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STMicroelectronics M74HCT574TTR
- Part No.:
- M74HCT574TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M74HCT574TTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,808
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Product details
Overview
M74HCT574TTR from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with 3-state non-inverting outputs, designed for data latching and bus interface control in digital systems. It operates at up to 50 MHz (typ.) at VCC = 4.5 V, features symmetrical output drive (±6 mA), TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and supports industrial temperature range (–55 °C to +125 °C) in TSSOP-20 package.
For engineers reviewing the M74HCT574TTR datasheet, M74HCT574TTR pinout, M74HCT574TTR application, or M74HCT574TTR equivalent, key selection criteria include clock-edge-triggered 8-bit data capture, independent 3-state output enable (active-low OE), propagation delay matching (tPLH ≅ tPHL), and low quiescent current (ICC ≤ 4 µA at TA = 25 °C).
Technical Context
The M74HCT574TTR implements eight edge-triggered D-type flip-flops synchronized to the rising edge of CK, with asynchronous 3-state output control via OE. Its internal logic retains stored data regardless of OE state, enabling transparent data staging during bus arbitration.
Designed using sub-micron silicon gate C2MOS technology, it delivers balanced AC performance: tPLH/tPHL = 20–45 ns (CL = 50 pF), tPZL/tPLZ = 19–45 ns, and fMAX = 50 MHz (typ.) at VCC = 4.5 V - all while maintaining TTL-level input thresholds and CMOS-level output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V digital rails and noise margin stability |
| fMAX | 50 MHz (typ.) at VCC = 4.5 V - supports high-throughput data capture in synchronous bus interfaces |
| tPLH / tPHL | 20–45 ns (CL = 50 pF) - enables precise timing alignment between parallel data paths |
| IOL / IOH | ±6 mA (min.) - drives standard TTL loads and multiple CMOS inputs without buffering |
| ICC (Quiescent) | 4 µA (max.) at TA = 25 °C - minimizes standby power in battery-backed or low-power hold modes |
| Operating Temp | –55 °C to +125 °C - qualified for automotive under-hood, industrial motor control, and aerospace avionics |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees reliable interfacing with legacy TTL outputs and mixed-voltage systems |
Pinout & Package
TSSOP-20 (Thin Shrink Small Outline Package), 0.65 mm pitch, 6.4 × 6.6 × 1.05 mm body height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - decouples outputs from bus without affecting internal latch state |
| 2–9 | D0–D7 | Asynchronous data inputs - sampled on rising CK edge and held until next clock |
| 11 | CK | Positive-edge-triggered clock - controls synchronous capture timing across all 8 bits |
| 10 | GND | Reference ground - shared return path for logic and output current |
| 20 | VCC | Positive supply - powers internal logic and output drivers; bypassing required per layout guidelines |
| 12–19 | Q7–Q0 | Non-inverting 3-state outputs - present latched data or high-impedance when OE = HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Rising-edge clock trigger | Ensures deterministic sampling of D inputs with minimal setup/hold time (ts = 7 ns min., th = 0 ns) |
| Independent OE control | Allows concurrent data latching and bus release - critical for multi-master arbitration |
| Symmetrical output drive | IOH = IOL = 6 mA (min.) - eliminates skew in bidirectional bus pull-up/pull-down scenarios |
| Wide temperature operation | –55 °C to +125 °C - validated for extended thermal cycling in harsh environments |
| ESD protection | Integrated input/output diode clamps - withstands ±20 mA transient current per pin |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status and actuator commands across isolated CAN/LIN gateway interfaces. IC Role / Device Role / Timing Role: Octal data register synchronizing microcontroller GPIO writes to external relay drivers and LED arrays. Use Value: Enables deterministic 8-bit parallel handshaking with 20 ns propagation delay matching, reducing inter-channel skew in real-time control loops. | Use Scenario: Buffering door lock, window lift, and mirror position signals between MCU and power driver ICs. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation register for 5 V tolerant signal routing in 12 V vehicle electrical architecture. Use Value: TTL-compatible inputs accept direct connection to legacy MCU GPIO; 3-state outputs prevent contention during sleep/wake transitions. |
| Test Equipment Digital Pattern Generator | Medical Diagnostic Imaging Interface |
Use Scenario: Generating synchronized stimulus waveforms for ASIC validation and FPGA bitstream testing. IC Role / Device Role / Timing Role: High-speed parallel data latch feeding 8-bit DACs or comparator arrays under programmable clock control. Use Value: 50 MHz max clock frequency and matched tPLH/tPHL support sub-20 ns timing resolution in automated test pattern generation. | Use Scenario: Isolating and latching X-ray detector pixel readout data before ADC conversion and frame buffering. IC Role / Device Role / Timing Role: Radiation-tolerant data staging register interfacing between analog front-end and digital processing subsystem. Use Value: –55 °C to +125 °C rating supports operation near high-power imaging components; low ICC reduces thermal load in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT574PW | Same logic function, identical AC/DC specs, but in TSSOP-20 with different mechanical dimensions (JEDEC MO-153 vs ST's c E b A2 A E1 D footprint) | Requires PCB land pattern revision; no change in timing or drive capability | Preferred for TI-sourced BOMs or where dual-sourcing across foundries is required |
| 74VHC574FT | Higher speed (fMAX = 110 MHz), lower ICC (1 µA), but reduced drive strength (IOL = 8 mA typ., not min.) and narrower VCC range (2–5.5 V) | Better for ultra-low-power portable diagnostics; less suitable for noisy 5 V industrial buses | Select when system-level power budget is <10 µA per register and clock rates exceed 60 MHz |
Compared with SN74HCT574PW and 74VHC574FT, the M74HCT574TTR offers optimal balance of industrial temperature resilience, proven bus-drive robustness, and drop-in compatibility with legacy 74-series layouts - making it preferred for long-lifecycle embedded control designs.
Availability
M74HCT574TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment digital pattern generation, and medical diagnostic imaging interfaces requiring stable component supply over extended production lifecycles.
Supply support for M74HCT574TTR 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 capabilities.
The M74HCT574TTR belongs to ST's HCT logic family - engineered for TTL-to-CMOS bridging in noise-immune, wide-temperature industrial control systems where reliability and pin compatibility outweigh ultra-high-speed requirements.
FAQ
What is the maximum clock frequency supported by M74HCT574TTR?
The M74HCT574TTR supports a maximum clock frequency of 50 MHz (typical) at VCC = 4.5 V with CL = 50 pF. Measured values range from 25 MHz (min. over –55 °C to +125 °C) to 50 MHz (typ. at 25 °C). This is verified under standard AC test conditions per STMicroelectronics' datasheet Rev. 11, page 5.
Does M74HCT574TTR support hot insertion or live bus swapping?
No - M74HCT574TTR does not include hot-swap protection circuitry. While its 3-state outputs isolate the bus when OE is HIGH, the device lacks built-in current limiting or slew-rate control for safe insertion into powered backplanes. External series resistors or dedicated hot-swap controllers are required for such use cases.
Can OE be toggled asynchronously while CK is active?
Yes - OE operates independently of CK. The internal flip-flop states remain unchanged regardless of OE state; only output drivers are enabled or placed in high-impedance. This allows dynamic bus arbitration without disrupting latched data, as confirmed in the truth table (page 2) and functional description (page 1).
Is M74HCT574TTR pin-compatible with standard 74LS574?
Yes - M74HCT574TTR is pin- and function-compatible with 74LS574 and other 74-series octal D-type flip-flops. Pin assignments (D0–D7, Q0–Q7, CK, OE, VCC, GND) match exactly, and logic behavior (rising-edge capture, active-low OE) is identical. However, voltage thresholds and drive strength differ per technology.
M74HCT574TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 36ns @ 4.5V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
M74HCT574TTR FAQ
1.How can I place an order for M74HCT574TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HCT574TTR 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 M74HCT574TTR reliable?
The price and inventory of M74HCT574TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HCT574TTR is usually 5 days.
3.What payment methods are accepted for M74HCT574TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HCT574TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HCT574TTR?
M74HCT574TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HCT574TTR 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 M74HCT574TTR?
For technical support, including M74HCT574TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HCT574TTR requirements.
6.How does Aetrix verify that M74HCT574TTR is sourced from the original manufacturer or authorized distributors?
All M74HCT574TTR 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 M74HCT574TTR meets industry standards.
7.What is the process for return or replacement of M74HCT574TTR?
All M74HCT574TTR units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT574TTR, 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 M74HCT574TTR part is unused and in its original packaging.
Return procedure for M74HCT574TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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