74VHC244M ON Semiconductor Undefined or Miscellaneous (Other) In Stock
ON Semiconductor 74VHC244M is a VHC-family octal bus driver/buffer with active-low output enables in a 20-pin SOIC package, supporting 2.0 V to 5.5 V operation with 8 mA output drive for high-speed CMOS bus buffering applications.
- Manufacturer
- ON Semiconductor
- Package
- Other
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- 74VHC244M Datasheet PDF
- Category
- Undefined or Miscellaneous
- Price
- From $0.3300(MOQ 509)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Octal (8-bit) non-inverting bus driver with two independent active-low output enable controls
- VHC family supports 2.0 V to 5.5 V supply voltage range for mixed-voltage bus systems
- 8 mA (I_OL) output sink current per channel enables direct drive of CMOS bus loads
- 20-pin SOIC-20 (0.300 inch) surface-mount package for standard automated assembly
- RoHS-compliant JESD-609 Code e3 with lead-free finish for green electronics compliance
Applications
The 74VHC244M is used as a bus buffer and line driver in microprocessor address and data bus expansion systems, where its 8 high-current outputs capable of 8 mA sink current can drive multiple CMOS loads simultaneously without signal degradation. It is also employed in memory interface circuits, FPGA I/O expansion, and industrial PLC backplane bus drivers where the active-low output enable allows gated bus sharing between multiple masters. The VHC logic family's 2.0 V to 5.5 V supply range makes this device suitable for both 3.3 V embedded systems and legacy 5 V TTL-compatible bus architectures.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | 751BJ |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Family | AHC/VHC |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e3 |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.008A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | RAIL |
| Peak Reflow Temperature (Cel) | 260 |
| Prop. Delay@Nom-Sup | 8.5ns |
| Propagation Delay (tpd) | 13.5ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | MATTE TIN |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the 74VHC244M's dual output-enable structure allow bus multiplexing across multiple sources?
The 74VHC244M has two independent active-low output enable pins, each controlling 4 of the 8 output channels. By driving one enable high while the other is low, designers can selectively gate which half of the 8-bit bus is driven, enabling a 4-bit or 8-bit data steering function. This is useful in bus arbitration circuits, memory banking, and FPGA I/O demux applications operating at 3.3 V or 5 V supply voltages.
What output drive current does the 74VHC244M provide, and how many CMOS loads can one output drive?
Each output of the 74VHC244M can sink 8 mA (I_OL) and source proportional current, which is sufficient to directly drive 10 to 20 standard CMOS inputs presenting 3 pF to 5 pF each, assuming a 50 pF total bus capacitance. This drive strength supports moderate fan-out in address bus buffers, memory read/write data lines, and test bus expansion circuits without additional line driver stages.
Can the 74VHC244M interface between a 3.3 V FPGA and a 5 V legacy TTL bus without level-shifting hardware?
The VHC244 is specified for supply voltages from 2.0 V to 5.5 V, but when powered at 3.3 V its output high voltage (V_OH) is typically 3.3 V, which is below the 5 V TTL V_IH threshold unless the load is CMOS-compatible. In most practical cases a dedicated level-shifter such as the 74LVCH245A is preferred for true 3.3 V to 5 V translation. However, if the 5 V bus receivers are tolerant of 3.3 V highs, the 74VHC244M powered at 3.3 V can be used without additional hardware.
How does the 74VHC244M differ from the 74HC244, and when should engineers upgrade to the VHC variant?
The VHC logic family offers higher speed and lower propagation delay — typically 4 ns at 5 V versus 7 ns for HC family — and lower power consumption at high clock rates above 10 MHz. For bus buffer applications running above 20 MHz clock rates or in battery-powered systems where dynamic power at 8 outputs toggling matters, the 74VHC244M provides measurably lower switching energy per cycle in the same 20-pin SOIC-20 footprint as its HC counterpart.
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About ON Semiconductor
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 509+ | $0.5900 | $300.31 |
| 1000+ | $0.4888 | $488.80 |
| 2160+ | $0.3300 | $712.80 |
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