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Texas Instruments SN74AS174DRG4
- Part No.:
- SN74AS174DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AS174DRG4.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,190
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Product details
Overview
SN74AS174DRG4 from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, implemented in advanced Schottky TTL (AS) logic. It contains six independent single-rail output flip-flops, features fully buffered clock and clear inputs, operates at 5 V, supports 100 MHz max clock frequency, and delivers 20 mA low-level output drive. It is used in synchronous data latching within industrial control registers and digital test equipment.
For engineers reviewing the SN74AS174DRG4 datasheet, SN74AS174DRG4 pinout, SN74AS174DRG4 application, or SN74AS174DRG4 equivalent, key selection criteria include its 100 MHz toggle rate, 4 ns minimum clock pulse width, 3.5 ns typical CLK-to-Q propagation delay, direct-clear functionality, and SOIC-16 package compatibility with legacy TTL systems.
Technical Context
The SN74AS174DRG4 implements six identical D-type flip-flop cells sharing a common buffered clock (CLK) and asynchronous clear (CLR) input. Each cell transfers the D-input state to its Q-output on the positive-going edge of CLK, provided setup (4 ns) and hold (1 ns) timing requirements are met.
All inputs and outputs are TTL-compatible, with VIH = 2 V, VIL = 0.8 V, VOH ≥ VCC–2 V, and VOL ≤ 0.5 V at IOL = 20 mA. The device draws up to 45 mA ICC (max) at VCC = 5.5 V and operates across 0°C to 70°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky TTL (AS) - ensures high-speed operation with low power-delay product vs. standard TTL. |
| Flip-Flop Count | 6 independent D-type flip-flops - enables compact 6-bit register implementation without external gating. |
| Max Clock Frequency | 100 MHz - supports high-throughput data capture in digital instrumentation and protocol logic. |
| Propagation Delay (CLK→Q) | 3.5 ns (typ), 8 ns (max) - guarantees tight timing margins in pipelined synchronous designs. |
| Output Drive | IOL = 20 mA, IOH = –2 mA - directly drives multiple TTL loads or small LED indicators without buffers. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with regulated 5 V rails and tolerant of nominal supply variation. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and test equipment environments. |
Pinout & Package
SN74AS174DRG4 is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 7.5 mm body width, and 2.00 mm max height. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - resets all six Q outputs to low independently of clock timing. |
| 2–7, 9–14 | D1–D6 | Data inputs - each feeds one flip-flop; must meet 4 ns setup time before CLK↑. |
| 3, 4, 5, 6, 7, 9 | Q1–Q6 | True outputs - single-rail, non-inverted Q states synchronized to CLK edge. |
| 15 | CLK | Buffered positive-edge clock - triggers simultaneous latching across all six stages. |
| 8 | GND | Ground reference - return path for all internal logic and output currents. |
| 16 | VCC | Power supply - supplies 4.5–5.5 V to all internal gates and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Fully buffered inputs | Reduces sensitivity to noise and fan-out loading on CLK and CLR, enabling reliable operation in noisy industrial PCBs. |
| 100 MHz maximum clock rate | Enables use in high-speed digital test fixtures and real-time data acquisition front-ends where cycle time is critical. |
| Single-rail Q outputs only | Simplifies PCB routing and reduces component count versus dual-rail alternatives like SN74AS175B. |
| 4 ns minimum CLK pulse width | Supports clean triggering even with fast-rising but narrow clock edges generated by programmable logic or microcontrollers. |
| TTL-compatible voltage thresholds | Ensures seamless interoperability with legacy 74LS/74F logic, microcontroller GPIOs, and discrete gate interfaces. |
Applications
| Industrial Control Register | Digital Test Equipment Latch |
|---|---|
|
Use Scenario: Holding 6-bit status flags (e.g., sensor fault codes, valve positions) in PLC I/O modules. IC Role / Device Role / Timing Role: Synchronous data latch triggered by system bus strobe; CLR used for global reset on power-up or fault recovery. Use Value: Eliminates need for discrete gates or larger shift-register ICs-reduces BOM count and layout area while meeting 100 kHz update rates. |
Use Scenario: Capturing parallel output from ATE pattern generators during functional testing of ASICs. IC Role / Device Role / Timing Role: High-speed parallel data sampler synchronized to test clock; CLR clears prior test results before new vector load. Use Value: 3.5 ns CLK→Q delay and 4 ns setup enable sub-10 ns sampling windows, improving test repeatability and margin. |
| Serial-to-Parallel Converter Stage | Microcontroller GPIO Expander |
|
Use Scenario: Converting serial bitstream from UART or SPI into 6-bit parallel word for display driver or DAC interface. IC Role / Device Role / Timing Role: Edge-triggered storage element clocked by shifted-in bit timing; D inputs daisy-chained from shift register output. Use Value: Single-chip solution replaces 6× discrete latches-reduces interconnect skew and improves setup/hold margin over distributed implementations. |
Use Scenario: Extending output capability of resource-constrained MCU (e.g., MSP430) to drive 6 LEDs or relays. IC Role / Device Role / Timing Role: Output register holding MCU's parallel port data; CLR allows safe initialization before first write. Use Value: 20 mA per output drives LEDs directly; SOIC-16 footprint fits compact PCBs without requiring external drivers or level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS174DR | ALS family: lower speed (50 MHz max), higher noise immunity, 19 mA max ICC, 15 ns CLK→Q delay. | Better suited for noise-sensitive analog-adjacent boards; insufficient for >60 MHz clock domains. | Select when power efficiency and EMI robustness outweigh speed requirements. |
| SN74AS175BDR | AS family with complementary Q/Q̅ outputs per stage (4 flip-flops), same 100 MHz rating and SOIC-16 package. | Provides inverted outputs for differential signaling or active-low logic; reduced channel count (4 vs. 6). | Choose when dual-rail outputs are required and 6-bit width is not mandatory. |
Compared with SN74ALS174DR and SN74AS175BDR, the SN74AS174DRG4 uniquely balances 100 MHz performance, six-channel density, and single-rail simplicity-making it optimal for space-constrained, high-speed register applications where inverted outputs are unnecessary.
Availability
SN74AS174DRG4 is available at Aetrix Electronics and suitable for industrial control registers, digital test equipment latches, and microcontroller GPIO expansion requiring stable component supply and long-term production support.
Supply support for SN74AS174DRG4 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 heritage in TTL and advanced logic families.
The SN74AS174DRG4 belongs to TI's 74AS logic series, designed specifically for high-speed, low-power digital systems requiring TTL compatibility, robust timing margins, and industrial-grade reliability.
FAQ
What is the maximum clock frequency supported by SN74AS174DRG4?
The SN74AS174DRG4 supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF, TA = 0°C to 70°C). This value is derived from characterization data per SDAS207E and confirmed in TI's packaging addendum for the SOIC-D variant. The SN74AS174DRG4 achieves this using advanced Schottky TTL circuitry optimized for minimal propagation delay.
Does SN74AS174DRG4 have complementary outputs (Q and Q̅)?
No, the SN74AS174DRG4 provides only true (Q) outputs for all six flip-flops. Complementary outputs are available in the SN74AS175B family, which contains four flip-flops with both Q and Q̅ terminals. The SN74AS174DRG4's single-rail architecture simplifies routing and reduces pin count where inverted signals are not required.
What is the function of the CLR pin on SN74AS174DRG4?
The CLR (clear) pin on SN74AS174DRG4 is an asynchronous, active-low input that forces all six Q outputs to logic low regardless of clock state or data inputs. It requires no clock edge to take effect and remains effective as long as CLR is held low. This feature enables immediate register reset during system initialization or fault recovery in the SN74AS174DRG4.
Can SN74AS174DRG4 operate at 3.3 V?
No, the SN74AS174DRG4 is specified only for 4.5 V to 5.5 V supply operation. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are designed for 5 V TTL compatibility. Operating at 3.3 V may result in undefined logic states, marginal noise margins, or failure to meet timing specifications - the SN74AS174DRG4 is not characterized or guaranteed for 3.3 V use.
Is SN74AS174DRG4 RoHS compliant?
Yes, SN74AS174DRG4 is RoHS compliant, with lead finish NIPDAU (nickel/palladium/gold) and MSL Level-2-260°C-1 year rating per TI's packaging documentation. It meets JEDEC J-STD-020 moisture sensitivity requirements and is suitable for lead-free reflow soldering processes used in modern electronics manufacturing.
SN74AS174DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 100 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2mA, 20mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 45 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74AS174DRG4 FAQ
1.How can I place an order for SN74AS174DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS174DRG4 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 SN74AS174DRG4 reliable?
The price and inventory of SN74AS174DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS174DRG4 is usually 5 days.
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SN74AS174DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS174DRG4 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 SN74AS174DRG4?
For technical support, including SN74AS174DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS174DRG4 requirements.
6.How does Aetrix verify that SN74AS174DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS174DRG4 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 SN74AS174DRG4 meets industry standards.
7.What is the process for return or replacement of SN74AS174DRG4?
All SN74AS174DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS174DRG4, 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 SN74AS174DRG4 part is unused and in its original packaging.
Return procedure for SN74AS174DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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