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STMicroelectronics 74LCX573MTR
- Part No.:
- 74LCX573MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCX573MTR.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,055
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Product details
Overview
74LCX573MTR from STMicroelectronics is an octal non-inverting D-type transparent latch with 3-state outputs, 5V-tolerant I/O, and operation down to 2.0V VCC. It features 8.0 ns max propagation delay at 3V, ±24 mA output drive, symmetrical output impedance, and latch-enable/output-enable control logic. Used in 3.3V bus interface and level-shifting applications between 3.3V and 5V domains.
For engineers reviewing the 74LCX573MTR datasheet, 74LCX573MTR pinout, 74LCX573MTR application, or 74LCX573MTR equivalent, key selection criteria include 5V-tolerant input/output capability, 3-state output timing (tPZL/tPHZ ≤ 8.5 ns), latch enable setup/hold times (tS = 2.5 ns, th = 1.5 ns), and SO-20 package compatibility with legacy 74-series footprint.
Technical Context
The 74LCX573 implements a parallel 8-bit transparent latch with independent LE (latch enable) and OE (output enable) controls. Its dual-control architecture allows data capture on LE low-to-high edge and output gating via active-low OE - enabling bus sharing and dynamic tri-state management in multi-master systems.
Designed for mixed-voltage environments, it guarantees PCI bus-level signaling at 24 mA drive strength while maintaining full 5V tolerance on all I/O pins across 2.0–3.6V VCC operation. Input leakage is limited to ±5 µA, and power-down protection ensures safe high-impedance behavior during VCC = 0V conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 3.6 V - supports 3.3V systems with 1.5V data retention during sleep |
| tPD (D→Q) | 8.0 ns max at VCC = 3.0–3.6V - matches AC/ACT speed at half the voltage |
| IOL / IOH | ±24 mA min at VCC = 3.0–3.6V - drives standard PCI loads without external buffers |
| VI / VO Tolerance | 0 to 5.5 V - enables direct interfacing with 5V logic without level shifters |
| tPLH ≅ tPHL | Matched rise/fall delays - minimizes skew-sensitive timing violations in parallel buses |
| CIN / COUT | 6 pF / 12 pF - low capacitive loading preserves signal integrity on high-speed traces |
| ESD Rating | HBM > 2000 V - withstands handling and board assembly without additional protection |
Pinout & Package
74LCX573MTR is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-013, with 1.27 mm pitch and 12.6–13.0 mm body width. Pin 1 marked by notch or dot; pin 10 = GND, pin 20 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - disables all Q outputs to high-Z when high |
| 2–9 | D0–D7 | Data inputs - sampled on LE high; latched on LE falling edge |
| 11 | LE | Latch enable - transparent mode when high; holds Q state when low |
| 12–19 | Q0–Q7 | Non-inverting 3-state outputs - reflect D inputs when LE high and OE low |
| 10 | GND | Ground reference - must be connected before VCC for ESD-safe power sequencing |
| 20 | VCC | Positive supply - powers internal logic and output drivers; tolerant of 0–7V transient |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Full 0–5.5V input/output voltage range - eliminates level translators in mixed-voltage backplanes |
| Symmetrical output drive | |IOH| = IOL = 24 mA min - ensures matched rise/fall times and clean bus termination |
| Power-down protection | Inputs/outputs remain high-Z and non-destructive at VCC = 0V - prevents back-driving |
| Latch + output enable separation | Independent LE and OE controls - enables pipelined data capture and dynamic bus arbitration |
| Low ICC quiescent current | 10 µA max at VCC = 3.6V - reduces standby power in battery-backed or always-on modules |
Applications
| PCI Bus Interface | 3.3V/5V Level Translation |
|---|---|
|
Use Scenario: Interfacing 3.3V microcontroller peripherals to legacy 5V PCI slots in industrial control backplanes. IC Role / Device Role / Timing Role: Octal latch buffers address/data lines with simultaneous 5V-tolerant sampling and 3-state bus release. Use Value: Eliminates discrete level shifters while meeting PCI timing specs (tPLH/tPHL ≤ 8.5 ns) and 24 mA drive requirements. |
Use Scenario: Bidirectional voltage translation between 3.3V FPGA I/O banks and 5V sensor modules in test equipment. IC Role / Device Role / Timing Role: Non-inverting latch with independent OE provides direction-controlled, glitch-free level shifting. Use Value: Supports hot-swap-safe 5V-tolerant inputs and outputs without external pull-ups or direction control logic. |
| Memory Address Latching | Industrial PLC I/O Expansion |
|
Use Scenario: Latching 8-bit address segments from a 3.3V ARM processor to access external SRAM or flash in embedded systems. IC Role / Device Role / Timing Role: Transparent latch captures address bits on LE edge; OE synchronizes with memory read/write strobes. Use Value: Enables reliable address hold with 2.5 ns setup/1.5 ns hold time margin against fast CPU clock edges. |
Use Scenario: Isolating and buffering digital I/O signals between 3.3V controller logic and 5V-rated relay driver stages in factory automation. IC Role / Device Role / Timing Role: 3-state latch decouples noisy output stages from sensitive MCU pins during fault conditions. Use Value: High-impedance disable (OE high) prevents latch-up during overcurrent events and supports modular I/O hot-swap. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC573APW | Lower VCC min (1.65V), but only 3.6V I/O tolerance - no 5V input support | Requires external clamping for 5V inputs; unsuitable for direct PCI bus connection | Select when system operates strictly at 1.8V/2.5V/3.3V and 5V tolerance is unnecessary |
| SN74LVCH16373A | 16-bit, dual-supply (VCCA=1.65–3.6V, VCCB=2.3–3.6V), no 5V tolerance | Supports wider voltage translation (e.g., 1.8V ↔ 3.3V), but not 3.3V ↔ 5V | Choose for high-density, dual-voltage I/O expansion where 5V compatibility is absent |
Compared with 74LVC573APW and SN74LVCH16373A, the 74LCX573MTR uniquely delivers true 5V-tolerant I/O at 3.3V VCC - making it the only option among the three for direct integration into mixed 3.3V/5V bus architectures without redesign.
Availability
74LCX573MTR is available at Aetrix Electronics and suitable for PCI bus interface, 3.3V/5V level translation, and memory address latching requiring stable component supply and long-term industrial availability.
Supply support for 74LCX573MTR 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, Switzerland, specializing in automotive, industrial, and power management ICs with broad analog, digital, and mixed-signal portfolios.
The 74LCX family was engineered for low-voltage, high-speed 3.3V logic interoperability with legacy 5V systems - targeting cost-sensitive, space-constrained industrial and telecom infrastructure designs.
FAQ
Can 74LCX573MTR operate with VCC = 2.5V while accepting 5V inputs?
Yes. The device is fully specified for 5V-tolerant inputs across its entire recommended operating range (2.0–3.6V VCC). At VCC = 2.5V, VIH remains 2.0V and VIL stays 0.8V, ensuring robust noise margins even with 5V signals applied directly to D or OE/LE pins.
What happens to outputs when VCC = 0V and OE is low?
Outputs enter high-impedance state with power-down protection activated. Input and output structures are internally isolated from VCC, preventing back-current flow and protecting downstream circuitry - confirmed by Ioff ≤ 10 µA at VI/VO = 5.5V and VCC = 0V.
Is the 74LCX573MTR pin-compatible with standard 74HC573?
Yes - it uses identical SO-20 pinout and logic function mapping (D0–D7, Q0–Q7, LE, OE, GND, VCC). However, 74LCX573MTR replaces 74HC573's 5V-only operation with 2.0–3.6V VCC and 5V-tolerant I/O, enabling drop-in replacement in upgraded 3.3V systems.
Does the device meet JESD17 latch-up immunity requirements?
Yes - latch-up performance exceeds 500 mA per JESD17 testing methodology. This rating applies across the full operating temperature range (–55°C to +125°C), validating suitability for harsh industrial and automotive under-hood environments.
74LCX573MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 2V ~ 3.6V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 1.5ns
- Current - Output High, Low:
- 24mA, 24mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74LCX573MTR FAQ
1.How can I place an order for 74LCX573MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX573MTR 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 74LCX573MTR reliable?
The price and inventory of 74LCX573MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX573MTR is usually 5 days.
3.What payment methods are accepted for 74LCX573MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX573MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX573MTR?
74LCX573MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX573MTR 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 74LCX573MTR?
For technical support, including 74LCX573MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX573MTR requirements.
6.How does Aetrix verify that 74LCX573MTR is sourced from the original manufacturer or authorized distributors?
All 74LCX573MTR 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 74LCX573MTR meets industry standards.
7.What is the process for return or replacement of 74LCX573MTR?
All 74LCX573MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX573MTR, 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 74LCX573MTR part is unused and in its original packaging.
Return procedure for 74LCX573MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LCX573MTR Tags
-
SN74HC573APWR
Texas Instruments
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SN74HC573ADWR
Texas Instruments
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SN74AHC573PWR
Texas Instruments
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SN74HCT573DWR
Texas Instruments
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SN74HC373N
Texas Instruments
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SN74HC573AN
Texas Instruments
-
74VHC573MTCX
onsemi
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MC74LCX573DTR2G
onsemi
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74AUP1G373GW,125
Nexperia USA Inc.
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SN74LVC1G373DCKR
Texas Instruments
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SN74LVC1G373DBVR
Texas Instruments
-
NC7SZ373P6X
onsemi
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