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onsemi 74FR244PC
- Part No.:
- 74FR244PC
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74FR244PC.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,136
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Product details
Overview
74FR244PC from Fairchild Semiconductor is a non-inverting octal buffer/line driver with 3-STATE outputs, designed for memory address driving, clock distribution, and bus-oriented transmitter/receiver functions. It operates from +4.5V to +5.5V, sinks up to 64 mA per output, sources 15 mA, and guarantees pin-to-pin skew of ≤1.6 ns (HL) in PDIP-20 package.
For engineers reviewing the 74FR244PC datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE bus drive capability, ±15 mA/64 mA drive strength, sub-4 ns propagation delay at 50 pF, guaranteed skew performance, and compatibility with TTL-level control logic in industrial memory and address buffering systems.
Technical Context
The 74FR244PC implements dual 4-bit non-inverting buffers with independent active-low output enables (OE1, OE2), enabling selective 3-STATE control of two groups of four outputs. Each output supports rail-to-rail switching under 5 V supply and exhibits matched propagation delays across all eight channels.
Its design targets high-speed digital bus interfacing where timing integrity and low-output-impedance drive are required-specifically in address/data multiplexing, clock fanout, and bidirectional bus isolation applications within legacy TTL and mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +4.5 V to +5.5 V - Ensures compatibility with standard 5 V TTL and CMOS logic rails. |
| IOL / IOH | 64 mA sink / 15 mA source - Drives heavy capacitive loads and multiple TTL inputs without external buffering. |
| tPLH / tPHL | Max 3.9 ns @ 50 pF - Enables operation in high-speed address and control paths up to ~200 MHz effective toggle rate. |
| tOSHL Skew | ≤1.6 ns - Guarantees synchronized edge alignment across all eight outputs for clean bus transitions. |
| VIH / VIL | 2.0 V / 0.8 V - Fully compatible with standard TTL input thresholds for seamless integration. |
| ICCZ (3-STATE) | Max 50 mA - Low quiescent current when outputs disabled, reducing system standby power. |
Pinout & Package
74FR244PC is housed in a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001 compliant, 0.300" wide, with through-hole mounting and standard 0.1" pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9 | I0–I3, I4–I7 | Non-inverting data inputs - Accept TTL-compatible logic levels to enable corresponding outputs. |
| 11, 13, 15, 17, 18, 19, 20, 2 | O0–O3, O4–O7 | 3-STATE buffered outputs - Drive buses or registers; high-impedance when OE asserted. |
| 12, 14, 16, 18 | OE1 | Active-low group enable (pins 12,14,16,18 control O0–O3) |
| 3, 5, 7, 9 | OE2 | Active-low group enable (pins 3,5,7,9 control O4–O7) |
| 10 | GND | Ground reference for all logic and output stages. |
| 20 | VCC | +5 V supply rail - Powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual 4-bit enables | OE1 and OE2 allow separate control of two 4-bit output groups - simplifies partial bus gating without external logic. |
| Guaranteed pin-to-pin skew | tOSHL ≤1.6 ns ensures simultaneous output transitions - critical for glitch-free address/data strobing. |
| High-current 3-STATE outputs | 64 mA sink capability drives 10+ TTL loads or 50 pF lines - eliminates need for external line drivers in dense PCB layouts. |
| TTL-compatible input thresholds | VIH = 2.0 V, VIL = 0.8 V - interoperates directly with legacy 74LS/74F families without level-shifting. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in embedded control systems. IC Role / Device Role / Timing Role: Non-inverting octal buffer isolating and strengthening address signals while enabling bus sharing via 3-STATE control. Use Value: Prevents address skew and signal degradation over long traces; OE groups allow dynamic bank selection without contention. | Use Scenario: Fanout of a single system clock to multiple peripherals (e.g., UART, timer, ADC) in industrial PLC modules. IC Role / Device Role / Timing Role: Low-skew clock driver delivering synchronized edges to multiple destinations with minimal jitter accumulation. Use Value: ≤1.6 ns pin-to-pin skew maintains setup/hold margins across receivers; 3-STATE allows clock gating during sleep modes. |
| Bus-Oriented Transmitter | Legacy Data Bus Isolation |
Use Scenario: Transmitting 8-bit parallel data from CPU to peripheral controller (e.g., display driver or I/O expander) on shared data bus. IC Role / Device Role / Timing Role: Bidirectional bus interface component acting as controlled transmitter with tri-state output disable. Use Value: Enables time-multiplexed bus sharing; 64 mA drive ensures reliable logic levels even with 3–4 downstream devices loaded. | Use Scenario: Isolating legacy ISA or PC/104 bus segments to prevent noise coupling between CPU and expansion cards. IC Role / Device Role / Timing Role: Unidirectional buffer providing electrical separation and drive strength restoration between bus segments. Use Value: Eliminates reflections and ground bounce; independent OE pins permit segment-by-segment activation for diagnostics or hot-swap sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74F244N | Same pinout, identical function, but F-series uses bipolar TTL process - higher ICC (max 110 mA), slower tPHL (5.5 ns), no guaranteed skew spec. | Acceptable where skew tolerance >3 ns and power budget permits higher ICC. | Prefer 74FR244PC for timing-critical or low-power 5 V systems requiring guaranteed skew. |
| SN74ACT244N | CMOS-based, 5 V tolerant, VIH/VIL aligned to ACT logic (2.0 V/0.8 V), but tPLH/tPHL max 8.5 ns and no skew guarantee. | Suitable for mixed-voltage interfaces needing 5 V input tolerance, but not for sub-4 ns timing paths. | Choose SN74ACT244N only if 5 V-tolerant inputs are mandatory and skew is not constrained. |
Compared with 74F244N and SN74ACT244N, the 74FR244PC uniquely delivers guaranteed ≤1.6 ns HL skew and 3.9 ns max propagation delay at lower ICCZ, making it optimal for deterministic timing in memory and clock distribution where synchronization and power efficiency are jointly critical.
Availability
74FR244PC is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus-oriented transmitter/receiver, and legacy data bus isolation applications requiring stable component supply and long-term industrial availability.
Supply support for 74FR244PC 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 manufacturer specializing in analog, power, and logic ICs before its acquisition by ON Semiconductor in 2016.
The 74FR244PC belongs to Fairchild's FR-series fast TTL-compatible logic family, engineered for high-speed, low-skew bus interface applications in industrial and computing systems operating at 5 V.
FAQ
What is the maximum output sink current specification for the 74FR244PC?
The 74FR244PC is rated for a maximum output sink current (IOL) of 64 mA per output pin under DC conditions, as specified in the Absolute Maximum Ratings and confirmed in the DC Electrical Characteristics table. This rating applies when VOL ≤ 0.55 V and ensures robust drive capability into heavy TTL loads or distributed bus capacitance. The 74FR244PC maintains this performance across its full operating temperature range (0°C to +70°C).
Does the 74FR244PC support true 3-STATE operation with high-impedance outputs?
Yes, the 74FR244PC provides true 3-STATE (high-impedance) outputs controlled by two independent active-low enable inputs (OE1 and OE2). When either OE is HIGH, its associated four outputs enter high-impedance state with leakage current ≤±20 µA (IOZL/IOZH), verified per DC Electrical Characteristics. This enables safe bus sharing and prevents contention in multi-driver systems.
What is the guaranteed pin-to-pin output skew for the 74FR244PC?
The 74FR244PC guarantees pin-to-pin output skew of ≤1.6 ns for HIGH-to-LOW transitions (tOSHL), ≤1.0 ns for LOW-to-HIGH transitions (tOSLH), and ≤3.5 ns for mixed transitions (tOST), as documented in the AC Electrical Characteristics table. These values are production-tested limits-not typical or calculated-and apply across the full commercial temperature range (0°C to +70°C) with VCC = +5.0 V.
Can the 74FR244PC operate reliably at 4.5 V supply voltage?
Yes, the 74FR244PC is fully specified to operate over a VCC range of +4.5 V to +5.5 V. All key parameters-including VOH ≥ 2.4 V (at IOH = −3 mA), VOL ≤ 0.55 V (at IOL = 64 mA), and tPLH/tPHL ≤ 3.9 ns-are guaranteed at VCC = +4.5 V. This makes the 74FR244PC suitable for systems with marginal 5 V rails or brown-out resilience requirements.
Is the 74FR244PC pin-compatible with other 74xx244 variants like the 74LS244 or 74HC244?
The 74FR244PC shares the same 20-pin PDIP footprint and pin assignment (N20A package) with 74LS244, 74F244, and 74HC244, making it physically pin-compatible. However, electrical behavior differs: the 74FR244PC offers superior speed (sub-4 ns delay vs. 15–25 ns for LS/HC), higher drive strength (64 mA vs. 8–24 mA), and guaranteed skew-so functional substitution requires validation of timing, loading, and power constraints in the target design.
74FR244PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74FR
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74FR244PC FAQ
1.How can I place an order for 74FR244PC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FR244PC 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 74FR244PC reliable?
The price and inventory of 74FR244PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FR244PC is usually 5 days.
3.What payment methods are accepted for 74FR244PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FR244PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FR244PC?
74FR244PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FR244PC 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 74FR244PC?
For technical support, including 74FR244PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FR244PC requirements.
6.How does Aetrix verify that 74FR244PC is sourced from the original manufacturer or authorized distributors?
All 74FR244PC 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 74FR244PC meets industry standards.
7.What is the process for return or replacement of 74FR244PC?
All 74FR244PC units undergo pre-shipment inspection (PSI). If there is an issue with 74FR244PC, 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 74FR244PC part is unused and in its original packaging.
Return procedure for 74FR244PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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