My Inquiry
My Account
Texas Instruments SN74AS876DW
- Part No.:
- SN74AS876DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS876DW.pdf
- Description:
- IC FF D-TYPE DUAL 4BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,476
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AS876DW from Texas Instruments is a dual 4-bit D-type edge-triggered flip-flop with inverting 3-state outputs, designed as a bus-oriented register for bidirectional data flow control. It features asynchronous preset (PRE), clock-triggered data capture on CLK↑, and supports 80 MHz maximum clock frequency at 5 V with 48 mA sink capability per output. It operates from 0°C to 70°C and is packaged in a 24-pin SOIC (DW) for high-density PCB layouts.
For engineers reviewing the SN74AS876DW datasheet, SN74AS876DW pinout, SN74AS876DW application, or SN74AS876DW equivalent, this page delivers verified functional identity, bus-driver-specific timing behavior, true inverting Q-output logic, precise 3-state enable/disable timing, and validated alternatives for legacy TTL bus interface upgrades.
Technical Context
The SN74AS876DW implements two independent 4-bit D-type registers, each with separate clock (CLK), preset (PRE), and output-enable (OE) controls. Data is latched on the low-to-high transition of CLK, and PRE asserts asynchronously to force all four Q outputs low regardless of clock state.
Its 3-state outputs use active-low OE to disable both high- and low-drive paths simultaneously, enabling direct connection to shared data buses without external isolation. Propagation delays are tightly specified: tPLH/tPHL ≤ 8.5 ns (CLK to Q), tPHL ≤ 9.5 ns (PRE to Q), and tPZH/tPLZ ≤ 7 ns (OE to Q), confirming suitability for high-speed synchronous bus arbitration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual 4-bit D-type flip-flop with inverting Q outputs and asynchronous PRE |
| Max Clock Frequency | 80 MHz at VCC = 4.5–5.5 V - enables fast synchronous data latching in bus interfaces |
| Output Drive Strength | IOL = 48 mA (low), IOH = −15 mA (high) - drives heavy TTL loads directly without buffers |
| 3-State Enable Timing | tPZH ≤ 7 ns, tPLZ ≤ 7 ns - ensures minimal bus contention during output transitions |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial and computing systems |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails |
| Package | 24-pin SOIC (DW), 300-mil width - surface-mount compatible with automated assembly |
Pinout & Package
SN74AS876DW is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), measuring 7.5 mm × 15.4 mm with 1.27 mm pitch. The pinout follows bus-structured layout optimized for parallel data routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13, 24 | PRE (1PRE, 2PRE) | Asynchronous preset inputs - drive corresponding Q outputs low independently of CLK |
| 2, 14 | OE (1OE, 2OE) | Active-low 3-state output enables - disable outputs to high-impedance state for bus sharing |
| 3–6, 7–10 | D1–D4 (two groups) | Data inputs for each 4-bit register - sampled on CLK↑ rising edge |
| 11, 23 | CLK (1CLK, 2CLK) | Clock inputs - trigger edge-sensitive latching of D inputs to Q outputs |
| 12 | GND | Ground reference - common return for all internal logic and output drivers |
| 22 | VCC | Positive supply - powers internal logic and output stages at 4.5–5.5 V |
| 15–18, 19–22 | Q1–Q4 (two groups, inverted) | Inverting registered outputs - Q = NOT(D) after CLK↑ when PRE and OE are inactive |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct bidirectional bus interfacing with automatic signal polarity inversion and contention-free tri-state control |
| Asynchronous preset (PRE) | Resets all four Q outputs to low immediately-critical for power-up initialization and fault recovery in bus systems |
| Bus-structured pinout | Groups D and Q pins by bit position across both registers-simplifies PCB trace routing and reduces crosstalk in parallel data paths |
| High-speed 80 MHz operation | Supports real-time data capture in fast microprocessor address/data latching and FIFO buffer applications |
| SOIC (DW) packaging | 24-pin surface-mount footprint with JEDEC-standard dimensions-enables high-density placement and reflow compatibility |
Applications
| Microprocessor Address Latching | Parallel I/O Port Expansion |
|---|---|
Use Scenario: Capturing and holding 8-bit address bus signals from a microprocessor during memory access cycles. IC Role / Device Role / Timing Role: Dual 4-bit register providing synchronized, inverting storage of upper/lower address nibbles with simultaneous 3-state bus release. Use Value: Eliminates need for discrete inverters and enables clean address hold timing with <8.5 ns CLK→Q delay and sub-7 ns OE disable. |
Use Scenario: Expanding GPIO capability in an embedded controller by adding an 8-bit bidirectional data port. IC Role / Device Role / Timing Role: Bus driver/register that buffers host data and presents it to peripherals via controlled 3-state outputs. Use Value: Delivers 48 mA sink per line for driving LEDs or optocouplers, while PRE allows hardware reset of all port bits without software intervention. |
| Legacy TTL Bus Arbitration | Industrial Control Data Buffering |
Use Scenario: Interfacing modern controllers to legacy TTL-based backplane systems requiring strict voltage and timing compliance. IC Role / Device Role / Timing Role: Level-shifting and timing-compliant bus interface IC with guaranteed VIH/VIL thresholds and 0.8 V VIL for robust noise immunity. Use Value: Meets AS-series input thresholds and delivers 2.4 V VOH at −15 mA, ensuring reliable recognition by older TTL receivers. |
Use Scenario: Isolating sensor acquisition data from noisy PLC backplanes using synchronized sampling and buffered output. IC Role / Device Role / Timing Role: Synchronized data latch that captures analog-to-digital converter outputs and holds them for safe readout. Use Value: Asynchronous PRE allows immediate clearing of stale data upon fault detection, while 3-state outputs prevent bus conflicts during diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit bus-register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS876A | Slower max clock (30 MHz), lower drive (24 mA sink), higher setup time (10 ns vs. 4.5 ns) | Suitable only for low-speed legacy systems where timing margin is ample | Select when cost sensitivity outweighs speed requirements and existing ALS design reuse is prioritized |
| SN74AS874DW | True (non-inverting) Q outputs; identical timing, drive, and package | Used where output polarity must match input without external inversion | Choose when system logic requires non-inverted registered outputs - same footprint and timing, no layout change |
Compared with SN74ALS876A, SN74AS876DW offers 2.7× higher clock rate and 2× stronger drive, making it essential for real-time bus interfaces; versus SN74AS874DW, it provides complementary logic polarity for systems requiring inverted register outputs without added gates.
Availability
SN74AS876DW is available at Aetrix Electronics and suitable for microprocessor address latching, parallel I/O expansion, legacy TTL bus arbitration, and industrial control data buffering requiring stable component supply across long-lifecycle production programs.
Supply support for SN74AS876DW 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 SN74AS876DW belongs to TI's Advanced Schottky (AS) logic family, engineered for high-speed, low-power 5 V TTL-compatible digital interfacing in demanding bus and register applications.
FAQ
What is the primary function of the SN74AS876DW?
The SN74AS876DW is a dual 4-bit D-type edge-triggered flip-flop with inverting 3-state outputs, designed specifically as a bus-oriented register. It latches data on the rising edge of CLK, provides asynchronous preset (PRE) to force Q outputs low, and uses active-low OE to place outputs in high-impedance state-enabling direct integration into shared data bus architectures without external logic.
Does the SN74AS876DW support 5 V TTL-compatible signaling?
Yes, the SN74AS876DW is fully 5 V TTL-compatible. Its recommended operating conditions specify VCC = 4.5 V to 5.5 V, VIH = 2 V minimum, VIL = 0.8 V maximum, VOH = 2.4 V at −15 mA, and VOL = 0.5 V at 48 mA-meeting or exceeding standard TTL voltage thresholds and drive requirements for seamless interoperability with legacy and modern 5 V logic systems.
What is the role of the PRE pin on the SN74AS876DW?
The PRE (preset) pin on the SN74AS876DW is an asynchronous active-low input that forces all four Q outputs of its respective register to logic low, independent of the clock signal. This function enables immediate hardware-level reset of stored data-critical for power-on initialization, error recovery, or bus arbitration protocols where deterministic output state is required prior to clock activation.
Can the SN74AS876DW replace the SN74ALS876A in an existing design?
The SN74AS876DW can replace the SN74ALS876A pin-for-pin and functionally, but with key performance upgrades: 80 MHz vs. 30 MHz max clock, 48 mA vs. 24 mA output sink, and faster propagation delays (≤8.5 ns vs. ≤14 ns). Electrical compatibility is maintained, but designers must verify timing margins and power delivery due to higher ICC (up to 160 mA vs. 31 mA) under full drive conditions.
What package type is used for the SN74AS876DW?
The SN74AS876DW is supplied in a 24-pin plastic small-outline integrated circuit (SOIC) package designated DW, with 300-mil body width, 1.27 mm lead pitch, and JEDEC-standard dimensions (7.5 mm × 15.4 mm). This surface-mount package supports automated placement and reflow soldering, and is documented in TI's mechanical drawing MCER004A.
SN74AS876DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Clock Frequency:
- 80 MHz
- Max Propagation Delay @ V, Max CL:
- 10.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 142 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74AS876DW FAQ
1.How can I place an order for SN74AS876DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS876DW 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 SN74AS876DW reliable?
The price and inventory of SN74AS876DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS876DW is usually 5 days.
3.What payment methods are accepted for SN74AS876DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS876DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS876DW?
SN74AS876DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS876DW 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 SN74AS876DW?
For technical support, including SN74AS876DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS876DW requirements.
6.How does Aetrix verify that SN74AS876DW is sourced from the original manufacturer or authorized distributors?
All SN74AS876DW 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 SN74AS876DW meets industry standards.
7.What is the process for return or replacement of SN74AS876DW?
All SN74AS876DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS876DW, 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 SN74AS876DW part is unused and in its original packaging.
Return procedure for SN74AS876DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AS876DW Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
