Thông số kỹ thuật
| thuộc tính | Giá trị |
| Supplier | onsemi |
| Package | Tape & Reel (TR),Cut Tape (CT) |
| Series | 74ACT |
| ProductStatus | Active |
| LogicType | Buffer, Non-Inverting |
| NumberofElements | 2 |
| NumberofBitsperElement | 4 |
| OutputType | 3-State |
| Current-OutputHighLow | 24mA, 24mA |
| Voltage-Supply | 4.5V ~ 5.5V |
| OperatingTemperature | -40°C ~ 85°C (TA) |
| MountingType | Surface Mount |
| Package/Case | 20-SOIC (0.295, 7.50mm Width) |
Tổng quan
Description
Short intro: 74ACT244SCX is an octal buffer/line driver with 3-state outputs from the 74ACT CMOS family.
What it does:
- Provides two 4-bit buffers (A1–A4 to Y1–Y4, and A5–A8 to Y5–Y8).
- Data passes to outputs when the corresponding enable inputs (1OE and 2OE) are active (low).
- Outputs go high-impedance when enables are inactive, allowing bus sharing.
Key points:
- Unidirectional: A inputs drive Y outputs (not bidirectional).
- Power/logic: Typically 4.5–5.5 V operation; TTL-compatible inputs; high-speed CMOS.
- Packaging/variant: SCX indicates a specific package and packaging/temperature option for this part.
Typical uses:
- Buffering data/address lines, driving multiple loads, isolating devices on a shared bus, and speeding up data paths in microprocessor/microcontroller systems.
Note:
- For exact pinout, electrical characteristics, and package details (SCX), consult the manufacturer’s datasheet.
What it does:
- Provides two 4-bit buffers (A1–A4 to Y1–Y4, and A5–A8 to Y5–Y8).
- Data passes to outputs when the corresponding enable inputs (1OE and 2OE) are active (low).
- Outputs go high-impedance when enables are inactive, allowing bus sharing.
Key points:
- Unidirectional: A inputs drive Y outputs (not bidirectional).
- Power/logic: Typically 4.5–5.5 V operation; TTL-compatible inputs; high-speed CMOS.
- Packaging/variant: SCX indicates a specific package and packaging/temperature option for this part.
Typical uses:
- Buffering data/address lines, driving multiple loads, isolating devices on a shared bus, and speeding up data paths in microprocessor/microcontroller systems.
Note:
- For exact pinout, electrical characteristics, and package details (SCX), consult the manufacturer’s datasheet.
Equivalent
74ACT244SCX is an octal buffer/line driver with two 3-state enables (non-inverting). Common equivalents:
- SN74ACT244 (TI)
- MC74ACT244 (Motorola/Onsemi lineage)
- DM74ACT244 (Intersil/Renesas lineage)
- 74HC244 (CMOS, same function)
- 74HCT244 (TTL-input compatible)
Note: check Vcc/speed and packaging (SCX) when substituting.
- SN74ACT244 (TI)
- MC74ACT244 (Motorola/Onsemi lineage)
- DM74ACT244 (Intersil/Renesas lineage)
- 74HC244 (CMOS, same function)
- 74HCT244 (TTL-input compatible)
Note: check Vcc/speed and packaging (SCX) when substituting.
Features
74ACT244SCX Features:
- Octal buffer/line driver with 3-state outputs
- Two 4-bit buffers (groups 1 and 2) with separate active-low enables 1G and 2G
- Non-inverting buffers; TTL/CMOS-compatible inputs
- 5V operating range (typical 4.5–5.5 V)
- High-speed CMOS device with low power consumption
- Tri-state outputs allow bus sharing when enables are deasserted
- 8-pin SC-70/SCX package; Pb-free
- Wide temperature options (industrial variants available)
- Octal buffer/line driver with 3-state outputs
- Two 4-bit buffers (groups 1 and 2) with separate active-low enables 1G and 2G
- Non-inverting buffers; TTL/CMOS-compatible inputs
- 5V operating range (typical 4.5–5.5 V)
- High-speed CMOS device with low power consumption
- Tri-state outputs allow bus sharing when enables are deasserted
- 8-pin SC-70/SCX package; Pb-free
- Wide temperature options (industrial variants available)
Pinout
- Pin count: 20 pins (DIP/SOIC variants).
- Function: Octal buffer/line driver with 3-state outputs. Noninverting buffers for 8 data lines, driven by two independent enable inputs (OE1 and OE2 or G1 and G2), which are active LOW. When enabled, data passes to outputs; when disabled, outputs are high-impedance.
- Function: Octal buffer/line driver with 3-state outputs. Noninverting buffers for 8 data lines, driven by two independent enable inputs (OE1 and OE2 or G1 and G2), which are active LOW. When enabled, data passes to outputs; when disabled, outputs are high-impedance.
Manufacturer
- Manufacturer: STMicroelectronics (ST).
- Company type: A multinational electronics and semiconductor manufacturer (one of the world’s largest semiconductor companies).
- Company type: A multinational electronics and semiconductor manufacturer (one of the world’s largest semiconductor companies).
Application
74ACT244SCX is an octal buffer/line driver with two 4-bit sections and tri-state outputs (OE1, OE2). Typical application areas:
- Buffering and isolating data/address buses between a microprocessor and memory or peripherals
- Driving long or multi-drop buses thanks to tri-state outputs (bus driver)
- Level-shifting/interface between TTL/CMOS or different supply domains
- Boosting fan-out and noise immunity in high-speed digital systems
- Temporary data storage/isolation in test fixtures and embedded controllers
- General-purpose digital buffering for PCB designs, bus expansion, and I/O interfacing
- Buffering and isolating data/address buses between a microprocessor and memory or peripherals
- Driving long or multi-drop buses thanks to tri-state outputs (bus driver)
- Level-shifting/interface between TTL/CMOS or different supply domains
- Boosting fan-out and noise immunity in high-speed digital systems
- Temporary data storage/isolation in test fixtures and embedded controllers
- General-purpose digital buffering for PCB designs, bus expansion, and I/O interfacing
Package
Package type: 20‑pin Small Outline (SOIC) surface‑mount package.
