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Texas Instruments SN74ALS876ADWR
- Part No.:
- SN74ALS876ADWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS876ADWR.pdf
- Description:
- IC FF D-TYPE DUAL 4BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,892
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Product details
Overview
SN74ALS876ADWR 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 buffering and I/O port expansion. It features asynchronous preset (PRE) inputs, true bus-structured pinout, 30 MHz max clock frequency, 24-pin SOIC (DW) package, and operates from 0°C to 70°C.
For engineers reviewing the SN74ALS876ADWR datasheet, SN74ALS876ADWR pinout, SN74ALS876ADWR application, or SN74ALS876ADWR equivalent, this page delivers verified functional identity, confirmed timing behavior, validated bus-driver capability, and precise substitution guidance for legacy TTL-compatible system upgrades.
Technical Context
This device implements two independent 4-bit D-type registers, each with separate clock (CLK), preset (PRE), output-enable (OE), and inverting Q outputs. Data is latched on the low-to-high transition of CLK; asserting PRE low forces all four Q outputs low regardless of clock state.
Its 3-state outputs support direct bus driving with bus-structured pinout (e.g., 1D1–1D4 adjacent to 1Q1–1Q4), enabling clean signal routing in backplane or parallel interface designs. The SOIC (DW) package supports surface-mount assembly while maintaining compatibility with legacy 74-series logic footprints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS) TTL - ensures 5 V compatibility, reduced power vs standard LS, and robust noise immunity in industrial control buses. |
| Function | Dual 4-bit edge-triggered D flip-flop with inverting Q outputs and asynchronous preset - enables synchronized data capture with immediate output reset capability. |
| Max Clock Frequency | 30 MHz at VCC = 4.5–5.5 V, CL = 50 pF - supports high-speed parallel data transfer in legacy microprocessor peripheral interfaces. |
| Output Drive | IOL = 24 mA / IOH = −2.6 mA - drives standard TTL loads directly without external buffers, suitable for 8-bit or 16-bit data bus termination. |
| Propagation Delay | tPLH/tPHL ≤ 14 ns (CLK to Q), tPHL(PRE) ≤ 19 ns - guarantees deterministic setup/hold timing margins in synchronous bus arbitration logic. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including industrial HMIs and test equipment controllers. |
| Package | 24-pin SOIC (DW), 300-mil width - surface-mount compatible with automated PCB assembly and pinout-aligned replacement of SN74ALS874B/SN74AS876 variants. |
Pinout & Package
SN74ALS876ADWR 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. Pin 1 is located at the top-left corner (quadrant Q1) when viewed from the top with the marking side up and the notch or index mark left-aligned.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13, 24 | Preset (PRE) | Asynchronous active-low input forcing corresponding Q outputs low; independent of clock - enables fast bus release or error recovery. |
| 2, 14 | Output Enable (OE) | Active-low 3-state control for respective 4-bit output group - allows time-multiplexed sharing of common data lines. |
| 3–6, 7–10 | Data Inputs (1D1–1D4, 2D1–2D4) | Parallel D inputs for each 4-bit register - accepts standard TTL-level signals for latch synchronization. |
| 11, 12 | GND / VCC | Power supply reference and 5 V supply pins - decoupling capacitor placement near these pins is critical for noise suppression in high-speed switching. |
| 15–18, 19–22 | Inverting Outputs (2Q1–2Q4, 1Q1–1Q4) | Complementary Q outputs - eliminates need for external inverters when inverted bus signaling is required. |
| 23, 24 | CLK | Edge-triggered clock inputs - rising-edge sensitive; both clocks operate independently for dual-register functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting Q outputs | Eliminates external inverters in applications requiring complemented bus data, reducing component count and propagation delay in memory address latching. |
| Bus-structured pinout | Groups related signals (e.g., 1D1–1D4 adjacent to 1Q1–1Q4) to minimize trace crosstalk and simplify PCB layout for parallel bus interfaces. |
| Asynchronous preset (PRE) | Enables immediate forced output reset without waiting for clock edge - critical for fail-safe bus initialization and watchdog-triggered recovery sequences. |
| 3-state output control | Allows multiple SN74ALS876ADWR devices to share a single data bus without contention, supporting scalable I/O port expansion in microcontroller-based systems. |
| ALS logic family | Delivers 2× speed and 50% lower power than standard LS TTL at equivalent drive strength - extends thermal margin in dense logic arrays. |
Applications
| Industrial PLC I/O Expansion | Legacy Microprocessor Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O capability to a programmable logic controller using an 8-bit data bus and discrete address decoding. IC Role / Device Role / Timing Role: SN74ALS876ADWR acts as a dual-port buffer register, capturing sensor status bits on CLK and presenting them via inverting Q outputs to the CPU data bus under OE control. Use Value: Enables deterministic read/write timing with 14 ns max propagation delay and 30 MHz clock support, ensuring reliable sampling of fast-changing field inputs. | Use Scenario: Interfacing an 8085 or Z80 CPU to external peripherals requiring synchronized data latching and bus isolation. IC Role / Device Role / Timing Role: SN74ALS876ADWR serves as a bidirectional bus transceiver register, using PRE to clear outputs during bus turnaround and OE to gate data flow directionally. Use Value: Provides 24 mA sink current per output - sufficient to drive TTL loads directly without pull-up resistors, simplifying board design and improving noise immunity. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Control |
Use Scenario: Generating repeatable digital stimulus patterns for IC functional testing using a microcontroller-controlled pattern sequencer. IC Role / Device Role / Timing Role: SN74ALS876ADWR functions as a synchronous output latch, holding pattern data stable across multiple clock cycles while PRE resets outputs between test vectors. Use Value: ALS family's 30 MHz max clock rate supports pattern update rates up to 30 MSPS, meeting timing requirements for mid-speed digital IC validation. | Use Scenario: Controlling solenoid valves, relays, and indicator LEDs in an automated manufacturing test fixture with strict timing coordination. IC Role / Device Role / Timing Role: SN74ALS876ADWR operates as a safety-critical output register, where PRE asserts low to de-energize all actuators immediately upon fault detection. Use Value: Asynchronous PRE provides sub-20 ns response - faster than any software-interrupt-driven shutdown, satisfying functional safety timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit D-type register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS874BDWR | Non-inverting Q outputs; CLR instead of PRE; identical pinout, timing, and drive specs. | Requires external inversion for complemented bus data; uses active-low clear rather than preset for forced low outputs. | Select when system logic requires non-inverted register outputs and asynchronous clear behavior aligns with control architecture. |
| SN74AS876DW | Faster 80 MHz max clock; higher drive (IOL = 48 mA); AS family - increased power consumption and noise sensitivity. | Supports higher-speed bus protocols but demands stricter layout controls and tighter power delivery. | Choose only when 30 MHz ALS performance is insufficient and board-level noise mitigation is implemented. |
Compared with SN74ALS876ADWR, SN74ALS874BDWR offers functionally symmetric timing and packaging but inverted logic polarity, while SN74AS876DW trades power efficiency and noise margin for raw speed - making SN74ALS876ADWR optimal for cost-sensitive, thermally constrained, or noise-prone industrial bus applications.
Availability
SN74ALS876ADWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microprocessor bus interface, and automated test fixture control requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74ALS876ADWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
SN74ALS876ADWR belongs to TI's legacy 74ALS logic product line, engineered specifically for high-reliability, 5 V TTL-compatible digital systems requiring low-power operation and robust bus-driving capability in commercial-temperature environments.
FAQ
What is the primary function of the SN74ALS876ADWR?
The SN74ALS876ADWR is a dual 4-bit D-type edge-triggered flip-flop with inverting 3-state outputs and asynchronous preset (PRE) inputs. It functions as a bus-oriented register for synchronized data capture, bidirectional bus driving, and I/O port expansion in 5 V TTL systems. Its design centers on deterministic timing, direct bus loading, and fail-safe output control - all embodied in the SN74ALS876ADWR's architecture.
Does the SN74ALS876ADWR support true 3-state output control?
Yes, the SN74ALS876ADWR provides true 3-state (high-impedance) output control via dedicated active-low Output Enable (OE) inputs for each 4-bit register group. When OE is high, outputs enter high-impedance state regardless of clock or data state - enabling safe bus sharing among multiple SN74ALS876ADWR devices or other bus drivers without contention.
What is the maximum clock frequency supported by the SN74ALS876ADWR?
The SN74ALS876ADWR supports a maximum clock frequency of 30 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF). This specification is validated across the full commercial temperature range (0°C to 70°C) and reflects worst-case propagation delay (tPLH/tPHL ≤ 14 ns) from CLK to Q output transitions.
How does the preset (PRE) input behave in the SN74ALS876ADWR?
The PRE input in the SN74ALS876ADWR is asynchronous and active-low: asserting PRE low forces the corresponding four Q outputs low immediately, independent of the clock signal. This behavior enables rapid bus release, error recovery, or system reset without waiting for a clock edge - a key reliability feature confirmed in the SN74ALS876ADWR's function table and timing diagrams.
Is the SN74ALS876ADWR pin-compatible with other 74-series dual 4-bit registers?
Yes, the SN74ALS876ADWR shares identical 24-pin SOIC (DW) pinout and footprint with SN74ALS874BDWR and SN74AS876DW, including matching CLK, PRE/CLR, OE, D, and Q signal locations. However, logic polarity differs: SN74ALS876ADWR has inverting Q outputs and PRE, whereas SN74ALS874BDWR has non-inverting Q and CLR - requiring schematic review before substitution in the SN74ALS876ADWR design.
SN74ALS876ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 30 MHz
- Max Propagation Delay @ V, Max CL:
- 14ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 21 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ALS876ADWR FAQ
1.How can I place an order for SN74ALS876ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS876ADWR 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 SN74ALS876ADWR reliable?
The price and inventory of SN74ALS876ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS876ADWR is usually 5 days.
3.What payment methods are accepted for SN74ALS876ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS876ADWR transactions.
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4.How is shipping managed for SN74ALS876ADWR?
SN74ALS876ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS876ADWR 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 SN74ALS876ADWR?
For technical support, including SN74ALS876ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS876ADWR requirements.
6.How does Aetrix verify that SN74ALS876ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS876ADWR 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 SN74ALS876ADWR meets industry standards.
7.What is the process for return or replacement of SN74ALS876ADWR?
All SN74ALS876ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS876ADWR, 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 SN74ALS876ADWR part is unused and in its original packaging.
Return procedure for SN74ALS876ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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