive from A→B (OEAB) or B→A (OEBA); independent control enables asymmetric bus flow. |
| VCC, GND | Power supply pins | Single 2.3–3.6 V supply; IOFF ensures high-impedance I/O when VCC = 0 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-clock registered transceiver | Independent CAB/CBA clocks allow asynchronous latching of A- and B-side data without cross-talk or timing dependency. |
| 5 V-tolerant I/O | Accepts 0–5.5 V input signals and drives 5 V-tolerant loads directly-eliminates need for external level translators in mixed-voltage systems. |
| Live insertion support | IOFF specification guarantees high-impedance I/O when VCC = 0 V, enabling safe hot-plug operation in modular backplane designs. |
| Low dynamic power | 25 pF power dissipation capacitance (CPD) and sub-μA leakage minimize switching power in high-frequency bus applications. |
| LVTTL/LVCMOS compatibility | Meets VIH/VIL thresholds for both logic families across full VCC range-ensures interoperability with diverse controller and peripheral ICs. |
Applications
| Memory Address Bus Interface | Processor-to-Peripheral Bridge |
|---|---|
|
Use Scenario: Bidirectional address/data multiplexing between a 3.3 V microcontroller and legacy 5 V SRAM or EPROM. IC Role / Device Role / Timing Role: Octal transceiver buffers and isolates address lines; registered mode synchronizes transfers to system clock edges. Use Value: 5 V-tolerant inputs accept 5 V memory outputs; dual OE control prevents bus contention during read/write cycles. |
Use Scenario: Interfacing a 2.5 V FPGA I/O bank to 3.3 V sensor hub or display controller over shared parallel bus. IC Role / Device Role / Timing Role: Level-shifting transceiver with real-time and registered modes; SAB/SBA selects between immediate pass-through and synchronized burst transfer. Use Value: ±24 mA drive sustains signal integrity across 10 cm PCB traces; low ICC reduces FPGA power domain loading. |
| Hot-Swappable Module Backplane | TTL-Compatible Test Equipment Interface |
|
Use Scenario: Isolating and buffering control/status lines between a main chassis controller and field-replaceable I/O modules. IC Role / Device Role / Timing Role: Isolation-mode transceiver with OEAB/OEBA disabled; stores A/B data during module insertion/removal using CBA/CAB pulses. Use Value: IOFF protection prevents backfeeding when module VCC is unpowered; latch-up immunity (>500 mA) withstands transient faults. |
Use Scenario: Adapting logic analyzer or boundary-scan test access to 3.3 V DUTs while maintaining compatibility with 5 V test instrumentation. IC Role / Device Role / Timing Role: Bidirectional voltage translator with precise setup/hold timing (ts = 2.5 ns, th = 1.5 ns) for high-fidelity signal capture. Use Value: Low propagation skew (<1.0 ns) ensures channel-to-channel timing alignment; 50 pF load drive meets test gear impedance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC8T245RHLR | Single-directional 8-bit bus transceiver with auto-direction sensing; no internal registers or dual-clock capability. | Requires external direction control logic; lacks registered storage and real-time/registered mode flexibility. | Prefer when only level translation is needed and clocked registration is unnecessary. |
| 74ALVC164245PAG | 16-bit dual-supply transceiver (VCCA = 2.3–3.6 V, VCCB = 3.0–5.5 V); no internal registers or select controls. | Supports asymmetric voltage domains but offers no data storage or multiplexed path selection. | Choose when interfacing 2.5 V/3.3 V logic to 5 V peripherals without need for clocked latching. |
Compared with SN74LVC8T245RHLR and 74ALVC164245PAG, the MC74LCX652DWR2 uniquely combines dual-clock registration, independent OE control, and real-time/registered mode selection in a single 24-pin SOIC-enabling complex bus arbitration and synchronous data staging not possible with simpler translators.
Availability
MC74LCX652DWR2 is available at Aetrix Electronics and suitable for memory address driving, processor-peripheral bridging, hot-swappable backplane interfaces, and TTL-compatible test equipment requiring stable component supply and long-term industrial availability.
Supply support for MC74LCX652DWR2 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 is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and discrete devices for automotive, industrial, and computing applications.
The MC74LCX652DWR2 belongs to the LCX low-voltage CMOS logic family, designed specifically for high-speed, low-power bidirectional bus interfacing in mixed-voltage embedded systems where 5 V legacy compatibility and register-controlled data staging are required.
FAQ
What is the maximum clock frequency supported by the MC74LCX652DWR2?
The MC74LCX652DWR2 supports a maximum clock pulse frequency (fmax) of 150 MHz when VCC is 3.0 V to 3.6 V, as specified in the AC characteristics table. At VCC = 2.7 V, the guaranteed minimum fmax is 100 MHz. These values assume CL = 50 pF and RL = 500 Ω loading conditions per the official ON Semiconductor datasheet revision 4.
Does the MC74LCX652DWR2 require external pull-up resistors on its I/O pins?
No, the MC74LCX652DWR2 does not require external pull-up resistors on its A0–A7 or B0–B7 pins under normal operation. Its inputs have high-impedance TTL-compatible structure with VIH = 2.0 V min and VIL = 0.8 V max, and outputs actively drive HIGH/LOW states with ±24 mA capability. Pull-ups are only needed if floating inputs must be held valid during power-up or isolation mode.
Can the MC74LCX652DWR2 operate with a 2.5 V supply voltage?
Yes, the MC74LCX652DWR2 is fully rated for 2.3 V to 3.6 V VCC operation, including 2.5 V. At 2.5 V, DC parameters such as VOH (≥2.2 V at IOL = 12 mA) and VOL (≤0.4 V) remain within specification, and AC performance (e.g., tPLH ≤ 8.5 ns) is maintained per the recommended operating conditions table in the datasheet.
How does the MC74LCX652DWR2 handle simultaneous enable of OEAB and OEBA?
When both OEAB and OEBA are active (LOW), the MC74LCX652DWR2 enters real-time mode: A-side data appears immediately on B outputs and B-side data appears on A outputs. In this configuration, outputs reinforce their respective inputs, but data retention is not guaranteed-internal registers are bypassed unless clocks (CAB/CBA) are actively asserted.
Is the MC74LCX652DWR2 pin-compatible with other LCX-series transceivers like MC74LCX162245?
No, the MC74LCX652DWR2 is not pin-compatible with MC74LCX162245 or other LCX transceivers. It uses a unique 24-pin SOIC pinout with dedicated dual-clock (CAB/CBA), dual-select (SAB/SBA), and dual-OE (OEAB/OEBA) signals. The MC74LCX162245 is a 48-pin 16-bit device with different pin assignment, voltage ratings, and no register/control logic-direct replacement requires PCB redesign.
MC74LCX652DWR2 Specifications
- Product attributes
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- Manufacturer:
- onsemi
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MC74LCX652DWR2 FAQ
1.How can I place an order for MC74LCX652DWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX652DWR2 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 MC74LCX652DWR2 reliable?
The price and inventory of MC74LCX652DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX652DWR2 is usually 5 days.
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Once your MC74LCX652DWR2 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 MC74LCX652DWR2?
For technical support, including MC74LCX652DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX652DWR2 requirements.
6.How does Aetrix verify that MC74LCX652DWR2 is sourced from the original manufacturer or authorized distributors?
All MC74LCX652DWR2 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 MC74LCX652DWR2 meets industry standards.
7.What is the process for return or replacement of MC74LCX652DWR2?
All MC74LCX652DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX652DWR2, 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 MC74LCX652DWR2 part is unused and in its original packaging.
Return procedure for MC74LCX652DWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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