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Toshiba Semiconductor and Storage TC74AC640FTEL
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- Part No.:
- TC74AC640FTEL
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TC74AC640FTEL.pdf
- Description:
- IC TXRX INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
TC74AC640FTEL from Toshiba Electronic Devices & Storage Corporation is an octal bus transceiver with 3-state inverting output logic, designed for bidirectional asynchronous data bus communication between two 8-bit systems. It operates across 2.0–5.5 V supply, delivers 24 mA output drive at 4.5 V, and achieves 4.8 ns typical propagation delay at 5.0 V - enabling high-speed interface isolation in industrial control backplanes.
For engineers reviewing the TC74AC640FTEL datasheet, TC74AC640FTEL pinout, TC74AC640FTEL application, or TC74AC640FTEL equivalent, key selection criteria include its inverting transceiver function, SOP20 package compatibility with 74F640, wide voltage operation, and guaranteed 3-state isolation timing (tPZL/tPZH ≤ 7.0 ns typ. at 5.0 V).
Technical Context
The TC74AC640FTEL implements a dual-bus directional interface controlled by DIR and active-low G inputs: DIR = L enables A→B data flow with inversion; DIR = H enables B→A with inversion; G = H forces all outputs into high-impedance state. Its C2MOS silicon gate process ensures TTL-compatible speed without bipolar power penalties.
All 16 I/O pins are protected against ESD and transient overvoltage, and the device requires external pull-up/pull-down resistors on floating bus lines per design guidelines. Propagation delays tPLH and tPHL are balanced (≤0.5 ns skew), supporting clean signal integrity in synchronous bus handshaking applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal 3-state inverting bus transceiver - supports bidirectional data transfer with polarity inversion on both directions |
| Propagation Delay | 4.8 ns (typ.) at VCC = 5.0 V - enables ≤200 MHz bus toggle rates in point-to-point configurations |
| Supply Voltage Range | 2.0 V to 5.5 V - interoperable with 3.3 V and 5 V logic domains without level shifters |
| Output Drive | ±24 mA (min.) at VCC = 4.5 V - drives 50 Ω transmission lines directly per AC spec note |
| Input Noise Immunity | VNIH/VNIL ≥ 28 % VCC (min.) - rejects >1.4 V noise on 5 V buses, improving robustness in noisy industrial environments |
| Quiescent Current | 8.0 µA (max.) at Ta = 25 °C - supports low-power standby modes in battery-backed systems |
| Operating Temperature | −40 °C to +85 °C - qualified for extended industrial ambient conditions |
Pinout & Package
SOP20 (Small Outline Package, 20-pin, 0.65 mm pitch, 12.8 mm × 7.6 mm body, 0.22 g typical weight) - surface-mount compatible with standard reflow profiles and IPC-7351B footprint MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G (Pin 1) | Active-low Output Enable | Drives all A/B bus outputs to high-impedance when HIGH; must be LOW for functional data transfer |
| DIR (Pin 2) | Data Direction Control | LOW = A→B (inverted); HIGH = B→A (inverted); defines bus ownership dynamically |
| A0–A7 (Pins 3–10) | Port A Bus I/O | 8-bit bidirectional inverting I/O port - connects to local system bus; requires external termination when floating |
| B0–B7 (Pins 12–19) | Port B Bus I/O | 8-bit bidirectional inverting I/O port - connects to remote system bus; electrically isolated from A-port when G = HIGH |
| VCC (Pin 20) | Positive Supply | Single 2.0–5.5 V rail powers internal logic and output drivers; decoupling capacitor required near pin |
| GND (Pin 11) | Ground Reference | Common return path for all signals and supply current; must be low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Inverting Transceiver Logic | Ensures signal polarity inversion on both A→B and B→A paths - simplifies differential bus designs requiring complementary signaling |
| Pin- and Function-Compatible with 74F640 | Enables drop-in replacement in legacy TTL-based systems without PCB redesign or firmware changes |
| Balanced tPLH/tPHL Delays | ≤0.5 ns skew between rising/falling edge propagation - preserves duty cycle integrity in clock-forwarding or strobe-synchronized interfaces |
| Wide-Voltage 3-State Isolation | Maintains <0.44 µA OFF-state leakage across full 2.0–5.5 V range - prevents unintended bus loading during power sequencing |
| ESD-Protected Inputs | Withstands ≥20 mA input diode current per IEC 61000-4-2 Level 3 - reduces need for external TVS on board-level bus connectors |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Connecting microcontroller subsystems to FPGA-based I/O expansion modules across a 200 mm PCB backplane. IC Role / Device Role / Timing Role: Bidirectional inverting bus transceiver isolating 3.3 V MCU domain from 5 V peripheral bus while maintaining signal integrity. Use Value: Enables direct 50 Ω line driving without external buffers and eliminates level-shifter components due to 2.0–5.5 V operation. | Use Scenario: Upgrading aging 74F640-based instrumentation racks with CMOS-compatible parts while retaining existing firmware and layout. IC Role / Device Role / Timing Role: Pin-identical replacement transceiver providing identical inverting logic and timing behavior under same VCC and load conditions. Use Value: Reduces system ICC by >99% versus original bipolar part while preserving full functional and timing equivalence. |
| Automated Test Equipment (ATE) Channel Isolation | Digital Signal Acquisition Subsystem |
Use Scenario: Isolating DUT (Device Under Test) digital I/O channels from controller FPGA during calibration sequences to prevent back-driving. IC Role / Device Role / Timing Role: High-speed 3-state gate controlled by FPGA GPIO to enable/disable bi-directional test bus access on demand. Use Value: Guarantees <7.0 ns enable/disable timing (tPZL/tPZH) ensuring sub-10 ns channel switching windows for synchronized sampling. | Use Scenario: Interfacing 8-bit parallel ADC outputs to a microcontroller's external memory bus in real-time waveform capture systems. IC Role / Device Role / Timing Role: Inverting transceiver buffering ADC data lines while allowing shared bus access with other peripherals via DIR/G control. Use Value: Supports 200+ kSPS sustained throughput using 4.8 ns propagation delay and 24 mA drive to overcome trace capacitance up to 50 pF. |
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 |
|---|---|---|---|
| 74AC640SCX (ON Semiconductor) | Same logic function and SOP20 package; tPD = 5.5 ns (typ.) at 5 V; ICC = 4 µA (max.) at 25 °C | Marginally slower propagation but lower quiescent current; identical pinout and truth table | Preferred where ultra-low standby power is prioritized over maximum speed |
| SN74ACT640N (Texas Instruments) | ACT-family variant; VCC = 4.5–5.5 V only; IOH/IOL = ±24 mA; tPD = 5.2 ns (typ.) at 5 V | Narrower supply range excludes 3.3 V direct operation; higher drive strength at 5 V with tighter VOH/VOL specs | Chosen when interfacing exclusively with 5 V TTL/CMOS loads and tighter output voltage margins are required |
Compared with 74AC640SCX and SN74ACT640N, the TC74AC640FTEL uniquely supports full 2.0–5.5 V operation with 4.8 ns speed and 8 µA max ICC - making it optimal for mixed-voltage industrial systems needing both flexibility and performance.
Availability
TC74AC640FTEL is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and automated test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for TC74AC640FTEL 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
Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with decades of experience in high-reliability industrial components.
The TC74AC series targets high-speed, low-power CMOS replacements for legacy TTL bus interfaces - emphasizing pin compatibility, wide supply tolerance, and robust ESD protection for factory automation and test equipment.
FAQ
What is the logic function of the TC74AC640FTEL?
The TC74AC640FTEL is an octal 3-state inverting bus transceiver. When DIR = LOW and G = LOW, data flows from Port A to Port B with inversion; when DIR = HIGH and G = LOW, data flows from Port B to Port A with inversion; when G = HIGH, all outputs enter high-impedance state. This function is confirmed in the truth table and functional description of the official Toshiba datasheet Rev.1.0.A.
Does the TC74AC640FTEL support 3.3 V operation?
Yes, the TC74AC640FTEL supports 3.3 V operation fully - its specified operating voltage range is 2.0 V to 5.5 V, and AC characteristics including tPLH/tPHL = 6.4 ns (typ.) and tPZL/tPZH = 5.9 ns (typ.) are explicitly tested at VCC = 3.3 ± 0.3 V per Section 11.3 of the Toshiba datasheet Rev.1.0.A.
What package type is used for the TC74AC640FTEL?
The TC74AC640FTEL uses the SOP20 package - a 20-pin small outline plastic package with 0.65 mm lead pitch, 12.8 mm × 7.6 mm body size, and 0.22 g typical weight, as documented in the "Package Dimensions" section (Page 7) of the Toshiba TC74AC245F/TC74AC640F datasheet Rev.1.0.A.
Is the TC74AC640FTEL pin-compatible with the 74F640?
Yes, the TC74AC640FTEL is pin- and function-compatible with the 74F640, as explicitly stated in Section 3 "Features" of the Toshiba datasheet Rev.1.0.A: "Pin and function compatible with 74F245/640." This includes identical pin assignments, electrical interface behavior, and truth table functionality.
What is the maximum output drive capability of the TC74AC640FTEL?
The TC74AC640FTEL provides minimum output drive of |IOH|/IOL = 24 mA at VCC = 4.5 V, as specified in Section 3 "Features" and verified in DC Characteristics Table 11.1 (IOH = –24 mA, IOL = 24 mA test conditions). This allows direct driving of 50 Ω transmission lines per Note 1 in Section 11.3.
TC74AC640FTEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74AC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Logic Type:
- Transceiver, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
TC74AC640FTEL FAQ
1.How can I place an order for TC74AC640FTEL through Aetrix?
Please submit a Request for Quotation (RFQ) for TC74AC640FTEL 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 TC74AC640FTEL reliable?
The price and inventory of TC74AC640FTEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74AC640FTEL is usually 5 days.
3.What payment methods are accepted for TC74AC640FTEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74AC640FTEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC74AC640FTEL?
TC74AC640FTEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC74AC640FTEL 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 TC74AC640FTEL?
For technical support, including TC74AC640FTEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74AC640FTEL requirements.
6.How does Aetrix verify that TC74AC640FTEL is sourced from the original manufacturer or authorized distributors?
All TC74AC640FTEL 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 TC74AC640FTEL meets industry standards.
7.What is the process for return or replacement of TC74AC640FTEL?
All TC74AC640FTEL units undergo pre-shipment inspection (PSI). If there is an issue with TC74AC640FTEL, 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 TC74AC640FTEL part is unused and in its original packaging.
Return procedure for TC74AC640FTEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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