My Inquiry
My Account
Texas Instruments SN74HC574PW
- Part No.:
- SN74HC574PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC574PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:163
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC574PW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus driving in digital systems. It operates across 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 supports clock frequencies up to 24 MHz at 5 V. It is used in I/O port buffering and bidirectional data bus control.
For engineers reviewing the SN74HC574PW datasheet, SN74HC574PW pinout, SN74HC574PW application, or SN74HC574PW equivalent, key selection criteria include its TSSOP-20 package, 3-state bus-compatible output architecture, wide supply voltage range, low 80-µA max ICC, and precise setup/hold timing requirements for synchronous data capture.
Technical Context
The SN74HC574PW implements eight independent D-type flip-flops, each triggered on the low-to-high transition of CLK. Its buffered OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal register operation - enabling seamless bus sharing and hot-swappable data routing.
It uses standard CMOS silicon process with TTL-compatible input thresholds and rail-to-rail output swing. The device features bus-structured pinout (D0–D7 inputs adjacent to Q0–Q7 outputs), low input current (≤1 µA), and thermal metrics including RθJA = 131.8 °C/W for the TSSOP package - critical for thermal-aware PCB layout in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables interoperability with 3.3 V and 5 V logic domains without level shifters. |
| Max Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or terminate unterminated transmission lines. |
| Propagation Delay (tpd) | 22 ns typical (VCC = 4.5 V, CL = 50 pF) - defines maximum achievable data throughput in synchronous bus interfaces. |
| Setup/Hold Time | tsu = 25 ns, th = 5 ns (VCC = 4.5 V) - constrains minimum clock period and dictates timing margin for reliable latch operation. |
| Quiescent Current (ICC) | 80 µA max - ensures minimal static power draw in battery-backed or low-power standby modes. |
| Input Capacitance (Ci) | 10 pF max - limits capacitive loading on upstream drivers and preserves signal integrity in high-speed traces. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial-grade embedded systems including motor control and instrumentation. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm, 1.2 mm max height), JEDEC MO-153 compliant, lead-free NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock input | Edge-sensitive trigger: registers D0–D7 on rising edge; synchronizes data transfer to system clock domain. |
| 2–9 (D0–D7) | Data inputs | Parallel 8-bit data path; accepts asynchronous input prior to clock edge; must be stable during tsu/th window. |
| 10 (GND) | Ground reference | Common return for all signals and power; requires low-inductance connection to minimize ground bounce. |
| 11–18 (Q0–Q7) | 3-state outputs | Driven high/low when OE = L; high-impedance when OE = H - enables shared-bus arbitration without external tri-state logic. |
| 19 (OE) | Output enable | Active-low control: asserts 3-state mode independently of clock; allows output gating without disrupting internal register state. |
| 20 (VCC) | Power supply | Primary supply rail; requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 2 V to 6 V operation supports mixed-voltage system integration and legacy 5 V compatibility. |
| High-current 3-state outputs | ±6 mA drive capability eliminates need for external bus buffers in most microcontroller peripheral interfaces. |
| Low quiescent power | 80 µA max ICC enables use in always-on subsystems where leakage and standby current are constrained. |
| Bus-structured pinout | Adjacent D/Q pairing simplifies PCB routing and reduces trace crosstalk in parallel data paths. |
| CMOS input characteristics | 1 µA max input current and TTL-compatible thresholds ensure robust interfacing with diverse logic families. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Parallel Bus Interface |
|---|---|
|
Use Scenario: Expanding GPIO count on a programmable logic controller CPU board using parallel address/data multiplexing. IC Role / Device Role / Timing Role: Acts as an output latch for digital output modules, holding actuator states between scan cycles while isolating CPU bus during updates. Use Value: Enables deterministic 8-bit output hold with zero software overhead; 3-state outputs prevent bus contention during CPU readback operations. |
Use Scenario: Connecting an 8-bit microcontroller to external SRAM or LCD controller via shared data/address bus. IC Role / Device Role / Timing Role: Serves as bidirectional data latch - captures incoming data on rising CLK and drives outgoing data under OE control. Use Value: Eliminates need for discrete transceivers; ±6 mA drive ensures clean signal edges across 10 cm PCB traces at 24 MHz clock rates. |
| Digital Test Equipment Data Capture | Automotive Body Control Module |
|
Use Scenario: Capturing parallel sensor status bits (e.g., door open/closed, seatbelt fastened) in real-time diagnostic hardware. IC Role / Device Role / Timing Role: Functions as synchronized input register - samples 8-channel status on system clock edge and presents stable data to MCU via 3-state bus. Use Value: 25 ns setup time guarantees reliable sampling at 20 MHz test clock; low 10 pF input capacitance prevents signal degradation from long sensor harnesses. |
Use Scenario: Managing lighting and switch inputs in a vehicle body control unit operating from 12 V battery via 5 V regulator. IC Role / Device Role / Timing Role: Buffers push-button inputs and drives LED indicators, leveraging 2–6 V supply tolerance to accommodate regulator ripple and cold-crank conditions. Use Value: –40 °C to +85 °C rating ensures reliability across automotive ambient range; 80 µA ICC minimizes parasitic drain on backup battery circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT574PW | CMOS inputs with TTL thresholds (VIH = 2 V min); identical pinout and timing. | Better noise immunity in noisy 5 V industrial environments; not suitable for 2–3.3 V only systems. | Select when interfacing with legacy TTL or 5 V microcontrollers requiring guaranteed VIH/VIL margins. |
| 74LCX574MTCX | Lower VCC range (2–3.6 V), 3.6 V tolerant inputs, 5.5 ns tpd (typ), smaller TSSOP-20 footprint (5.0 × 4.4 mm). | Optimized for 3.3 V portable/embedded designs; incompatible with 5 V buses without level translation. | Prefer for space-constrained, low-voltage battery-powered devices where speed >24 MHz is required. |
Compared with SN74HC574PW, SN74HCT574PW offers enhanced noise immunity in 5 V systems but lacks 2 V operation, while 74LCX574MTCX delivers higher speed and lower voltage compliance at the cost of 5 V bus compatibility - making SN74HC574PW the optimal general-purpose choice for mixed-voltage industrial control.
Availability
SN74HC574PW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller parallel bus interface, and automotive body control module designs requiring stable component supply and long-term lifecycle support.
Supply support for SN74HC574PW 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 SN74HC574PW belongs to TI's HC logic family - engineered for high noise immunity, low power, and broad voltage operation in industrial control, instrumentation, and communication infrastructure applications.
FAQ
What is the maximum clock frequency supported by SN74HC574PW?
The SN74HC574PW 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. Performance degrades at lower supply voltages: 4 MHz at 2 V. These values assume proper load and layout per TI's SCLS148H datasheet Figure 6-1 test conditions.
Does SN74HC574PW support hot insertion or live bus swapping?
SN74HC574PW does not include built-in hot-swap protection. While its 3-state outputs allow safe bus disconnection when OE is asserted, the device lacks current-limiting or undervoltage lockout circuitry. For live insertion, external series resistors and sequencing controls are required to prevent supply rail disturbance or latch-up during plug-in events.
Can SN74HC574PW drive LEDs directly without current-limiting resistors?
No. Although SN74HC574PW provides ±6 mA output drive at 5 V, direct LED connection risks exceeding absolute maximum ratings and causing premature wear. Each output must include a series resistor sized to limit current to ≤6 mA - e.g., 470 Ω for a 2 V red LED at 5 V VCC - to ensure long-term reliability and thermal stability.
What is the function of the OE pin during clock transitions in SN74HC574PW?
The OE pin in SN74HC574PW is asynchronous and does not affect internal flip-flop operation. When OE is high (disabled), outputs go high-impedance regardless of CLK activity; data continues to be latched on rising CLK edges and retained internally. This allows concurrent data capture and bus isolation - critical for glitch-free multi-master bus arbitration.
Is SN74HC574PW RoHS compliant and lead-free?
Yes. SN74HC574PW is RoHS compliant with NiPdAu lead finish and meets JEDEC MSL Level-1 moisture sensitivity requirements. Per TI's PACKAGE OPTION ADDENDUM, it carries "Yes" in the RoHS column and "NIPDAU" in the lead finish field, confirming full compliance with EU Directive 2011/65/EU and subsequent amendments.
SN74HC574PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 36 MHz
- Max Propagation Delay @ V, Max CL:
- 46ns @ 6V, 150pF
- 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
SN74HC574PW FAQ
1.How can I place an order for SN74HC574PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574PW 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 SN74HC574PW reliable?
The price and inventory of SN74HC574PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574PW is usually 5 days.
3.What payment methods are accepted for SN74HC574PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574PW?
SN74HC574PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574PW 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 SN74HC574PW?
For technical support, including SN74HC574PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574PW requirements.
6.How does Aetrix verify that SN74HC574PW is sourced from the original manufacturer or authorized distributors?
All SN74HC574PW 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 SN74HC574PW meets industry standards.
7.What is the process for return or replacement of SN74HC574PW?
All SN74HC574PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574PW, 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 SN74HC574PW part is unused and in its original packaging.
Return procedure for SN74HC574PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC574PW 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…
