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onsemi MC74VHC244DWR2G
- Part No.:
- MC74VHC244DWR2G
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74VHC244DWR2G.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,679
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Product details
Overview
MC74VHC244DWR2G from onsemi is an advanced high-speed CMOS octal noninverting 3-state bus buffer with dual active-low output enables (OEA, OEB), designed for memory address/data bus driving in 2.0–5.5 V systems. It features 3.8 ns typical propagation delay at 5.0 V, ±25 mA output drive, and 5.5 V tolerant inputs enabling 3 V/5 V level translation.
For engineers reviewing the MC74VHC244DWR2G datasheet, pinout, applications, or equivalent options, key selection criteria include 3-state timing (tPZL/tPLZ), input voltage tolerance (−0.5 to +6.5 V), noise immunity (VNIH/VNIL = 28%), SOIC-20 package compatibility, and TTL-compatible alternatives for mixed-voltage interfacing.
Technical Context
The MC74VHC244DWR2G implements a three-stage silicon-gate CMOS architecture with buffered outputs to ensure high noise immunity and stable switching. Its dual independent enable structure allows selective control of two 4-bit groups (YA1–YA4 and YB1–YB4), supporting bidirectional bus isolation in memory and peripheral interfaces.
Input pins tolerate up to 5.5 V regardless of VCC, enabling safe interfacing between 3.3 V logic and 5.0 V buses. The device operates across −55°C to +125°C and supports 15 pF and 50 pF load conditions per AC characterization table, with guaranteed skew ≤1.5 ns between outputs under matched loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal noninverting 3-state buffer with dual active-low enables (OEA/OEB) |
| VCC Range | 2.0 V to 5.5 V - supports wide supply flexibility including 3.3 V and 5.0 V operation |
| tPD (Typ) | 3.8 ns at VCC = 5.0 V, CL = 15 pF - enables high-speed bus buffering in memory subsystems |
| IOL/IOH | ±25 mA per output - drives standard CMOS loads and moderate PCB trace capacitance |
| Input Voltage Range | −0.5 V to +6.5 V - permits 5 V-tolerant inputs for mixed-voltage system interfacing |
| ESD Rating | HBM > 2000 V - provides robust handling during board assembly and handling |
| Operating Temp | −55°C to +125°C - qualified for industrial and extended-temperature applications |
Pinout & Package
MC74VHC244DWR2G is housed in a 20-pin SOIC-20 wide-body (Case 751D) package with 1.27 mm pitch, 12.8 mm × 7.5 mm footprint, and gull-wing leads. Pin 1 is marked by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low output enables - independently control YA and YB groups; low = enabled, high = high-impedance |
| 2–5, 17–20 | A1–A4, B1–B4 | Data inputs - A-group and B-group inputs routed to respective output banks |
| 6–9, 11–14 | YA1–YA4, YB1–YB4 | Noninverting buffered outputs - each mirrors its corresponding input when enabled |
| 10 | GND | Ground reference - common return for all signals and power |
| 15 | VCC | Positive supply - powers internal logic and output drivers; must be decoupled locally |
Key Features
| Feature | Design Value |
|---|---|
| High-speed propagation | 3.8 ns typical tPD at 5.0 V enables sub-10 ns bus cycle times in memory controllers |
| 5.5 V input tolerance | Allows direct connection to 5 V buses while powered from 3.3 V - eliminates external level shifters |
| Power-down protection | Outputs remain high-impedance and non-destructive even when VCC = 0 V - safe for hot-swap and battery-backup systems |
| Low dynamic noise | VOLP ≤ 0.9 V ensures <1 V ground bounce during simultaneous switching - critical for signal integrity |
| Pb-free & RoHS | Meets environmental compliance requirements without compromising electrical performance or thermal reliability |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices sharing a common data/address bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU address outputs; enables/disables segments via OEA/OEB for bank selection. Use Value: Prevents bus contention during multi-device access; 3.8 ns tPD maintains timing margins in 25+ MHz address strobes. | Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to interface with parallel LCD, keypad, or legacy peripherals. IC Role / Device Role / Timing Role: Bidirectional bus driver translating between 3.3 V MCU I/O and 5 V peripheral logic levels. Use Value: 5.5 V-tolerant inputs accept 5 V signals directly; dual enables allow time-multiplexed peripheral control. |
| Industrial PLC I/O Module | Automotive Body Control Unit |
Use Scenario: Isolating digital I/O signals between FPGA-based logic and relay/driver ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting buffer with ESD-hardened inputs protecting against field-induced transients. Use Value: HBM >2000 V rating withstands industrial ESD events; −55°C to +125°C range supports unheated cabinet operation. | Use Scenario: Interfacing infotainment SoC address/data buses to legacy CAN/LIN transceivers and EEPROMs in dashboard modules. IC Role / Device Role / Timing Role: Voltage-tolerant bus repeater enabling mixed 3.3 V/5.0 V subsystem communication. Use Value: Input tolerance eliminates level-shifter components; SOIC-20 WB package meets automotive vibration and thermal cycling requirements. |
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 |
|---|---|---|---|
| MC74VHCT244ADWR2G | TTL-compatible inputs (VIH = 2.0 V min), same SOIC-20 package and pinout | Required where driving from legacy 5 V TTL sources; not suitable for pure CMOS 3.3 V inputs | Select when interfacing 5 V TTL logic; retains identical layout but requires 4.5–5.5 V supply |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), 3.3 V only; 3.5 ns tPD at 3.3 V; TSSOP-20 package | Better suited for low-voltage portable designs; incompatible with 5 V buses due to 3.6 V max VCC | Choose for 3.3 V-only systems needing faster speed and smaller footprint; requires PCB redesign |
Compared with MC74VHC244DWR2G, MC74VHCT244ADWR2G offers TTL input compatibility at the cost of reduced supply flexibility, while SN74LVC244APWR delivers lower-voltage optimization and higher speed but sacrifices 5 V interoperability and requires package change.
Availability
MC74VHC244DWR2G is available at Aetrix Electronics and suitable for memory subsystem design, industrial bus expansion, and automotive body electronics requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for MC74VHC244DWR2G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74VHC244DWR2G belongs to the VHC logic family - engineered for high-speed, low-power, 3.3 V/5 V mixed-signal interfacing with robust noise immunity and wide temperature operation.
FAQ
What is the maximum operating voltage for MC74VHC244DWR2G inputs?
The MC74VHC244DWR2G inputs tolerate voltages from −0.5 V to +6.5 V, independent of VCC. This allows safe interfacing with 5 V signals even when powered from 3.3 V, eliminating need for external level shifters in mixed-voltage designs. This specification is confirmed in the Maximum Ratings table of the official onsemi datasheet.
Does MC74VHC244DWR2G support hot insertion?
Yes, MC74VHC244DWR2G supports hot insertion due to its power-down protection feature: outputs remain in high-impedance state and are non-destructive even when VCC = 0 V. This prevents back-driving and latch-up during live board insertion, as verified in the datasheet's "Output Structures" section and Maximum Ratings table.
What is the typical propagation delay of MC74VHC244DWR2G at 3.3 V?
At VCC = 3.3 V and CL = 15 pF, the typical propagation delay (tPLH/tPHL) of MC74VHC244DWR2G is 5.8 ns, as specified in the AC Electrical Characteristics table. This value reflects real-world performance under standard test conditions and enables reliable timing in 3.3 V memory and peripheral interfaces.
Can MC74VHC244DWR2G replace MC74VHCT244ADWR2G in a design?
MC74VHC244DWR2G cannot directly replace MC74VHCT244ADWR2G in TTL-driven systems because its CMOS-input threshold (VIH = 70% VCC) differs from the VHCT's TTL-compatible threshold (VIH = 2.0 V min). Substitution is only valid if all driving sources meet CMOS-level specifications and VCC remains within 2.0–5.5 V.
What package type is used for MC74VHC244DWR2G?
MC74VHC244DWR2G uses the SOIC-20 Wide Body (Case 751D) package - a 20-pin surface-mount outline measuring 12.8 mm × 7.5 mm with 1.27 mm lead pitch. This is confirmed in the Ordering Information table and Mechanical Case Outline drawing on page 10 of the onsemi datasheet.
MC74VHC244DWR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74VHC244DWR2G FAQ
1.How can I place an order for MC74VHC244DWR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHC244DWR2G 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 MC74VHC244DWR2G reliable?
The price and inventory of MC74VHC244DWR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHC244DWR2G is usually 5 days.
3.What payment methods are accepted for MC74VHC244DWR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHC244DWR2G transactions.
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4.How is shipping managed for MC74VHC244DWR2G?
MC74VHC244DWR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHC244DWR2G 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 MC74VHC244DWR2G?
For technical support, including MC74VHC244DWR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHC244DWR2G requirements.
6.How does Aetrix verify that MC74VHC244DWR2G is sourced from the original manufacturer or authorized distributors?
All MC74VHC244DWR2G 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 MC74VHC244DWR2G meets industry standards.
7.What is the process for return or replacement of MC74VHC244DWR2G?
All MC74VHC244DWR2G units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHC244DWR2G, 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 MC74VHC244DWR2G part is unused and in its original packaging.
Return procedure for MC74VHC244DWR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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