My Inquiry
My Account
Texas Instruments SN74HC574PWRG4
- Part No.:
- SN74HC574PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC574PWRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC574PWRG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state noninverting outputs, designed for bus interface applications. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 22 ns (VCC = 4.5 V, CL = 50 pF), and draws ≤80 µA ICC, making it suitable for I/O port buffering and bidirectional data bus control in industrial microcontroller systems.
For engineers reviewing the SN74HC574PWRG4 datasheet, SN74HC574PWRG4 pinout, SN74HC574PWRG4 application, or SN74HC574PWRG4 equivalent, key selection criteria include its TSSOP-20 package, 3-state bus-hold capability, clock-edge-triggered register behavior, and compatibility with LSTTL load driving (up to 15 units) without external pull-ups.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with a dedicated active-low output-enable (OE) controlling all eight outputs simultaneously. Its 3-state outputs decouple registered data from the bus when OE is high, enabling time-multiplexed sharing of data lines across multiple peripherals.
The logic family uses silicon-gate CMOS technology, ensuring low static power consumption and high noise immunity. Input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), and all inputs tolerate slow transitions per TI's SCBA004 guidance-unused inputs must be tied to VCC or GND to prevent floating-induced instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - supports direct interfacing with 3.3 V and 5 V logic domains without level shifters. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads, eliminating need for buffer ICs on shared buses. |
| Propagation Delay | 22 ns typical (CLK to Q, VCC = 4.5 V, CL = 50 pF) - enables reliable operation up to 24 MHz clock frequency in synchronous bus systems. |
| Quiescent Current | 80 µA max - ensures minimal standby power in battery-backed or energy-constrained embedded controllers. |
| Input Leakage | 1 µA max - prevents unintended logic state shifts due to leakage accumulation on high-impedance nodes. |
| Setup/Hold Time | 25 ns setup / 5 ns hold (VCC = 4.5 V) - defines minimum data stability window before and after CLK rising edge for reliable capture. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade deployment in programmable logic controllers and motor drives. |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 4.40 mm body, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock input | Rising-edge sensitive; triggers simultaneous latching of all eight D inputs into respective Q outputs. |
| 2–9 (D1–D8) | Data inputs | Asynchronous inputs sampled only on CLK↑; no internal synchronization-external timing margins must be met. |
| 10 (GND) | Ground reference | Common return path for all signals and power; requires low-inductance connection to minimize ground bounce. |
| 11–18 (Q1–Q8) | 3-state outputs | Driven high/low when OE is low; enter high-Z when OE is high-enables bus arbitration without contention. |
| 19 (OE) | Output enable | Active-low control; asynchronous assertion/deassertion allows dynamic bus release without affecting internal register state. |
| 20 (VCC) | Power supply | Must be bypassed with 0.1 µF ceramic capacitor placed within 3 mm of pin to suppress switching noise and ensure stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Adjacent D and Q pins (e.g., D1/Q1 on pins 2/11) simplify PCB routing for byte-wide data paths and reduce trace length mismatch. |
| High-current 3-state outputs | ±6 mA drive at 5 V enables direct connection to legacy TTL buses without series resistors or external drivers. |
| Low input current | ≤1 µA max eliminates loading concerns on upstream logic gates or microcontroller GPIOs driving D or CLK. |
| Wide voltage operation | 2–6 V range permits use in mixed-voltage systems (e.g., 3.3 V MCU core with 5 V peripheral bus) without translation circuitry. |
| Edge-triggered register behavior | Rising-edge sampling provides deterministic timing alignment for synchronous data capture in control and communication interfaces. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Parallel Bus Interface |
|---|---|
Use Scenario: Adding 8-bit parallel digital input/output capability to a PLC main controller via backplane or ribbon cable. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer-holds actuator states during scan cycle and captures sensor data on clock edge. Use Value: Enables deterministic, jitter-free I/O update synchronized to PLC scan clock; 3-state outputs prevent bus contention during configuration or fault recovery. |
Use Scenario: Interfacing an 8-bit microcontroller (e.g., PIC18F or STM32 GPIO bank) to external memory or peripheral chips using multiplexed address/data bus. IC Role / Device Role / Timing Role: Serves as data bus transceiver-latches outgoing data during write cycles and presents incoming data during read cycles under OE control. Use Value: Eliminates need for discrete bus buffers; ±6 mA drive ensures signal integrity across 10+ cm traces at 24 MHz bus rates. |
| Legacy System Bus Isolation | Test Equipment Digital Pattern Generator |
Use Scenario: Isolating a modern FPGA-based subsystem from an aging 5 V TTL bus while preserving timing compatibility. IC Role / Device Role / Timing Role: Functions as voltage-tolerant bus register-accepts 5 V inputs, latches on FPGA clock, and drives 5 V outputs only when enabled. Use Value: Bridges voltage domains without level shifters; 2 V–6 V supply range allows direct 5 V operation while maintaining CMOS noise margins. |
Use Scenario: Generating repeatable 8-bit digital stimulus patterns for DUT testing in automated test equipment (ATE). IC Role / Device Role / Timing Role: Stores pattern words from controller RAM and outputs them synchronously on each CLK pulse under precise OE gating. Use Value: Provides glitch-free pattern edges with <22 ns tpd; 3-state outputs allow seamless switching between pattern sources without bus contention. |
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 |
|---|---|---|---|
| SN74HCT574PWR | TTL-compatible input thresholds (VIH = 2 V min), otherwise identical pinout, timing, and drive strength. | Better suited for mixed 5 V TTL/CMOS systems where input noise margin must match legacy TTL levels. | Select when interfacing directly with 5 V TTL outputs; retains same PCB layout and firmware timing. |
| 74LCX574MTCX | Lower VCC range (2.0–3.6 V), higher speed (tPD = 5.5 ns @ 3.3 V), but reduced drive (±24 mA) and no 5 V tolerance. | Optimized for 3.3 V-only portable or low-power systems; incompatible with 5 V buses or mixed-supply designs. | Choose only for new 3.3 V designs requiring sub-10 ns latency; requires redesign for voltage and layout. |
Compared with SN74HCT574PWR, SN74HC574PWRG4 offers superior noise immunity in pure CMOS environments but lacks TTL input compatibility; versus 74LCX574MTCX, it trades speed for universal 2–6 V operation and robust 5 V bus driving-making it the preferred choice for industrial retrofit and mixed-voltage applications.
Availability
SN74HC574PWRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller parallel bus interfacing, and legacy system bus isolation requiring stable component supply and long-term lifecycle support.
Supply support for SN74HC574PWRG4 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 and automotive electronics.
The SN74HC574 belongs to TI's industry-standard HC logic family, engineered for robust bus-interface functionality in noise-prone industrial control and instrumentation applications where reliability and wide supply tolerance are critical.
FAQ
What is the maximum clock frequency supported by SN74HC574PWRG4?
The SN74HC574PWRG4 supports up to 24 MHz at VCC = 4.5 V and TA = 25 °C (CL = 50 pF). At 6 V, fmax reaches 28 MHz under same conditions. Real-world operation depends on board layout, load capacitance, and temperature-designers should verify timing margins using the 25 ns setup/5 ns hold window and measured tpd values.
Does SN74HC574PWRG4 require external pull-up or pull-down resistors on its inputs?
No. SN74HC574PWRG4 has CMOS inputs with negligible leakage (≤1 µA), so unused inputs must be tied to VCC or GND-not left floating-to prevent oscillation or excessive current draw. Pull-up/down resistors are unnecessary unless required by system-level noise immunity requirements beyond the device's inherent 40% VCC noise margin.
Can SN74HC574PWRG4 drive a 5 V bus while powered from 3.3 V?
No. SN74HC574PWRG4 is not 5 V-tolerant on inputs or outputs when VCC = 3.3 V. Its absolute maximum VCC is 6 V, but output high voltage (VOH) scales with VCC-driving a true 5 V bus requires VCC = 5 V. For mixed-voltage interfacing, use SN74HCT574PWR (TTL-input compatible) or add discrete level-shifting circuitry.
What is the thermal resistance (RθJA) of SN74HC574PWRG4 in its TSSOP-20 package?
The junction-to-ambient thermal resistance RθJA for SN74HC574PWRG4 (TSSOP-20, PW package) is 131.8 °C/W, per TI's SCLS148H datasheet revision H. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves significantly with copper pour and thermal vias under the exposed pad (if present) or adjacent ground planes.
How does the output-enable (OE) function interact with internal register state in SN74HC574PWRG4?
In SN74HC574PWRG4, OE is purely output-oriented and asynchronous-it has no effect on internal flip-flop operation. Data continues to be latched on every CLK↑ regardless of OE state. When OE is high, outputs go high-impedance; when OE is low, the last-latched Q values appear on outputs. This allows seamless bus arbitration without disrupting ongoing register updates.
SN74HC574PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 31ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- 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
SN74HC574PWRG4 FAQ
1.How can I place an order for SN74HC574PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574PWRG4 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 SN74HC574PWRG4 reliable?
The price and inventory of SN74HC574PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74HC574PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574PWRG4?
SN74HC574PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574PWRG4 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 SN74HC574PWRG4?
For technical support, including SN74HC574PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574PWRG4 requirements.
6.How does Aetrix verify that SN74HC574PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC574PWRG4 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 SN74HC574PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC574PWRG4?
All SN74HC574PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574PWRG4, 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 SN74HC574PWRG4 part is unused and in its original packaging.
Return procedure for SN74HC574PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC574PWRG4 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…
