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STMicroelectronics M74HCT573RM13TR
- Part No.:
- M74HCT573RM13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Latches
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
M74HCT573RM13TR.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,439
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Product details
Overview
M74HCT573RM13TR from STMicroelectronics is an octal D-type transparent latch with 3-state non-inverting outputs, designed for bus-oriented TTL-compatible digital systems. It features 21 ns typical propagation delay at 4.5 V, ±6 mA output drive, and operates across –55°C to +125°C. Used in microcontroller address/data latching and memory interfacing where bidirectional bus isolation is required.
For engineers reviewing the M74HCT573RM13TR datasheet, M74HCT573RM13TR pinout, M74HCT573RM13TR application, or M74HCT573RM13TR equivalent, key selection criteria include latch enable timing (7 ns min pulse width), 3-state output disable time (18 ns), input compatibility with TTL logic levels (VIH ≥ 2.0 V), and TSSOP-20 package thermal performance in high-density PCB layouts.
Technical Context
The M74HCT573RM13TR implements a silicon gate C2MOS architecture enabling direct interface between HCMOS, TTL, and NMOS logic families. Its dual-control inputs-Latch Enable (LE) and Output Enable (OE)-support independent data capture and bus release timing.
It delivers symmetrical output impedance (|IOH| = IOL = 6 mA min), balanced tPLH/tPHL propagation delays (~21 ns typ), and low quiescent current (ICC ≤ 4 µA at 25°C), making it suitable for low-power industrial control and automotive body electronics where signal integrity and static immunity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Ensures stable operation under standard 5 V rail with ±10% tolerance. |
| Propagation Delay (LE→Q) | 21 ns (typ) at VCC=4.5 V, CL=50 pF - Enables reliable 24 MHz bus clocking with timing margin. |
| Output Drive Strength | ±6 mA (min) - Sustains logic levels driving up to 10 LS-TTL loads without external buffering. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Guarantees robust noise immunity and direct connection to TTL outputs. |
| Quiescent Current | 4 µA (max) at TA=25°C - Supports ultra-low standby power in battery-backed systems. |
| Operating Temperature | –55°C to +125°C - Qualified for under-hood automotive and industrial motor control environments. |
| 3-State Disable Time | 18 ns (max) at VCC=4.5 V - Minimizes bus contention during rapid output release cycles. |
Pinout & Package
TSSOP-20 package: 6.5 mm × 4.4 mm × 1.05 mm body, 0.65 mm pitch, lead-free, moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state output enable | Drives all Q outputs to high-impedance when high; enables normal logic states when low. |
| 2–9 (D0–D7) | Data inputs | Transparently passed to Q outputs when LE is high; latched on LE falling edge. |
| 11 (LE) | Latch enable | High enables transparency; low captures and holds D-input state at Q outputs. |
| 12–19 (Q0–Q7) | 3-state non-inverting outputs | Reflect latched D values when OE low; tri-stated when OE high for bus sharing. |
| 10 (GND) | Ground reference | Return path for all internal logic and output currents; must be low-inductance connection. |
| 20 (VCC) | Positive supply | Primary power rail; requires local 100 nF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS573 | Direct drop-in replacement for legacy TTL latches without redesigning PCB layout or firmware. |
| Balanced tPLH/tPHL delays | Minimizes skew between rising/falling edges, improving setup/hold timing margins in synchronous buses. |
| Symmetrical output drive (±6 mA) | Ensures consistent rise/fall times and noise margin across logic transitions, reducing EMI. |
| ESD protection on all inputs | Withstands ±2 kV HBM per IEC 61000-4-2, eliminating need for external transient suppressors in assembly. |
| Wide temperature range (–55°C to +125°C) | Validated for use in engine control units, industrial PLC I/O modules, and railway signaling hardware. |
Applications
| Microcontroller Bus Interface | Memory Address Latching |
|---|---|
Use Scenario: Isolating multiplexed AD0–AD7 lines from an 8-bit MCU during external RAM access cycles. IC Role / Device Role / Timing Role: Transparent latch capturing address bits on LE falling edge; OE synchronized to memory read/write strobes. Use Value: Eliminates need for separate address demultiplexing logic while maintaining <10 ns timing uncertainty between latch and memory enable. | Use Scenario: Holding 8-bit segment addresses in a segmented memory architecture with shared data/address bus. IC Role / Device Role / Timing Role: Non-inverting latch storing upper address byte during instruction fetch, released only during valid memory cycle. Use Value: Reduces address decode latency by 12 ns versus software-based bit-banging, increasing effective memory bandwidth by 8%. |
| Industrial I/O Expansion | Automotive Body Control Module |
Use Scenario: Buffering parallel GPIO outputs from a programmable logic controller to drive relay banks and LED indicators. IC Role / Device Role / Timing Role: 3-state latch isolating PLC outputs from noisy 24 V DC field wiring; OE controlled by watchdog timer. Use Value: Prevents spurious actuation during reset or firmware update via hardware-enforced output disable (tPLZ = 18 ns). | Use Scenario: Managing door lock actuator signals in a centralized body controller with shared CAN/LIN communication bus. IC Role / Device Role / Timing Role: Latching lock/unlock commands from microcontroller before applying to driver ICs; LE tied to safety-critical enable signal. Use Value: Provides fail-safe hold functionality during voltage dip events (operates down to 4.5 V), meeting ISO 7637-2 Pulse 4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT573PW | TSSOP-20, identical AC/DC specs, TI's characterization includes 125°C life test data not published for M74HCT573. | Approved for extended-temperature automotive AEC-Q100 Grade 2 (–40°C to +105°C); M74HCT573RM13TR rated to +125°C but not AEC-Q100 certified. | Select SN74HCT573PW for production requiring AEC-Q100 qualification; retain M74HCT573RM13TR for cost-sensitive industrial designs needing full –55°C support. |
| 74VHC573FT | Higher VCC range (2–5.5 V), lower ICC (≤1 µA), but reduced drive (±8 mA) and slower tPD (25 ns typ at 5 V). | Optimized for mixed-voltage 3.3 V/5 V systems; lacks guaranteed operation below –40°C. | Choose 74VHC573FT only if operating at 3.3 V or requiring sub-µA standby; avoid where –55°C operation or 21 ns timing is mandatory. |
Compared with SN74HCT573PW and 74VHC573FT, the M74HCT573RM13TR uniquely combines –55°C capability, 21 ns speed, and 5 V TTL compatibility in a space-constrained TSSOP-20, making it optimal for ruggedized embedded controllers where extended cold-start performance is non-negotiable.
Availability
M74HCT573RM13TR is available at Aetrix Electronics and suitable for microcontroller bus interfaces, memory address latching, industrial I/O expansion, and automotive body control modules requiring stable component supply across long product lifecycles.
Supply support for M74HCT573RM13TR 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 vertical manufacturing and broad IP portfolio.
The M74HCT573 belongs to ST's high-speed CMOS logic family, engineered for seamless interoperability between legacy TTL systems and modern low-power embedded controllers in harsh-environment applications.
FAQ
What is the minimum latch enable pulse width required for reliable operation?
The M74HCT573RM13TR requires a minimum LE pulse width of 7 ns at VCC = 4.5 V and TA = 25°C, increasing to 22 ns over the full –55°C to +125°C range. This ensures sufficient time for internal metastability resolution and guarantees deterministic latching of D-input values without glitches.
Can OE and LE be tied together for simplified control?
No - OE and LE serve distinct functions and must be controlled independently. Tying them together prevents simultaneous latching and 3-state control, causing bus contention or unintended data corruption. OE manages output impedance; LE controls data capture timing; their separation enables precise bus arbitration in multi-master systems.
Does this device support hot insertion or live bus swapping?
No - the M74HCT573RM13TR lacks hot-swap protection circuitry such as power-up 3-state or undervoltage lockout. Applying VCC while OE or LE are active may cause output contention or excessive current draw. Power sequencing must follow VCC first, then control signals, with OE held high until power stabilizes.
What is the maximum capacitive load the outputs can drive reliably?
The outputs are characterized up to 150 pF (per AC specs), with tPLH/tPHL increasing from 21 ns to 49 ns at that load. For reliable 24 MHz operation with <1 ns skew, total net capacitance-including PCB trace, connector, and downstream inputs-must remain ≤50 pF, requiring careful layout and minimal stub lengths.
M74HCT573RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HCT
- 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:
- 4.5V ~ 5.5V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 19ns
- Current - Output High, Low:
- 6mA, 6mA
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
M74HCT573RM13TR FAQ
1.How can I place an order for M74HCT573RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HCT573RM13TR 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 M74HCT573RM13TR reliable?
The price and inventory of M74HCT573RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HCT573RM13TR is usually 5 days.
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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 M74HCT573RM13TR?
For technical support, including M74HCT573RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HCT573RM13TR requirements.
6.How does Aetrix verify that M74HCT573RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HCT573RM13TR 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 M74HCT573RM13TR meets industry standards.
7.What is the process for return or replacement of M74HCT573RM13TR?
All M74HCT573RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT573RM13TR, 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 M74HCT573RM13TR part is unused and in its original packaging.
Return procedure for M74HCT573RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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