CY74FCT573ATSOCTG4 Texas Instruments Logic Latch ICs (SOIC-20) In Stock
CY74FCT573ATSOCTG4 is an 8-bit transparent D-type latch with 3-state outputs by Texas Instruments in the FCT logic family. Key specs: 64 mA output sink current, 50 pF load, active-low output enable, 20-pin SOIC package. From $0.60, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- SOIC-20
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- CY74FCT573ATSOCTG4 Datasheet PDF
- Category
- Logic Latch ICs
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit transparent D-type latch with 3-state outputs and active-low output enable for direct bus interface control
- High-drive 64 mA sink current capability in the FCT family ensures robust signal integrity on heavily loaded 8-bit data buses
- 20-pin SOIC package with 50 pF load rating, balancing compact PCB footprint with reliable high-speed data latching
Applications
The CY74FCT573ATSOCTG4 is widely employed in microprocessor and DSP systems to demultiplex address/data buses, latching the lower 8 address bits during the address phase so subsequent data cycles can proceed without bus conflicts. Its 64 mA output drive capability makes it effective as a bus extender in backplane designs where multiple memory modules or peripheral cards load the address lines. The device is also used in FPGA prototyping boards and industrial I/O modules requiring a fast, tri-state-capable 8-bit latch for parallel data capture.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | FCT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.064A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 10.6mA |
| Prop. Delay@Nom-Sup | 5.2ns |
| Propagation Delay (tpd) | 8.5ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | HIGH LEVEL |
| Package | SOIC-20 |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the CY74FCT573ATSOCTG4 handle address demultiplexing in an 8-bit microprocessor system?
In multiplexed address/data bus architectures, the CY74FCT573ATSOCTG4 captures the 8 address bits on the rising edge of ALE (address latch enable) by driving its latch enable high. Once ALE goes low, the latch holds the address steady while the bus transitions to data mode, enabling the processor to reuse those 8 pins for data without corrupting the address decode logic. The 64 mA sink current ensures the latched outputs can drive multiple memory chip-select lines simultaneously.
What output drive strength does the CY74FCT573ATSOCTG4 provide compared to standard CMOS logic buffers?
The CY74FCT573ATSOCTG4 provides a maximum output sink current of 64 mA, which is 4 to 8 times higher than the 8–16 mA typical of standard CMOS logic families. This high-drive capability allows it to directly source or sink currents on heavily loaded 8-bit data buses with 50 pF per-line capacitance, maintaining valid logic levels and fast edge rates without external bus repeaters or additional buffer stages.
When would a designer choose the CY74FCT573ATSOCTG4 over an 8-bit D flip-flop such as the 74FCT574?
The 573 transparent latch is preferred over a clocked 574 flip-flop when the bus protocol requires level-sensitive latching — holding data valid as long as the enable signal is asserted — rather than edge-triggered capture. Typical scenarios include ALE-based address latching in Intel-style bus protocols and asynchronous parallel port interfaces. The 574 is better suited for synchronous pipeline stages where data must be captured on a single clock edge and held until the next cycle.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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