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NXP Semiconductors N74F244D,602
- Part No.:
- N74F244D,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F244D,602.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,676
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Product details
Overview
N74F244D,602 from Philips Semiconductors is a 20-pin plastic SO (SOT163-1) octal 3-state buffer IC designed for bus interface and memory address register driving. It features dual active-low output enables (OEa, OEb), 64mA low-level output sink current, 15mA high-level source capability, and 4.0ns typical propagation delay at 5V. Used in industrial control backplanes and legacy TTL-compatible data buses.
For engineers reviewing the N74F244D,602 datasheet, N74F244D,602 pinout, N74F244D,602 application, or N74F244D,602 equivalent, key selection criteria include 3-state bus isolation timing, industrial temperature support (-40°C to +85°C), SO package footprint compatibility, and verified 64mA drive strength per output.
Technical Context
The N74F244D,602 implements two independent 4-bit 3-state buffer groups controlled by OEa and OEb. Each group drives four outputs with identical logic polarity and timing behavior. Propagation delay is specified at CL = 50pF and RL = 500Ω across commercial and industrial temperature ranges.
It operates strictly within 4.5V–5.5V supply range and supports TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V). Output disable times (tPHZ/tPLZ) are guaranteed ≤5.5ns, and off-state leakage (IOZL/IOZH) is limited to ±50µA at VCC = 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - Ensures compatibility with standard 5V TTL systems and tolerates ±10% rail variation. |
| Propagation Delay | 4.0ns typical (Ian/Ibn to Yn) - Enables reliable operation in 25MHz+ bus cycles with margin. |
| Output Sink Current | 64mA per output - Drives heavy capacitive loads (e.g., >10 TTL inputs or long PCB traces). |
| Output Source Current | 15mA per output - Sustains valid VOH ≥ 2.7V under load, meeting TTL high-level interface requirements. |
| Input Leakage | ±1.6mA max (IIL/IIH) - Minimizes loading on upstream drivers and preserves fan-out integrity. |
| Operating Temperature | -40°C to +85°C - Qualified for industrial environments without derating or thermal management. |
| Off-State Leakage | ±50µA (IOZL/IOZH) - Prevents unintended signal coupling when outputs are disabled. |
Pinout & Package
Package: 20-lead plastic small outline (SO), body width 7.5 mm, SOT163-1 standard. Surface-mount compatible with JEDEC MS-013AC footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEa | Active-low enable for Yb0–Yb3 outputs; asserts 3-state high-impedance when high. |
| 2–5 | Ia0–Ia3 | Data inputs for Ya0–Ya3 outputs; TTL-compatible voltage thresholds. |
| 6–9 | Yb0–Yb3 | 3-state outputs driven by Ib0–Ib3; each sinks 64mA / sources 15mA. |
| 10 | GND | Power ground reference; decoupling capacitor must be placed adjacent to this pin. |
| 11–14 | Ia0–Ia3 | Data inputs for Ya0–Ya3 outputs; electrically identical to pins 2–5. |
| 15–18 | Ya0–Ya3 | 3-state outputs driven by Ia0–Ia3; fully symmetrical with Yb0–Yb3 group. |
| 19 | OEb | Active-low enable for Ya0–Ya3 outputs; independent control from OEa. |
| 20 | VCC | +5V supply pin; requires local 0.1µF ceramic decoupling to GND (pin 10). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | OEa and OEb allow selective isolation of two 4-bit data paths without external logic. |
| High-current drive capability | 64mA sink per output enables direct connection to multiple TTL loads or unterminated transmission lines. |
| Low input loading | IIL ≤ –1.6mA ensures minimal loading on preceding drivers, preserving signal integrity in cascaded buses. |
| Industrial temperature qualification | Specified performance over –40°C to +85°C eliminates need for thermal derating in embedded control systems. |
| Guaranteed timing margins | tPZH/tPZL ≤ 7.0ns and tPHZ/tPLZ ≤ 5.5ns ensure predictable bus turnaround in synchronous protocols. |
Applications
| Industrial Backplane Interface | Legacy Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating CPU address bus from multiple peripheral modules in programmable logic controllers. IC Role / Device Role / Timing Role: 3-state octal buffer providing bidirectional address isolation with <5.5ns disable time. Use Value: Enables hot-swap module insertion without bus contention; 64mA drive sustains signal integrity across 15cm backplane traces. |
Use Scenario: Driving 16-bit address lines from microcontroller to SRAM/ROM in automotive engine control units. IC Role / Device Role / Timing Role: Unidirectional address line amplifier with TTL-compatible VIH/VIL thresholds. Use Value: Eliminates need for discrete pull-ups; 4.0ns propagation delay supports 20MHz address setup timing. |
| Test Equipment Bus Driver | Industrial I/O Expansion Module |
|
Use Scenario: Level-shifting and buffering digital stimulus signals between FPGA pattern generator and DUT interface. IC Role / Device Role / Timing Role: 3-state driver enabling multiplexed access to shared test bus segments. Use Value: Dual OE control allows precise timing of signal assertion/retraction; ±50µA off-state leakage prevents crosstalk. |
Use Scenario: Expanding GPIO count in PLC I/O base units using parallel bus architecture. IC Role / Device Role / Timing Role: Data path isolator between microcontroller and opto-isolated output drivers. Use Value: Industrial temp rating ensures reliability in cabinet-mounted designs; SO package supports automated assembly. |
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 |
|---|---|---|---|
| SN74F244N | DIP-20 package; identical electrical specs but lacks industrial temp rating (0°C to +70°C only). | Restricted to commercial-grade equipment; unsuitable for uncontrolled ambient environments. | Select SN74F244N only for prototyping or cost-sensitive non-industrial applications where SO mounting is not required. |
| 74ACT244PC | CMOS technology; 5V-tolerant inputs, lower ICC (10µA typ), but reduced sink current (24mA). | Better noise immunity and power efficiency, but insufficient drive for legacy TTL bus termination. | Choose 74ACT244PC for new low-power designs interfacing with CMOS logic; avoid where 64mA sink is mandatory. |
Compared with SN74F244N and 74ACT244PC, the N74F244D,602 uniquely combines industrial temperature support, SO packaging, and full 64mA TTL drive-making it the only drop-in solution for upgrading legacy DIP-based industrial controllers to surface-mount assembly without compromising bus drive capability.
Availability
N74F244D,602 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory address buffering, and test equipment bus driver applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for N74F244D,602 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
Philips Semiconductors (now NXP Semiconductors) is a Dutch semiconductor pioneer known for foundational TTL, F-series logic, and early integrated circuit standardization.
The 74F244 family was engineered for high-speed, high-drive bus interfacing in industrial and telecom infrastructure-prioritizing robustness, timing predictability, and direct TTL compatibility over power efficiency.
FAQ
What is the maximum operating temperature range supported by the N74F244D,602?
The N74F244D,602 is qualified for industrial operation from –40°C to +85°C. This specification is explicitly confirmed in the Philips product datasheet under "Recommended Operating Conditions" and applies to the SOT163-1 (SO20) package variant. No derating is required within this full range.
Does the N74F244D,602 support true 3-state output behavior with defined high-impedance leakage limits?
Yes. The N74F244D,602 guarantees off-state output leakage of ±50µA (IOZL/IOZH) at VCC = 5.5V, as specified in the DC Electrical Characteristics table. This ensures reliable bus isolation when OEa or OEb is asserted high, preventing signal contention in multi-driver systems.
Can the N74F244D,602 drive standard TTL loads directly without external current-limiting resistors?
Yes. With 64mA sink and 15mA source capability per output, the N74F244D,602 meets and exceeds standard TTL fan-out requirements (10x 74LS loads). Its VOH ≥ 2.7V at IOH = –15mA and VOL ≤ 0.55V at IOL = 64mA confirm direct compatibility with TTL input thresholds.
What is the pin 10 function on the N74F244D,602, and why is its placement critical?
Pin 10 is GND-the dedicated power ground reference. Its central location in the 20-pin SO package minimizes ground loop inductance. Philips' layout guidance requires a 0.1µF ceramic decoupling capacitor placed between pin 20 (VCC) and pin 10 (GND) to suppress switching noise and maintain timing stability.
Is the N74F244D,602 pin-compatible with the N74F244N DIP variant?
No. While both share identical logic functionality and signal mapping, the N74F244D,602 uses a 20-lead SO package (SOT163-1) with gull-wing leads and 1.27mm pitch, whereas the N74F244N uses a 20-pin DIP (SOT146-1) with through-hole leads and 2.54mm pitch. PCB layout and assembly processes are not interchangeable.
N74F244D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
N74F244D,602 FAQ
1.How can I place an order for N74F244D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F244D,602 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 N74F244D,602 reliable?
The price and inventory of N74F244D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F244D,602 is usually 5 days.
3.What payment methods are accepted for N74F244D,602?
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4.How is shipping managed for N74F244D,602?
N74F244D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F244D,602 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 N74F244D,602?
For technical support, including N74F244D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F244D,602 requirements.
6.How does Aetrix verify that N74F244D,602 is sourced from the original manufacturer or authorized distributors?
All N74F244D,602 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 N74F244D,602 meets industry standards.
7.What is the process for return or replacement of N74F244D,602?
All N74F244D,602 units undergo pre-shipment inspection (PSI). If there is an issue with N74F244D,602, 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 N74F244D,602 part is unused and in its original packaging.
Return procedure for N74F244D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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