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NXP Semiconductors 74HC640D,653
- Part No.:
- 74HC640D,653
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC640D,653.pdf
- Description:
- IC TRANSCEIVER INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,488
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Product details
Overview
74HC640D,653 from NXP Semiconductors 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 5 V, 3.5 pF input capacitance, and operates across −40 °C to +125 °C. Used in industrial backplane interfaces requiring level-shifted, isolated bus communication.
For engineers reviewing the 74HC640D,653 datasheet, 74HC640D,653 pinout, 74HC640D,653 application, or 74HC640D,653 equivalent, key selection criteria include inverting logic behavior, 3-state isolation timing (tPZH/tPHZ ≤ 45 ns), supply voltage range (2.0–6.0 V), and SO20 package compatibility with legacy TTL bus systems.
Technical Context
The 74HC640D,653 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 active low. Its CMOS silicon-gate architecture ensures LSTTL pin compatibility while delivering lower ICC than bipolar equivalents.
Propagation delays are symmetric for both directions (An↔Bn), and 3-state enable/disable times are specified under load (CL = 50 pF). The device belongs to the MSI logic category and supports bus driver output capability without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HC high-speed CMOS, TTL-compatible input thresholds |
| Propagation Delay | 9 ns typical (An↔Bn, VCC = 5 V, CL = 15 pF) - enables 100+ MHz bus handshaking |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing |
| Input Capacitance | 3.5 pF - minimizes loading on upstream drivers in dense bus layouts |
| 3-State Enable Time | 13 ns typical (OE/DIR → output, VCC = 4.5 V, CL = 50 pF) - critical for glitch-free bus arbitration |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and automotive under-hood use |
| Output Drive | Bus driver capability (±6 mA at VCC = 4.5 V) - drives standard 50 pF loads without buffers |
Pinout & Package
74HC640D,653 is housed in a 20-pin small outline integrated circuit (SO20) package with 0.65 mm pitch, JEDEC MS-013 compliant outline, and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: LOW enables A→B path; HIGH enables B→A path (both paths invert) |
| 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 for all logic and power domains |
| 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: HIGH forces all A/B pins into high-impedance state |
| 20 | VCC | Positive supply: powers internal logic and output drivers (2.0–6.0 V) |
Key Features
| Feature | Design Value |
|---|---|
| Inverting bidirectional data path | Ensures signal polarity consistency across both directions without external inversion logic |
| Independent DIR and OE controls | Enables precise timing separation between direction switching and bus release (no bus contention) |
| Low dynamic power dissipation | CPD = 35 pF per transceiver - reduces thermal load in high-density bus repeater designs |
| LSTTL pin compatibility | Direct replacement for 74LS640 in existing PCBs without layout changes |
| Wide temperature operation | Validated from −40 °C to +125 °C - suitable for uncontrolled industrial enclosures |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Connecting microcontroller local bus to modular I/O chassis over 20 cm routed traces. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver isolating CPU and peripheral modules during hot-swap events. Use Value: 3-state disable time (≤45 ns) prevents data corruption during module insertion/removal sequences. | Use Scenario: Extending 8-bit ISA-style address/data bus between two PCBs in test equipment rack. IC Role / Device Role / Timing Role: Inverting bus repeater enabling signal integrity restoration across split-plane interconnects. Use Value: Propagation delay symmetry (An↔Bn ≤9 ns) maintains setup/hold timing margins across extended trace lengths. |
| Automotive ECU Subsystem Link | Programmable Logic Controller (PLC) I/O Expansion |
Use Scenario: Interfacing CAN controller MCU to analog sensor cluster via shielded ribbon cable. IC Role / Device Role / Timing Role: Direction-controlled isolation buffer preventing ground loop currents between subsystems. Use Value: −40 °C to +125 °C rating ensures reliable operation near engine bay electronics. | Use Scenario: Adding remote digital I/O bank to main PLC CPU board using DIN-rail mounted carrier. IC Role / Device Role / Timing Role: Bus transceiver managing data flow between CPU and expansion module over 30 cm flex cable. Use Value: 3.5 pF input capacitance minimizes signal rise-time degradation in multi-drop configurations. |
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 min); higher ICC at VCC = 4.5 V | Better noise immunity in noisy 5 V systems with marginal logic levels | Select when interfacing with legacy 74LS or 74F logic families |
| SN74HC640N | DIP-20 package; identical AC/DC specs but no moisture sensitivity level (MSL) rating | Prototyping and through-hole production only; not suitable for reflow assembly | Select for breadboard validation or low-volume manual assembly |
Compared with 74HC640D,653, the 74HCT640D,653 offers improved input noise margin in mixed-logic systems, while SN74HC640N provides identical functionality in through-hole form-neither is pin-compatible with SO20 footprints used by 74HC640D,653.
Availability
74HC640D,653 is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive ECU subsystem links, and programmable logic controller (PLC) I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC640D,653 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' semiconductor division.
The 74HC640D,653 belongs to the 74HC/HCT logic family, engineered for high-speed, low-power, TTL-compatible digital interfacing in space-constrained and thermally demanding environments.
FAQ
What logic family does the 74HC640D,653 belong to, and how does it differ from 74HCT variants?
The 74HC640D,653 belongs to the 74HC high-speed CMOS logic family, featuring CMOS input thresholds (VIH ≥ 70% VCC). Unlike the 74HCT640D,653, which uses TTL-compatible inputs (VIH = 2.0 V min at VCC = 4.5 V), the 74HC640D,653 draws lower quiescent current and exhibits tighter propagation delay variation across voltage and temperature. Both share identical pinout and function.
Does the 74HC640D,653 support bidirectional data flow without external logic inversion?
Yes, the 74HC640D,653 natively supports bidirectional inverted data flow: when DIR = LOW, A0–A7 drive inverted data to B0–B7; when DIR = HIGH, B0–B7 drive inverted data to A0–A7. No external inverters are needed - the inversion is built into both transmission paths per the function table.
What is the maximum recommended capacitive load for stable operation of the 74HC640D,653?
The 74HC640D,653 is characterized up to 50 pF load capacitance (CL) in AC specifications, with propagation delay and transition time guaranteed under that condition. Driving >50 pF may increase tPLH/tPHL beyond 23 ns and degrade edge rates; for heavier loads, consider buffering or reducing trace length and stubs.
Can the 74HC640D,653 be used with a 3.3 V supply, and what performance trade-offs apply?
Yes, the 74HC640D,653 operates from 2.0 V to 6.0 V, including 3.3 V. At VCC = 3.3 V, propagation delay increases to ~15 ns (typical), output drive strength drops to ±4 mA, and noise margins narrow slightly. All DC and AC specs remain valid per datasheet tables across the full voltage range.
Is the 74HC640D,653 pin-compatible with the non-inverting 74HC245?
No - although both are octal 3-state transceivers in SO20 packages, the 74HC640D,653 has inverting outputs and different pin mapping: DIR is on pin 1 (vs. pin 19 on 74HC245), and OE is on pin 19 (vs. pin 1 on 74HC245). Signal inversion and pin assignment differences prevent direct substitution without PCB redesign.
74HC640D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,653 FAQ
1.How can I place an order for 74HC640D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC640D,653 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,653 reliable?
The price and inventory of 74HC640D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC640D,653 is usually 5 days.
3.What payment methods are accepted for 74HC640D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC640D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC640D,653?
74HC640D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC640D,653 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,653?
For technical support, including 74HC640D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC640D,653 requirements.
6.How does Aetrix verify that 74HC640D,653 is sourced from the original manufacturer or authorized distributors?
All 74HC640D,653 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,653 meets industry standards.
7.What is the process for return or replacement of 74HC640D,653?
All 74HC640D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC640D,653, 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,653 part is unused and in its original packaging.
Return procedure for 74HC640D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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