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STMicroelectronics 74LVC573ATTR
- Part No.:
- 74LVC573ATTR
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVC573ATTR.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
74LVC573ATTR from STMicroelectronics is an octal D-type transparent latch with 3-state outputs, designed for voltage-level translation and bus interface in 1.65–3.6 V systems. It features latch enable (LE) and output enable (OE) controls, symmetrical ±24 mA drive at 3.0 V, 6.8 ns max propagation delay, and 5V-tolerant inputs-enabling direct interfacing between LVC logic and legacy 5V TTL/NMOS components in industrial control backplanes.
For engineers reviewing the 74LVC573ATTR datasheet, 74LVC573ATTR pinout, 74LVC573ATTR application, or 74LVC573ATTR equivalent, key selection criteria include its 3.6 V absolute max supply rating, high-impedance output state under OE high, balanced tPLH/tPHL propagation delays, and guaranteed PCI bus compatibility at 24 mA drive strength.
Technical Context
This device implements a dual-control latching architecture: LE governs data capture (transparent when high, latched on falling edge), while OE independently enables/disables all eight Q outputs into high-Z or active logic states. Its sub-micron C2MOS process ensures latch-up immunity >500 mA and ESD robustness (HBM >2 kV, MM >200 V).
Input thresholds are VIL ≤ 0.35VCC and VIH ≥ 0.65VCC across 1.65–3.6 V operation, supporting reliable interfacing with mixed-voltage sources. Output drive capability scales with VCC: ±4 mA at 1.65 V, ±8 mA at 2.3 V, ±12 mA at 2.7 V, and ±24 mA at 3.0–3.6 V-enabling predictable fan-out planning in multi-load bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 1.65 V to 3.6 V - supports single-supply operation across 1.8 V, 2.5 V, and 3.3 V logic domains |
| Max Propagation Delay | 6.8 ns at VCC = 3.0–3.6 V - enables reliable timing in 100+ MHz bus applications |
| Output Drive Strength | ±24 mA at VCC = 3.0–3.6 V - meets PCI bus loading requirements and drives 10+ LVTTL loads |
| Input Voltage Tolerance | 0 V to 5.5 V - allows safe connection to 5 V signals without external level shifters |
| Quiescent Supply Current | 10 µA max at VCC = 3.6 V - minimizes standby power in battery-backed or low-power systems |
| Output Skew | ≤1 ns (tOSLH/tOSHL) - ensures simultaneous switching of all 8 outputs for clean bus transitions |
| ESD Rating | HBM >2000 V, MM >200 V - provides robust handling in automated assembly and field service |
Pinout & Package
TSSOP-20 package (6.5 mm × 4.4 mm, 0.65 mm pitch), thermally enhanced for high-density PCB layouts and reflow-compatible with standard JEDEC profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state output enable | Drives all Q0–Q7 into high-impedance when high; enables normal logic output when low |
| 2–9 (D0–D7) | Data inputs | Accept 5V-tolerant logic levels; sample and hold values on LE falling edge |
| 11 (LE) | Latch enable | Transparent mode when high; captures D-input state on falling edge and holds until next LE pulse |
| 12–19 (Q0–Q7) | 3-state latch outputs | Reflect latched D-data when OE low; enter high-Z when OE high - enabling shared bus arbitration |
| 10 (GND) | Ground reference | Return path for all input/output currents; must be low-inductance connection for noise control |
| 20 (VCC) | Positive supply | Primary power rail (1.65–3.6 V); decoupling capacitor required within 5 mm for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Enables direct connection to 5 V microcontrollers or legacy peripherals without external resistors or translators |
| Symmetrical output drive | IOH = IOL = ±24 mA at 3.3 V ensures matched rise/fall times and reduced signal distortion on bidirectional buses |
| Power-down protection | Inputs and outputs remain high-impedance during VCC = 0 V, preventing back-driving of powered subsystems |
| Latch-up immunity | Exceeds 500 mA per JESD17 - eliminates risk of destructive latch-up in noisy industrial environments |
| Balanced propagation delays | tPLH ≅ tPHL minimizes duty cycle distortion in clocked bus interfaces and synchronous data transfers |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) I/O Expansion |
|---|---|
|
Use Scenario: Isolating and buffering sensor/actuator data between 3.3 V MCU and 5 V analog front-end or relay drivers on a modular I/O card. IC Role / Device Role / Timing Role: Octal latch providing level-shifted, noise-immune data staging with precise LE-controlled sampling aligned to system sync pulses. Use Value: Eliminates need for discrete level shifters; ±24 mA drive directly drives optocoupler LEDs and relay coils without buffer transistors. |
Use Scenario: Expanding GPIO count for door lock, window lift, and lighting control in a CAN-connected BCM using space-constrained TSSOP packaging. IC Role / Device Role / Timing Role: Bus-isolated latch holding command states during MCU sleep cycles, with OE enabling selective wake-up of peripheral subsystems. Use Value: Power-down protection prevents current leakage through unpowered modules; 1.65 V min VCC supports ultra-low-power sleep modes. |
| PCI Bus-Compatible Peripheral Interface | Low-Power FPGA Configuration Latch |
|
Use Scenario: Interfacing FPGA I/O banks to legacy PCI-compliant peripherals operating at 3.3 V with 24 mA load requirements. IC Role / Device Role / Timing Role: Bidirectional bus latch synchronizing data transfers between FPGA fabric and PCI slot, controlled by local LE/OE signals. Use Value: Guaranteed PCI bus compliance at 24 mA ensures signal integrity across full-length backplanes without termination redesign. |
Use Scenario: Holding configuration bits from serial PROM during FPGA startup, where deterministic timing and low static current are critical. IC Role / Device Role / Timing Role: Static latch capturing PROM output on power-up reset, then presenting stable parallel config data to FPGA CONFIG pins. Use Value: 10 µA ICC max reduces total startup current; balanced tPLH/tPHL ensures glitch-free bit alignment across all 8 config lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC573APWR | Same electrical specs; PW package (TSSOP-20) with identical pinout and thermal profile | No functional difference; identical use cases and layout compatibility | Select for TI-sourced supply chain diversification or volume pricing tiers |
| 74LVCH573A | Includes bus-hold circuitry on inputs (no external pull-ups needed); otherwise identical timing and drive | Reduces external BOM count in floating-input designs but increases input capacitance by ~1.5 pF | Prefer where unused D inputs may float; avoid if maximum speed at 3.6 V is critical due to added capacitance |
Compared with SN74LVC573APWR, 74LVC573ATTR offers identical performance and footprint but different logistics traceability; versus 74LVCH573A, it lacks bus-hold but delivers lower input capacitance and tighter skew-making it preferable for high-speed, low-noise bus isolation.
Availability
74LVC573ATTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and FPGA configuration interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for 74LVC573ATTR 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 strong emphasis on reliability and automotive-grade qualification.
The 74LVC series targets low-voltage, high-speed logic interfacing-designed specifically for mixed-voltage system integration in industrial automation, telecom infrastructure, and embedded computing platforms.
FAQ
Can 74LVC573ATTR operate reliably at 1.65 V supply?
Yes. The device is fully specified down to 1.65 V VCC, with guaranteed VIH/VIL thresholds (0.35VCC/0.65VCC), ±4 mA output drive, and 9.4 ns max propagation delay at -55°C to +125°C. Data retention is maintained at 1.2 V, supporting brown-out recovery sequences.
What happens to outputs when VCC = 0 V and OE is asserted?
Outputs remain in high-impedance state due to built-in power-down protection. Inputs also present high impedance, preventing back-current flow from externally driven signals into the unpowered IC-critical for hot-swap and partial-power-down systems.
Is the 74LVC573ATTR pin-compatible with standard 74HC573 devices?
No. While functionally similar, 74LVC573ATTR uses a TSSOP-20 package with 0.65 mm pitch, whereas standard 74HC573 typically uses SOIC-20 (1.27 mm pitch). Pin numbering and functions match, but mechanical layout and soldering profiles differ significantly.
Does this device support hot insertion into a live 5 V bus?
Yes-its 5 V-tolerant inputs and power-down protection allow safe connection to active 5 V buses even when VCC is unpowered. However, OE must be held high (high-Z) during insertion to prevent contention; permanent connection requires proper sequencing per IEC 61000-4-2.
74LVC573ATTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVC
- 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:
- 1.65V ~ 3.6V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 1ns
- Current - Output High, Low:
- 24mA, 24mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVC573ATTR FAQ
1.How can I place an order for 74LVC573ATTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC573ATTR 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 74LVC573ATTR reliable?
The price and inventory of 74LVC573ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC573ATTR is usually 5 days.
3.What payment methods are accepted for 74LVC573ATTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC573ATTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC573ATTR?
74LVC573ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC573ATTR 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 74LVC573ATTR?
For technical support, including 74LVC573ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC573ATTR requirements.
6.How does Aetrix verify that 74LVC573ATTR is sourced from the original manufacturer or authorized distributors?
All 74LVC573ATTR 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 74LVC573ATTR meets industry standards.
7.What is the process for return or replacement of 74LVC573ATTR?
All 74LVC573ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC573ATTR, 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 74LVC573ATTR part is unused and in its original packaging.
Return procedure for 74LVC573ATTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LVC573ATTR Tags
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SN74HC573APWR
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SN74AHC573PWR
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MC74LCX573DTR2G
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74AUP1G373GW,125
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NC7SZ373P6X
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