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NXP Semiconductors 74HC640D,652
- Part No.:
- 74HC640D,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC640D,652.pdf
- Description:
- IC TRANSCEIVER INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,493
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Product details
Overview
74HC640D,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 2.0–6.0 V supply range. Used in legacy industrial control backplanes and memory-mapped I/O expansion interfaces.
For engineers reviewing the 74HC640D,652 datasheet, 74HC640D,652 pinout, 74HC640D,652 application, or 74HC640D,652 equivalent, key selection criteria include inverting logic behavior, 3-state isolation timing (tPZH/tPHZ ≤ 45 ns), bus driver output capability, and compatibility with LSTTL-level systems via HCT variant options.
Technical Context
The 74HC640D,652 implements dual-directional data transfer using a single DIR input to select A→B (inverting) or B→A (inverting) paths, with OE enabling/disabling all outputs simultaneously into high-impedance state. Its CMOS Si-gate process ensures low static current and TTL-compatible voltage thresholds when operated as HCT.
Propagation delays are symmetric for both directions (An↔Bn), and 3-state enable/disable times are specified under CL = 50 pF load. The device belongs to the MSI (Medium Scale Integration) category and complies with JEDEC standard No. 7A for pinout and logic behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HC high-speed CMOS; compatible with LSTTL pinout and function |
| Supply Voltage Range | 2.0 V to 6.0 V; supports mixed-voltage system interfacing |
| Propagation Delay (tPHL/tPLH) | 9 ns typical at VCC = 5 V, CL = 15 pF; enables ≤37 MHz bus operation |
| 3-State Enable Time (tPZH) | 16 ns typical at VCC = 4.5 V, CL = 50 pF; critical for burst-mode bus arbitration |
| Input Capacitance (CI) | 3.5 pF; minimizes loading on driving logic stages |
| Power Dissipation Cap. (CPD) | 35 pF per transceiver; used to calculate dynamic power at given clock/data rates |
| Output Drive Capability | Bus driver level (±6 mA at VCC = 4.5 V); drives standard PCB traces and multiple TTL inputs |
Pinout & Package
74HC640D,652 is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package, 7.5 mm wide, with standard 1.27 mm pitch and JEDEC MS-013AC outline compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables A→B path; HIGH enables B→A path (both paths invert) |
| 2–9 | A0–A7 | Bidirectional I/O port A: data source/sink depending on DIR state; high-impedance when OE = HIGH |
| 10 | GND | Ground reference for all internal circuitry and I/O |
| 11–18 | B0–B7 | Bidirectional I/O port B: complements A-port behavior; inverted relative to A-port during transfer |
| 19 | OE | Active-low output enable: HIGH forces all A/B pins into high-impedance state regardless of DIR |
| 20 | VCC | Positive supply rail: powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Inverting bidirectional data path | Each transferred byte is inverted in both A→B and B→A directions - simplifies complement-based arithmetic interfaces |
| Independent 3-state control | OE and DIR operate orthogonally: OE isolates buses unconditionally; DIR selects direction without affecting output state |
| Low dynamic power consumption | CPD = 35 pF enables predictable µW-level power estimation across varying data activity and frequency |
| TTL-compatible input thresholds (HCT variant) | HCT version accepts standard TTL logic levels (0.8 V/2.0 V), allowing direct replacement in legacy LSTTL systems |
| JEDEC 7A-compliant pinout | Ensures mechanical and functional interchangeability with industry-standard octal transceivers including 74LS640 and 74ALS640 |
Applications
| Industrial Backplane Interface | Legacy Memory-Mapped I/O Expansion |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral card slots in modular PLC chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing 8-bit data exchange between master controller and slave modules with directional arbitration. Use Value: Inverting behavior matches legacy complement-addressing schemes; 3-state isolation prevents bus contention during hot-swap events. | Use Scenario: Adding parallel I/O ports to microcontroller-based instrumentation systems using discrete latch and buffer logic. IC Role / Device Role / Timing Role: Octal transceiver providing controlled data flow between microcontroller data bus and external GPIO expanders or ADC/DAC peripherals. Use Value: Symmetric propagation delay (9 ns) ensures deterministic timing margins; bus-driver output strength supports long trace runs on 4-layer PCBs. |
| Microprocessor System Bus Buffering | Test Equipment Signal Routing Matrix |
Use Scenario: Buffering and direction-controlling shared data bus among Z80, 8085, or 68000 family CPUs and co-processors. IC Role / Device Role / Timing Role: Inverting transceiver enabling bidirectional data mirroring between CPU and math coprocessor or DMA controller. Use Value: DIR and OE pins allow precise cycle-by-cycle bus ownership handoff; tPZH ≤ 18 ns meets tight setup/hold timing in 4–6 MHz CPU systems. | Use Scenario: Configurable signal routing in automated test equipment where DUT interface signals must be dynamically connected to measurement or stimulus channels. IC Role / Device Role / Timing Role: Reconfigurable 8-bit bus switch implementing programmable interconnect paths under microcontroller control. Use Value: High-impedance isolation (Z-state) eliminates crosstalk between unused paths; inverting logic allows polarity correction without additional gates. |
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 |
|---|---|---|---|
| 74HCT640D,653 | TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V); identical pinout and AC specs | Required when interfacing directly with 5 V TTL or LSTTL logic without level shifters | Select 74HCT640D,653 for mixed-logic systems where input noise margin and legacy compatibility outweigh pure CMOS power benefits |
| SN74LVTH16640DGGR | 16-bit, non-inverting, 3.3 V only, LVTH family; different pin count (48-pin TSSOP) and no DIR/OE pin mapping overlap | Used in modern low-voltage, high-density board designs requiring higher channel count and lower voltage operation | Choose SN74LVTH16640DGGR only when upgrading to 3.3 V systems and doubling bus width - not a drop-in replacement |
Compared with 74HC640D,652, the 74HCT640D,653 offers identical functionality with improved input compatibility for legacy TTL, while the SN74LVTH16640DGGR provides double the width and lower voltage operation but requires PCB redesign and logic inversion compensation.
Availability
74HC640D,652 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor I/O expansion, and test equipment signal routing requiring stable component supply and long-term obsolescence management.
Supply support for 74HC640D,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 formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions and high-reliability logic and analog components.
The 74HC/HCT640 series was developed to provide pin- and function-compatible CMOS alternatives to legacy TTL bus transceivers, targeting industrial control, instrumentation, and retro-computing system upgrades.
FAQ
What is the supply voltage range supported by the 74HC640D,652?
The 74HC640D,652 operates over a supply voltage range of 2.0 V to 6.0 V. This wide range allows integration into mixed-voltage systems and ensures compatibility with both 3.3 V and 5 V logic families. At VCC = 5 V, the device delivers its specified 9 ns typical propagation delay and ±6 mA output drive capability. Operation below 2.0 V is not guaranteed per the March 1988 Philips datasheet.
Does the 74HC640D,652 have inverting or non-inverting data paths?
The 74HC640D,652 features inverting data paths in both directions: A→B and B→A transfers invert the input data. This behavior is inherent to the "640" family design and distinguishes it from the non-inverting 74HC245. The inversion occurs regardless of DIR state, and is confirmed in the functional diagram and truth table of the original Philips datasheet.
How does the DIR and OE pin interaction work on the 74HC640D,652?
On the 74HC640D,652, OE (pin 19) has priority over DIR (pin 1): when OE is HIGH, all A and B pins enter high-impedance state regardless of DIR value. When OE is LOW, DIR determines direction - LOW enables A→B transfer, HIGH enables B→A transfer. Both paths remain inverting, and neither pin affects the other's electrical behavior.
Is the 74HC640D,652 pin-compatible with older TTL versions like 74LS640?
Yes, the 74HC640D,652 is pin-compatible with 74LS640 and other JEDEC-standard octal inverting transceivers. It follows JEDEC Standard No. 7A for pin assignment, including identical DIR, OE, A0–A7, B0–B7, VCC, and GND locations. However, due to CMOS input structure, it does not tolerate negative input voltages or excessive current injection like bipolar TTL parts.
What is the maximum capacitive load the 74HC640D,652 can drive reliably?
The 74HC640D,652 is characterized up to CL = 50 pF for AC timing parameters such as propagation delay and 3-state switching. Its bus driver output capability supports driving standard PCB traces and multiple TTL inputs, with guaranteed ±6 mA output current at VCC = 4.5 V. For loads exceeding 50 pF, propagation delay increases linearly - actual performance must be verified under target trace capacitance and termination conditions.
74HC640D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74HC640D,652 FAQ
1.How can I place an order for 74HC640D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC640D,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 74HC640D,652 reliable?
The price and inventory of 74HC640D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC640D,652 is usually 5 days.
3.What payment methods are accepted for 74HC640D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC640D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC640D,652?
74HC640D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC640D,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 74HC640D,652?
For technical support, including 74HC640D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC640D,652 requirements.
6.How does Aetrix verify that 74HC640D,652 is sourced from the original manufacturer or authorized distributors?
All 74HC640D,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 74HC640D,652 meets industry standards.
7.What is the process for return or replacement of 74HC640D,652?
All 74HC640D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC640D,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 74HC640D,652 part is unused and in its original packaging.
Return procedure for 74HC640D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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