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Texas Instruments CD74AC374ME4
- Part No.:
- CD74AC374ME4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74AC374ME4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,513
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Product details
Overview
CD74AC374ME4 from Texas Instruments is an octal D-type positive-edge-triggered flip-flop with 3-state outputs, designed for bus-oriented data latching and buffering in digital systems. It operates across 1.5 V to 5.5 V supply, delivers ±24 mA output drive per pin, supports up to 143 MHz clock frequency at 5 V, and features balanced propagation delays (9.8 ns typical at 5 V). It is used in microcontroller peripheral interfacing and address/data bus isolation.
For engineers reviewing the CD74AC374ME4 datasheet, CD74AC374ME4 pinout, CD74AC374ME4 application, or CD74AC374ME4 equivalent, key selection criteria include its 3-state enable control, wide voltage range compatibility, high-speed CMOS performance, latch-up resistance, and SOIC-20 package suitability for space-constrained industrial PCBs.
Technical Context
The CD74AC374ME4 implements eight independent D-type flip-flops synchronized to the rising edge of CLK, with asynchronous 3-state control via OE. Its RCA Advanced CMOS process ensures SCR latch-up immunity and balanced noise margins (30% of VCC) across the full 1.5–5.5 V operating range.
All outputs share a common output-enable (OE) input that places them simultaneously in high-impedance without affecting internal register state. Propagation delays (tPLH/tPHL) and enable/disable timing (tPZH/tPHZ) are tightly matched-critical for synchronous bus timing integrity in multi-bit data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V - enables interoperability with 1.8 V, 3.3 V, and 5 V logic domains without level shifters |
| Max Clock Frequency | 143 MHz at VCC = 5 V - supports high-throughput data capture in real-time control and instrumentation |
| Output Drive | ±24 mA per output - drives 50 Ω transmission lines directly and fans out to 15 FAST ICs |
| Propagation Delay | 9.8 ns typical (CLK to Q, VCC = 5 V) - ensures sub-10 ns timing margin for 100+ MHz system clocks |
| Input Voltage Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5 V - provides robust noise immunity with 30% noise margin |
| Quiescent Current | 160 μA max (TA = –55°C to +125°C) - enables low-power operation in extended-temperature industrial environments |
| ESD Rating | ±2000 V HBM - meets standard handling requirements for automated assembly and field service |
Pinout & Package
CD74AC374ME4 is supplied in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (including pins), with body dimensions of 12.80 mm × 7.50 mm. The package is RoHS-compliant, moisture-sensitivity Level-1 rated, and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable input | Active-low control: asserts high-impedance on all Q outputs when HIGH; does not affect internal register state |
| 2–9, 12, 15–19 (1Q–8Q) | Tri-state buffered outputs | Non-inverted registered data outputs; each capable of ±24 mA drive into 50 Ω loads |
| 3–4, 7–8, 13–14, 17–18 (1D–8D) | Data inputs | CMOS-compatible inputs tolerant up to 5.5 V regardless of VCC; no external pull-ups required |
| 11 (CLK) | Clock input | Positive-edge-triggered; synchronizes all eight D-to-Q transfers simultaneously |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance for signal integrity |
| 20 (VCC) | Power supply | Single-supply rail supporting 1.5–5.5 V; requires local 0.1 µF bypass capacitor per VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| SCR latch-up resistant CMOS process | Guarantees immunity to destructive latch-up under transient overvoltage or ESD stress in industrial environments |
| Balanced propagation delays | Ensures <1 ns skew between outputs - critical for parallel bus timing compliance in high-speed data acquisition |
| 3-state output enable with independent register control | Allows concurrent data latching and bus release - enables seamless handshaking in shared-memory architectures |
| 1.5 V to 5.5 V wide supply range | Eliminates need for voltage translation when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V legacy peripherals) |
| ±24 mA output drive capability | Directly drives terminated transmission lines without external buffers - reduces BOM count and layout area |
Applications
| Microcontroller Bus Interface | Industrial Data Acquisition |
|---|---|
Use Scenario: Interfacing an 8-bit microcontroller's address/data multiplexed bus to external memory or peripherals. IC Role / Device Role / Timing Role: Latches address bits during ALE assertion and isolates data bus during read/write cycles using OE control. Use Value: Eliminates need for discrete buffers or pull-up resistors; supports clean 5 V/3.3 V domain bridging with sub-10 ns setup/hold timing. |
Use Scenario: Capturing parallel sensor outputs (e.g., 8-channel ADC) in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Synchronizes analog-to-digital conversion results to system clock and presents stable data to FPGA or DSP via 3-state bus. Use Value: Provides deterministic sampling edge alignment and high-impedance bus release during idle periods - prevents contention in multi-master backplanes. |
| Test Equipment Signal Conditioning | Automated Test Fixture Control |
Use Scenario: Buffering and timing-critical routing of stimulus signals in benchtop oscilloscopes or logic analyzers. IC Role / Device Role / Timing Role: Acts as a jitter-minimized pipeline stage between pattern generator and DUT interface, leveraging matched tPLH/tPHL. Use Value: Delivers <1 ns inter-output skew and 9.8 ns propagation delay - preserves signal fidelity in sub-10 ns timing windows. |
Use Scenario: Controlling 8-channel relay banks or LED status indicators in production test fixtures. IC Role / Device Role / Timing Role: Registers control commands from host controller and drives high-current loads (e.g., 20 mA LEDs) directly. Use Value: Integrates latching, driving, and bus isolation in one SOIC-20 device - reduces footprint by >40% vs. discrete driver + latch solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC374N | Same AC logic family, identical pinout and timing, but TI's newer commercial-grade PDIP variant with tighter VIL/VIH specs at 3.3 V | Optimized for 0°C to 70°C commercial use; lacks extended temperature range (–55°C to +125°C) of CD74AC374ME4 | Select when cost-sensitive commercial designs do not require military/industrial temperature support. |
| 74LVC374APW | Lower voltage operation (1.65–3.6 V only); 24 mA drive; 3.3 V optimized; different pinout (TSSOP-20) | Not suitable for 5 V systems or extended temperature operation; requires PCB redesign due to TSSOP package and pin assignment differences | Choose only for new 3.3 V-only designs where board space savings from TSSOP outweigh requalification effort. |
Compared with SN74AC374N and 74LVC374APW, CD74AC374ME4 uniquely supports the full –55°C to +125°C range in SOIC while maintaining 1.5–5.5 V flexibility and proven latch-up immunity - making it the sole option for ruggedized embedded control where voltage scalability and environmental resilience are co-required.
Availability
CD74AC374ME4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and aerospace avionics requiring stable component supply across extended temperature ranges and mixed-voltage interfaces.
Supply support for CD74AC374ME4 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 high-reliability component design heritage.
The CD74AC374ME4 belongs to TI's legacy Advanced CMOS (AC) logic family, engineered for robust performance in harsh industrial and military environments where latch-up immunity, wide voltage operation, and extended temperature stability are mandatory.
FAQ
What is the maximum clock frequency supported by CD74AC374ME4 at 3.3 V operation?
At VCC = 3.3 V, the CD74AC374ME4 supports a maximum clock frequency of 101 MHz over the –40°C to +85°C temperature range, and 89 MHz over the full –55°C to +125°C range. These values are specified in Section 4.7 of the TI SCHS290A datasheet and reflect guaranteed timing performance under worst-case conditions with CL = 50 pF and tr/tl = 3 ns.
Does CD74AC374ME4 support 1.8 V logic levels?
Yes, CD74AC374ME4 supports 1.8 V operation: its recommended supply range is 1.5 V to 5.5 V, and input thresholds scale with VCC. At 1.8 V, VIH is 1.2 V and VIL is 0.3 V, providing 33% noise margin - sufficient for reliable interfacing with 1.8 V microcontrollers and FPGAs without level translation.
Can CD74AC374ME4 drive a 50 Ω transmission line directly?
Yes, CD74AC374ME4 is explicitly characterized to drive 50 Ω transmission lines at +85°C and 75 Ω at +125°C, per Section 4.5 footnote (2) of the datasheet. Its ±24 mA output drive ensures clean signal edges into such loads, eliminating the need for external line drivers in high-speed digital interconnects.
What is the function of the OE pin on CD74AC374ME4?
The OE (Output Enable) pin on CD74AC374ME4 is an active-high control that places all eight Q outputs in high-impedance state without affecting internal register contents. When OE is LOW, outputs reflect registered D-input values; when HIGH, outputs disconnect from the bus - enabling safe multi-drop bus sharing and hot-swappable subsystem design.
Is CD74AC374ME4 pin-compatible with CD74ACT374 variants?
No, CD74AC374ME4 is not pin-compatible with CD74ACT374 variants in functional operation: although both share identical pinouts and package footprints, the ACT version requires minimum 4.5 V supply and has TTL-compatible input thresholds (VIH = 2.0 V), whereas CD74AC374ME4 operates down to 1.5 V with CMOS thresholds. Swapping them risks logic failure or damage outside specified VCC ranges.
CD74AC374ME4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74AC374ME4 FAQ
1.How can I place an order for CD74AC374ME4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC374ME4 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 CD74AC374ME4 reliable?
The price and inventory of CD74AC374ME4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC374ME4 is usually 5 days.
3.What payment methods are accepted for CD74AC374ME4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC374ME4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC374ME4?
CD74AC374ME4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC374ME4 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 CD74AC374ME4?
For technical support, including CD74AC374ME4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC374ME4 requirements.
6.How does Aetrix verify that CD74AC374ME4 is sourced from the original manufacturer or authorized distributors?
All CD74AC374ME4 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 CD74AC374ME4 meets industry standards.
7.What is the process for return or replacement of CD74AC374ME4?
All CD74AC374ME4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC374ME4, 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 CD74AC374ME4 part is unused and in its original packaging.
Return procedure for CD74AC374ME4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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