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onsemi MM74HC244MTCX
- Part No.:
- MM74HC244MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MM74HC244MTCX.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MM74HC244MTCX from ON Semiconductor is an octal non-inverting 3-STATE buffer with dual active-low enables (1G, 2G), operating across 2–6 V supply, delivering 6 mA output drive per channel and 14 ns typical propagation delay at 4.5 V. It is used in bidirectional bus interfacing for microcontroller peripheral expansion and memory address/data buffering.
For engineers reviewing the MM74HC244MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE bus contention control, wide VCC range compatibility, low quiescent current (80 µA), and TSSOP-20 package suitability for high-density PCB layouts.
Technical Context
The MM74HC244MTCX implements eight independent CMOS buffer channels grouped into two quad sections, each controlled by a dedicated active-low enable (1G controls Y1–Y4; 2G controls Y5–Y8). All inputs lack Schmitt-trigger hysteresis and are protected by diode clamps to VCC and GND.
It uses silicon-gate CMOS technology to achieve LS-TTL-compatible fanout (15) while maintaining high noise immunity and low static power. Propagation delay scales predictably with supply voltage and load capacitance-e.g., 10 ns max at 6.0 V/50 pF and 29 ns max at 4.5 V/150 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0–6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral) |
| Propagation Delay (tPLH/tPHL) | 14 ns typical at VCC = 4.5 V, CL = 50 pF - enables reliable operation up to ~35 MHz bus toggle rates |
| Output Drive Current | ±6 mA per output - sufficient to drive 15 LS-TTL loads or moderate PCB trace capacitance |
| Quiescent Supply Current | 80 µA max at VCC = 6.0 V - suitable for low-power standby modes in battery-backed systems |
| 3-STATE Leakage (IOZ) | ±5 µA max at VCC = 6.0 V - ensures minimal bus leakage during high-impedance state |
| Input Capacitance (CIN) | 10 pF max - limits capacitive loading on upstream drivers and preserves signal edge integrity |
| Operating Temperature | −40°C to +85°C - qualified for industrial ambient environments without derating |
Pinout & Package
MM74HC244MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm body width, 0.65 mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G | Active-low enable for outputs Y1–Y4 | Drives all four outputs high-impedance when logic HIGH; enables buffering when LOW |
| 1A1–1A4 | Inputs for first quad buffer section | Non-inverting inputs tied to upstream data/address lines; no hysteresis |
| 1Y1–1Y4 | Outputs for first quad buffer section | 3-STATE outputs with ±6 mA drive; share common enable (1G) |
| 2G | Active-low enable for outputs Y5–Y8 | Independent control of second quad; allows interleaved or split bus management |
| 2A5–2A8 | Inputs for second quad buffer section | Electrically isolated from first quad; supports separate data path routing |
| 2Y5–2Y8 | Outputs for second quad buffer section | Matched timing and drive strength to Y1–Y4; enables full octal bus isolation |
| VCC, GND | Power and ground terminals | Single-supply operation; decoupling required within 10 mm of pins 10 and 11 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | Enables selective activation of two 4-bit data lanes without external gating logic |
| High noise immunity | CMOS input thresholds (VIH ≥ 3.15 V @ 4.5 V) reject >1.3 V of coupled noise |
| Low dynamic power consumption | CPD = 12 pF per buffer - limits switching current in high-frequency bus applications |
| ESD-protected inputs | Diode clamps to VCC/GND withstand ≥2 kV HBM - reduces need for external TVS on board-level I/O |
| Bus-compatible 3-STATE outputs | Z-state leakage ≤5 µA ensures stable bus voltage during multi-driver arbitration |
Applications
| Microcontroller Bus Expansion | Memory Address Latching |
|---|---|
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to drive 8-bit parallel LCD interface and keypad matrix. IC Role / Device Role / Timing Role: Non-inverting buffer isolating MCU port pins from capacitive display bus; 3-STATE enables shared data line reuse. Use Value: Prevents signal degradation over 80 mm FR-4 traces while allowing tri-state control for bidirectional command/data flow. | Use Scenario: Driving 16-bit address lines from a Z80 CPU to SRAM and EPROM chips on a retro-computing motherboard. IC Role / Device Role / Timing Role: Octal buffer amplifying weak Z80 address outputs; dual enables allow segmented memory window control. Use Value: Ensures setup/hold timing margins are met at 4 MHz clock with 150 pF net capacitance per line. |
| Industrial I/O Module | Legacy Peripheral Interface |
Use Scenario: Level-shifting and buffering digital sensor outputs (e.g., quadrature encoder A/B signals) to a 3.3 V FPGA fabric. IC Role / Device Role / Timing Role: Voltage translation and fanout buffer between 5 V sensors and 3.3 V logic; operates reliably at 2.0 V minimum VCC. Use Value: Eliminates need for discrete level shifters; 14 ns delay preserves encoder edge alignment under 100 kHz rotation rates. | Use Scenario: Interfacing ISA-bus peripherals (e.g., parallel printer port) to modern embedded controllers via FPGA-based bridge logic. IC Role / Device Role / Timing Role: Bidirectional data transceiver enabling legacy 8-bit data strobes; 3-STATE outputs prevent bus contention during DMA cycles. Use Value: Matches ISA timing requirements (tPLZ ≤ 25 ns) while supporting hot-plug detection via enable pin sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244N | PDIP-20 package; higher thermal resistance (θJA = 70°C/W vs. 125°C/W for TSSOP); identical electrical specs | Suitable only for through-hole prototyping or low-density boards; not recommended for automated SMT production | Select SN74HC244N only for hand-soldered evaluation; MM74HC244MTCX preferred for volume SMT assembly. |
| 74VHC244MTC | Higher speed (tPLH = 7.5 ns typ @ 5 V); lower ICC (2 µA typ); same pinout and VCC range (2–5.5 V) | Better suited for >50 MHz bus toggling; requires tighter layout due to faster edges; not rated for 6 V operation | Choose 74VHC244MTC when timing margin is critical and VCC ≤ 5.5 V; retain MM74HC244MTCX for 6 V tolerance or cost-sensitive designs. |
Compared with SN74HC244N and 74VHC244MTC, the MM74HC244MTCX offers optimal balance of industrial temperature range, 6 V absolute maximum rating, TSSOP-20 footprint efficiency, and proven reliability in long-lifecycle embedded systems-making it the default choice where robustness and manufacturability outweigh marginal speed gains.
Availability
MM74HC244MTCX is available at Aetrix Electronics and suitable for microcontroller bus expansion, memory address latching, and industrial I/O module designs requiring stable component supply across extended product lifecycles.
Supply support for MM74HC244MTCX 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, sensing, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The MM74HC244MTCX belongs to ON Semiconductor's legacy HC logic family-designed for robust, pin-compatible replacement of TTL and earlier CMOS buffers in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the maximum supply voltage rating for MM74HC244MTCX?
The MM74HC244MTCX has an absolute maximum supply voltage (VCC) rating of 7.0 V, but its recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V risks exceeding safe operating area limits and may cause irreversible damage. Designers should maintain VCC ≤ 6.0 V in all functional conditions, including power-up transients and ripple.
Does MM74HC244MTCX support 3.3 V logic systems?
Yes, the MM74HC244MTCX fully supports 3.3 V operation: VIH(min) = 2.0 V at VCC = 3.3 V (per interpolation of datasheet VIH curves), VOL(max) = 0.4 V at |IOUT| = 6 mA, and propagation delay remains within specification (≤23 ns). Its 2–6 V supply range makes it interoperable with both 3.3 V and 5 V logic families without level shifters.
How does the dual-enable architecture of MM74HC244MTCX improve system design?
The MM74HC244MTCX uses two independent active-low enables (1G and 2G) to partition its eight buffers into two isolated 4-bit groups. This allows concurrent control of separate data paths-e.g., enabling address and data buses independently-or staggered enable timing to reduce simultaneous switching noise. It eliminates external AND gates needed in single-enable alternatives.
Is MM74HC244MTCX RoHS compliant and lead-free?
Yes, MM74HC244MTCX is RoHS compliant and lead-free. Per ON Semiconductor's packaging documentation, the TSSOP-20 package (MTC20) uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), with no exemptions required under Directive 2011/65/EU. Full compliance documentation is available via ON Semiconductor's product change notices.
Can MM74HC244MTCX replace older 74LS244 devices directly?
MM74HC244MTCX can functionally replace 74LS244 in most applications but is not a direct pin-and-voltage drop-in: it requires VCC = 2–6 V (vs. LS's fixed 5 V), exhibits higher input impedance, and lacks TTL-compatible input thresholds. Interface validation is required-especially for marginal VIH/VIL margins-and decoupling must be optimized for CMOS switching behavior.
MM74HC244MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
MM74HC244MTCX FAQ
1.How can I place an order for MM74HC244MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for MM74HC244MTCX 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 MM74HC244MTCX reliable?
The price and inventory of MM74HC244MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HC244MTCX is usually 5 days.
3.What payment methods are accepted for MM74HC244MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HC244MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM74HC244MTCX?
MM74HC244MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM74HC244MTCX 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 MM74HC244MTCX?
For technical support, including MM74HC244MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HC244MTCX requirements.
6.How does Aetrix verify that MM74HC244MTCX is sourced from the original manufacturer or authorized distributors?
All MM74HC244MTCX 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 MM74HC244MTCX meets industry standards.
7.What is the process for return or replacement of MM74HC244MTCX?
All MM74HC244MTCX units undergo pre-shipment inspection (PSI). If there is an issue with MM74HC244MTCX, 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 MM74HC244MTCX part is unused and in its original packaging.
Return procedure for MM74HC244MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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