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STMicroelectronics 74AC573TTR
- Part No.:
- 74AC573TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC573TTR.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
74AC573TTR from STMicroelectronics is an advanced high-speed CMOS octal D-type latch with non-inverting 3-state outputs, designed for bus interface and data buffering in 5V and mixed-voltage systems. It features 4.5ns typical propagation delay at 5V, ±24mA output drive, 2V–6V operating voltage range, and latch enable (LE) plus output enable (OE) control logic. Used in microcontroller address/data bus latching and memory I/O expansion.
For engineers reviewing the 74AC573TTR datasheet, 74AC573TTR pinout, 74AC573TTR application, or 74AC573TTR equivalent, key selection criteria include 3-state output timing symmetry (tPLH ≅ tPHL), 50Ω transmission line driving capability, latch-enable edge sensitivity, and TSSOP-20 package thermal performance in space-constrained PCB layouts.
Technical Context
The 74AC573TTR implements a dual-control synchronous latch architecture: LE determines when D-inputs are captured into internal storage, while OE independently enables or disables all eight Q-outputs into high-impedance state. Its sub-micron C2MOS process ensures latch-up immunity and ESD robustness (2kV HBM).
It operates across industrial temperature range (−55°C to +125°C) with rail-to-rail input compatibility (VI = 0 to VCC) and symmetrical output drive (|IOH| = |IOL| ≥ 24mA at VCC = 5V). Propagation delays are balanced (tPLH ≅ tPHL), supporting clean signal integrity on bidirectional buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| tPD (typ) | 4.5ns at VCC = 5V - enables sub-10ns cycle timing in high-speed bus interfaces |
| VCC Range | 2V to 6V - supports interoperability between 3.3V and 5V logic domains |
| IOL / IOH (min) | 24mA - drives 50Ω transmission lines directly without external buffers |
| ICC (max) | 4µA at TA = 25°C - ultra-low static power for battery-backed or always-on systems |
| VIH / VIL (min/max) | 2.1V/0.9V at VCC = 3V - provides 28% VCC noise margin for reliable switching |
| tPZL / tPLZ (max) | 13.5ns at VCC = 5V - ensures fast output enable/disable for dynamic bus arbitration |
| CIN / COUT | 4pF / 8pF - minimizes capacitive loading on driving gates and stubbed traces |
Pinout & Package
TSSOP-20 package: 6.5mm × 4.4mm body, 0.65mm pitch, 1.1mm height, lead-free, moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Asynchronous Output Enable | Active-low control of all Q0–Q7 outputs; overrides latch state to force high-Z |
| 2–9 (D0–D7) | Data Inputs | Edge-transparent inputs latched on LE falling edge; accept 0–VCC logic levels |
| 11 (LE) | Latch Enable | Falling-edge sensitive capture control; samples Dn and holds Qn until next LE low |
| 12–19 (Q0–Q7) | 3-State Non-Inverting Outputs | Drive high/low or enter high-impedance per OE; support bidirectional bus sharing |
| 10 (GND) | Ground Reference | 0V return path for all internal logic and output drivers |
| 20 (VCC) | Positive Supply | Primary power rail; supports 2–6V operation with internal regulation tolerance |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Independent OE pin allows dynamic bus contention avoidance without disrupting latch state |
| Balanced Propagation Delays | tPLH ≅ tPHL ensures minimal skew between rising/falling transitions on shared data lines |
| 50Ω Transmission Line Drive | ±24mA drive strength matches standard PCB trace impedance for reduced reflections |
| High Noise Immunity | 28% VCC noise margin (VIH/VIL) prevents false triggering in electrically noisy environments |
| Enhanced Latch-Up Immunity | Sub-micron C2MOS process eliminates destructive latch-up under transient overvoltage conditions |
Applications
| Microcontroller Bus Interface | Memory Address Latching |
|---|---|
Use Scenario: Isolating and latching 8-bit address/data bus signals between an MCU and peripheral ICs. IC Role / Device Role / Timing Role: Acts as transparent latch during LE high, then holds stable address during memory access cycles. Use Value: Enables single-cycle bus multiplexing without external glue logic or timing constraints from MCU clock jitter. | Use Scenario: Capturing and holding lower-address bits for static RAM or EPROM access. IC Role / Device Role / Timing Role: Stores address nibble during ALE pulse; outputs held stable throughout read/write window. Use Value: Eliminates need for external address demultiplexers and reduces PCB routing complexity. |
| Industrial I/O Expansion | Digital Signal Routing Hub |
Use Scenario: Buffering and isolating digital I/O lines in PLC backplane modules. IC Role / Device Role / Timing Role: Provides galvanically isolated (via PCB layout) signal staging with configurable output enable. Use Value: Supports hot-swap-safe I/O reconfiguration via OE-controlled high-Z state during module insertion. | Use Scenario: Dynamically routing sensor data streams between multiple ADCs and a central processor. IC Role / Device Role / Timing Role: Serves as programmable signal selector using LE/OE coordination to gate data paths. Use Value: Reduces FPGA I/O resource usage by offloading deterministic signal path switching to dedicated logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC573PW | TSSOP-20, identical AC/DC specs, TI-branded; same pinout and timing but different ESD rating (1.5kV vs 2kV) | Valid for commercial-temp designs where 2kV ESD is not required | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation |
| 74VHC573FT | Same function, but VHCT family: TTL-compatible inputs (VIH = 2.0V min @ VCC = 4.5V), slightly higher ICC (20µA max) | Better suited for legacy 5V TTL system integration with marginal noise margins | Choose when interfacing with older 74LS/74ALS logic families needing guaranteed VIH recognition |
Compared with SN74AC573PW and 74VHC573FT, the 74AC573TTR offers superior ESD immunity and lower quiescent current, making it preferred for extended-temperature industrial deployments where reliability and power efficiency are critical.
Availability
74AC573TTR is available at Aetrix Electronics and suitable for microcontroller bus interfaces, memory address latching, and industrial I/O expansion requiring stable component supply across extended temperature ranges.
Supply support for 74AC573TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.
The 74AC573 belongs to ST's high-speed AC logic family, engineered for low-power, high-noise-immunity bus interfacing in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the maximum operating temperature range for the 74AC573TTR?
The 74AC573TTR is rated for operation from −55°C to +125°C, validated per STMicroelectronics' industrial-grade qualification standards. This full range is supported across all DC and AC specifications in the official datasheet, including propagation delay, output drive, and leakage current limits.
Can the 74AC573TTR operate reliably at 3.3V supply?
Yes - the device is fully specified from 2V to 6V, with guaranteed parameters at 3.3V (e.g., tPD = 6.0ns typ, VIH = 2.1V min, VOL = 0.1V max at 12mA). Its rail-to-rail input structure and 28% noise margin ensure robust operation in mixed-voltage 3.3V/5V systems.
Is the 74AC573TTR pin-compatible with standard 74LS573 devices?
Yes - it is functionally and pin-compatible with 74LS573 and 74HC573, sharing identical pinout, truth table, and logic behavior. However, it requires no pull-up resistors on OE/LE, draws significantly less supply current, and delivers faster switching with higher drive strength.
Does the 74AC573TTR require external decoupling capacitors?
Yes - STMicroelectronics recommends minimum 100nF ceramic capacitor between VCC and GND, placed within 5mm of pins 20 and 10. This suppresses high-frequency supply noise generated during simultaneous output switching, ensuring stable 4.5ns propagation delay and preventing ground bounce-induced glitches.
74AC573TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 2V ~ 6V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 4.5ns
- Current - Output High, Low:
- 24mA, 24mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74AC573TTR FAQ
1.How can I place an order for 74AC573TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC573TTR 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 74AC573TTR reliable?
The price and inventory of 74AC573TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC573TTR is usually 5 days.
3.What payment methods are accepted for 74AC573TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC573TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC573TTR?
74AC573TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC573TTR 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 74AC573TTR?
For technical support, including 74AC573TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC573TTR requirements.
6.How does Aetrix verify that 74AC573TTR is sourced from the original manufacturer or authorized distributors?
All 74AC573TTR 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 74AC573TTR meets industry standards.
7.What is the process for return or replacement of 74AC573TTR?
All 74AC573TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC573TTR, 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 74AC573TTR part is unused and in its original packaging.
Return procedure for 74AC573TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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