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onsemi 74VHCT244AN
- Part No.:
- 74VHCT244AN
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74VHCT244AN.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,735
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Product details
Overview
74VHCT244AN from ON Semiconductor is an octal non-inverting 3-STATE buffer/line driver with two active-low output enables, designed for memory address driving, clock distribution, and bus-oriented data transmission in 5V systems. It delivers 5.9ns typical propagation delay at 5V, supports 4.5V–5.5V supply operation, and features ±25mA output drive capability with 4µA max quiescent current.
For engineers reviewing the 74VHCT244AN datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL/tPLZ ≤ 13.5ns), input/output voltage tolerance up to 7V, and compatibility with 74HCT244 logic families in mixed-voltage interfacing scenarios.
Technical Context
The 74VHCT244AN implements dual independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (OE1, OE2). Its silicon gate CMOS process enables TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V) while maintaining CMOS-level power efficiency.
All inputs and outputs are protected against overvoltage up to 7V regardless of VCC state - enabling safe interfacing between 5V and 3V domains or battery-backed dual-supply systems. Outputs enter high-impedance (Z) state when either OE is HIGH, with IOZ ≤ ±2.5µA at 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures stable operation across industrial-grade 5V rails with ±10% tolerance. |
| Propagation Delay | 5.9ns typical (CL = 50pF, VCC = 5V) - enables reliable timing in high-speed address/data buses up to ~100MHz. |
| Output Drive | ±8mA at VOL ≤ 0.44V / VOH ≥ 3.80V - sufficient to drive standard TTL loads or multiple CMOS inputs without buffering. |
| 3-STATE Enable/Disable | tPZL ≤ 13.5ns, tPLZ ≤ 13.0ns (CL = 50pF) - minimizes bus contention windows during direction switching. |
| Input/Output Voltage Range | –0.5V to +7.0V - allows hot-swap and level-shifting use without external clamping diodes. |
| Quiescent Current | 4µA max at TA = 25°C - supports low-power standby modes in portable or energy-sensitive systems. |
Pinout & Package
74VHCT244AN is supplied in a 20-lead Plastic Dual In-line Package (PDIP), designated as package number N20B per Fairchild/ON Semiconductor documentation. This through-hole package measures 0.300" wide with 0.100" lead pitch and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-STATE enables - independently control first four (pins 2–9) and last four (pins 12–18) outputs. |
| 2–9 | I0–I3, O0–O3 | Input/output pairs for Channel A - non-inverting path with simultaneous 3-STATE control via OE1. |
| 11–18 | I4–I7, O4–O7 | Input/output pairs for Channel B - non-inverting path with simultaneous 3-STATE control via OE2. |
| 10 | GND | Ground reference - must be connected to system common return for proper noise immunity and DC biasing. |
| 20 | VCC | Positive supply - supplies internal logic and output drivers; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS architecture | 5.9ns typical tPD matches bipolar TTL performance while retaining CMOS power efficiency. |
| Overvoltage-tolerant I/O | Withstands –0.5V to +7.0V on inputs/outputs independent of VCC - eliminates need for external protection in mixed-supply systems. |
| Dual independent 3-STATE control | Separate OE1/OE2 pins allow selective gating of two 4-bit groups - simplifies bus arbitration and reduces control logic overhead. |
| Low ICC and IOZ | 4µA max ICC and ±2.5µA max IOZ ensure minimal leakage during sleep or isolation - critical for battery-backed applications. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or flash devices sharing a common data bus. IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer isolating address signals during bus contention or device selection. Use Value: Prevents address corruption during chip select transitions; tPLZ ≤ 13.0ns ensures clean turn-off before next cycle begins. | Use Scenario: Distributing a single system clock to multiple synchronous peripherals with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew fanout buffer providing identical edge timing to all downstream clocks. Use Value: Output-to-output skew ≤ 1.0ns maintains setup/hold margins across receivers; ±8mA drive handles capacitive loads up to 50pF. |
| 5V-to-3V Level Translation | Bus Transceiver Interface |
Use Scenario: Interfacing a 5V microcontroller GPIO port to a 3.3V sensor or communication IC without level-shifter ICs. IC Role / Device Role / Timing Role: Voltage-tolerant buffer operating at 5V VCC while accepting and driving 3V logic levels safely. Use Value: Input thresholds (VIH = 2.0V, VIL = 0.8V) guarantee correct recognition of 3V signals; 7V I/O rating prevents latch-up during power sequencing. | Use Scenario: Bidirectional data bus isolation between CPU and peripheral subsystems using separate enable controls. IC Role / Device Role / Timing Role: Unidirectional line driver enabling/disabling data flow on parallel buses under software control. Use Value: Independent OE1/OE2 permits staggered activation of upper/lower byte lanes - reducing peak current surges and EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT244N | Same pinout and function but higher ICC (max 80µA vs. 4µA) and slower tPD (14ns typ. vs. 5.9ns). | Less suitable for low-power or high-speed timing-critical paths; acceptable where static power budget allows. | Select 74HCT244N only if legacy design reuse or cost sensitivity outweighs speed/power advantages of 74VHCT244AN. |
| SN74LV244APWR | TSSOP-20 package only; lower VCC range (2.0–5.5V); VIH/VIL thresholds scaled for 3.3V logic; no 7V I/O tolerance. | Designed for 3.3V-native systems; not recommended for 5V-only or mixed-voltage hot-swap interfaces. | Choose SN74LV244APWR for new 3.3V designs requiring smaller footprint; avoid for 5V bus buffering or overvoltage resilience needs. |
Compared with 74HCT244N and SN74LV244APWR, the 74VHCT244AN uniquely combines 5V-speed performance, ultra-low quiescent current, and robust 7V I/O tolerance - making it optimal for industrial 5V bus systems requiring reliability across voltage transients and temperature extremes.
Availability
74VHCT244AN is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, 5V-to-3V level translation, and bus transceiver interface applications requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for 74VHCT244AN 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 power management, analog, sensors, and logic solutions for automotive, industrial, cloud, and consumer markets.
The 74VHCT244AN belongs to ON Semiconductor's legacy VHCT logic family, engineered for high-speed, low-power 5V TTL-compatible interfacing in industrial and computing infrastructure applications.
FAQ
What is the maximum operating temperature range for the 74VHCT244AN?
The 74VHCT244AN is rated for continuous operation from –40°C to +85°C under recommended conditions. This industrial temperature range ensures reliability in embedded controllers, motor drives, and network equipment exposed to ambient thermal stress without derating.
Does the 74VHCT244AN support 3.3V input logic levels when powered at 5V?
Yes - the 74VHCT244AN accepts 3.3V logic inputs reliably at 5V VCC because its VIH threshold is fixed at 2.0V minimum and VIL at 0.8V maximum. This allows direct connection to 3.3V microcontrollers or FPGAs without level-shifting circuitry.
Can the 74VHCT244AN outputs safely drive a 50pF load at full speed?
Yes - AC specifications confirm tPLH/tPHL = 5.9ns typical and tPZL/tPLZ ≤ 13.5ns with CL = 50pF and RL = 1kΩ. The 74VHCT244AN is characterized and guaranteed for this load condition, supporting high-fidelity signal integrity on moderately capacitive PCB traces.
Is the 74VHCT244AN pin-compatible with the 74LS244?
No - while functionally similar as octal buffers, the 74VHCT244AN uses CMOS input structure and different DC/AC characteristics. It is pin- and function-compatible with 74HCT244, not 74LS244, due to differing input current requirements and output drive strength.
What is the purpose of the two separate output enable pins (OE1 and OE2) on the 74VHCT244AN?
The dual OE pins allow independent control of two 4-bit groups: OE1 manages outputs O0–O3 (pins 12–18), and OE2 manages O4–O7 (pins 2–9). This enables partial bus gating, staggered enable sequencing, and reduced simultaneous switching noise compared to single-enable octal buffers like the 74VHCT240.
74VHCT244AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74VHCT244AN FAQ
1.How can I place an order for 74VHCT244AN through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT244AN 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 74VHCT244AN reliable?
The price and inventory of 74VHCT244AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT244AN is usually 5 days.
3.What payment methods are accepted for 74VHCT244AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT244AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT244AN?
74VHCT244AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT244AN 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 74VHCT244AN?
For technical support, including 74VHCT244AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT244AN requirements.
6.How does Aetrix verify that 74VHCT244AN is sourced from the original manufacturer or authorized distributors?
All 74VHCT244AN 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 74VHCT244AN meets industry standards.
7.What is the process for return or replacement of 74VHCT244AN?
All 74VHCT244AN units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT244AN, 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 74VHCT244AN part is unused and in its original packaging.
Return procedure for 74VHCT244AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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