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Toshiba Semiconductor and Storage TC74HC244AF(EL,F)
- Part No.:
- TC74HC244AF(EL,F)
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
TC74HC244AF(EL,F).pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,015
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Product details
Overview
TC74HC244AF(EL,F) from Toshiba is a non-inverting octal bus buffer with 3-state outputs and dual active-low output enables, designed for bidirectional data bus interfacing in memory address driver and system bus applications. It operates from 2 V to 6 V, delivers 6 mA output drive per channel, supports 15 LSTTL loads, and achieves 10 ns typical propagation delay at 5 V.
For engineers reviewing the TC74HC244AF(EL,F) datasheet, TC74HC244AF(EL,F) pinout, TC74HC244AF(EL,F) application, or TC74HC244AF(EL,F) equivalent, key selection criteria include dual active-low enable logic, symmetrical output impedance, wide supply range, high noise immunity (28% VCC), and compatibility with 74LS244-level timing and loading.
Technical Context
The TC74HC244AF(EL,F) implements silicon gate C2MOS technology to deliver LSTTL-speed performance with CMOS power efficiency. Its two independent 4-bit sections each feature separate active-low output enable inputs (1OE, 2OE), enabling selective bus gating without inversion.
All inputs include ESD protection circuits; outputs exhibit balanced tpLH/tpHL delays and support high-impedance tri-state operation during disable. The device maintains stable DC characteristics across −40°C to +85°C and supports input rise/fall times up to 400 ns at 6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - Enables interoperability with mixed-voltage 3.3 V and 5 V logic systems. |
| tpd (typ) | 10 ns at VCC = 5 V - Matches LSTTL speed for legacy bus timing integration. |
| IOL / IOH (min) | 6 mA - Drives 15 LSTTL loads directly without external buffers. |
| VIH / VIL (min/max) | 4.20 V / 1.80 V at VCC = 6 V - Ensures robust noise margin of ≥28% VCC. |
| IOZ (max) | ±5.0 μA at Ta = −40 to 85°C - Guarantees low leakage in high-impedance state across full temp range. |
| ICC (max) | 40.0 μA at VCC = 6 V - Supports ultra-low static power in battery-backed or standby modes. |
| CIN / COUT | 5 pF / 10 pF - Minimizes capacitive loading on driving and receiving nodes. |
Pinout & Package
SOP20-P-300-1.27A surface-mount package (20-pin, 1.27 mm pitch, 7.6 × 12.8 mm body).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Output Enable (1OE, 2OE) | Active-low controls enable/disable of respective 4-bit buffer sections; tied low for always-on operation. |
| 2–5, 14–17 | Data Inputs (1A1–1A4, 2A1–2A4) | Non-inverting inputs accepting TTL- or CMOS-level signals; internally protected against ±20 mA transient current. |
| 6–9, 12–15 | Data Outputs (1Y1–1Y4, 2Y1–2Y4) | 3-state buffered outputs; high-impedance when corresponding OE is high; |IOH| = IOL ≥ 6 mA. |
| 10 | GND | Ground reference for all logic and power domains; must be low-inductance connection. |
| 20 | VCC | Positive supply rail; decoupling capacitor (0.1 μF) required within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit sections | Enables selective control of two bus segments using separate 1OE/2OE pins - avoids global bus contention. |
| Symmetrical output drive | |IOH| = IOL ≥ 6 mA ensures matched rise/fall times and consistent signal integrity on shared lines. |
| High noise immunity | VNIH/VNIL ≥ 28% VCC minimizes false triggering in electrically noisy industrial environments. |
| Pin-compatible with 74LS244 | Direct drop-in replacement in existing LSTTL designs without PCB or firmware changes. |
| Wide temperature range | −40°C to +85°C operation supports deployment in automotive under-hood and industrial control cabinets. |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Driving 16-bit address lines from an 8-bit microcontroller to external SRAM or EPROM. IC Role / Device Role / Timing Role: Non-inverting octal buffer with 3-state control isolates MCU address bus during DMA cycles. Use Value: Dual OE pins allow interleaved access to two memory banks while maintaining timing compliance per JEDEC 74AC/HC standards. | Use Scenario: Extending GPIO count via parallel I/O expansion using 8-bit latched peripherals. IC Role / Device Role / Timing Role: Bidirectional bus interface with tri-state control synchronized to microcontroller write strobes. Use Value: 10 ns tpd and 6 mA drive ensure setup/hold timing margins are met even at 10 MHz bus clock rates. |
| Industrial PLC Backplane Interface | Legacy ISA Bus Signal Conditioning |
Use Scenario: Level-shifting and fan-out buffering between 5 V CPU module and 3.3 V I/O modules on modular rack backplane. IC Role / Device Role / Timing Role: Voltage-tolerant buffer (2–6 V VCC) translating logic levels while providing ESD-hardened signal paths. Use Value: Input protection circuits withstand ±20 mA transients common in factory-floor EMI environments. | Use Scenario: Replacing obsolete 74LS244 in retro-computing hardware restoration projects. IC Role / Device Role / Timing Role: Pin- and function-identical upgrade delivering lower ICC and higher noise immunity. Use Value: 4 μA max ICC at 25°C reduces board-level heat generation and extends vintage system reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244N | Same logic function and pinout; slightly higher ICC (80 μA max) and lower noise margin (20% VCC). | Optimized for TI's standard SOIC packaging; lacks Toshiba's C2MOS process benefits in propagation delay consistency. | Preferred where TI supply chain alignment is required; verify thermal derating above 65°C due to higher PD. |
| 74VHC244M | Higher speed (tpd = 7.5 ns typ), but narrower VCC range (2–5.5 V); IOZ = ±10 μA (vs. ±5 μA for TC74HC244AF). | Better suited for high-frequency clock distribution; less tolerant of 6 V rail excursions in industrial brownout conditions. | Select when sub-8 ns timing is critical and supply regulation is tight; avoid in 6 V nominal systems. |
Compared with SN74HC244N and 74VHC244M, the TC74HC244AF(EL,F) offers superior noise immunity, tighter ICC control, and guaranteed 6 V operation - making it optimal for ruggedized embedded systems where voltage margin and long-term reliability outweigh marginal speed gains.
Availability
TC74HC244AF(EL,F) is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus expansion, and industrial PLC backplane interfacing requiring stable component supply and long-lifecycle support.
Supply support for TC74HC244AF(EL,F) 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 designs and manufactures high-reliability semiconductor solutions for industrial, automotive, and consumer applications, with over 50 years of analog and digital IC heritage.
The TC74HC244AF(EL,F) belongs to Toshiba's HC-series CMOS logic family, engineered specifically for drop-in replacement of bipolar TTL in cost-sensitive, power-constrained, and thermally demanding embedded systems.
FAQ
What is the maximum operating temperature range for the TC74HC244AF(EL,F)?
The TC74HC244AF(EL,F) is rated for continuous operation from −40°C to +85°C. This range is validated per Toshiba's operating specifications and applies to all DC and AC parameters including VOH, VOL, tpd, and IOZ. Operation outside this range may result in parametric degradation or functional failure. Thermal design must ensure junction temperature remains within limits under worst-case power dissipation.
Does the TC74HC244AF(EL,F) support 3.3 V logic systems?
Yes, the TC74HC244AF(EL,F) supports 3.3 V operation with full parameter compliance: VIH(min) = 2.0 V and VIL(max) = 1.35 V at VCC = 4.5 V, and its 2–6 V supply range includes 3.3 V nominal rails. It interfaces reliably with 3.3 V microcontrollers and FPGAs without level shifters, provided output loads remain within 6 mA per pin.
How does the dual output enable architecture of the TC74HC244AF(EL,F) improve system design?
The TC74HC244AF(EL,F) features two independent active-low output enables (1OE and 2OE), allowing separate control of its two 4-bit sections. This enables time-multiplexed bus sharing, eliminates contention during partial writes, and simplifies arbitration logic in multi-master systems - a capability not available in single-enable alternatives like the 74HC240A.
Is the TC74HC244AF(EL,F) pin-compatible with the 74LS244?
Yes, the TC74HC244AF(EL,F) is pin- and function-compatible with the 74LS244, including identical pin assignment, truth table behavior, and dual active-low enable logic. This allows direct replacement in legacy designs without PCB modification, while delivering lower power, higher noise immunity, and wider voltage range than the bipolar LS version.
What is the output leakage current specification for the TC74HC244AF(EL,F) in 3-state mode?
In 3-state (high-impedance) mode, the TC74HC244AF(EL,F) specifies an off-state output current (IOZ) of ±5.0 μA maximum across −40°C to +85°C at VCC = 6.0 V. This low leakage ensures minimal bus loading during disable, preserving signal integrity on shared data or address lines in large-scale bus architectures.
TC74HC244AF(EL,F) Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
TC74HC244AF(EL,F) FAQ
1.How can I place an order for TC74HC244AF(EL,F) through Aetrix?
Please submit a Request for Quotation (RFQ) for TC74HC244AF(EL,F) 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 TC74HC244AF(EL,F) reliable?
The price and inventory of TC74HC244AF(EL,F) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74HC244AF(EL,F) is usually 5 days.
3.What payment methods are accepted for TC74HC244AF(EL,F)?
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4.How is shipping managed for TC74HC244AF(EL,F)?
TC74HC244AF(EL,F) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC74HC244AF(EL,F) 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 TC74HC244AF(EL,F)?
For technical support, including TC74HC244AF(EL,F) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74HC244AF(EL,F) requirements.
6.How does Aetrix verify that TC74HC244AF(EL,F) is sourced from the original manufacturer or authorized distributors?
All TC74HC244AF(EL,F) 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 TC74HC244AF(EL,F) meets industry standards.
7.What is the process for return or replacement of TC74HC244AF(EL,F)?
All TC74HC244AF(EL,F) units undergo pre-shipment inspection (PSI). If there is an issue with TC74HC244AF(EL,F), 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 TC74HC244AF(EL,F) part is unused and in its original packaging.
Return procedure for TC74HC244AF(EL,F):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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