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Texas Instruments SN74AS175BDR
- Part No.:
- SN74AS175BDR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AS175BDR.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,696
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Product details
Overview
SN74AS175BDR from Texas Instruments is a quad D-type flip-flop with complementary (Q and Q̅) outputs, direct-clear input, and positive-edge clock triggering. It operates at 5 V, delivers 20 mA sink current, supports 100 MHz clock frequency, and features fully buffered outputs for noise immunity in TTL-compatible digital systems-used in synchronous data latching within industrial control registers.
For engineers reviewing the SN74AS175BDR datasheet, SN74AS175BDR pinout, SN74AS175BDR application, or SN74AS175BDR equivalent, this page provides verified functional specifications, SOIC-16 package layout, timing-critical design values (tsu = 3 ns, tPLH = 3 ns), and validated drop-in alternatives for register-level logic upgrades.
Technical Context
This device implements four independent edge-triggered D flip-flops using advanced Schottky (AS) TTL circuitry. Each stage includes buffered CLK and CLR inputs, dual-rail outputs (Q/Q̅), and meets strict setup/hold timing requirements for reliable state capture on the rising clock edge.
It is not a 3-state device and lacks output enable logic; all outputs are actively driven high or low. Its electrical interface is strictly TTL-compatible-VIH = 2 V, VIL = 0.8 V-with no CMOS-level thresholds or rail-to-rail operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS TTL - ensures compatibility with legacy TTL systems and higher speed than ALS/LS families |
| Flip-Flop Count & Type | 4 independent positive-edge-triggered D-type flip-flops with true/complement outputs per stage |
| Max Clock Frequency | 100 MHz - enables high-speed synchronous data capture in pipeline and buffering applications |
| Output Drive Strength | 20 mA sink (IOL), –2 mA source (IOH) - sufficient to drive multiple TTL loads without external buffers |
| Setup/Hold Times | tsu = 3 ns, th = 1 ns - tight timing window demands precise PCB routing and clock skew control |
| Supply Voltage Range | 4.5 V to 5.5 V - requires stable 5 V rail; not tolerant of undervoltage or overvoltage conditions |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for non-military embedded and industrial equipment |
Pinout & Package
SN74AS175BDR is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 7.5 mm width, and JEDEC-standard footprint. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous clear - resets all four Q outputs to LOW regardless of clock state |
| 2 | 1Q | True output of first flip-flop - synchronized to CLK↑, reflects D1 input after propagation delay |
| 3 | 1Q̅ | Complement output of first flip-flop - always inverse of 1Q; used for differential signaling or logic inversion |
| 4 | 1D | Data input for first flip-flop - must be stable ≥3 ns before CLK↑ for reliable sampling |
| 5 | 2D | Data input for second flip-flop - independently controlled; no internal inter-stage coupling |
| 6 | 2Q̅ | Complement output of second flip-flop - electrically identical to 1Q̅ but sourced from second stage |
| 7 | 2Q | True output of second flip-flop - matches 2D value one clock cycle after valid setup |
| 8 | GND | Power ground reference - must be low-impedance connection to minimize switching noise coupling |
| 9 | 3Q | True output of third flip-flop - occupies same relative position as 1Q/2Q in pinout symmetry |
| 10 | 3Q̅ | Complement output of third flip-flop - maintains consistent Q/Q̅ pairing across all stages |
| 11 | 3D | Data input for third flip-flop - routed separately; no shared bus or internal fanout |
| 12 | 4D | Data input for fourth flip-flop - final D input in sequence; completes quad configuration |
| 13 | 4Q̅ | Complement output of fourth flip-flop - provides full set of eight outputs (4×Q + 4×Q̅) |
| 14 | 4Q | True output of fourth flip-flop - last output in standard pin order; used for end-of-register readout |
| 15 | CLK | Common clock input - positive-edge sensitive; all four stages update simultaneously on CLK↑ |
| 16 | VCC | +5 V supply - bypass capacitor (0.1 µF ceramic) required near pin for transient current handling |
Key Features
| Feature | Design Value |
|---|---|
| Complementary outputs per stage | Each of four D flip-flops provides both Q and Q̅ - eliminates need for external inverters in toggle or differential logic |
| Fully buffered inputs and outputs | High noise immunity and consistent drive strength across temperature - reduces susceptibility to crosstalk in dense layouts |
| 100 MHz maximum clock rate | Enables use in high-throughput data acquisition and real-time control loops where sub-10 ns timing margins are critical |
| Direct-clear (asynchronous reset) | Single-pin global reset - allows deterministic initialization of all four registers without clock dependency or sequencing |
| TTL-compatible voltage thresholds | VIH = 2 V, VIL = 0.8 V - interoperable with 74LS, 74ALS, and other bipolar TTL families without level-shifting |
Applications
| Industrial PLC Register Bank | Digital Pattern Generator |
|---|---|
Use Scenario: Storing and synchronizing I/O status bits in programmable logic controller backplanes with parallel bus interfaces. IC Role / Device Role / Timing Role: Quad D flip-flop acting as a 4-bit latch bank, capturing sensor or actuator states on system clock edges. Use Value: Complementary outputs allow direct connection to LED indicators or opto-isolators without added inverters; 100 MHz capability supports fast scan cycles. |
Use Scenario: Generating repeating binary sequences (e.g., 00110100) for test signal injection into communication PHY layers. IC Role / Device Role / Timing Role: Synchronous state element in shift-register-based pattern engines, clocked by FPGA-generated timing signals. Use Value: Tight 3 ns setup time enables reliable operation at 100 MHz, matching high-speed serial link test clocks without timing closure issues. |
| Legacy Bus Interface Buffer | Asynchronous Reset Controller |
Use Scenario: Isolating and retiming address/data lines between mismatched bus segments (e.g., microcontroller to older peripheral ASIC). IC Role / Device Role / Timing Role: Edge-triggered register providing setup/hold margin and noise filtering for wide parallel buses. Use Value: Fully buffered I/O suppresses ground bounce and EMI-induced glitches; 20 mA drive sustains signal integrity over 15 cm traces. |
Use Scenario: Coordinating power-on reset sequencing across multiple ICs requiring simultaneous initialization. IC Role / Device Role / Timing Role: Distribution node for active-low asynchronous clear, driving CLR inputs of multiple downstream registers. Use Value: Single-pin global reset ensures deterministic startup state across all four stages - critical for fail-safe system boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS175DR | ALS family: lower speed (50 MHz max), reduced drive (8 mA IOL), higher tsu (10 ns) | Suitable for cost-sensitive, lower-frequency designs where 100 MHz timing is unnecessary | Select when power consumption and board space are constrained, and system clock ≤40 MHz |
| SN74AS174DR | Hex (6-stage) variant with single-rail outputs only - no Q̅ pins; identical speed and drive specs | Used where more flip-flops are needed but complement outputs are not required | Choose when expanding register count without doubling output wiring; note pinout incompatibility |
Compared with SN74ALS175DR, SN74AS175BDR delivers twice the clock speed and 2.5× stronger sink current, enabling faster data throughput; versus SN74AS174DR, it trades two extra flip-flops for guaranteed Q/Q̅ pairs essential in differential logic paths.
Availability
SN74AS175BDR is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interface modules, and digital test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS175BDR 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 U.S.-based semiconductor company founded in 1930, specializing in analog and embedded processing technologies with broad industrial, automotive, and communications product portfolios.
The SN74AS175BDR belongs to TI's 74AS logic family, designed specifically for high-speed, noise-immune TTL-compatible digital systems where timing precision and output drive exceed standard LS/ALS capabilities.
FAQ
What is the maximum clock frequency supported by SN74AS175BDR?
The SN74AS175BDR supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF). This value is confirmed in the switching characteristics table of the SDAS207E datasheet and applies to both commercial (SN74) and military (SN54) versions. Operation above this frequency risks metastability or incorrect state capture.
Does SN74AS175BDR have 3-state outputs?
No, SN74AS175BDR does not feature 3-state outputs. All eight outputs (four Q and four Q̅) are actively driven high or low at all times when powered. There is no output-enable (OE) pin or internal tri-state control logic - the device functions exclusively as a set of four hard-wired D flip-flops.
What is the function of pin 3 (1Q̅) on SN74AS175BDR?
Pin 3 on SN74AS175BDR is the complement output (1Q̅) of the first D flip-flop. It provides the logical inverse of pin 2 (1Q) and is updated synchronously on the positive edge of CLK. This dual-rail output enables direct implementation of XOR gates, toggle functions, or differential signaling without external inverters.
Can SN74AS175BDR be used as a replacement for SN74ALS175DR?
SN74AS175BDR can replace SN74ALS175DR in most pin-compatible designs, but only if the system accommodates higher supply current (34 mA vs. 14 mA), tighter timing margins (3 ns setup vs. 10 ns), and identical SOIC-16 footprint. Voltage thresholds and logic levels remain compatible, but clock distribution must meet AS-family timing constraints.
What is the recommended bypass capacitor for SN74AS175BDR?
A 0.1 µF ceramic capacitor is recommended between VCC (pin 16) and GND (pin 8) as close as possible to the SN74AS175BDR package. This minimizes high-frequency supply noise caused by rapid current transients during output switching, especially critical given the device's 100 MHz capability and 20 mA output drive strength.
SN74AS175BDR 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:
- Complementary
- Number of Elements:
- 1
- Number of Bits per Element:
- 4
- 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):
- 34 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74AS175BDR FAQ
1.How can I place an order for SN74AS175BDR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS175BDR 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 SN74AS175BDR reliable?
The price and inventory of SN74AS175BDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS175BDR is usually 5 days.
3.What payment methods are accepted for SN74AS175BDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS175BDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS175BDR?
SN74AS175BDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS175BDR 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 SN74AS175BDR?
For technical support, including SN74AS175BDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS175BDR requirements.
6.How does Aetrix verify that SN74AS175BDR is sourced from the original manufacturer or authorized distributors?
All SN74AS175BDR 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 SN74AS175BDR meets industry standards.
7.What is the process for return or replacement of SN74AS175BDR?
All SN74AS175BDR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS175BDR, 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 SN74AS175BDR part is unused and in its original packaging.
Return procedure for SN74AS175BDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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