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NXP Semiconductors 74HCT640D,652
- Part No.:
- 74HCT640D,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT640D,652.pdf
- Description:
- IC TRANSCEIVER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,252
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Product details
Overview
74HCT640D,652 from NXP Semiconductors is an octal inverting 3-state bus transceiver used for bidirectional data flow control between two 8-bit buses. It features direction control (DIR), active-low output enable (OE), propagation delay of 11 ns at VCC = 4.5 V, bus-driver output capability, and TTL-compatible input thresholds. It is commonly deployed in industrial backplane interfaces requiring level-shifted, isolated bus communication.
For engineers reviewing the 74HCT640D,652 datasheet, 74HCT640D,652 pinout, 74HCT640D,652 application, or 74HCT640D,652 equivalent, key selection criteria include its inverting logic behavior, 3-state timing (tPZH/tPHZ ≤ 45 ns), ±25 mA output drive, HCT-family 5 V TTL compatibility, and SO20 package footprint constraints.
Technical Context
The 74HCT640D,652 implements dual-directional data transfer with inversion on both A→B and B→A paths, controlled by DIR and OE inputs. Its HCT logic family ensures 5 V TTL-level input recognition (VIH = 2.0 V min, VIL = 0.8 V max) while maintaining CMOS power efficiency and noise immunity.
It operates across −40 °C to +85 °C with supply voltage fixed at 4.5–5.5 V, supports 50 pF load capacitance per output, and delivers 3-state enable/disable times under 45 ns - critical for synchronous bus arbitration in legacy control systems and memory-mapped I/O designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation in standard 5 V TTL/CMOS mixed-signal systems |
| tPHL/tPLH | 11 ns typical (VCC = 4.5 V, CL = 50 pF) - defines maximum data throughput rate in bidirectional bus cycles |
| tPZH/tPHZ | ≤ 45 ns max (−40 °C to +125 °C) - guarantees deterministic 3-state transition for bus contention avoidance |
| IOH/IOL | ±25 mA - enables direct driving of multiple LSTTL loads without external buffers |
| VIH/VIL | 2.0 V / 0.8 V - provides guaranteed TTL-level input compatibility for legacy controller interfacing |
| CI/O | 10 pF - limits capacitive loading on shared bus lines, preserving signal integrity at 20 MHz+ toggle rates |
Pinout & Package
74HCT640D,652 is housed in a 20-pin small-outline integrated circuit (SO20) package with 1.27 mm pitch, JEDEC MS-013 compliant outline, and surface-mount mounting. Pin 10 is GND; Pin 20 is VCC; DIR (Pin 1) and OE (Pin 19) are active-high and active-low control inputs respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | High = A→B data flow; Low = B→A; determines signal path polarity and inversion direction |
| OE (Pin 19) | Output enable (active LOW) | Low = outputs enabled; High = all A/B pins enter high-impedance state for bus isolation |
| A0–A7 (Pins 2–9) | Bidirectional I/O port A | Inverts data when transmitting to B side; receives inverted data from B side |
| B0–B7 (Pins 11–18) | Bidirectional I/O port B | Inverts data when transmitting to A side; receives inverted data from A side |
| GND (Pin 10) | Ground reference | Return path for all internal logic and output current; must be low-inductance connection |
| VCC (Pin 20) | Positive supply | Primary power rail for logic core and output drivers; requires local 100 nF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Inverting bidirectional data path | Ensures consistent signal polarity inversion across both directions - simplifies timing analysis in symmetric bus architectures |
| TTL-compatible input thresholds | Accepts standard 5 V TTL logic levels without level-shifting, enabling drop-in replacement in LSTTL-based systems |
| 3-state bus isolation | OE-controlled high-impedance outputs prevent bus contention during multi-master arbitration or standby modes |
| SO20 surface-mount package | Enables high-density PCB layouts with automated assembly compatibility and thermal performance suitable for industrial ambient |
Applications
| Industrial PLC Backplane Interface | Legacy Memory-Mapped I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller address/data buses to modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional inverting transceiver managing data flow between CPU and peripheral modules with bus contention protection. Use Value: Enables clean separation of master/slave domains using OE-driven 3-state isolation and DIR-synchronized inversion, reducing routing complexity in DIN-rail mounted controllers. | Use Scenario: Expanding 8-bit microprocessor I/O space via parallel peripheral chips (e.g., 8255, 6821) in retro-computing or test equipment. IC Role / Device Role / Timing Role: Level-translating, inverting bus interface ensuring TTL-compatible signaling between CPU and legacy peripherals. Use Value: Maintains strict timing alignment (tPHL ≤ 11 ns) and drive strength (±25 mA) required for reliable handshake protocols like strobe/acknowledge handshaking. |
| Automotive Body Control Module Bus Arbiter | Test Equipment Signal Routing Matrix |
Use Scenario: Managing shared sensor/actuator data lanes among multiple ECUs in non-critical body electronics subsystems. IC Role / Device Role / Timing Role: Isolatable bidirectional transceiver coordinating time-multiplexed access to common CAN/LIN support buses. Use Value: Provides deterministic 3-state disable timing (tPHZ ≤ 45 ns) to prevent metastability during ECU handover sequences in 12 V automotive environments. | Use Scenario: Reconfigurable signal routing between DUT, stimulus sources, and measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: Inverting bus switch enabling polarity-aware signal path selection under microcontroller control. Use Value: Supports fast, repeatable path reconfiguration (OE toggle < 45 ns) with minimal added skew - critical for parametric test repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245D,652 | Non-inverting data path; identical pinout, timing, and drive capability | Requires logic inversion elsewhere in design if system-level inversion is mandatory | Select when bidirectional data must retain polarity across A↔B paths |
| SN74HCT640N | DIP-20 through-hole package; same electrical specs and function | Suitable for prototyping, repair, or legacy through-hole production where SO20 reflow is unavailable | Select when manual assembly, socketing, or thermal cycling robustness is prioritized over board density |
Compared with 74HCT640D,652, the 74HCT245D,652 eliminates inversion but demands external logic adjustment, while SN74HCT640N preserves identical functionality at the cost of larger footprint and lower thermal efficiency - making 74HCT640D,652 optimal for space-constrained, surface-mount industrial control designs.
Availability
74HCT640D,652 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and test equipment signal routing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 74HCT640D,652 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 is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in logic IC development dating to Philips Semiconductor.
The 74HCT640D,652 belongs to the 74HCT family of TTL-compatible CMOS logic devices designed specifically for robust, low-power, pin-compatible upgrades of legacy LSTTL systems in harsh industrial and automotive environments.
FAQ
What is the operating temperature range for the 74HCT640D,652?
The 74HCT640D,652 is rated for operation from −40 °C to +85 °C, meeting industrial-grade environmental requirements. This range is validated across all AC and DC specifications in the official NXP datasheet, including propagation delay, 3-state timing, and output drive capability - ensuring reliability in factory automation and vehicle under-hood applications where thermal stability is critical.
Does the 74HCT640D,652 support 3.3 V logic interfacing?
No, the 74HCT640D,652 does not support 3.3 V logic interfacing. It is specified only for VCC = 4.5–5.5 V and requires TTL-compatible input voltages (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Direct connection to 3.3 V systems risks undefined operation or excessive input current; level-shifting circuitry is required for interoperability with 3.3 V microcontrollers or FPGAs.
How does the inversion behavior of the 74HCT640D,652 affect system timing?
The 74HCT640D,652 inverts data on both A→B and B→A paths, adding one gate delay to each direction. This inversion is fully accounted for in the published tPHL/tPLH values (11 ns typical), so no additional timing margin is needed beyond datasheet-specified delays. System-level timing budgets must treat the 74HCT640D,652 as a deterministic inverting buffer - not a combinational logic element requiring extra setup/hold analysis.
Can the 74HCT640D,652 replace a 74LS640 in existing designs?
Yes, the 74HCT640D,652 is pin compatible and electrically compatible with the 74LS640, offering identical pinout, 3-state behavior, and direction control. It improves upon LS technology with lower ICC, higher noise immunity, and better fan-out capability (±25 mA vs. ±15 mA), while maintaining the same 5 V supply and TTL input thresholds - enabling direct drop-in replacement without layout changes.
What is the maximum capacitive load the 74HCT640D,652 can drive reliably?
The 74HCT640D,652 is characterized for reliable operation with up to 50 pF per output, as confirmed in AC specifications (tPHL, tPZH, etc.). Driving loads exceeding 50 pF may increase propagation delay, degrade edge rates, or cause overshoot/undershoot. For heavier loads, external series termination or buffer staging is recommended - the 74HCT640D,652 itself does not include slew-rate control or programmable drive strength.
74HCT640D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74HCT640D,652 FAQ
1.How can I place an order for 74HCT640D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT640D,652 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 74HCT640D,652 reliable?
The price and inventory of 74HCT640D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT640D,652 is usually 5 days.
3.What payment methods are accepted for 74HCT640D,652?
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4.How is shipping managed for 74HCT640D,652?
74HCT640D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT640D,652 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 74HCT640D,652?
For technical support, including 74HCT640D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT640D,652 requirements.
6.How does Aetrix verify that 74HCT640D,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT640D,652 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 74HCT640D,652 meets industry standards.
7.What is the process for return or replacement of 74HCT640D,652?
All 74HCT640D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT640D,652, 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 74HCT640D,652 part is unused and in its original packaging.
Return procedure for 74HCT640D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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