SN74HCT573NSRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HCT573NSRG4 is an octal transparent D-type latch bus driver from the HCT logic family, featuring active-low enable control, 50 pF load capacitance, and 6 mA output sink current, in a 20-pin SOIC package for data bus interfacing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HCT573NSRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74HCT573NSRG4?
- 8-bit (octal) transparent D-type latch for parallel data storage
- Active-low output enable control for tri-state bus driving
- HCT logic family — TTL-compatible inputs with CMOS power efficiency
- 50 pF rated load capacitance per output
- 20-pin SOIC (R-PDSO-G20) package for SMT assembly
- Lead-free RoHS JESD-609 e4 compliant
What is SN74HCT573NSRG4 used for?
The SN74HCT573NSRG4 is used in microprocessor and microcontroller data bus interfaces, address latching circuits, and memory decoding systems where an 8-bit transparent latch with TTL-compatible inputs is needed. Its tri-state output and active-low enable also make it a standard choice for bus expansion boards, FPGA I/O buffering, and legacy system address demultiplexing in industrial and embedded designs.
What are the specifications of SN74HCT573NSRG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HCT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.006A |
| 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,.3 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 44ns |
| Propagation Delay (tpd) | 65ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| 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 | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74HCT573NSRG4 datasheet?
SN74HCT573NSRG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HCT573NSRG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many bits does the SN74HCT573NSRG4 latch, and how is its output controlled?
The SN74HCT573NSRG4 latches 8 bits simultaneously in its octal D-type architecture, with output controlled by an active-low output enable signal. When the output enable is asserted low, the 8 outputs drive the latched data onto the bus; when deasserted high, all 8 outputs go to a high-impedance state, allowing the device to share a bus with other drivers in a 3.3 V or 5 V system.
Why is the HCT family version of the 573 latch preferred over the HC version in mixed-logic PCB designs?
The HCT family uses TTL-compatible input thresholds, meaning it recognizes a high logic level at 2.0 V and a low at 0.8 V, which matches the output levels of 5 V TTL and older CMOS devices. This makes the SN74HCT573NSRG4 a direct interface between TTL-output peripherals and 5 V CMOS bus systems, avoiding the level-threshold mismatch that the HC version (with higher input thresholds) would cause.
What output drive current does the SN74HCT573NSRG4 support, and how does that determine fan-out?
The SN74HCT573NSRG4 sinks a maximum of 6 mA per output at the low logic level, with a 50 pF rated load capacitance. This allows it to directly drive several standard TTL or CMOS gate inputs on a shared bus without external buffers, giving a fan-out of approximately 10 standard TTL loads depending on operating frequency and trace length.
In a memory address demultiplexing application, how does the SN74HCT573NSRG4's transparent latch mode work?
In transparent mode, the latch enable input is held high, causing the 8 Q outputs to follow the D inputs continuously so the processor address lines pass through in real time. When the enable is pulled low, the last valid address is captured and held on the Q outputs, decoupling the memory bus from the processor and allowing address lines to be reused for data, a technique common in 8-bit microcontroller multiplexed bus designs running at frequencies up to tens of MHz.
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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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