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Texas Instruments SN74AS4374BNS
- Part No.:
- SN74AS4374BNS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74AS4374BNS.pdf
- Description:
- IC D-TYPE POS TRG SNGL 20SO
- Quantity:
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Inventory:720
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Product details
Overview
SN74AS4374BNS from Texas Instruments is an 8-bit edge-triggered D-type flip-flop with 3-state outputs, designed for driving high-capacitance or low-impedance bus lines. It operates from 0°C to 70°C, supports 125 MHz clock frequency, delivers ±48 mA output drive, and features dual-edge data registration requiring two clock cycles for D-to-Q propagation.
For engineers reviewing the SN74AS4374BNS datasheet, SN74AS4374BNS pinout, SN74AS4374BNS application, or SN74AS4374BNS equivalent, key selection criteria include 3-state bus-driving capability, TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), high-speed timing (tPLH/tPHL ≤ 8 ns), and SO-20 (NS) package compatibility with industrial I/O port and register-buffer designs.
Technical Context
The SN74AS4374BNS implements eight independent D-type flip-flops triggered on the second positive clock edge, not the first - a unique double-clock-cycle latency confirmed in the function table and timing diagram. Its 3-state outputs are controlled exclusively by OE, which has no effect on internal storage, enabling concurrent data retention or update while outputs remain high-impedance.
This device belongs to the advanced Schottky (AS) logic family, delivering higher speed and lower power than standard TTL, with guaranteed operation at VCC = 4.5 V to 5.5 V and specified IOL = 48 mA / IOH = −15 mA drive strength. All timing parameters (tsu = 4 ns, th = 1 ns, tw = 4 ns) are validated under CL = 50 pF load conditions per JEDEC-standard test setup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky (AS) TTL - enables 125 MHz max clock frequency with reduced power vs. standard TTL |
| Function | 8-bit D-type flip-flop with 3-state outputs - supports bidirectional bus buffering and register staging |
| Propagation Delay | tPLH/tPHL ≤ 8 ns at VCC = 4.5–5.5 V, CL = 50 pF - ensures sub-8-ns signal path timing for high-speed control logic |
| Output Drive | IOL = 48 mA, IOH = −15 mA - directly drives heavy capacitive loads (e.g., >100 pF buses) without external buffers |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and industrial control panels |
| Supply Voltage | VCC = 4.5 V to 5.5 V - compatible with standard 5 V rail with ±10% tolerance margin |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - TTL-compatible interface with legacy microcontrollers and peripheral ICs |
Pinout & Package
SN74AS4374BNS is supplied in a 20-pin plastic small-outline (SO-20, package drawing NS), 300-mil body width, with gull-wing leads and RoHS-compliant CU NIPDAU finish. Moisture sensitivity level is Level-1 (260°C peak reflow, unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1Q–8Q (Pins 1–4, 6–9) | 3-State Output | Individually buffered Q outputs; high-impedance when OE is high - enables shared bus arbitration |
| 1D–8D (Pins 11–14, 16–19) | Data Input | Asynchronous D inputs latched on second CLK↑ - supports pipelined data staging |
| CLK (Pin 10) | Clock Input | Positive-edge-triggered; initiates sampling only on second rising edge - prevents premature capture |
| OE (Pin 20) | Output Enable | Active-low 3-state control; independent of internal latch state - allows dynamic bus release |
| VCC (Pin 15) | Power Supply | +4.5 V to +5.5 V supply rail - powers all eight flip-flops and output drivers |
| GND (Pin 5) | Ground Reference | Common return for logic and output stages - critical for noise immunity in bus applications |
Key Features
| Feature | Design Value |
|---|---|
| Double-clock-cycle D-to-Q latency | Ensures deterministic two-cycle pipeline delay - eliminates race conditions in synchronous register chains |
| Independent OE control | Permits real-time bus disconnection without disturbing stored data - essential for hot-swap I/O ports |
| High-current 3-state outputs | 48 mA sink capability supports direct connection to long PCB traces or multiple TTL inputs without fanout buffers |
| TTL-compatible input thresholds | 2 V VIH / 0.8 V VIL enables seamless interfacing with legacy 5 V microcontrollers and peripherals |
| AS-family speed-power balance | 125 MHz operation with typical ICC = 100–150 mA - achieves faster switching than LS-TTL at comparable power |
Applications
| Industrial I/O Port Expansion | Legacy Bus Interface Buffering |
|---|---|
Use Scenario: Expanding GPIO count on PLC backplanes where microcontroller pins are limited and bus capacitance exceeds 80 pF. IC Role / Device Role / Timing Role: Acts as an 8-bit synchronized output latch with 3-state control, isolating CPU bus from field-side loads during configuration changes. Use Value: Eliminates need for discrete buffer arrays; 48 mA drive handles relay coil transients and long ribbon-cable runs without signal degradation. |
Use Scenario: Interfacing modern FPGA-based controllers to legacy ISA or VME bus peripherals operating at 5 V TTL levels. IC Role / Device Role / Timing Role: Serves as a direction-controlled bidirectional data register, synchronizing asynchronous peripheral reads/writes to system clock domain. Use Value: Double-clock latency provides stable setup/hold margins across variable peripheral response times; OE enables clean bus turnaround. |
| High-Speed Register File Staging | Test Equipment Data Capture |
Use Scenario: Building multi-stage pipeline registers in automated test equipment where intermediate results must be held before final computation. IC Role / Device Role / Timing Role: Functions as a clock-domain crossing stage with deterministic two-cycle delay, decoupling fast acquisition logic from slower processing blocks. Use Value: Guaranteed tPLH/tPHL ≤ 8 ns and tsu = 4 ns enable reliable 125 MHz staging - outperforming standard 74LS series by >3× speed. |
Use Scenario: Capturing parallel digital waveforms from DUTs in boundary-scan or functional test systems with tight timing windows. IC Role / Device Role / Timing Role: Provides synchronized 8-bit snapshot capture with simultaneous 3-state release to memory bus upon trigger assertion. Use Value: Independent OE allows immediate bus release after capture - reduces test cycle time by eliminating wait states for bus arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit 3-state D-flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS821N | Same AS-family, but non-3-state outputs; no OE pin; fixed Q/Q̅ outputs | Cannot support shared bus architectures - requires external tri-state buffers for multiplexing | Select only when bus isolation is unnecessary and board space permits added buffer ICs |
| SN74ACT574N | CMOS (ACT) family; lower ICC (20 mA typ), wider VCC range (4.5–5.5 V), but IOL = 24 mA only | Insufficient drive for >50 pF loads or multiple TTL inputs; unsuitable for direct bus driving | Prefer for low-power, noise-sensitive environments where external drivers handle bus loading |
Compared with SN74AS4374BNS, SN74AS821N lacks bus arbitration capability due to missing 3-state control, while SN74ACT574N trades drive strength for power efficiency - making SN74AS4374BNS the sole choice for high-capacitance, high-speed, self-contained bus interface applications.
Availability
SN74AS4374BNS is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy bus interfacing, high-speed register staging, and test equipment data capture requiring stable component supply and long-term manufacturability.
Supply support for SN74AS4374BNS 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 SN74AS4374BNS belongs to TI's Advanced Schottky TTL logic portfolio, engineered for high-speed, high-drive digital interface applications where robustness, timing predictability, and direct bus connectivity are critical.
FAQ
What is the clocking behavior of the SN74AS4374BNS, and why does data require two clock cycles to appear at Q?
The SN74AS4374BNS uses a unique double-edge sampling architecture: data presented at the D inputs is latched on the second positive transition of CLK, not the first. This design ensures strict setup/hold compliance and eliminates metastability risks in noisy environments. The two-cycle latency is inherent to the internal circuitry and explicitly defined in the function table - it applies to every SN74AS4374BNS unit regardless of operating conditions.
Does the OE pin affect internal flip-flop operation in the SN74AS4374BNS?
No - the OE pin in the SN74AS4374BNS controls only the output driver stage and has zero effect on internal storage or clocking behavior. While outputs are in high-impedance state (OE = high), the eight flip-flops continue to operate normally: new data can be loaded on subsequent CLK edges, and previously stored values remain intact. This separation enables dynamic bus sharing without disrupting pipeline integrity.
What is the maximum capacitive load the SN74AS4374BNS can drive reliably, and how is this verified?
The SN74AS4374BNS is characterized for CL = 50 pF in all timing specifications (tPLH, tPHL, tPZH, etc.), and its 48 mA output sink current supports sustained drive into loads exceeding 100 pF when combined with proper PCB layout and termination. This capability is validated in the datasheet's switching characteristics table and confirmed by TI's load-circuit test methodology (R1 = R2 = 500 Ω, CL = 50 pF), ensuring real-world bus-driving performance.
Is the SN74AS4374BNS pin-compatible with other 74AS-series 20-pin D-flip-flops like the SN74AS574N?
No - the SN74AS4374BNS has a distinct pinout optimized for 3-state bus operation: Q outputs occupy pins 1–4 and 6–9, D inputs are on pins 11–14 and 16–19, and OE is on pin 20. In contrast, SN74AS574N places Q outputs on pins 1–8 and lacks dedicated OE placement matching SN74AS4374BNS. Direct substitution would cause functional failure due to misrouted signals and missing 3-state control.
What packaging and environmental compliance does the SN74AS4374BNS meet?
The SN74AS4374BNS is supplied in a green (RoHS & no Sb/Br), lead-free SO-20 (NS) package with CU NIPDAU terminations and JEDEC Level-1 moisture sensitivity rating (260°C peak reflow, unlimited floor life). It conforms to TI's Eco Plan requirements and is rated for operation from 0°C to 70°C - making it suitable for commercial and industrial applications with stringent environmental and reliability demands.
SN74AS4374BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AS4374BNS FAQ
1.How can I place an order for SN74AS4374BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS4374BNS 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 SN74AS4374BNS reliable?
The price and inventory of SN74AS4374BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS4374BNS is usually 5 days.
3.What payment methods are accepted for SN74AS4374BNS?
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4.How is shipping managed for SN74AS4374BNS?
SN74AS4374BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS4374BNS 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 SN74AS4374BNS?
For technical support, including SN74AS4374BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS4374BNS requirements.
6.How does Aetrix verify that SN74AS4374BNS is sourced from the original manufacturer or authorized distributors?
All SN74AS4374BNS 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 SN74AS4374BNS meets industry standards.
7.What is the process for return or replacement of SN74AS4374BNS?
All SN74AS4374BNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS4374BNS, 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 SN74AS4374BNS part is unused and in its original packaging.
Return procedure for SN74AS4374BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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