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Diodes Incorporated PI74FCT244ATQE
- Part No.:
- PI74FCT244ATQE
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
PI74FCT244ATQE.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,208
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Product details
Overview
PI74FCT244ATQE from Pericom Semiconductor is a fast CMOS non-inverting octal buffer/line driver with 3-state outputs, designed for high-speed bus driving in 5V TTL-compatible systems. It features dual active-low output-enable inputs (OEA/OEB), 25Ω series output resistors to suppress reflections, TTL-level I/O, and operates across –40°C to +85°C. Used in address/data bus buffering for industrial microcontroller systems.
For engineers reviewing the PI74FCT244ATQE datasheet, PI74FCT244ATQE pinout, PI74FCT244ATQE application, or PI74FCT244ATQE equivalent, key selection criteria include propagation delay (≤3.6 ns), output drive strength (64 mA sink), built-in termination, low ground bounce, and QSOP-20 packaging for high-density PCB layouts.
Technical Context
This device implements two independent 4-bit non-inverting buffer sections, each controlled by dedicated 3-state enable inputs (OEA for A-side, OEB for B-side). All eight outputs are TTL-compatible and feature integrated 25Ω series resistors-eliminating external termination components in point-to-point or short-bus applications.
Input hysteresis (200 mV) enhances noise immunity on slow-rising signals, while quiescent ICC ≤ 500 µA and dynamic ICCD ≤ 0.25 mA/MHz support low-power system design. The architecture supports bidirectional bus isolation when paired with complementary drivers like PI74FCT2244ATQE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Non-inverting octal buffer with dual 3-state control (OEA/OEB active-low) |
| Propagation Delay | Max 3.6 ns at CL = 50 pF - enables >270 MHz bus operation with margin |
| Output Drive | 64 mA sink / 15 mA source - drives heavy capacitive loads without external buffers |
| Integrated Termination | 25Ω series resistor per output - eliminates discrete termination resistors on PCB |
| Supply Voltage | 5.0 V ±5% - compatible with standard TTL and 5V CMOS logic rails |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and control systems |
| Input Hysteresis | 200 mV - rejects noise on slow or noisy address/control lines |
Pinout & Package
PI74FCT244ATQE is housed in a Pb-free and RoHS-compliant 20-pin plastic QSOP (150-mil width), with 0.65 mm lead pitch and gull-wing terminations suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low 3-state enable inputs - independently control A-side (pins 2–5, 14–17) and B-side (pins 6–9, 10–13) outputs |
| 2–5, 14–17 | DA0–DA3, OB0–OB3 | A-side inputs (2–5) and B-side outputs (14–17) - non-inverting path A→B |
| 6–9, 10–13 | DB0–DB3, OA0–OA3 | B-side inputs (6–9) and A-side outputs (10–13) - non-inverting path B→A |
| 10 | GND | Ground reference for all I/O and internal circuitry - requires low-impedance PCB plane connection |
| 20 | VCC | 5V power supply - decoupling capacitor (0.1 µF) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Pin compatibility | Drop-in replacement for bipolar 74F244 - same pinout, higher speed, lower power |
| Output impedance control | 25Ω series resistor per output - reduces signal reflections without layout redesign |
| Noise immunity | 200 mV input hysteresis - prevents chatter on marginal clock or control edges |
| Power efficiency | Quiescent ICC ≤ 500 µA - minimizes standby current in always-on industrial modules |
| Signal integrity | Low ground bounce design - maintains logic thresholds during simultaneous switching |
Applications
| Industrial Bus Buffering | Microcontroller Address Latching |
|---|---|
|
Use Scenario: Isolating and strengthening 8-bit data/address buses between MCU and peripheral ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer enabling time-multiplexed bus sharing between CPU, memory, and I/O expanders. Use Value: 3.6 ns propagation delay ensures setup/hold timing compliance at 25 MHz bus clocks; 25Ω outputs prevent overshoot on 50–75 Ω trace impedances. |
Use Scenario: Driving multiplexed address lines from an 8051-family microcontroller to external SRAM or flash memory. IC Role / Device Role / Timing Role: Address line driver with independent OEA/OEB control - allows selective gating of upper/lower address nibbles. Use Value: Dual enable inputs simplify address decode logic; TTL-compatible inputs interface directly to MCU GPIO without level shifters. |
| Legacy System Interfacing | Test Equipment Signal Conditioning |
|
Use Scenario: Bridging modern FPGA I/O banks to legacy TTL peripherals (e.g., parallel printer ports, ISA-style expansion). IC Role / Device Role / Timing Role: Level-shifting and fanout buffer - translates 3.3V FPGA outputs to robust 5V TTL signals with drive capability. Use Value: 64 mA sink current drives long cables or multiple TTL inputs; built-in termination avoids stub reflections in daisy-chained setups. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment before routing to DUT inputs. IC Role / Device Role / Timing Role: Controlled-slew, low-noise buffer stage - isolates pattern generator outputs from variable DUT capacitance. Use Value: Low ground bounce and hysteresis ensure clean edge transitions even under load variation; QSOP package enables compact probe-board integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-inverting octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PI74FCT2244ATQE | Inverting output polarity; otherwise identical pinout, speed, and drive specs | Required where bus inversion is part of protocol (e.g., certain memory read cycles) | Select when signal polarity must be inverted; not interchangeable without logic redesign |
| PI74FCT541ATQE | Input/output pins grouped by function (all inputs on one side, outputs on opposite side); same electrical specs | Preferred for ultra-dense layouts where layer transitions between input and output nets must be minimized | Choose for simplified PCB routing in space-constrained designs; pinout differs - not drop-in |
Compared with PI74FCT2244ATQE and PI74FCT541ATQE, the PI74FCT244ATQE provides non-inverting signal flow with symmetrical I/O placement - optimizing flexibility in bidirectional bus arbitration and mixed-signal board partitioning.
Availability
PI74FCT244ATQE is available at Aetrix Electronics and suitable for industrial bus buffering, microcontroller address latching, and legacy TTL interfacing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PI74FCT244ATQE 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
Pericom Semiconductor was a fabless provider of high-speed interface and signal integrity solutions, acquired by Diodes Incorporated in 2016. Its FCT logic family remains widely deployed in industrial and communications infrastructure.
The PI74FCT244 series belongs to Pericom's Fast CMOS TTL-compatible logic portfolio, engineered specifically for noise-resistant, high-drive bus interfacing in harsh industrial environments with wide temperature tolerance.
FAQ
Is PI74FCT244ATQE pin-compatible with standard 74F244 devices?
Yes - PI74FCT244ATQE uses the exact same 20-pin QSOP footprint and pin assignment as industry-standard 74F244. It delivers identical logic functionality with improved AC/DC performance: faster propagation (3.6 ns vs. ~8 ns), lower ICC (≤500 µA vs. ~20 mA), and integrated 25Ω output resistors not found in bipolar versions.
Can PI74FCT244ATQE operate at 3.3V supply voltage?
No - PI74FCT244ATQE is specified only for 5.0 V ±5% operation. Its TTL-compatible inputs require ≥2.0 V VIH and ≤0.8 V VIL, and internal circuitry is not characterized below 4.5 V. For 3.3V systems, consider Diodes Inc.'s PI74FCT244ATQEX (post-acquisition revision) or compatible 3.3V families like 74LVC244.
What is the purpose of the dual enable inputs OEA and OEB?
OEA controls the A-side outputs (OA0–OA3), while OEB controls the B-side outputs (OB0–OB3). This allows independent 3-state management of two 4-bit channels - enabling bidirectional bus control, partial bus isolation, or staggered enable sequencing to reduce simultaneous switching noise in high-density systems.
Does PI74FCT244ATQE require external pull-up or pull-down resistors on enable inputs?
No - OEA and OEB have TTL-compatible input thresholds and internal biasing sufficient for direct connection to CMOS or TTL logic outputs. However, if left unconnected in a system, they default to HIGH (disabled state) due to internal weak pull-ups; explicit logic control is recommended for deterministic operation.
PI74FCT244ATQE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QSOP
PI74FCT244ATQE FAQ
1.How can I place an order for PI74FCT244ATQE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT244ATQE 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 PI74FCT244ATQE reliable?
The price and inventory of PI74FCT244ATQE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT244ATQE is usually 5 days.
3.What payment methods are accepted for PI74FCT244ATQE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT244ATQE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT244ATQE?
PI74FCT244ATQE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT244ATQE 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 PI74FCT244ATQE?
For technical support, including PI74FCT244ATQE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT244ATQE requirements.
6.How does Aetrix verify that PI74FCT244ATQE is sourced from the original manufacturer or authorized distributors?
All PI74FCT244ATQE 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 PI74FCT244ATQE meets industry standards.
7.What is the process for return or replacement of PI74FCT244ATQE?
All PI74FCT244ATQE units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT244ATQE, 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 PI74FCT244ATQE part is unused and in its original packaging.
Return procedure for PI74FCT244ATQE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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