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NXP Semiconductors 74ABT823D,623
- Part No.:
- 74ABT823D,623
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT823D,623.pdf
- Description:
- IC FF D-TYPE SNGL 9BIT 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,329
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Product details
Overview
74ABT823D,623 from NXP Semiconductors is a 9-bit positive-edge-triggered D-type flip-flop register with master reset (MR), clock enable (CE), and 3-state outputs-designed for high-speed parity bus interfacing in multi-microprocessor systems. It delivers 125 MHz maximum clock frequency, ±32 mA/±64 mA output drive, and operates across −40 °C to +85 °C in SO24 package.
For engineers reviewing the 74ABT823D,623 datasheet, 74ABT823D,623 pinout, 74ABT823D,623 application, or 74ABT823D,623 equivalent, key selection criteria include its 9-bit buffered register architecture, power-on 3-state behavior, low propagation delay (tPLH/tPHL ≤ 6.8 ns), and compatibility with 5 V TTL-level buses carrying parity data.
Technical Context
The 74ABT823D,623 implements nine independent edge-triggered D flip-flops sharing a common rising-edge clock (CP), active-low master reset (MR), and active-low clock enable (CE). Its 3-state outputs are controlled by an active-low output enable (OE) input, enabling bus-sharing without external buffers.
It uses BiCMOS technology to achieve high-speed operation (fmax = 125 MHz at −40 °C to +85 °C) while maintaining TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and robust output drive (IOL = 64 mA, IOH = −32 mA) under 4.5–5.5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 9-bit edge-triggered D-type flip-flop register with MR, CE, and 3-state outputs |
| Max Clock Frequency | 125 MHz over full temperature range (−40 °C to +85 °C) |
| Propagation Delay | tPLH/tPHL ≤ 6.8 ns (CP to Qn, VCC = 5.0 V) |
| Output Drive | 64 mA sink / 32 mA source at VCC = 4.5 V |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL bus systems |
| Operating Temperature | −40 °C to +85 °C - industrial-grade thermal range |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures reliable logic level recognition on 5 V buses |
Pinout & Package
74ABT823D,623 is housed in a plastic small outline package (SO24, SOT137-1) with 24 leads and 7.5 mm body width. Pin 1 is index-marked; leads are gull-wing, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active-low control for 3-state output drivers; enables bus contention avoidance |
| 2–10 (D0–D8) | Data inputs | 9 parallel asynchronous data inputs synchronized on CP rising edge |
| 11 (MR) | Master reset input | Active-low synchronous reset clears all Q outputs to LOW regardless of CP |
| 12 (GND) | Ground reference | 0 V return path for all internal logic and I/O circuits |
| 13 (CP) | Clock pulse input | Rising-edge-triggered sampling point for D inputs into Q outputs |
| 14 (CE) | Clock enable input | Active-low gate controlling whether CP transitions propagate D→Q |
| 15–23 (Q8–Q0) | Data outputs | 9 parallel 3-state outputs; HIGH/LOW driven or high-Z when OE = HIGH |
| 24 (VCC) | Positive supply | Primary 4.5–5.5 V power rail for logic core and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Power-on 3-state | Outputs default to high-impedance at power-up, preventing bus conflicts during system initialization |
| Power-on reset | Internal circuitry ensures defined initial state (Q = LOW) after VCC ramp-up |
| Latch-up protection | Exceeds 500 mA per JESD78B Class II Level A - robust against transient current faults |
| ESD immunity | HBM > 2000 V and MM > 200 V - withstands handling and board assembly stress |
| BiCMOS process | Combines bipolar speed and CMOS low static power - achieves 125 MHz fmax with μA-level ICC in hold mode |
Applications
| Parity Bus Buffering | Multi-MPU Data Path Expansion |
|---|---|
Use Scenario: Adding parity checking to wide address/data buses shared across multiple microprocessors in industrial controllers. IC Role / Device Role / Timing Role: 9-bit registered buffer synchronizing parity bits with main bus timing using shared CP and CE. Use Value: Eliminates discrete buffer ICs; reduces PCB area and signal skew vs. unregistered solutions. |
Use Scenario: Extending data path width beyond native microprocessor bus width in test equipment backplanes. IC Role / Device Role / Timing Role: Edge-triggered register capturing and holding extended address or instruction bits under MR/CE control. Use Value: Enables deterministic timing alignment across heterogeneous MPU clocks via common CP domain. |
| High-Fan-in Bus Interface | TTL-Level System Control Register |
Use Scenario: Driving heavily loaded control lines (e.g., memory select, interrupt request) from low-drive MPU outputs. IC Role / Device Role / Timing Role: Output driver providing 64 mA sink capability while maintaining TTL voltage levels and setup/hold margins. Use Value: Supports up to 16 LSTTL loads per output without external drivers; reduces BOM count. |
Use Scenario: Storing and latching configuration bits (e.g., boot mode, debug enable) in embedded instrumentation firmware. IC Role / Device Role / Timing Role: Synchronous register with MR for hardware-initiated reset and CE for conditional update. Use Value: Provides glitch-free, clock-synchronized control bit storage immune to software race conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit registered buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ABT823DB,118 | SSOP24 package (5.3 mm width); identical electrical specs and pinout | Higher board density required; tighter layout constraints for soldering and rework | Select when footprint space is constrained and SSOP assembly capability exists |
| SN74ABT823N | PDIP24 package; same logic function but higher parasitic capacitance and slower tPLH/tPHL (typ. 5.5 ns vs. 4.3 ns) | Prototyping and through-hole legacy systems only; not suitable for high-frequency routing | Choose only for hand-soldered evaluation or replacement in existing DIP-based designs |
Compared with 74ABT823D,623, the SSOP variant offers identical performance in a smaller footprint but requires finer-pitch assembly, while the PDIP version trades speed and density for mechanical robustness and ease of manual integration - neither is pin-compatible without PCB revision.
Availability
74ABT823D,623 is available at Aetrix Electronics and suitable for industrial control systems, multi-processor computing backplanes, and high-reliability TTL bus expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74ABT823D,623 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 74ABT823D,623 belongs to NXP's ABT-series advanced BiCMOS logic family, engineered specifically for high-speed, low-skew buffering and registration in 5 V TTL-compatible systems with demanding fan-out and timing requirements.
FAQ
What is the primary function of the 74ABT823D,623?
The 74ABT823D,623 is a 9-bit positive-edge-triggered D-type flip-flop register with master reset (MR), clock enable (CE), and 3-state outputs. It captures parallel data on the rising edge of CP and drives it onto 9 outputs, supporting bus sharing and synchronization in multi-processor systems. Its design eliminates need for external buffers in parity bus applications.
Does the 74ABT823D,623 support 3.3 V operation?
No, the 74ABT823D,623 is specified only for 4.5 V to 5.5 V supply operation per Table 5 of the NXP datasheet. It is not 3.3 V tolerant: VIH minimum is 2.0 V, but VCC must be ≥4.5 V for guaranteed functionality and output drive. Using 3.3 V supply risks undefined behavior and violates recommended operating conditions.
How does the master reset (MR) interact with the clock enable (CE) input?
In the 74ABT823D,623, MR is synchronous and overrides CE: when MR is asserted LOW, all Q outputs are forced LOW on the next active CP edge, regardless of CE state. CE only gates CP propagation when MR is deasserted HIGH. This allows coordinated system-wide reset while preserving clock-enable flexibility during normal operation.
What is the significance of "power-on 3-state" for the 74ABT823D,623?
"Power-on 3-state" means the 74ABT823D,623 outputs default to high-impedance (Z) during power-up sequence, preventing bus contention before system firmware initializes OE. This behavior is intrinsic to the device's internal power-on reset circuitry and requires no external components - critical for safe hot-insertion or multi-voltage rail sequencing.
Can the 74ABT823D,623 drive standard LSTTL loads?
Yes, the 74ABT823D,623 can drive up to 16 LSTTL loads per output: its IOL = 64 mA and IOH = −32 mA exceed the LSTTL sink (16 mA) and source (0.4 mA) requirements. Combined with VOH ≥ 2.5 V and VOL ≤ 0.55 V at full load, it maintains valid TTL logic levels across worst-case industrial temperature and voltage conditions.
74ABT823D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- 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, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 9
- Clock Frequency:
- 200 MHz
- Max Propagation Delay @ V, Max CL:
- 6.1ns @ 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-SO
74ABT823D,623 FAQ
1.How can I place an order for 74ABT823D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT823D,623 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 74ABT823D,623 reliable?
The price and inventory of 74ABT823D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT823D,623 is usually 5 days.
3.What payment methods are accepted for 74ABT823D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT823D,623 transactions.
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4.How is shipping managed for 74ABT823D,623?
74ABT823D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT823D,623 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 74ABT823D,623?
For technical support, including 74ABT823D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT823D,623 requirements.
6.How does Aetrix verify that 74ABT823D,623 is sourced from the original manufacturer or authorized distributors?
All 74ABT823D,623 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 74ABT823D,623 meets industry standards.
7.What is the process for return or replacement of 74ABT823D,623?
All 74ABT823D,623 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT823D,623, 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 74ABT823D,623 part is unused and in its original packaging.
Return procedure for 74ABT823D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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