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Product Detailed Parameters
- Description：TXRX IEEE TTL COMPATIBLE 20SOIC
- Series：74ACT
- Mfr：onsemi
- Package：Tube
- Logic Type：IEEE STD 1284 Translation Transceiver
- Supply Voltage：4.5V ~ 5.5V
- Number of Bits：7
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Grade：-
- Qualification：-
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Overview
The onsemi 74ACT1284SC is an IEEE 1284 transceiver housed in a 20-lead SOIC package. It contains four non-inverting bidirectional buffers and three non-inverting buffers with open-drain outputs. The device operates within a supply voltage range of 4.5V to 5.5V and supports temperatures from -40°C to +85°C. It features TTL-compatible inputs, high drive capability on B Ports (14 mA), and guaranteed 4000V minimum ESD protection.
Feature Summary
- Supports IEEE P1284 Level 1 and Level 2 signaling standards for bidirectional parallel communications
- Provides standard signaling method for Extended Capabilities Port (ECP) mode
- Features high drive source/sink capability of 14 mA on B Ports
Applications
- Bidirectional parallel peripheral connections
- Extended Capabilities Port (ECP) mode implementations
- Personal computer to printing peripheral interfaces
Procurement Notes
Verify the specific ordering code suffix against the manufacturer's documentation to confirm the exact package type. The SC designation corresponds to the 20-Lead Small Outline Integrated Circuit (SOIC). Confirm RoHS compliance status through official datasheets or environmental documents before finalizing procurement specifications.
Selection Notes
Select this component when designing systems requiring IEEE 1284 compliant bidirectional data transfer. Ensure the application utilizes a 5V logic family compatible with the specified input thresholds. Verify that the required output drive current aligns with the 14 mA capability provided by the B Ports for reliable signal integrity.
Part Context
This device belongs to the 74ACT logic family, designed for high-speed CMOS applications. It serves as a specialized interface solution for legacy parallel communication protocols. The part integrates both standard and high-drive buffers to manage complex data flow directions between host systems and peripheral devices efficiently.
Replacement Considerations
Check for direct equivalents such as the 74ACT1284MSA (SSOP) or 74ACT1284MTC (TSSOP) if pin compatibility allows. Cross-reference with other manufacturers' IEEE 1284 transceivers ensuring identical pinouts and electrical characteristics are maintained.
