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NXP Semiconductors 74HC652D,118
- Part No.:
- 74HC652D,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC652D,118.pdf
- Description:
- IC TXRX NON-INVERT 6V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
74HC652D,118 from NXP Semiconductors (formerly Philips) is an octal bus transceiver/register with independent A/B register storage, dual 3-state control, and real-time or clocked data routing. It operates at up to 92 MHz (VCC = 5 V), supports 2.0–6.0 V supply, features Schmitt-trigger clock inputs, and delivers bus-driver output capability for bidirectional data flow between two 8-bit buses.
For engineers reviewing the 74HC652D,118 datasheet, 74HC652D,118 pinout, 74HC652D,118 application, or 74HC652D,118 equivalent, key selection criteria include independent A→B and B→A clocking (CPAB/CPBA), separate select (SAB/SBA) and output enable (OEAB/OEBA) controls, real-time vs. registered mode operation, and SO-24 package compatibility with industrial temperature range (−40 °C to +125 °C).
Technical Context
The 74HC652D,118 integrates eight non-inverting transceiver channels with D-type flip-flops per bus direction, enabling simultaneous storage of A-bus and B-bus data on independent clock edges. Its dual-select architecture allows real-time pass-through (SAB/SBA = HIGH) or registered transfer (SAB/SBA = LOW), with output enables (OEAB/OEBA) gating direction-specific 3-state outputs.
Schmitt-trigger inputs on CPAB and CPBA tolerate slow-rising clock signals, while propagation delays (e.g., 13 ns An→Bn at VCC = 5 V, CL = 15 pF) and tW ≥ 14 ns (min clock pulse width) define timing margins for synchronous bus arbitration. The device complies with JEDEC Standard No. 7A and is pin-compatible with LSTTL logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Supports mixed-voltage system interfacing and battery-backed operation down to 2 V. |
| Max Clock Frequency | 92 MHz at VCC = 5 V - Enables high-speed bidirectional data handshaking in microprocessor address/data bus applications. |
| Propagation Delay (An→Bn) | 13 ns typical at VCC = 5 V, CL = 15 pF - Determines minimum cycle time for registered transfers between buses. |
| 3-State Enable Time | 14 ns typical (OEAB/OEBA → Bn/An) - Critical for glitch-free bus arbitration during direction switching. |
| Input Capacitance | 3.5 pF - Minimizes loading on driving logic and preserves signal integrity in dense PCB layouts. |
| Power Dissipation Cap. (per channel) | 26 pF (HC) - Used to calculate dynamic power: PD = CPD × VCC² × fi + Σ(CL × VCC² × fo). |
| Operating Temperature | −40 °C to +125 °C - Qualified for automotive and industrial environments without derating. |
Pinout & Package
74HC652D,118 is housed in a 24-pin Small Outline (SO) plastic package (SOT137A), with 1.27 mm pitch, gull-wing leads, and standard JEDEC MS-013 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPAB (Pin 1) | A-to-B clock input | Triggers storage of A-bus data into internal D-flip-flops for later B-bus output; Schmitt-triggered for noise immunity. |
| SAB (Pin 2) | A-to-B select input | LOW enables registered transfer (clocked); HIGH enables real-time A→B pass-through regardless of CPAB state. |
| OEAB (Pin 3) | A-to-B output enable | LOW activates B-bus outputs with A-bus data; HIGH forces B-bus outputs to high-impedance. |
| A0–A7 (Pins 4–11) | A-bus I/O terminals | Bidirectional data lines shared between A-side logic and internal registers; driven by external sources when OEAB/OEBA inactive. |
| GND (Pin 12) | Ground reference | Primary 0 V return path for all internal logic and output drivers; must be low-inductance connection. |
| B7–B0 (Pins 13–20) | B-bus I/O terminals | Bidirectional data lines shared between B-side logic and internal registers; functionally symmetric to A0–A7. |
| OEBA (Pin 21) | B-to-A output enable | LOW activates A-bus outputs with B-bus data; HIGH forces A-bus outputs to high-impedance. |
| SBA (Pin 22) | B-to-A select input | LOW enables registered transfer (clocked); HIGH enables real-time B→A pass-through regardless of CPBA state. |
| CPBA (Pin 23) | B-to-A clock input | Triggers storage of B-bus data into internal D-flip-flops for later A-bus output; Schmitt-triggered. |
| VCC (Pin 24) | Positive supply | Single 2.0–6.0 V rail powering all logic, registers, and output drivers; decoupling required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register storage | Separate D-flip-flops for A→B and B→A paths allow concurrent capture of both bus states without interference. |
| Real-time + registered mode selection | SAB/SBA pins let designers choose immediate pass-through or clock-synchronized transfer per direction-no external logic needed. |
| Asymmetric 3-state control | OEAB and OEBA operate independently, enabling one-directional drive while holding the opposite bus in high-Z-essential for bus arbitration. |
| Schmitt-trigger clock inputs | CPAB and CPBA accept slow or noisy clocks (e.g., from mechanical switches or RC oscillators) without false triggering. |
| Bus-driver output capability | Outputs drive standard TTL loads directly, eliminating need for external buffers in 5 V systems. |
Applications
| Microprocessor Bus Interface | Memory Expansion Subsystem |
|---|---|
Use Scenario: Connecting an 8-bit microcontroller data bus to external RAM or peripheral ICs with separate address latching. IC Role / Device Role / Timing Role: Bidirectional data transceiver that isolates CPU and memory buses, stores address/data during wait states, and synchronizes transfers using CPAB/CPBA. Use Value: Eliminates need for discrete latches and direction-control logic; supports WAIT signal coordination via SAB/SBA real-time mode during active cycles. |
Use Scenario: Expanding local memory capacity in embedded controllers where multiple SRAM chips share a common data bus. IC Role / Device Role / Timing Role: Registers and routes data between master bus and slave memory banks, with OEAB/OEBA enabling chip-select-driven bus partitioning. Use Value: Enables simultaneous read/write to different memory regions using stored A/B data-reducing bus turnaround overhead by up to 40% vs. single-transceiver solutions. |
| Dual-Port FIFO Emulation | Industrial PLC Backplane Interface |
Use Scenario: Implementing low-cost dual-port buffer logic between two asynchronous subsystems (e.g., sensor interface and display controller). IC Role / Device Role / Timing Role: Acts as edge-triggered dual-register stage: CPAB captures sensor data into A-registers; CPBA clocks display-ready data from B-registers. Use Value: Provides deterministic latency (13 ns + clock skew) and eliminates metastability risk through synchronized sampling-no external synchronizers required. |
Use Scenario: Interfacing modular I/O cards to a central PLC backplane operating at varying voltage levels (e.g., 3.3 V CPU, 5 V sensors). IC Role / Device Role / Timing Role: Level-translating transceiver with independent enable/control per slot, supporting hot-swap isolation via OEAB/OEBA assertion. Use Value: Maintains signal integrity across 24 V industrial noise environments due to Schmitt-trigger clocks and 125 °C rating-no additional ESD or filtering needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT652D,118 | TTL-compatible input thresholds (VIH = 2.0 V min); slightly higher ICC at VCC = 4.5 V. | Better suited for mixed 5 V TTL/CMOS systems where input noise margin must match legacy LSTTL drivers. | Select when interfacing with 74LS or 74F logic; retains identical pinout, timing, and functionality. |
| SN74LVTH16652DGGR | 16-bit, dual-supply (1.65–3.6 V core / 3.3 V I/O), no internal registers, LVCMOS level-shifting only. | Lacks clocked storage and real-time/select modes; used for voltage translation-not bus arbitration or data staging. | Choose only for low-voltage, high-density board space constraints; not a functional replacement for registered operation. |
Compared with 74HC652D,118, the 74HCT652D,118 offers direct drop-in compatibility with TTL inputs but trades off some noise immunity at low VCC; the SN74LVTH16652DGGR provides wider voltage support and higher density but omits critical register and mode-selection functions-making it unsuitable for applications requiring stored-data multiplexing.
Availability
74HC652D,118 is available at Aetrix Electronics and suitable for microprocessor bus interfaces, memory expansion subsystems, and industrial PLC backplane interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 74HC652D,118 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
NXP Semiconductors designs high-reliability logic and interface ICs for automotive, industrial, and computing applications, with heritage from Philips Semiconductor's IC division.
The 74HC652D,118 belongs to the 74HC/HCT logic family-engineered for pin-compatible migration from LSTTL, emphasizing low power, wide supply range, and robust noise immunity in real-world embedded systems.
FAQ
What is the maximum operating frequency of the 74HC652D,118?
The 74HC652D,118 supports a maximum clock frequency of 92 MHz when operated at VCC = 5 V and Tamb = 25 °C with CL = 15 pF. At VCC = 4.5 V and −40 °C to +125 °C, the guaranteed fmax drops to 83 MHz. This specification applies specifically to CPAB and CPBA inputs driving internal register updates-not to real-time pass-through mode, which is limited only by propagation delay (13 ns typical).
Does the 74HC652D,118 support true bidirectional data flow with independent control?
Yes, the 74HC652D,118 enables fully independent bidirectional control: OEAB governs A→B output drive, OEBA governs B→A output drive, and SAB/SBA determine whether each path operates in real-time or registered mode. This allows simultaneous A→B real-time transfer and B→A registered transfer-unlike simpler transceivers such as the 74HC245.
Can the 74HC652D,118 be used without connecting both VCC and GND?
No-the 74HC652D,118 requires both VCC (Pin 24) and GND (Pin 12) to be properly connected to function. Leaving either unconnected will prevent internal logic operation, disable register clocks, and cause undefined output states. Decoupling capacitors (e.g., 100 nF ceramic) must be placed between VCC and GND within 5 mm of the package.
How does the Schmitt-trigger action on CPAB and CPBA benefit system design?
The Schmitt-trigger inputs on CPAB and CPBA provide hysteresis (typ. 0.8 V at VCC = 5 V), allowing reliable clocking from slow-rising signals such as RC-generated clocks, mechanical switch debounces, or noisy industrial control lines. This eliminates external hysteresis circuitry and prevents multiple clock edges from a single transition-ensuring deterministic register capture in the 74HC652D,118.
Is the 74HC652D,118 pin-compatible with the 74HC646?
No-the 74HC652D,118 differs from the 74HC646 in having independent SAB/SBA and CPAB/CPBA controls, enabling simultaneous A→B and B→A registered transfers. The 74HC646 uses a single select and clock pair, limiting it to unidirectional registered operation. Pinouts are incompatible: 74HC646 has 24 pins but assigns CP and S differently and lacks OEBA/SBA functionality.
74HC652D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
74HC652D,118 FAQ
1.How can I place an order for 74HC652D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC652D,118 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 74HC652D,118 reliable?
The price and inventory of 74HC652D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC652D,118 is usually 5 days.
3.What payment methods are accepted for 74HC652D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC652D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC652D,118?
74HC652D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC652D,118 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 74HC652D,118?
For technical support, including 74HC652D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC652D,118 requirements.
6.How does Aetrix verify that 74HC652D,118 is sourced from the original manufacturer or authorized distributors?
All 74HC652D,118 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 74HC652D,118 meets industry standards.
7.What is the process for return or replacement of 74HC652D,118?
All 74HC652D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC652D,118, 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 74HC652D,118 part is unused and in its original packaging.
Return procedure for 74HC652D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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