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onsemi 74VHCT244AMX
- Part No.:
- 74VHCT244AMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74VHCT244AMX.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,905
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Product details
Overview
74VHCT244AMX from ON Semiconductor is an octal non-inverting 3-STATE buffer/line driver with two active-low output enables (OE1, OE2), designed for memory address driving, clock distribution, and bus-oriented data transmission in 5V TTL-compatible systems. It operates from 4.5V to 5.5V, delivers 8mA output drive, achieves 5.9ns typical propagation delay at 5V, and supports 3V–5V mixed-voltage interfacing.
For engineers reviewing the 74VHCT244AMX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL/tPLZ ≤ 13.5ns), input/output voltage tolerance up to 7V, low ICC of 4µA max at 25°C, and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The 74VHCT244AMX implements silicon-gate CMOS technology to deliver TTL-compatible speed (tPD = 5.9ns typ.) while maintaining CMOS-level static power consumption. Its dual active-low output enables allow independent control of two groups of four outputs (O0–O3 and O4–O7), enabling selective bus isolation without external logic.
Input and output protection circuits permit safe operation across 0V–7V regardless of VCC, supporting robust level-shifting between 3V and 5V domains. The device meets JEDEC JESD78 Class II latch-up immunity and includes power-down protection on all I/O pins when VCC = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures compatibility with standard 5V TTL logic rails and margin for ripple/noise |
| Propagation Delay | 5.9ns (typ.) at VCC = 5V, CL = 50pF - enables high-speed bus buffering up to ~170MHz system clock edges |
| Output Drive | ±8mA - sufficient to drive 50pF loads with <10ns edge rates and interface directly with 74HCT/74LS inputs |
| Quiescent ICC | 4µA (max) at TA = 25°C - supports low-power standby modes in battery-backed or energy-sensitive systems |
| Input Voltage Range | –0.5V to +7.0V - allows safe connection to unpowered or overvoltage sources during hot-swap or mixed-supply sequencing |
| 3-STATE Enable Time | 8.2ns (typ.) - minimizes bus contention window during output activation in shared-data-path applications |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
Pinout & Package
74VHCT244AMX is supplied in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (Package Code M20B), with 1.27mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enable inputs controlling outputs O0–O3 (OE1) and O4–O7 (OE2) independently |
| 2–9 | I0–I7 | Non-inverting data inputs accepting TTL/CMOS logic levels; internally protected to ±20mA diode current |
| 11–18 | O0–O7 | 3-STATE buffered outputs with 8mA sink/source capability and 9pF typical output capacitance |
| 10 | GND | Digital ground reference for all I/O and internal logic; must be low-impedance for noise immunity |
| 20 | VCC | Positive supply rail (4.5–5.5V); decoupling capacitor required within 10mm for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS architecture | Delivers 5.9ns typical tPD at 5V - matches bipolar TTL performance while cutting static power by >95% vs. 74LS244 |
| Dual independent 3-STATE enables | OE1/OE2 allow split-bus control - e.g., isolate address and data lanes simultaneously without extra gating logic |
| Wide input/output voltage tolerance | –0.5V to +7.0V I/O rating - eliminates need for external clamping diodes when interfacing with 3V microcontrollers or legacy 5V peripherals |
| Low ICC and IOFF | 4µA max quiescent current and 5µA max output leakage in OFF-state - critical for power-gated subsystems and battery backup retention |
| JEDEC-compliant SOIC packaging | M20B footprint - ensures drop-in replacement for 74HCT244AM and full compatibility with automated SMT assembly lines |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/Flash devices in a tightly timed memory subsystem. IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer isolating CPU address outputs during DMA cycles; OE1/OE2 synchronized to bus grant signals. Use Value: 5.9ns tPD ensures setup/hold timing margins are preserved across 10cm PCB traces; ±8mA drive sustains signal integrity into 10+ load capacitance. | Use Scenario: Distributing a 25MHz system clock to FPGA configuration logic, ADC sampling engine, and UART baud-rate generator. IC Role / Device Role / Timing Role: Low-skew clock fanout buffer with independent enables to gate clock domains during sleep mode. Use Value: Output-to-output skew <1.0ns prevents clock domain misalignment; 9pF COUT minimizes jitter accumulation across parallel paths. |
| Industrial Bus Transceiver | Mixed-Voltage System Interface |
Use Scenario: Bidirectional data transfer between 5V PLC controller and 3.3V sensor node via RS-485 PHY with local bus arbitration. IC Role / Device Role / Timing Role: Direction-controlled line driver/receiver buffer with OE1/OE2 managing transmit/receive direction and bus release timing. Use Value: 7V-tolerant I/O permits direct connection to RS-485 transceiver outputs without level shifters; 13.5ns max disable time limits bus turnaround latency. | Use Scenario: Interfacing a 3.3V ARM Cortex-M4 MCU GPIO bank to legacy 5V peripheral (e.g., LCD controller or EEPROM) in a medical diagnostic instrument. IC Role / Device Role / Timing Role: Unidirectional level translator and drive booster, converting 3.3V logic highs to 5V-compatible outputs while tolerating 5V inputs safely. Use Value: VIH = 2.0V min guarantees reliable recognition of 3.3V logic highs; 7V input rating prevents damage during power sequencing mismatches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-STATE buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT244PW,118 (Nexperia) | TSSOP-20 package; identical AC/DC specs but 10pF higher CIN (14pF vs. 4pF) | Better board space efficiency; slightly higher capacitive loading on driving source | Select for compact layouts where thermal dissipation is not limiting and PCB real estate is constrained |
| SN74HCT244N (Texas Instruments) | DIP-20 through-hole package; same SOIC pinout but incompatible mounting; 6.5ns tPD (typ.) | Prototyping and legacy repair only; no SMT compatibility with 74VHCT244AMX footprint | Select only for hand-soldered evaluation or field replacement where SOIC rework is impractical |
Compared with 74HCT244PW,118 and SN74HCT244N, the 74VHCT244AMX offers optimal balance of high-speed performance (5.9ns), ultra-low ICC (4µA), and industry-standard SOIC-20 manufacturability - making it preferred for volume production of industrial controllers and communication modules requiring long-term supply stability.
Availability
74VHCT244AMX is available at Aetrix Electronics and suitable for industrial automation, embedded communications, and test equipment requiring stable component supply, extended temperature operation, and JEDEC-compliant SOIC packaging.
Supply support for 74VHCT244AMX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and logic solutions for automotive, industrial, cloud computing, and consumer markets.
The 74VHCT244AMX belongs to ON Semiconductor's legacy VHCT logic family, engineered for high-speed, low-power 5V TTL-compatible interfacing in cost-sensitive industrial and communications infrastructure.
FAQ
What is the maximum operating frequency supported by the 74VHCT244AMX?
The 74VHCT244AMX does not specify a maximum clock frequency in its datasheet, as it is a combinational buffer-not a clocked device. However, its 5.9ns typical propagation delay at 5V and 50pF load supports clean signal transmission up to ~170MHz edge rates. System-level timing must account for PCB trace delays, load capacitance, and driver strength; actual usable frequency depends on layout and termination.
Does the 74VHCT244AMX support mixed-voltage operation between 3.3V and 5V systems?
Yes, the 74VHCT244AMX supports mixed-voltage interfacing: its inputs accept 3.3V logic levels (VIH = 2.0V min), and its 7V-tolerant I/O structure allows safe connection to 5V buses even when VCC = 3.3V is not applied. This enables direct 3.3V MCU-to-5V peripheral interfacing without external level shifters-provided VCC is stabilized at 4.5–5.5V during operation.
What is the function of pins 1 and 19 on the 74VHCT244AMX?
Pins 1 and 19 are OE1 and OE2-the active-low 3-STATE output enable inputs. When OE1 is LOW, outputs O0–O3 enter high-impedance state; when HIGH, they follow inputs I0–I3. OE2 controls O4–O7 identically. Both enables must be HIGH for full 8-bit output drive. This dual-enable architecture enables independent control of two 4-bit data lanes, reducing external logic in segmented bus designs.
Can the 74VHCT244AMX be used in battery-powered applications?
Yes, the 74VHCT244AMX is well-suited for battery-powered applications due to its 4µA maximum quiescent supply current at 25°C and 5µA max output leakage in 3-STATE mode. Its ability to operate down to 4.5V ensures functionality across most Li-ion/Li-Po discharge curves. For ultra-low-power sleep modes, tie OE1/OE2 HIGH to disable all outputs and minimize system standby current.
Is the 74VHCT244AMX pin-compatible with the 74HCT244 series?
Yes, the 74VHCT244AMX is pin- and function-compatible with the 74HCT244 family, including 74HCT244N and 74HCT244M. It shares identical pinout, logic behavior, DC/AC specifications, and SOIC-20 (M20B) package dimensions. The "V" prefix denotes enhanced speed and lower ICC, but no PCB layout changes are required when upgrading from standard 74HCT244 variants.
74VHCT244AMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74VHCT244AMX FAQ
1.How can I place an order for 74VHCT244AMX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT244AMX 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 74VHCT244AMX reliable?
The price and inventory of 74VHCT244AMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT244AMX is usually 5 days.
3.What payment methods are accepted for 74VHCT244AMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT244AMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT244AMX?
74VHCT244AMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT244AMX 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 74VHCT244AMX?
For technical support, including 74VHCT244AMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT244AMX requirements.
6.How does Aetrix verify that 74VHCT244AMX is sourced from the original manufacturer or authorized distributors?
All 74VHCT244AMX 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 74VHCT244AMX meets industry standards.
7.What is the process for return or replacement of 74VHCT244AMX?
All 74VHCT244AMX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT244AMX, 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 74VHCT244AMX part is unused and in its original packaging.
Return procedure for 74VHCT244AMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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