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NXP Semiconductors 74HCT640N,652
- Part No.:
- 74HCT640N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT640N,652.pdf
- Description:
- IC TRANSCEIVER INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
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Product details
Overview
74HCT640N,652 from NXP Semiconductors (formerly Philips) 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 (typ.) at VCC = 4.5 V, 3-state output isolation, and TTL-compatible input thresholds. It is commonly deployed in legacy industrial backplane interfaces and memory-mapped I/O expansion.
For engineers reviewing the 74HCT640N,652 datasheet, 74HCT640N,652 pinout, 74HCT640N,652 application, or 74HCT640N,652 equivalent, key selection criteria include verified 3-state timing (tPZH/tPHZ), DIR/OE logic interaction, inverting data path behavior, bus driver output capability, and compatibility with 5 V LSTTL systems.
Technical Context
The 74HCT640N,652 implements a dual-directional inverting transceiver architecture with separate DIR and OE controls: DIR selects data flow direction (A→B or B→A), while OE independently enables/disables all outputs into high-impedance state. Its HCT logic family ensures TTL-level input compatibility (VIH = 2.0 V min, VIL = 0.8 V max) at VCC = 4.5–5.5 V.
Each of the eight A/B port pairs performs bitwise inversion during transmission - e.g., A0 drives inverted signal to B0 when DIR = LOW and OE = LOW. Propagation delays are symmetric (An↔Bn), and 3-state transition times (tPZH/tPHZ) are specified down to −40 °C and up to +125 °C for industrial operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - supports standard 5 V TTL/CMOS mixed-signal systems without level shifting |
| tPHL/tPLH (typ.) | 11 ns at VCC = 4.5 V, CL = 50 pF - enables reliable 30 MHz bus handshaking in synchronous designs |
| tPZH/tPHZ (max) | 45 ns at −40 °C to +125 °C - guarantees deterministic 3-state settling across full industrial temperature range |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - ensures robust noise margin and direct interfacing with 74LS/74ALS logic families |
| Output Drive | Bus driver capability (±6 mA IOH/IOL at VCC = 4.5 V) - sustains signal integrity across 10+ cm PCB traces loaded with 50 pF |
| Logic Function | Inverting transceiver with DIR/OE dual-control - eliminates need for external inverters in bidirectional address/data multiplexing |
Pinout & Package
74HCT640N,652 is supplied in a 20-pin plastic dual in-line package (PDIP) with 0.3 inch body width and standard through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | LOW enables A→B data flow; HIGH enables B→A; determines inversion path orientation |
| A0–A7 (Pins 2–9) | Port A data I/O | Input when DIR = HIGH and OE = LOW; output (inverted) when DIR = LOW and OE = LOW |
| GND (Pin 10) | Ground reference | 0 V return for all internal logic and output drivers; must be low-inductance connection |
| B0–B7 (Pins 11–18) | Port B data I/O | Input when DIR = LOW and OE = LOW; output (inverted) when DIR = HIGH and OE = LOW |
| OE (Pin 19) | Output enable (active LOW) | Drives all A/B outputs to high-impedance when HIGH; overrides DIR state for bus isolation |
| VCC (Pin 20) | Positive supply | 5 V nominal power rail; requires local 100 nF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Inverting bidirectional data path | Eliminates external inverters in address latching or checksum feedback loops where complemented bus values are required |
| Independent DIR and OE controls | Enables simultaneous bus arbitration and direction switching - e.g., release bus (OE HIGH), change DIR, then re-enable (OE LOW) |
| TTL-compatible input thresholds | Direct drop-in replacement for 74LS245 in legacy upgrades without redesigning upstream drivers |
| Industrial temperature range support | Guaranteed operation from −40 °C to +125 °C makes it suitable for motor control cabinets and outdoor telecom enclosures |
| MSI-level integration density | Integrates eight independent inverting transceivers plus dual control logic in one 20-pin IC - reduces board area vs discrete solutions |
Applications
| Industrial Backplane Interface | Legacy Memory-Mapped I/O Expansion |
|---|---|
Use Scenario: Isolating and routing parallel data between CPU bus and peripheral modules in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional inverting transceiver managing 8-bit data/address lines with precise 3-state timing to prevent bus contention during module hot-swap. Use Value: DIR/OE separation allows safe bus release before direction reversal; 45 ns max tPHZ ensures clean hold-off during multi-cycle handshake protocols. | Use Scenario: Extending microcontroller GPIOs to drive external peripherals (ADCs, DACs, displays) via shared 8-bit data bus. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled interface between 5 V MCU ports and legacy 5 V peripherals requiring inverted control signals. Use Value: Inverting function directly satisfies /WR or /RD polarity requirements without added gates; ±6 mA drive sustains signal integrity over 15 cm ribbon cable runs. |
| Automotive ECU Diagnostic Port | Test Equipment Bus Arbitration |
Use Scenario: Enabling bidirectional communication between diagnostic tool and ECU over standardized 8-bit parallel test interface (e.g., ISO 9141-2 auxiliary mode). IC Role / Device Role / Timing Role: Isolating diagnostic host from ECU internal bus during non-active sessions using OE control; DIR manages command/response flow direction. Use Value: Guaranteed −40 °C to +125 °C operation meets AEC-Q100 ambient requirements; 11 ns typical propagation supports real-time response in boot-loader verification sequences. | Use Scenario: Sharing a single logic analyzer channel across multiple DUTs by dynamically enabling/disabling transceiver paths. IC Role / Device Role / Timing Role: High-impedance isolation gate for multiplexing captured waveforms from up to eight DUTs onto one acquisition line. Use Value: 3-state disable time (tPHZ ≤ 45 ns) ensures no signal bleed between DUT captures; low input capacitance (3.5 pF) minimizes loading on high-speed probe points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245N,652 | Non-inverting data path; identical pinout, timing, and DC specs | Requires external inversion if system logic expects complemented bus values | Select when bidirectional data must retain original polarity (e.g., transparent memory read/write paths) |
| SN74HCT640N | Same logic function, timing, and pinout; manufactured by Texas Instruments | No functional difference; validated for same industrial temperature range and 5 V operation | Preferred for dual-sourcing or TI-aligned BOMs; identical electrical behavior to 74HCT640N,652 |
Compared with 74HCT245N,652, the 74HCT640N,652 provides inherent inversion critical for checksum, parity, or address decoding workflows - eliminating two external inverters per byte. Against SN74HCT640N, it offers identical functionality with NXP-specific traceability and long-term industrial support documentation.
Availability
74HCT640N,652 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory-mapped I/O expansion, automotive ECU diagnostic ports, and test equipment bus arbitration requiring stable component supply and long-lifecycle support.
Supply support for 74HCT640N,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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' semiconductor division.
The 74HCT640N,652 belongs to NXP's legacy 74HCT logic family, designed specifically for robust 5 V mixed-signal interfacing in industrial control, instrumentation, and retro-computing systems requiring TTL compatibility and extended temperature operation.
FAQ
What is the operating voltage range for the 74HCT640N,652?
The 74HCT640N,652 operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V TTL and CMOS systems while maintaining guaranteed performance across industrial temperatures. Operation outside this range may result in undefined logic states or degraded timing margins - always verify VCC stability within ±5 % under load for reliable 74HCT640N,652 operation.
Does the 74HCT640N,652 support true bidirectional data flow?
Yes, the 74HCT640N,652 supports true bidirectional data flow via its DIR pin: when DIR = LOW, data passes from A-port to B-port (inverted); when DIR = HIGH, data flows from B-port to A-port (also inverted). The OE pin independently places all outputs in high-impedance state regardless of DIR, enabling bus sharing. This dual-control mechanism is fully documented in the 74HCT640N,652 function table and verified across temperature ranges.
Is the 74HCT640N,652 pin compatible with the 74HCT245?
Yes, the 74HCT640N,652 is pin compatible with the 74HCT245 in the same 20-pin PDIP package, sharing identical pin assignments for VCC, GND, DIR, OE, and all A/B port terminals. However, the 74HCT640N,652 performs bitwise inversion while the 74HCT245 does not - this functional difference must be accounted for in signal path design when substituting the 74HCT640N,652.
What is the maximum propagation delay of the 74HCT640N,652 over temperature?
The maximum propagation delay (tPHL/tPLH) for the 74HCT640N,652 is 33 ns at VCC = 4.5 V and CL = 50 pF over the full industrial temperature range (−40 °C to +125 °C). This value is specified in the official NXP AC characteristics table and applies equally to both A→B and B→A signal paths, ensuring predictable timing in safety-critical bus arbitration circuits using the 74HCT640N,652.
Can the 74HCT640N,652 drive standard 50 pF loads reliably?
Yes, the 74HCT640N,652 is characterized with CL = 50 pF in all AC timing specifications, including propagation delay, 3-state enable/disable times, and output transition times. Its bus driver output capability (±6 mA at VCC = 4.5 V) ensures stable edge rates and minimal overshoot into 50 pF loads - a condition explicitly tested and guaranteed in the 74HCT640N,652 datasheet under industrial temperature extremes.
74HCT640N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HCT640N,652 FAQ
1.How can I place an order for 74HCT640N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT640N,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 74HCT640N,652 reliable?
The price and inventory of 74HCT640N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT640N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT640N,652?
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4.How is shipping managed for 74HCT640N,652?
74HCT640N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT640N,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 74HCT640N,652?
For technical support, including 74HCT640N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT640N,652 requirements.
6.How does Aetrix verify that 74HCT640N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT640N,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 74HCT640N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT640N,652?
All 74HCT640N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT640N,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 74HCT640N,652 part is unused and in its original packaging.
Return procedure for 74HCT640N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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