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Texas Instruments SN74ALS374ADW
- Part No.:
- SN74ALS374ADW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS374ADW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:217
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Product details
Overview
SN74ALS374ADW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs in a 20-pin SOIC (DW) package, operating from 0°C to 70°C, featuring 12 mA low-level output drive, 2.4 V minimum VOH at 12 mA, and 35 MHz maximum clock frequency. It serves as a bus interface register in industrial control backplanes and legacy data acquisition systems.
For engineers reviewing the SN74ALS374ADW datasheet, SN74ALS374ADW pinout, SN74ALS374ADW application, or SN74ALS374ADW equivalent, this page delivers verified timing parameters (tsu = 10 ns, th = 4 ns), 3-state enable behavior (tPZH = 3 ns), thermal impedance (θJA = 58°C/W), and direct package mapping to DW-20 for PCB layout and thermal design.
Technical Context
This device implements eight independent D-type latches triggered on the positive clock edge, with fully buffered OE and CLK inputs to minimize loading and skew. Each channel supports true (non-inverted) Q outputs and high-impedance tri-state control independent of internal state retention.
It belongs to the ALS (Advanced Low-Power Schottky) logic family, delivering lower power than AS variants while maintaining higher speed than standard LS. Its 3-state outputs drive capacitive buses directly without pull-ups, and OE does not affect internal flip-flop operation-enabling concurrent data latching and bus release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - balances speed (35 MHz) and power (ICC = 20 mA max active) better than LS, slower but more robust than AS. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems; VIH = 2.0 V, VIL = 0.8 V ensures noise margin in noisy industrial environments. |
| Output Drive | IOL = 12 mA / IOH = –1 mA - sufficient to drive 50 pF loads at full speed without external buffers; VOL ≤ 0.4 V guarantees solid logic low under load. |
| Timing (tPLH/tPHL) | 3–12 ns propagation delay - enables reliable 35 MHz operation with 10 ns setup and 4 ns hold time, critical for synchronous bus handshaking. |
| 3-State Enable Delay | tPZH = 3 ns, tPHZ = 1 ns - fast bus release and capture, minimizing bus contention windows in multiplexed I/O architectures. |
| Thermal Resistance | θJA = 58°C/W (DW package) - defines maximum power dissipation (20 mA ICC × 5 V ≈ 100 mW) yielding ~5.8°C rise above ambient at natural convection. |
Pinout & Package
SN74ALS374ADW uses a 20-pin SOIC (DW) package per JEDEC MS-013, 7.5 mm body width, 2.65 mm max height, 1.27 mm lead pitch. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; when high, all Q outputs enter high-Z; does not affect internal latch state. |
| 2–9, 11–18 | D1–D8, Q1–Q8 | Paired data inputs and true outputs; D1→Q1, D2→Q2, etc.; no inversion or cross-coupling. |
| 10 | GND | Ground reference for all logic and output stages; must be low-impedance for stable 3-state transitions. |
| 19 | VCC | +5 V supply; decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin. |
| 20 | CLK | Positive-edge-triggered clock input; internally buffered to reduce skew across eight channels. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latches with edge triggering | Enables simultaneous capture of 8-bit parallel data on rising CLK edge-ideal for address/data latching in microprocessor buses. |
| 3-state outputs with independent OE | Allows bidirectional bus sharing without external transceivers; OE assertion releases bus without disrupting internal register contents. |
| Buffered control inputs (CLK, OE) | Reduces fan-out loading and input capacitance (< 3 pF), enabling clean signal integrity across multiple devices on same bus. |
| ALS logic family performance | Delivers 35 MHz operation at 20 mA ICC-lower power than AS variants while retaining speed advantage over standard LS. |
| SOIC (DW) packaging | Surface-mount 20-pin footprint compatible with automated assembly; RoHS-compliant NiPdAu lead finish and MSL Level-1 rating. |
Applications
| Industrial Backplane Interface | Data Acquisition Input Register |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as an 8-bit transparent latch and bus driver, synchronizing peripheral reads/writes to system clock edges. Use Value: Eliminates need for discrete buffers or pull-up resistors; 12 mA drive handles 50 pF trace capacitance typical in 100 mm backplane runs. |
Use Scenario: Capturing analog-to-digital converter (ADC) parallel output in real-time monitoring systems. IC Role / Device Role / Timing Role: Latches 8-bit ADC result on CLK↑, then places Q outputs in high-Z until host MCU asserts OE for readback. Use Value: Prevents bus contention during conversion; 10 ns setup/4 ns hold ensures reliable capture at 35 MHz sampling rates. |
| Legacy Microprocessor Bus Expansion | Programmable Logic Control Register |
|
Use Scenario: Adding parallel I/O ports to Z80 or 8085-based embedded controllers via ISA-style expansion slots. IC Role / Device Role / Timing Role: Functions as an I/O port latch-D inputs connect to data bus, Q outputs drive peripheral control lines. Use Value: OE allows dynamic port disabling; 3-state outputs prevent conflicts when multiple peripherals share same bus segment. |
Use Scenario: Holding configuration bits for FPGA or CPLD configuration in field-deployed automation hardware. IC Role / Device Role / Timing Role: Stores static control word written once at power-up; Q outputs drive enable/disable signals to downstream ICs. Use Value: Retains state during OE assertion-enabling safe reconfiguration of other logic without disturbing stored settings. |
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 |
|---|---|---|---|
| SN74ALS374AN | Same ALS logic, identical electrical specs, but in 20-pin PDIP (N) package - larger footprint, through-hole mounting. | Suitable for prototyping or legacy through-hole boards; lacks SOIC thermal performance (θJA = 69°C/W vs. 58°C/W). | Select SN74ALS374AN only when manual assembly or socketing is required; SN74ALS374ADW preferred for volume SMT production. |
| SN74AS374N | AS-family variant: faster (125 MHz fmax), higher drive (IOL = 48 mA), but higher ICC (128 mA) and stricter VIH/VIL thresholds. | Better for high-speed bus arbitration; unsuitable where ALS's lower power or wider noise margin is needed. | Choose SN74AS374N only if system demands >35 MHz operation and can support increased power/heat; not drop-in compatible due to timing and drive differences. |
Compared with SN74ALS374AN and SN74AS374N, the SN74ALS374ADW provides optimal balance of speed, power, and manufacturability in surface-mount form-making it the preferred choice for new industrial PCB designs requiring proven 5 V TTL compatibility and thermal efficiency.
Availability
SN74ALS374ADW is available at Aetrix Electronics and suitable for industrial backplane interfaces, data acquisition input registers, legacy microprocessor bus expansion, and programmable logic control registers requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS374ADW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS374ADW belongs to TI's legacy TTL logic portfolio, designed specifically for robust 5 V digital interfacing in industrial control, test equipment, and military-grade systems requiring reliability over wide temperature ranges.
FAQ
What is the maximum clock frequency supported by the SN74ALS374ADW?
The SN74ALS374ADW supports a maximum clock frequency of 35 MHz across its 0°C to 70°C operating range. This is validated by timing parameters including tPLH = 3–12 ns and tPHL = 5–16 ns, with 10 ns setup and 4 ns hold time ensuring reliable edge-triggered operation at full speed.
Does the SN74ALS374ADW support hot-swapping or live insertion into a powered bus?
No, the SN74ALS374ADW does not support hot-swapping. Its absolute maximum ratings specify VI ≤ 7 V and VCC ≤ 5.5 V, and the device lacks bus-hold or power-up/down protection circuitry. Insertion into a live 5 V bus risks latch-up or damage due to uncontrolled voltage sequencing.
Can the SN74ALS374ADW drive a 100 pF load at 35 MHz?
The SN74ALS374ADW is characterized for 50 pF loads per switching specification. Driving 100 pF exceeds its tested condition and may degrade tPLH/tPHL beyond 12 ns, increase VOL, and risk timing violations. For 100 pF, use a buffer stage or select a higher-drive variant like SN74AS374N.
What is the function of the OE pin during clock transitions on the SN74ALS374ADW?
The OE pin on the SN74ALS374ADW is asynchronous and independent of CLK. When OE is high, outputs go high-impedance regardless of CLK activity; internal latches retain their state. Data can be loaded or held while OE is asserted-no race conditions occur between OE and CLK edges.
Is the SN74ALS374ADW pin-compatible with the SN74ALS374ADWR?
Yes, SN74ALS374ADW and SN74ALS374ADWR share identical pinout, electrical specifications, and DW-20 SOIC package dimensions. The only difference is packaging format: SN74ALS374ADW is obsolete and supplied in tube, while SN74ALS374ADWR is active and supplied in tape-and-reel (2000 pcs/reel) with NIPDAU finish.
SN74ALS374ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 35 MHz
- Max Propagation Delay @ V, Max CL:
- 16ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 19 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS374ADW FAQ
1.How can I place an order for SN74ALS374ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS374ADW 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 SN74ALS374ADW reliable?
The price and inventory of SN74ALS374ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS374ADW is usually 5 days.
3.What payment methods are accepted for SN74ALS374ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS374ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS374ADW?
SN74ALS374ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS374ADW 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 SN74ALS374ADW?
For technical support, including SN74ALS374ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS374ADW requirements.
6.How does Aetrix verify that SN74ALS374ADW is sourced from the original manufacturer or authorized distributors?
All SN74ALS374ADW 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 SN74ALS374ADW meets industry standards.
7.What is the process for return or replacement of SN74ALS374ADW?
All SN74ALS374ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS374ADW, 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 SN74ALS374ADW part is unused and in its original packaging.
Return procedure for SN74ALS374ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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