My Inquiry
My Account
Texas Instruments CD74HC574M
- Part No.:
- CD74HC574M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HC574M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD74HC574M from Texas Instruments is an octal D-type flip-flop with 3-state outputs, positive-edge clock triggering, and bus-driving capability. It operates from 2 V to 6 V, delivers 15 ns typical propagation delay at 5 V/15 pF, supports –55℃ to 125℃ temperature range, and drives up to 15 LSTTL loads - used in digital bus interface and data latching applications in industrial control systems.
For engineers reviewing the CD74HC574M datasheet, CD74HC574M pinout, CD74HC574M application, or CD74HC574M equivalent, this page provides verified functional identity, SOIC-20 package mapping, timing parameters under defined load conditions, truth table behavior, and validated alternative options for bus-hold and level-shifting logic designs.
Technical Context
The CD74HC574M implements eight independent edge-triggered D flip-flops synchronized on the LOW-to-HIGH clock transition. Its output enable (OE) pin controls all eight 3-state outputs independently of register operation, enabling high-impedance states when OE = HIGH.
It belongs to the HC logic family with CMOS input compatibility (II ≤ 1 μA), 30% noise immunity at VCC = 5 V, and rail-to-rail output swing. Propagation delay (tPLH/tPHL), setup time (tSU = 10 ns min at 6 V), and hold time (tH = 5 ns) are specified across full temperature and voltage ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), not TTL-compatible - requires CMOS-level inputs, supports 2–6 V supply |
| Function | Octal D-type flip-flop with 3-state outputs - latches 8-bit parallel data on rising clock edge |
| Propagation Delay | 15 ns typical (VCC = 5 V, CL = 15 pF, TA = 25℃) - determines maximum synchronous data throughput |
| Output Drive | 15 LSTTL loads - enables direct connection to legacy TTL buses without buffer amplification |
| Operating Temperature | –55℃ to 125℃ - qualified for extended industrial and harsh-environment embedded use |
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and low-power operation at 2 V |
| Input Leakage Current | ±1 μA max (VCC = 6 V) - ensures minimal loading on upstream drivers and stable DC logic levels |
Pinout & Package
CD74HC574M is housed in a 20-pin SOIC (DW) package with 12.80 mm × 7.50 mm body size, gull-wing leads, and RoHS-compliant NiPdAu plating. Pin spacing is 1.27 mm, and it is rated MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP) | Clock input | Rising-edge trigger for all eight D flip-flops - data latched on LOW-to-HIGH transition |
| 2–9 (D0–D7) | Data inputs | Asynchronous parallel data inputs - sampled only on active clock edge |
| 11–18 (Q0–Q7) | 3-state outputs | Registered outputs enabled/disabled by OE - high-impedance when OE = HIGH |
| 19 (OE) | Output enable | Active-low control (LOW = outputs enabled, HIGH = outputs high-Z) - independent of clock |
| 10 (GND) | Ground reference | Return path for all internal logic and I/O - must be low-impedance and decoupled |
| 20 (VCC) | Power supply | Primary supply rail (2–6 V) - requires local 0.1-μF bypass capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| Positive-edge triggered register | Ensures deterministic sampling of asynchronous data streams with precise timing alignment |
| Common 3-state output enable | Allows single-control bus arbitration across 8-bit data paths without external gating logic |
| 15 LSTTL load drive capability | Eliminates need for external bus buffers in mixed-logic systems interfacing HC with legacy TTL |
| Wide 2–6 V supply range | Enables interoperability between 3.3 V microcontrollers and 5 V peripheral subsystems |
| –55℃ to 125℃ operating range | Supports deployment in automotive engine compartments, industrial PLC backplanes, and outdoor equipment |
Applications
| Industrial Data Acquisition | Microcontroller Bus Interface |
|---|---|
Use Scenario: Capturing analog-to-digital converter (ADC) output words in real-time data loggers. IC Role / Device Role / Timing Role: Latches parallel 8-bit ADC result on clock edge, holds stable value during microcontroller read cycle. Use Value: Prevents metastability and data corruption during multi-cycle CPU reads by freezing sampled values until fully transferred. |
Use Scenario: Expanding GPIO count of an 8-bit MCU via parallel port expansion. IC Role / Device Role / Timing Role: Acts as bidirectional data latch between MCU data bus and peripheral address/data lines. Use Value: Enables synchronous handshaking with peripherals using OE-controlled tristate isolation and clock-aligned capture. |
| Programmable Logic Control | Digital Test Equipment |
Use Scenario: Isolating and holding sensor status bits in modular PLC I/O modules. IC Role / Device Role / Timing Role: Registers discrete input states and presents them to backplane bus only when enabled. Use Value: Reduces bus contention and allows hot-swap-safe I/O module insertion via controlled OE activation sequence. |
Use Scenario: Capturing and holding pattern generator outputs for signal integrity analysis. IC Role / Device Role / Timing Role: Stores test vector data from FPGA sequencer and drives it onto DUT pins with precise timing. Use Value: Guarantees glitch-free stimulus delivery by eliminating race conditions between clock and data setup/hold windows. |
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 |
|---|---|---|---|
| SN74HC574N | Same HC logic family, identical function and timing, but in PDIP-20 package (25.4 mm × 6.35 mm) | Used where through-hole assembly or prototyping on breadboard/perfboard is required | Select SN74HC574N for manual soldering, educational labs, or legacy board rework where SOIC footprint is unavailable |
| CD74HCT574M | HCT variant - TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), same SOIC-20 package | Required when interfacing directly with 5 V TTL outputs without level shifters | Choose CD74HCT574M only if upstream logic is standard TTL or LS-TTL; otherwise CD74HC574M offers lower power and wider VCC range |
Compared with SN74HC574N and CD74HCT574M, CD74HC574M provides optimal balance of low static current (8 μA typ), wide supply flexibility (2–6 V), and surface-mount compatibility - making it preferred for modern compact industrial controllers where power efficiency and PCB space are constrained.
Availability
CD74HC574M is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and programmable logic control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC574M 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
CD74HC574M belongs to TI's legacy HC logic portfolio designed for robust digital interfacing in harsh environments - targeting applications where deterministic timing, wide temperature operation, and bus isolation are critical.
FAQ
What is the maximum clock frequency supported by CD74HC574M?
The CD74HC574M supports a maximum clock frequency of 23 MHz at VCC = 6 V and –55℃ to 125℃, 29 MHz at 25℃, and 35 MHz at VCC = 6 V/25℃ with CL = 15 pF. These values derive directly from datasheet Section 5.5 and reflect guaranteed timing margins under worst-case conditions - not theoretical limits.
Does CD74HC574M have Schmitt-trigger inputs?
No, CD74HC574M does not include Schmitt-trigger inputs. Its inputs are standard CMOS with VIH = 4.2 V (min at VCC = 6 V) and VIL = 1.8 V (max at VCC = 6 V), providing 30% noise margin but no hysteresis. Signal conditioning is required for noisy or slow-rising waveforms before applying them to CD74HC574M inputs.
Can CD74HC574M drive LEDs directly?
No, CD74HC574M is not intended for direct LED driving. Its outputs source/sink only ±25 mA per pin (absolute max ±35 mA), and sustained DC current degrades reliability. For LED indication, use CD74HC574M to control a discrete transistor or dedicated LED driver - never connect LEDs directly to Q0–Q7 pins.
Is CD74HC574M pin-compatible with CD74HC374M?
No, CD74HC574M and CD74HC374M are functionally identical but differ in pinout arrangement - specifically, the order of D and Q pins is swapped. They share the same SOIC-20 package and electrical specs, but PCB layout and wiring must be redesigned to accommodate the different pin mapping.
What is the purpose of the OE pin on CD74HC574M?
The OE (output enable) pin on CD74HC574M controls all eight 3-state outputs simultaneously. When OE is HIGH, outputs enter high-impedance state regardless of clock or data activity - enabling safe sharing of a common bus among multiple devices. OE is asynchronous and independent of CP or D inputs.
CD74HC574M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 28ns @ 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:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74HC574M FAQ
1.How can I place an order for CD74HC574M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC574M 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 CD74HC574M reliable?
The price and inventory of CD74HC574M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC574M is usually 5 days.
3.What payment methods are accepted for CD74HC574M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC574M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC574M?
CD74HC574M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC574M 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 CD74HC574M?
For technical support, including CD74HC574M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC574M requirements.
6.How does Aetrix verify that CD74HC574M is sourced from the original manufacturer or authorized distributors?
All CD74HC574M 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 CD74HC574M meets industry standards.
7.What is the process for return or replacement of CD74HC574M?
All CD74HC574M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC574M, 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 CD74HC574M part is unused and in its original packaging.
Return procedure for CD74HC574M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74HC574M 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…
