My Inquiry
My Account
Texas Instruments SN74HCT574PWG4
- Part No.:
- SN74HCT574PWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT574PWG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HCT574PWG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state noninverting outputs, designed for bus interface and data latching in 5V TTL-compatible digital systems. It operates from 4.5V to 5.5V, delivers ±6mA output drive, features 22ns typical propagation delay, and supports bidirectional bus driving in I/O ports and buffer registers.
For engineers reviewing the SN74HCT574PWG4 datasheet, SN74HCT574PWG4 pinout, SN74HCT574PWG4 application, or SN74HCT574PWG4 equivalent, key selection criteria include its 20-pin TSSOP (PW) package, 3-state bus-hold capability, clock-edge-triggered data capture, and compatibility with LSTTL loads without external pull-ups.
Technical Context
This device implements eight independent D-type flip-flops, each capturing data on the low-to-high transition of CLK while maintaining state retention during OE assertion. Its dual output-enable inputs (1OE and 2OE) control two groups of four outputs independently, enabling flexible bus partitioning and multi-drop timing control.
The logic-level inputs are TTL-voltage compatible (VIH = 2V min, VIL = 0.8V max), and the 3-state outputs exhibit high-impedance behavior when OE is high-eliminating bus contention without requiring external interface components. Output drive strength (±6mA at 5V) and low ICC (80μA max) support direct connection to up to 15 LSTTL loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - Ensures stable operation across industrial 5V rail tolerances and noise margins. |
| Propagation Delay (tpd) | 22ns typical at VCC = 5V, CL = 50pF - Enables reliable 24MHz clock operation in synchronous bus systems. |
| Output Drive | ±6mA at VCC = 5V - Directly drives 15 LSTTL loads without buffers or pull-up resistors. |
| Input Compatibility | TTL-voltage level (VIH ≥ 2V, VIL ≤ 0.8V) - Interoperates seamlessly with legacy 74LS and microcontroller GPIOs. |
| Quiescent Current (ICC) | 80μA max - Minimizes static power in always-on register and I/O port applications. |
| 3-State Enable Logic | Active-low OE (1OE/2OE) - Allows independent control of two 4-bit output banks for segmented bus management. |
| Input Leakage Current | 1μA max - Prevents unintended logic transitions on floating or high-impedance control lines. |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 1.2mm max height, lead pitch 0.65mm, exposed thermal pad optional per TI SLMA002/SLMA004 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable inputs | Independently disable upper/lower 4-bit output groups; high = high-Z, low = functional output. |
| CLK | Clock input | Edge-sensitive; data latched on rising edge; synchronizes all eight flip-flops simultaneously. |
| D1–D8 | Data inputs | Eight asynchronous D inputs feeding respective flip-flop stages; TTL-compatible voltage thresholds. |
| Q1–Q8 | 3-state buffered outputs | Noninverting outputs; high-Z when corresponding OE is high; ±6mA drive capability. |
| VCC, GND | Power supply pins | Single 5V supply; requires local 0.1μF bypass capacitor per TI layout recommendations. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Alternating I/O layout minimizes trace crosstalk and simplifies PCB routing for parallel data buses. |
| High-current 3-state outputs | ±6mA drive at 5V enables direct fanout to 15 LSTTL loads-no external bus transceivers required. |
| Low power consumption | 80μA max ICC allows use in power-constrained I/O expanders and battery-backed register files. |
| TTL-input compatibility | VIH = 2V / VIL = 0.8V thresholds ensure interoperability with 74LS, microcontrollers, and FPGA I/O banks. |
| Independent output enables | Dual OE pins (1OE/2OE) permit dynamic segmentation of 8-bit bus into two 4-bit domains for memory-mapped peripherals. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Parallel Interface |
|---|---|
Use Scenario: Adding 8-bit parallel input/output capability to a Cortex-M4-based controller with limited GPIO resources. IC Role / Device Role / Timing Role: Acts as a synchronized input latch and output driver, isolating MCU pins from noisy field-side signals via 3-state control. Use Value: Eliminates need for discrete level shifters or bus buffers; ±6mA drive handles industrial sensor/actuator loads directly. |
Use Scenario: Connecting an 8-bit LCD module with separate read/write strobes to an 8051 derivative MCU. IC Role / Device Role / Timing Role: Provides edge-triggered data capture on WR# pulse and high-Z tri-state during RD# cycles to prevent bus contention. Use Value: Enables clean bidirectional data transfer using single 8-bit data bus-no additional direction-control logic needed. |
| Legacy Bus Interface Adapter | Memory-Mapped Register Bank |
Use Scenario: Bridging a modern ARM SoC's APB bus to legacy ISA-style 8-bit peripheral cards requiring TTL-level handshaking. IC Role / Device Role / Timing Role: Serves as a level-translating, timing-synchronized interface register with OE-controlled bus isolation. Use Value: Matches 5V TTL timing budgets (22ns tpd) and drive strength-avoids signal integrity issues on long backplane traces. |
Use Scenario: Implementing a set of configuration registers in a motor control ASIC where values must be held stable between CPU writes. IC Role / Device Role / Timing Role: Functions as a working register bank; CLK captures new settings, OE disables outputs during reconfiguration. Use Value: Retains prior state during OE assertion-ensures glitch-free updates without disrupting downstream logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374PW | Identical function and pinout; differs only in output-enable polarity (active-high vs. active-low). | Requires inverted OE control logic; unsuitable where existing firmware assumes active-low OE. | Select if system-level OE signal is active-high and board layout permits no-change integration. |
| 74ACT574MTCX | Higher speed (tpd ≈ 9ns), wider VCC range (4.5–5.5V), but higher ICC (2mA typ) and less robust noise immunity. | Better for high-frequency bus arbitration; less suitable for low-power or electrically noisy industrial environments. | Choose when >30MHz operation is required and power budget allows 25× higher quiescent current. |
Compared with SN74HCT574PWG4, SN74HCT374PW offers identical timing and drive but demands OE signal inversion, while 74ACT574MTCX trades significant power efficiency for speed-making SN74HCT574PWG4 optimal for cost-sensitive, noise-resilient 5V bus interfaces.
Availability
SN74HCT574PWG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller parallel interface, and legacy bus adapter designs requiring stable component supply and long-term manufacturability.
Supply support for SN74HCT574PWG4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in industrial-grade digital ICs.
The SN74HCT574PWG4 belongs to TI's HCT logic family-designed specifically for 5V TTL-compatible bus interfacing, offering robust noise immunity, low power, and seamless integration with legacy and mixed-voltage systems.
FAQ
What is the operating voltage range for SN74HCT574PWG4?
The SN74HCT574PWG4 operates from 4.5V to 5.5V. This range ensures compatibility with standard 5V power rails while accommodating typical tolerance and ripple. Operation outside this range may cause unreliable switching or damage, per absolute maximum ratings (–0.5V to 7V). The recommended 4.5–5.5V window guarantees full specification compliance including timing, drive strength, and logic thresholds.
Does SN74HCT574PWG4 support true bidirectional data flow?
SN74HCT574PWG4 does not support true bidirectional data flow on individual pins-it is an octal D-type flip-flop with unidirectional data paths (D→Q) and separate 3-state outputs. However, it enables bidirectional bus operation when paired with complementary devices (e.g., SN74HCT245) or used in master/slave configurations where OE controls directionality via system-level protocol. Its dual OE inputs facilitate time-multiplexed read/write cycles on shared data lines.
What is the maximum clock frequency supported by SN74HCT574PWG4?
SN74HCT574PWG4 supports up to 24MHz maximum clock frequency at VCC = 5.5V and TA = 25°C with CL = 50pF. At 4.5V, fmax drops to 20MHz. These values assume proper load conditions and layout; real-world performance depends on PCB trace capacitance and termination. For CL = 150pF, fmax reduces further-to 22MHz (5.5V) and 20MHz (4.5V)-due to increased switching load.
How does the 3-state output functionality work on SN74HCT574PWG4?
SN74HCT574PWG4 uses two active-low output-enable inputs (1OE and 2OE) to place its eight Q outputs into high-impedance (high-Z) state. When either OE is high, the corresponding four outputs disconnect electrically from the bus-neither sourcing nor sinking current. This prevents bus contention during data transfers or idle periods. OE has no effect on internal flip-flop operation: data continues to be latched on CLK edges regardless of OE state.
Is SN74HCT574PWG4 RoHS compliant and what is its moisture sensitivity level?
Yes, SN74HCT574PWG4 is RoHS compliant (lead-free, halogen-free) and rated MSL Level-1 at 260°C peak reflow per JEDEC J-STD-020. This means it can be stored indefinitely at ambient conditions without baking prior to assembly. The TSSOP-20 (PW) package uses NiPdAu lead finish and is supplied in tape-and-reel format (2000 units/reel), with part marking "HT574" visible on the top surface.
SN74HCT574PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 47ns @ 5.5V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HCT574PWG4 FAQ
1.How can I place an order for SN74HCT574PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT574PWG4 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 SN74HCT574PWG4 reliable?
The price and inventory of SN74HCT574PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT574PWG4 is usually 5 days.
3.What payment methods are accepted for SN74HCT574PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT574PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT574PWG4?
SN74HCT574PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT574PWG4 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 SN74HCT574PWG4?
For technical support, including SN74HCT574PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT574PWG4 requirements.
6.How does Aetrix verify that SN74HCT574PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT574PWG4 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 SN74HCT574PWG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT574PWG4?
All SN74HCT574PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT574PWG4, 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 SN74HCT574PWG4 part is unused and in its original packaging.
Return procedure for SN74HCT574PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HCT574PWG4 Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
