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NXP Semiconductors 74ABT821DB,112
- Part No.:
- 74ABT821DB,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT821DB,112.pdf
- Description:
- IC FF D-TYPE SNGL 10BIT 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:708
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Product details
Overview
74ABT821DB,112 from NXP Semiconductors is a 10-bit, positive-edge-triggered D-type flip-flop with 3-state outputs, designed for high-speed bus interface buffering in wide data/address paths carrying parity. It features 5 V supply operation, ±32 mA/64 mA output drive, and operates across −40 °C to +85 °C in SSOP24 package.
For engineers reviewing the 74ABT821DB,112 datasheet, 74ABT821DB,112 pinout, 74ABT821DB,112 application, or 74ABT821DB,112 equivalent, key selection criteria include edge-triggered register timing (tPLH/tPHL ≤ 6.2 ns), 3-state enable control (OE active LOW), output drive capability (+64 mA sink / −32 mA source), and compatibility with MOS microprocessor buses.
Technical Context
The 74ABT821DB,112 implements ten independent D-type flip-flops synchronized to the rising edge of CP, each feeding a dedicated 3-state buffer. Its BiCMOS architecture enables low static current (ICC ≤ 250 µA) alongside high-speed switching (fmax ≥ 125 MHz).
Output enable (OE) operates independently of clocking: when OE is LOW, registered Q outputs appear on pins Q0–Q9; when OE is HIGH, all outputs enter high-impedance OFF-state regardless of register state. Power-on reset and power-on 3-state ensure deterministic startup behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 10-bit edge-triggered D-type register with independent 3-state output control |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems |
| Propagation Delay (CP→Q) | tPLH/tPHL ≤ 6.2 ns at −40 °C to +70 °C - supports >125 MHz clock rates in industrial temperature range |
| Output Drive | −32 mA (source) / +64 mA (sink) - drives heavily loaded 3-state buses and MOS memory interfaces |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - provides noise margin against TTL-level signals |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade embedded and computing applications |
| ESD Protection | HBM > 2000 V, MM > 200 V - robust handling during board assembly and handling |
Pinout & Package
74ABT821DB,112 is housed in a plastic shrink small outline package (SSOP24) with 24 leads and 5.3 mm body width (SOT340-1). Pin 1 is marked by a notch or dot; the package is lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active LOW control for all 10 outputs; decouples register operation from bus loading |
| 2–11 (D0–D9) | Data inputs | Asynchronous parallel data inputs sampled on rising CP edge |
| 12 (GND) | Ground reference | 0 V return path for logic and output current; must be low-impedance |
| 13 (CP) | Clock pulse input | Positive-edge-triggered register control; minimum pulse width 2.9 ns HIGH / 3.8 ns LOW |
| 14–23 (Q9–Q0) | Data outputs | Registered outputs with 3-state capability; order matches D0–D9 but reversed physical layout |
| 24 (VCC) | Supply voltage | +4.5 V to +5.5 V power rail; requires local 100 nF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Positive-edge-triggered D flip-flops | Ensures synchronous sampling of 10-bit parallel data with precise setup/hold times (tsu = 2.1 ns, th = 1.3 ns) |
| Independent 3-state output control | OE pin disables all outputs simultaneously without affecting internal register state - critical for bus arbitration |
| High-output drive capability | +64 mA sink / −32 mA source enables direct interfacing with MOS memories and microprocessors without external buffers |
| Power-on 3-state and reset | Guarantees outputs remain high-impedance until VCC stabilizes - prevents bus contention during power-up |
| Latch-up protection | Exceeds 500 mA per JESD78B Class II Level A - ensures robustness in noisy industrial environments |
Applications
| Memory Interface Buffering | Parity Bus Expansion |
|---|---|
Use Scenario: Expanding address/data bus width in 80x86 or Z80-based systems requiring parity checking across wider paths. IC Role / Device Role / Timing Role: Acts as a buffered 10-bit register stage between CPU and parity-generation logic or extended memory banks. Use Value: Eliminates need for discrete latch + buffer combinations; reduces PCB area and signal skew across 10-bit paths. |
Use Scenario: Adding parity bits to 32-bit or 64-bit data buses in industrial controllers where ECC is not required but fault detection is. IC Role / Device Role / Timing Role: Captures and holds parity bits generated by XOR networks, synchronizing them with main data transfers. Use Value: Provides edge-aligned, 3-state-controllable parity outputs that co-timing with main bus cycles - avoids timing violations in legacy designs. |
| Microprocessor Bus Isolation | Legacy System Data Path Extension |
Use Scenario: Isolating peripheral I/O registers from shared data buses in multi-master embedded systems using MOS microprocessors. IC Role / Device Role / Timing Role: Serves as a bi-directional bus interface register with OE-controlled tristate - enables clean bus handoff between masters. Use Value: High sink/source drive (+64 mA/−32 mA) maintains signal integrity across long traces; fast propagation (<6.2 ns) preserves timing margins. |
Use Scenario: Upgrading vintage test equipment or telecom line cards with wider data paths while retaining existing 5 V logic architecture. IC Role / Device Role / Timing Role: Functions as a drop-in replacement for older 74-series latches (e.g., 74LS374) with enhanced speed and drive strength. Use Value: Maintains pin-compatible layout with 74ABT374A family while delivering 2× higher fmax and 4× stronger output drive - extends system lifetime without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit registered bus interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ABT821D,118 | Same logic function and timing, but in SO24 package (7.5 mm width vs. 5.3 mm) | Requires larger PCB footprint; better thermal dissipation in high-power-density layouts | Select when board space allows and thermal management is prioritized over miniaturization |
| SN74ABT821DBR | Texas Instruments variant; identical pinout, timing, and drive specs; different marking and packaging logistics | No functional difference; TI's version may offer alternate volume pricing or regional availability | Choose based on supply chain preference - fully interoperable in design and layout |
Compared with 74ABT821D,118 and SN74ABT821DBR, the 74ABT821DB,112 offers identical electrical performance in a space-constrained SSOP24 package, making it optimal for compact industrial controllers where board real estate is limited but 5 V bus buffering remains essential.
Availability
74ABT821DB,112 is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and embedded microprocessor bus expansion requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for 74ABT821DB,112 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in high-performance logic, automotive, and secure connectivity solutions.
The 74ABT821DB,112 belongs to NXP's ABT (Advanced BiCMOS Technology) logic family, engineered for high-speed, low-power 5 V digital interfacing in industrial and computing applications where timing precision and bus drive strength are critical.
FAQ
What is the maximum clock frequency supported by the 74ABT821DB,112?
The 74ABT821DB,112 supports a maximum clock frequency of 125 MHz over the full industrial temperature range (−40 °C to +70 °C), with typical operation up to 185 MHz at 25 °C. This is enabled by its BiCMOS architecture and propagation delays as low as 4.1 ns (tPLH/tPHL typ). The 74ABT821DB,112 achieves this while maintaining full 5 V operation and 3-state control.
Does the 74ABT821DB,112 have power-on reset functionality?
Yes, the 74ABT821DB,112 includes built-in power-on reset behavior: outputs default to high-impedance (Z) state until VCC reaches valid operating levels, preventing bus contention during power-up. This feature is intrinsic to the 74ABT821DB,112's design and requires no external circuitry.
Can the 74ABT821DB,112 drive standard MOS memory devices directly?
Yes, the 74ABT821DB,112 is explicitly designed to drive MOS memories and microprocessors, with output drive capability of +64 mA (sink) and −32 mA (source). Its 3-state outputs and fast enable/disable timing (tPZH ≤ 5.3 ns) allow clean interfacing with dynamic and static RAM address/data buses without additional buffers.
What is the pin configuration difference between 74ABT821DB,112 and 74ABT374A?
The 74ABT821DB,112 is a 10-bit buffered version of the 74ABT374A (8-bit), sharing identical control logic (CP, OE), edge-triggering, and 3-state architecture. Physically, it uses 24-pin SSOP versus the 20-pin SO/TSSOP of 74ABT374A, adding two extra data I/O pairs (D8/D9 and Q8/Q9) and relocating Q outputs to pins 14–23 in reverse order.
Is the 74ABT821DB,112 compatible with 3.3 V logic systems?
No, the 74ABT821DB,112 is specified only for 4.5 V to 5.5 V operation and is not 3.3 V tolerant. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output voltage levels (VOH ≥ 2.5 V at 4.5 V) are optimized for 5 V TTL/CMOS systems. Interfacing with 3.3 V logic requires level-shifting circuitry for the 74ABT821DB,112 to operate reliably.
74ABT821DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 10
- Clock Frequency:
- 185 MHz
- Max Propagation Delay @ V, Max CL:
- 6.2ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 250 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
74ABT821DB,112 FAQ
1.How can I place an order for 74ABT821DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT821DB,112 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 74ABT821DB,112 reliable?
The price and inventory of 74ABT821DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT821DB,112 is usually 5 days.
3.What payment methods are accepted for 74ABT821DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT821DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT821DB,112?
74ABT821DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT821DB,112 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 74ABT821DB,112?
For technical support, including 74ABT821DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT821DB,112 requirements.
6.How does Aetrix verify that 74ABT821DB,112 is sourced from the original manufacturer or authorized distributors?
All 74ABT821DB,112 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 74ABT821DB,112 meets industry standards.
7.What is the process for return or replacement of 74ABT821DB,112?
All 74ABT821DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT821DB,112, 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 74ABT821DB,112 part is unused and in its original packaging.
Return procedure for 74ABT821DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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