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STMicroelectronics M74HC244RM13TR
- Part No.:
- M74HC244RM13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
M74HC244RM13TR.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,770
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Product details
Overview
M74HC244RM13TR from STMicroelectronics is an octal non-inverting 3-state bus buffer IC designed for bidirectional data bus interfacing in memory address and peripheral driver circuits. It features 20-pin TSSOP package, 2V–6V operating voltage, 10ns typical propagation delay at 6V, ±7.8mA output drive, and high noise immunity (28% VCC min). Used in industrial control backplanes and microcontroller I/O expansion.
For engineers reviewing the M74HC244RM13TR datasheet, M74HC244RM13TR pinout, M74HC244RM13TR application, or M74HC244RM13TR equivalent, key selection criteria include 3-state enable timing (tPZL/tPLZ), symmetrical output drive (|IOH| = IOL ≥ 6mA), wide VCC range compatibility, and TSSOP-20 thermal performance under sustained bus loading.
Technical Context
The device implements two independent 4-bit non-inverting buffer groups (1Y/1A and 2Y/2A), each controlled by a dedicated active-low output enable (1G, 2G). All inputs include ESD protection diodes and transient voltage clamping.
Propagation delays are balanced (tPLH ≅ tPHL), output impedance is symmetrical, and DC input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), enabling robust operation across the full 2–6V supply range in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports direct interface with 3.3V and 5V logic domains without level shifters |
| tPD (Typ.) | 10ns at VCC = 6V - enables ≤50MHz bus operation with margin for trace delay |
| IOL / IOH | ±7.8mA at VCC = 6V - drives up to 10 LS-TTL loads or 20 CMOS loads per output |
| VIH / VIL | 0.7×VCC / 0.3×VCC - ensures noise margins >1.4V at 5V and >0.9V at 3.3V |
| ICC (Max) | 4µA at TA = 25°C - negligible quiescent power in battery-backed or low-power standby modes |
| Output Enable Time | tPZL = 14ns (typ.) at VCC = 6V - allows fast bus arbitration and dynamic channel switching |
Pinout & Package
Package: TSSOP-20 (6.5mm × 4.4mm, 0.65mm pitch), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G, 2G - Output Enable Inputs | Active-low controls enable/disable of respective 4-bit buffer groups; TTL/CMOS compatible |
| 2,4,6,8 / 11,13,15,17 | 1A1–1A4, 2A1–2A4 - Data Inputs | High-impedance CMOS inputs with hysteresis-free thresholds; accept 0–VCC swing |
| 3,5,7,9 / 12,14,16,18 | 1Y1–1Y4, 2Y1–2Y4 - Data Outputs | 3-state outputs with symmetrical sourcing/sinking; Z-state leakage < 10µA at 125°C |
| 10 | GND | Ground reference for all I/O and internal logic; requires low-inductance PCB connection |
| 20 | VCC | Positive supply; decoupling capacitor (100nF) required within 5mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible with 74LS244 | Direct drop-in replacement for legacy TTL bus drivers without redesign |
| Wide VCC range (2–6V) | Eliminates need for separate 3.3V/5V supply rails in mixed-signal embedded systems |
| Low ICC (4µA max) | Reduces system-level standby current by >95% vs. equivalent bipolar buffers |
| High noise immunity (28% VCC) | Withstands >1.4V fast transients on shared PCB traces without false triggering |
| Controlled output transition time | tTLH/tTHL = 6–15ns (6V) - limits simultaneous switching noise (SSN) in dense layouts |
Applications
| Industrial PLC Backplane Interface | Microcontroller I/O Expansion |
|---|---|
Use Scenario: Isolating CPU address/data buses from modular I/O cards in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing read/write direction and bus contention during hot-swap events. Use Value: Enables deterministic bus release within 23ns (tPLZ max @ 125°C), preventing data corruption during card insertion/removal. | Use Scenario: Extending GPIO count of ARM Cortex-M0+ MCU in smart sensor node with SPI/I²C peripherals. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer between 3.3V MCU and 5V analog front-end or display drivers. Use Value: Supports 2V–6V operation without external level shifters, reducing BOM count and layout area by 30%. |
| Automotive Body Control Module | Test Equipment Signal Routing |
Use Scenario: Multiplexing sensor inputs (LIN, PWM, analog) onto shared diagnostic bus in BCM subassembly. IC Role / Device Role / Timing Role: Enabling/disabling signal paths under microcontroller command during self-test sequences. Use Value: Guaranteed operation from −40°C to 125°C with <0.4V VOL at 6mA load ensures reliable fault reporting in engine bay environments. | Use Scenario: Reconfigurable signal path switching in automated test fixture for mixed-signal PCB validation. IC Role / Device Role / Timing Role: Dynamic routing of stimulus signals between DUT pins and measurement instruments via FPGA-controlled enables. Use Value: 10ns tPD and matched tPLH/tPHL minimize skew-induced measurement error in high-speed digital pattern capture. |
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 |
|---|---|---|---|
| SN74HC244PWR | Same logic function, 20-pin TSSOP, but TI-spec VCC range (2–6V), slightly higher ICC (8µA max) | Qualified to AEC-Q100 Grade 2; preferred for automotive production where qualification documentation is mandatory | Select when automotive qualification or TI ecosystem alignment is required |
| 74VHC244M | Higher speed (tPD = 5.5ns typ. @ 5V), lower drive (±8mA), same pinout; operates down to 2V | Better suited for high-frequency clock distribution or fast data capture where propagation delay dominates timing budget | Select when sub-6ns delay is critical and 5V-only operation is acceptable |
Compared with SN74HC244PWR, M74HC244RM13TR offers lower quiescent current and broader temperature support (−55°C to +125°C); versus 74VHC244M, it trades 4.5ns delay for wider VCC flexibility and superior noise immunity-ideal for industrial backplane reliability over raw speed.
Availability
M74HC244RM13TR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and microcontroller I/O expansion requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for M74HC244RM13TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad portfolio coverage.
M74HC244RM13TR belongs to the M74HC high-speed CMOS logic family, engineered for robust interoperability between legacy TTL and modern low-voltage systems in harsh-environment embedded applications.
FAQ
What is the maximum output current per pin for M74HC244RM13TR?
The device delivers ±7.8mA per output at VCC = 6V and TA = 25°C, with guaranteed minimum of ±6mA across −55°C to +125°C. This rating applies under steady-state DC conditions; pulsed current capability is higher but must respect absolute maximum ratings (±35mA) and thermal limits.
Does M74HC244RM13TR support hot-swap operation?
Yes - its 3-state outputs exhibit controlled enable/disable timing (tPZL/tPLZ ≤ 32ns max at 6V) and low off-state leakage (<10µA at 125°C), enabling safe insertion/removal in live backplane systems when paired with series current-limiting resistors and proper sequencing of G inputs.
Can M74HC244RM13TR operate at 2.5V supply?
Yes - the device is fully specified from 2V to 6V. At 2.5V, VIH = 1.75V (min), VIL = 0.75V (max), and VOH/VOL meet rail-to-rail logic thresholds with 20µA load. Propagation delay increases to 90ns (max), making it suitable for low-speed control interfaces but not high-frequency buses.
Is there a pin-compatible 74HC244 variant with integrated ESD protection beyond the standard diodes?
No - M74HC244RM13TR includes standard input ESD protection (±2kV HBM), consistent with the baseline 74HC family. For enhanced ESD robustness (e.g., ±8kV contact), STMicroelectronics recommends the M74HC244B1R (DIP-20) or discrete TVS solutions; no pin-compatible HC variant adds extra protection without package or logic changes.
M74HC244RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
M74HC244RM13TR FAQ
1.How can I place an order for M74HC244RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC244RM13TR 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 M74HC244RM13TR reliable?
The price and inventory of M74HC244RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC244RM13TR is usually 5 days.
3.What payment methods are accepted for M74HC244RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC244RM13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC244RM13TR?
M74HC244RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC244RM13TR 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 M74HC244RM13TR?
For technical support, including M74HC244RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC244RM13TR requirements.
6.How does Aetrix verify that M74HC244RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC244RM13TR 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 M74HC244RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC244RM13TR?
All M74HC244RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC244RM13TR, 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 M74HC244RM13TR part is unused and in its original packaging.
Return procedure for M74HC244RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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