My Inquiry
My Account
onsemi DM74ALS244AWMX
- Part No.:
- DM74ALS244AWMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DM74ALS244AWMX.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,298
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DM74ALS244AWMX from Fairchild Semiconductor is an octal 3-STATE bus driver IC designed for bidirectional data bus interfacing in memory, microprocessor, and communication systems. It features two independent 4-bit groups with active-low 3-STATE enable controls, operates at VCC = 4.5–5.5 V, delivers ±24 mA output drive, and guarantees operation from 0°C to +70°C in a 20-lead SOIC package.
For engineers reviewing the DM74ALS244AWMX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL ≤ 20 ns), input loading reduction via PNP inputs, guaranteed switching into 500Ω/50 pF loads, and compatibility with 74LS logic families.
Technical Context
The DM74ALS244AWMX implements two independent 4-bit non-inverting buffer groups, each controlled by a dedicated active-low G̅ input. Its oxide-isolated ion-implanted Schottky TTL process enables improved speed-power trade-offs versus standard LS devices.
Output disable timing (tPLZ ≤ 13 ns, tPHZ ≤ 10 ns) and power-ramp immunity ensure glitch-free bus transitions during power-up/down. Input clamp voltage (VIK = −1.5 V) and low input currents (IIL = −0.1 mA, IIH = 20 µA) support robust noise margin and reduced loading on upstream drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard TTL supply tolerances. |
| IOH / IOL | −15 mA / +24 mA - Supports direct driving of multiple TTL inputs or moderate capacitive loads. |
| tPLH / tPHL | 3 ns to 10 ns - Enables reliable high-speed bus buffering in 20–33 MHz system clock domains. |
| tPZL / tPHZ | 3 ns to 20 ns / 1 ns to 13 ns - Guarantees fast, deterministic 3-STATE entry/exit for time-critical bus arbitration. |
| VIH / VIL | 2.0 V / 0.8 V - Maintains full TTL-compatible input thresholds for seamless integration with legacy logic. |
| ICC (Outputs HIGH) | 9 mA to 15 mA - Reflects low static power consumption relative to standard LS counterparts. |
| Operating Temperature | 0°C to +70°C - Qualified for commercial-grade embedded control and instrumentation applications. |
Pinout & Package
DM74ALS244AWMX is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300-inch body width, with standard pin pitch of 0.050 inch (1.27 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input A1–A8 | Non-inverting data inputs for eight buffer channels; grouped as A1–A4 (pins 1–4) and A5–A8 (pins 5–8). |
| 9, 19 | Enable G1̅, G2̅ | Active-low 3-STATE controls - G1̅ (pin 9) enables Y1–Y4; G2̅ (pin 19) enables Y5–Y8. |
| 11, 12, 13, 14, 15, 16, 17, 18 | Output Y1–Y8 | Buffered non-inverting outputs; Y1–Y4 (pins 11–14) and Y5–Y8 (pins 15–18) correspond to respective input groups. |
| 10, 20 | GND, VCC | Ground reference (pin 10) and positive supply (pin 20); decoupling required within 1 cm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent 4-bit 3-STATE groups | Enables selective isolation of bus segments without external gating logic or multiplexers. |
| Power-ramp 3-STATE retention | Prevents bus contention and glitches during power-up/down sequences without auxiliary reset circuitry. |
| PNP input structure | Reduces input current loading (IIL = −0.1 mA) to minimize fan-out limitations and signal degradation. |
| Guaranteed switching into 500Ω/50 pF | Validates timing performance under realistic PCB trace and load conditions, not just ideal test fixtures. |
| Functional & pin compatibility with 74LS244 | Allows drop-in replacement in existing LS-based designs without layout or firmware changes. |
Applications
| Microprocessor Data Bus Interface | Memory Address Latching |
|---|---|
Use Scenario: Bidirectional data transfer between an 8-bit microprocessor (e.g., Z80 or 8085) and peripheral ICs or RAM chips. IC Role / Device Role / Timing Role: DM74ALS244AWMX acts as a direction-controlled 3-STATE buffer, isolating the CPU data bus from peripherals during idle cycles. Use Value: Enables clean bus sharing with <10 ns propagation delay and sub-20 ns 3-STATE disable time, preventing data corruption during bus handoff. | Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM devices on a shared memory bus. IC Role / Device Role / Timing Role: DM74ALS244AWMX buffers and isolates address signals, reducing capacitive loading and skew across parallel traces. Use Value: Delivers ±24 mA drive strength to meet setup/hold timing across up to 4 memory devices while maintaining TTL-compatible thresholds. |
| Industrial Control Backplane | Legacy Communication Interface |
Use Scenario: Signal conditioning and isolation on a modular PLC backplane where multiple I/O modules share a common data highway. IC Role / Device Role / Timing Role: DM74ALS244AWMX provides galvanically isolated (via downstream optocouplers) but electrically matched bus driving with controlled 3-STATE timing. Use Value: Eliminates bus contention during hot-swap events using power-ramp 3-STATE retention, ensuring deterministic recovery without software intervention. | Use Scenario: Level translation and bus buffering between UART peripherals and RS-232 line drivers in legacy terminal equipment. IC Role / Device Role / Timing Role: DM74ALS244AWMX interfaces TTL-level UART TX/RX signals to discrete level-shifting transistors or MAX232 inputs. Use Value: Maintains signal integrity over long PCB runs with low input loading (IIH = 20 µA) and guaranteed 50 pF load timing, avoiding bit errors at 115.2 kbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-STATE bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS244N | Dual-in-line (PDIP) package; identical electrical specs and pinout; higher θJA (60.5°C/W vs. 79.8°C/W for SOIC). | Suitable for prototyping or through-hole assembly; less suitable for high-density surface-mount production. | Select SN74ALS244N when manual soldering, breadboarding, or legacy board rework is required. |
| 74F244SC | Fast TTL family; faster propagation (tPLH/tPHL ≈ 5.5 ns typ), higher ICC (25 mA), no power-ramp 3-STATE retention feature. | Better for ultra-high-speed timing-critical paths; unsuitable where power sequencing robustness is mandatory. | Choose 74F244SC only if sub-6 ns delay is critical and power sequencing is tightly controlled externally. |
Compared with SN74ALS244N and 74F244SC, the DM74ALS244AWMX uniquely balances SOIC manufacturability, proven power-ramp immunity, and full 74LS compatibility-making it optimal for volume commercial embedded systems requiring reliability and drop-in upgrade paths.
Availability
DM74ALS244AWMX is available at Aetrix Electronics and suitable for microprocessor bus interface, memory subsystem design, and industrial backplane applications requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS244AWMX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016. Its legacy logic families remain widely deployed in industrial and legacy systems.
The DM74ALS244AWMX belongs to the advanced low-power Schottky (ALS) TTL logic family, engineered for high-speed, low-power bus interfacing in commercial-grade computing and control systems.
FAQ
What is the operating temperature range specified for the DM74ALS244AWMX?
The DM74ALS244AWMX is rated for operation from 0°C to +70°C, consistent with commercial-grade TTL specifications. This range is validated across all electrical parameters including propagation delay, output drive, and 3-STATE timing. The device does not support extended industrial (−40°C to +85°C) operation - that grade applies to the DM74ALS244A variant without the "W" suffix.
Is the DM74ALS244AWMX pin-compatible with the standard 74LS244?
Yes, the DM74ALS244AWMX is functionally and pin-compatible with the 74LS244. Both share identical pin assignments, logic behavior, and DC/AC electrical characteristics. This allows direct substitution in existing 74LS244 designs without PCB or firmware modifications, while delivering lower power consumption and improved speed.
Does the DM74ALS244AWMX include power-ramp immunity for 3-STATE outputs?
Yes, the DM74ALS244AWMX incorporates internal circuitry that holds outputs in high-impedance state during VCC ramp-up and ramp-down. This feature prevents bus contention and signal glitches at power-on/off, eliminating the need for external power-on reset synchronization of enable signals in the DM74ALS244AWMX design.
What load conditions are used to specify switching performance for the DM74ALS244AWMX?
Switching characteristics for the DM74ALS244AWMX - including tPLH, tPHL, tPZL, and tPHZ - are guaranteed under a 500Ω resistive load with 50 pF capacitive load, per manufacturer test conditions. This reflects real-world PCB trace impedance and node capacitance, not idealized zero-load measurements.
What is the maximum output current capability of the DM74ALS244AWMX?
The DM74ALS244AWMX supports a LOW-level output current (IOL) of up to +24 mA and a HIGH-level output current (IOH) of −15 mA, measured at VCC = 4.5 V. These values ensure reliable driving of multiple TTL inputs or moderate capacitive loads without external buffers in the DM74ALS244AWMX application.
DM74ALS244AWMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- 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:
- 15mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
DM74ALS244AWMX FAQ
1.How can I place an order for DM74ALS244AWMX through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS244AWMX 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 DM74ALS244AWMX reliable?
The price and inventory of DM74ALS244AWMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS244AWMX is usually 5 days.
3.What payment methods are accepted for DM74ALS244AWMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS244AWMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS244AWMX?
DM74ALS244AWMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS244AWMX 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 DM74ALS244AWMX?
For technical support, including DM74ALS244AWMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS244AWMX requirements.
6.How does Aetrix verify that DM74ALS244AWMX is sourced from the original manufacturer or authorized distributors?
All DM74ALS244AWMX 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 DM74ALS244AWMX meets industry standards.
7.What is the process for return or replacement of DM74ALS244AWMX?
All DM74ALS244AWMX units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS244AWMX, 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 DM74ALS244AWMX part is unused and in its original packaging.
Return procedure for DM74ALS244AWMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DM74ALS244AWMX Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
