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NXP Semiconductors 74HC640N,652
- Part No.:
- 74HC640N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC640N,652.pdf
- Description:
- IC TRANSCEIVER INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,793
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Product details
Overview
74HC640N,652 from NXP Semiconductors (formerly Philips) is an octal inverting bus transceiver with 3-state outputs, designed for bidirectional data flow control between two 8-bit buses. It features direction control (DIR), active-low output enable (OE), propagation delay of 9 ns at VCC = 5 V, and operates across −40 °C to +125 °C. It serves in legacy industrial backplane interfaces requiring level-shifted, isolated bus communication.
For engineers reviewing the 74HC640N,652 datasheet, 74HC640N,652 pinout, 74HC640N,652 application, or 74HC640N,652 equivalent, key selection criteria include verified 3-state timing (tPZH/tPLZ ≤ 45 ns), inverting logic behavior, HC-family voltage compatibility (2.0–6.0 V), and DIP-20 package mechanical fit for through-hole PCBs.
Technical Context
The 74HC640N,652 implements dual-directional data transfer using a single DIR input to select A→B (inverting) or B→A (inverting) paths, with OE asserting high-impedance on all outputs when HIGH. Its CMOS Si-gate process ensures TTL-level compatibility while delivering low dynamic power via CPD = 35 pF per transceiver.
It complies with JEDEC standard No. 7A and supports cascading via OE and DIR signal routing. Unlike the non-inverting 74HC245, the 74HC640N,652 inverts data on both transmit and receive paths - a fixed architectural trait confirmed in its functional diagram and truth table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HC - high-speed CMOS compatible with LSTTL pinout and voltage thresholds |
| Propagation Delay (tPHL/tPLH) | 9 ns typical at VCC = 5 V, CL = 15 pF - enables ≤35 MHz bus operation in synchronous systems |
| 3-State Enable/Disable Time | tPZH/tPLZ = 45 ns max at −40 to +125 °C - defines minimum bus turnaround interval |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage board designs and battery-backed operation |
| Input Capacitance (CI) | 3.5 pF - limits capacitive loading on driving gates and preserves signal edge integrity |
| Power Dissipation Cap. (CPD) | 35 pF per transceiver - used to calculate dynamic power: PD = CPD × VCC² × fi + Σ(CL × VCC² × fo) |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
DIP-20 plastic dual in-line package (PDIP), 2.54 mm pitch, 7.62 mm body width, 24.2 mm length - compliant with JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW enables A→B path; HIGH enables B→A path - determines data flow polarity |
| 2–9 (A0–A7) | Bidirectional I/O port A | Inputs when DIR selects B→A; outputs (inverted) when DIR selects A→B |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers |
| 11–18 (B0–B7) | Bidirectional I/O port B | Inputs when DIR selects A→B; outputs (inverted) when DIR selects B→A |
| 19 (OE) | Active-low output enable | LOW enables outputs; HIGH forces all A/B pins into high-impedance state for bus isolation |
| 20 (VCC) | Positive supply | Primary power rail (2.0–6.0 V); powers internal logic and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| Inverting bidirectional data path | Data inverted on both A→B and B→A transfers - eliminates need for external inverters in parity or checksum circuits |
| Pin-compatible with 74LS640 and 74ALS640 | Enables drop-in replacement in legacy TTL-based backplanes without PCB redesign |
| 3-state bus isolation via OE and DIR | Simultaneous control of direction and output drive allows deterministic bus arbitration in multi-master systems |
| Low ICC category (MSI) | Supports dense logic integration with predictable quiescent current draw per unit load |
| JEDEC Std. 7A compliance | Guarantees interoperability with industry-standard test equipment, socketing, and system-level timing models |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Connecting CPU local bus to peripheral expansion slots in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional bus transceiver isolating address/data lines between master and slave modules during hot-swap events. Use Value: 3-state disable time ≤45 ns ensures clean bus release before next cycle, preventing data contention in 8-bit ISA-style architectures. | Use Scenario: Extending 8-bit microcontroller bus to external memory or I/O peripherals in retro-computing restoration projects. IC Role / Device Role / Timing Role: Inverting transceiver enabling shared bus access between Z80 and 6502 subsystems with voltage-level translation. Use Value: 2.0–6.0 V supply range permits direct interface to both 5 V TTL and 3.3 V logic domains without level shifters. |
| Automotive ECU Diagnostics Port | Test Equipment Signal Routing |
Use Scenario: Isolating diagnostic CAN or K-Line signals from main ECU processor during firmware update sequences. IC Role / Device Role / Timing Role: Direction-controlled buffer managing bidirectional serial protocol handshaking under ISO 9141-2 timing constraints. Use Value: −40 °C to +125 °C rating ensures reliable operation in engine bay-mounted diagnostic adapters. | Use Scenario: Routing multiple instrument signals (e.g., oscilloscope triggers, function generator outputs) through a single test fixture. IC Role / Device Role / Timing Role: High-impedance bus switch enabling multiplexed signal path selection without crosstalk. Use Value: 3.5 pF input capacitance minimizes signal distortion on fast edges up to 35 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT640N,652 | TTL-input compatible (VIH = 2.0 V min); identical pinout, timing, and function | Preferred where driving logic is 5 V TTL or LSTTL; same PCB layout but different input threshold behavior | Select when interfacing with legacy 74LS/74ALS families to guarantee VIH/VIL margins |
| SN74LVTH16640DGGR | 16-bit, non-inverting, 3.3 V only, TSSOP-48; higher density, no DIR/OE pin sharing | Used in space-constrained 3.3 V systems requiring wider bus width; not pin-compatible or functionally identical | Choose only for new 3.3 V designs needing >8-bit width and lower voltage operation - requires full redesign |
Compared with 74HC640N,652, the 74HCT640N,652 offers guaranteed TTL input compatibility at identical timing and packaging, while the SN74LVTH16640DGGR provides higher channel count and lower voltage support but demands layout and voltage domain changes.
Availability
74HC640N,652 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and automotive ECU diagnostics ports requiring stable component supply across long-lifecycle programs.
Supply support for 74HC640N,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 roots in Philips' pioneering logic IC development.
The 74HC640N,652 belongs to NXP's legacy 74HC/HCT logic family - engineered for pin- and function-compatible replacement of obsolete TTL devices in cost-sensitive, long-lifecycle industrial control systems.
FAQ
What is the supply voltage range supported by the 74HC640N,652?
The 74HC640N,652 operates over a supply voltage range of 2.0 V to 6.0 V. This wide range allows it to interface reliably with both 3.3 V and 5 V logic domains without external level-shifting circuitry. The device maintains specified AC and DC performance across this entire range, as validated in the AC characteristics tables for VCC = 2.0 V, 4.5 V, and 6.0 V conditions.
Does the 74HC640N,652 support bidirectional data transfer without external inversion?
Yes - the 74HC640N,652 performs inverting bidirectional data transfer natively. When DIR = LOW, A inputs are inverted and driven onto B outputs; when DIR = HIGH, B inputs are inverted and driven onto A outputs. No external inverters are needed, making it ideal for parity generation, checksum computation, or differential bus signaling where consistent inversion is required in both directions.
What is the maximum operating temperature for the 74HC640N,652?
The 74HC640N,652 is rated for operation from −40 °C to +125 °C. This extended temperature range is explicitly confirmed in the AC characteristics tables for both 74HC and 74HCT variants. It qualifies the device for use in under-hood automotive modules, industrial motor drives, and outdoor telecom infrastructure where ambient thermal stress exceeds commercial-grade limits.
How does the 74HC640N,652 differ from the 74HC245 in functionality?
The 74HC640N,652 differs from the 74HC245 by providing inverting outputs in both directions, whereas the 74HC245 is non-inverting. Both share identical pinout, DIR/OE control, and 3-state behavior, but the 74HC640N,652's inversion is hardwired - critical for applications requiring complementary signal pairs or built-in logic negation without adding discrete inverters.
Is the 74HC640N,652 pin-compatible with older TTL versions like 74LS640?
Yes - the 74HC640N,652 is pin-compatible with 74LS640 and 74ALS640, as stated in the general description and confirmed by identical pin numbering and function mapping (DIR, OE, A0–A7, B0–B7, GND, VCC). This allows direct replacement in existing TTL-based designs, provided supply voltage and timing margins are re-verified for the CMOS version's lower power and faster switching.
74HC640N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HC640N,652 FAQ
1.How can I place an order for 74HC640N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC640N,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 74HC640N,652 reliable?
The price and inventory of 74HC640N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC640N,652 is usually 5 days.
3.What payment methods are accepted for 74HC640N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC640N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC640N,652?
74HC640N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC640N,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 74HC640N,652?
For technical support, including 74HC640N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC640N,652 requirements.
6.How does Aetrix verify that 74HC640N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC640N,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 74HC640N,652 meets industry standards.
7.What is the process for return or replacement of 74HC640N,652?
All 74HC640N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC640N,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 74HC640N,652 part is unused and in its original packaging.
Return procedure for 74HC640N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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