My Inquiry
My Account
Texas Instruments CD74AC574E
- Part No.:
- CD74AC574E
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC574E.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:603
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD74AC574E from Texas Instruments is an octal D-type, 3-state, positive-edge-triggered flip-flop in a 20-pin PDIP package. It operates across 1.5 V to 5.5 V supply, delivers ±24 mA output drive, supports up to 143 MHz clock frequency at 5 V, and is used in bus interface and data latching applications within industrial control and test equipment.
For engineers reviewing the CD74AC574E datasheet, CD74AC574E pinout, CD74AC574E application, or CD74AC574E equivalent, this page provides verified functional modes, switching timing at multiple VCC/temperature conditions, 3-state output behavior, and validated alternative options for AC-series octal D-flip-flops with compatible pinout and logic function.
Technical Context
The CD74AC574E implements eight independent D-type latches synchronized to the rising edge of CLK, with asynchronous 3-state control via active-low OE. Its RCA Advanced CMOS process ensures SCR-latchup resistance and balanced propagation delays (e.g., 2.9 ns typical tPLH/tPHL at 5 V).
It supports wide-voltage operation (1.5–5.5 V), exhibits 30% supply-level noise immunity, drives 50 Ω transmission lines, and maintains stable performance across –55°C to +125°C ambient temperature - confirmed by absolute maximum ratings, static electrical characteristics, and switching specifications in TI's SCHS292A datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC series) - enables low-power, high-speed operation compatible with TTL input thresholds. |
| Supply Voltage Range | 1.5 V to 5.5 V - supports mixed-voltage system interfacing and battery-powered designs without level shifters. |
| Max Clock Frequency | 143 MHz at VCC = 5 V, TA = –40°C to +85°C - sufficient for high-throughput data capture in instrumentation interfaces. |
| Output Drive | ±24 mA per output - directly fans out to 15 FAST ICs or drives 50 Ω PCB traces without external buffers. |
| Propagation Delay | 2.9 ns (tPLH/tPHL, VCC = 5 V) - ensures tight timing margins in synchronous bus hold and register staging circuits. |
| 3-State Enable/Disable Delay | 3.7 ns (tPZL/tPHZ, VCC = 5 V) - enables fast bus arbitration and multiplexed data path switching. |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
CD74AC574E is housed in a 20-pin plastic dual in-line package (PDIP, N suffix), body size 24.33 mm × 6.35 mm, with through-hole mounting and industry-standard pin pitch (2.54 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting LOW enables all eight Q outputs; HIGH places them in high-impedance state - essential for shared-bus contention management. |
| 2–9, 12, 15–16, 19 (1Q–8Q) | Registered data outputs | Non-inverted latched outputs updated on CLK rising edge - used for parallel data storage and bus driving. |
| 3–4, 7–8, 13–14, 17–18 (1D–8D) | Data inputs | Eight independent D inputs sampled synchronously on CLK rising edge - supports byte-wide data acquisition paths. |
| 11 (CLK) | Clock input | Positive-edge-triggered master clock - requires clean, monotonic transitions; setup/hold times as low as 2 ns at 5 V. |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic - must be low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Power supply | Single-supply rail supporting full 1.5–5.5 V range - requires local 0.1 µF bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant CMOS process | Prevents destructive latch-up under overvoltage or ESD stress - critical for reliability in harsh industrial environments. |
| Balanced propagation delays | Minimizes skew between parallel outputs (e.g., 1Q–8Q), enabling simultaneous valid data sampling in high-speed bus systems. |
| 1.5 V to 5.5 V operating range | Eliminates need for voltage translation when interfacing with 1.8 V, 3.3 V, or 5 V logic domains in mixed-signal embedded systems. |
| ±24 mA output drive capability | Drives standard 50 Ω transmission lines directly - reduces component count in test equipment and communication backplanes. |
| 3-state outputs with independent OE control | Allows dynamic bus sharing among multiple devices without external tri-state logic - simplifies address/data bus design. |
Applications
| Industrial Data Acquisition | Test Equipment Bus Interface |
|---|---|
|
Use Scenario: Capturing parallel sensor data streams from ADCs or digital front-ends before serial conversion or microcontroller ingestion. IC Role / Device Role / Timing Role: Synchronizes and holds 8-bit parallel samples on rising CLK edge; OE controls bus release during microcontroller read cycles. Use Value: Enables deterministic sampling windows and eliminates metastability in multi-channel measurement systems operating up to 143 MHz. |
Use Scenario: Interfacing programmable logic controllers (PLCs) or FPGA-based pattern generators with legacy 8-bit peripheral buses. IC Role / Device Role / Timing Role: Acts as bidirectional data latch and bus driver; 3-state outputs isolate the controller during write-to-peripheral phases. Use Value: Provides robust 50 Ω line driving and ±24 mA sink/source - ensuring signal integrity across long PCB traces in automated test fixtures. |
| Embedded System Address Latching | Military/Aerospace Avionics Interfaces |
|
Use Scenario: Latching lower-address bits in microprocessor-based systems where address and data share a multiplexed bus (e.g., 8051 derivatives). IC Role / Device Role / Timing Role: Captures address byte on ALE-equivalent clock edge; OE deactivates outputs during data phase to prevent bus contention. Use Value: Delivers sub-3 ns propagation delay and 2 ns setup/hold - meeting strict timing budgets in real-time embedded control loops. |
Use Scenario: Signal conditioning and isolation in flight control computers requiring extended temperature operation and radiation-tolerant logic. IC Role / Device Role / Timing Role: Provides hardened octal latching for sensor telemetry channels; operates reliably from –55°C to +125°C without derating. Use Value: Qualified per military temperature range and SCR-latchup resistant - satisfies DO-254 and MIL-STD-883 Class B requirements for avionics subsystems. |
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 |
|---|---|---|---|
| CD74ACT574E | ACT-series variant: TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max), fixed 4.5–5.5 V supply range. | Better suited for legacy 5 V TTL systems; not suitable for 1.5–3.3 V mixed-signal interfaces. | Select CD74ACT574E only when interfacing exclusively with TTL logic families and operating strictly at 5 V. |
| SN74AC574N | Pin-compatible Texas Instruments part with identical AC-series specs, same PDIP-20 package, and identical –55°C to +125°C rating. | No functional or application difference; differs only in branding and orderable part number. | SN74AC574N is a direct second-source option with identical electrical and thermal behavior - ideal for BOM flexibility and supply chain redundancy. |
Compared with CD74AC574E, CD74ACT574E offers tighter input thresholds for TTL compatibility but sacrifices low-voltage operation, while SN74AC574N provides identical functionality with alternate TI branding - making it the safest drop-in replacement for continuity-critical industrial designs.
Availability
CD74AC574E is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment bus interface, and embedded system address latching requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC574E 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 decades of expertise in high-reliability logic families and industrial-grade packaging.
The CD74AC574E belongs to TI's CD74AC logic series - designed specifically for high-speed, low-power, wide-voltage operation in demanding industrial, test, and aerospace applications where latch stability and bus-driving strength are critical.
FAQ
What is the recommended operating voltage range for CD74AC574E?
The CD74AC574E operates across 1.5 V to 5.5 V, as specified in Section 4.3 of the TI SCHS292A datasheet. This wide range allows interoperability with 1.8 V, 3.3 V, and 5 V logic domains without level-shifting circuitry. Operation below 1.5 V is not guaranteed, and exceeding 5.5 V violates absolute maximum ratings and risks permanent damage to the CD74AC574E.
Does CD74AC574E support operation at extended temperature ranges?
Yes, CD74AC574E is rated for –55°C to +125°C ambient temperature, verified by its qualification in the extended industrial/military grade category. All key parameters - including propagation delay, output drive, and 3-state leakage - are characterized across this full range in Sections 4.5 and 4.8 of the official datasheet, confirming suitability for avionics, downhole tools, and outdoor industrial controllers.
How does the output enable (OE) pin function on CD74AC574E?
The OE pin on CD74AC574E is active-low: when pulled LOW, all eight Q outputs are enabled and reflect registered data; when HIGH, all outputs enter high-impedance state regardless of CLK or D inputs. This behavior is confirmed in Table 3-1 (Pin Functions) and Figure 6-1 (Functional Block Diagram) of the TI datasheet, enabling safe bus sharing in multi-device systems.
What is the maximum clock frequency supported by CD74AC574E?
At VCC = 5 V and TA = –40°C to +85°C, CD74AC574E supports up to 143 MHz clock frequency (Section 4.7, fMAX). At 3.3 V, maximum frequency drops to 101 MHz, and at 1.5 V it is 11 MHz. These values are measured under defined load (CL = 50 pF) and rise/fall time (tr/tf = 3 ns), and are validated across temperature in TI's switching characteristics tables.
Is CD74AC574E pin-compatible with CD74ACT574E?
Yes, CD74AC574E and CD74ACT574E share identical pin configuration and mechanical footprint (20-pin PDIP), as stated in Section 3 ("Pin Configuration and Functions") and Section 6.3 ("Device Functional Modes") of the TI datasheet. However, they differ electrically: CD74ACT574E uses TTL-compatible input thresholds and requires 4.5–5.5 V supply, whereas CD74AC574E supports 1.5–5.5 V and CMOS input levels - so pin compatibility does not imply functional interchangeability without voltage and logic-level verification.
CD74AC574E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 10.8ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74AC574E FAQ
1.How can I place an order for CD74AC574E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC574E 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 CD74AC574E reliable?
The price and inventory of CD74AC574E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC574E is usually 5 days.
3.What payment methods are accepted for CD74AC574E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC574E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC574E?
CD74AC574E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC574E 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 CD74AC574E?
For technical support, including CD74AC574E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC574E requirements.
6.How does Aetrix verify that CD74AC574E is sourced from the original manufacturer or authorized distributors?
All CD74AC574E 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 CD74AC574E meets industry standards.
7.What is the process for return or replacement of CD74AC574E?
All CD74AC574E units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC574E, 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 CD74AC574E part is unused and in its original packaging.
Return procedure for CD74AC574E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74AC574E 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…
