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Texas Instruments SN74AHC573N
- Part No.:
- SN74AHC573N
- Manufacturer:
- Texas Instruments
- Category:
- Latches
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AHC573N.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:681
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Product details
Overview
SN74AHC573N from Texas Instruments is an octal transparent D-type latch with 3-state outputs, designed for bus interface applications in 2V–5.5V systems. It features latch-enable (LE) and output-enable (OE) control, ±25 mA output drive per channel, and operates across –40°C to 125°C. Used in PC motherboard data buses and server memory subsystems for temporary data hold and bus isolation.
For engineers reviewing the SN74AHC573N datasheet, SN74AHC573N pinout, SN74AHC573N application, or SN74AHC573N equivalent, key selection criteria include VCC range compatibility (2–5.5 V), 3-state output timing (tPLH ≤ 8.5 ns at 5 V), thermal resistance (RθJA = 53.3°C/W), and PDIP-20 package suitability for through-hole prototyping and industrial control boards.
Technical Context
The SN74AHC573N implements eight independent D-type latches with synchronous transparent operation: when LE is high, Q follows D; when LE goes low, outputs retain the last D value. Its buffered OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch states.
It uses advanced CMOS AHC logic with overvoltage-tolerant inputs (up to 5.5 V), slow-edge design to suppress output ringing, and balanced drive capability. The device meets JESD17 latch-up immunity (>250 mA), supports mixed-voltage interfacing, and requires no external pull-ups on OE for power-up high-impedance safety when tied to VCC via resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability with 3.3 V and 5 V logic domains and supports down-translation from 5.5 V inputs. |
| Output Drive | ±25 mA per output - sufficient to directly drive standard CMOS/TTL loads without buffers in medium-speed bus applications. |
| Propagation Delay | tPLH/tPHL ≤ 8.5 ns at VCC = 5 V, CL = 15 pF - ensures sub-10 ns timing for 100 MHz bus handshaking in PCs and network switches. |
| Input Voltage Tolerance | VI up to 5.5 V - allows interfacing with higher-voltage controllers while powered from lower VCC (e.g., 3.3 V supply with 5 V GPIO). |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments without derating. |
| Quiescent Current | ICC ≤ 40 µA at VCC = 5.5 V - minimizes standby power in always-on embedded control modules. |
| ESD Rating | HBM ±2000 V - meets IEC 61000-4-2 Level 2 for robustness in manufacturing and field handling. |
Pinout & Package
SN74AHC573N is housed in a 20-pin plastic dual in-line package (PDIP), 25.40 mm × 9.40 mm body size, with through-hole mounting and industry-standard 0.3-inch row spacing. Pin 1 is marked by a notch or dot; pin 10 is GND, pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-low control: drives all eight Q outputs into high-impedance when low; does not affect internal latch state. |
| 2–9 (1D–8D) | Data Inputs | Eight asynchronous data inputs; accept voltages up to 5.5 V regardless of VCC level. |
| 10 (GND) | Ground Reference | Primary return path for all signals and power; must be low-impedance for noise immunity. |
| 11 (LE) | Latch Enable Input | Edge-triggered enable: rising edge not required-Q follows D while LE is high; latches on LE falling edge. |
| 12–19 (8Q–1Q) | 3-State Outputs | Octal buffered outputs with independent sourcing/sinking; high-Z state eliminates bus contention. |
| 20 (VCC) | Power Supply | Single-supply rail (2–5.5 V); requires local 0.1 µF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC operating range | 2 V to 5.5 V supports mixed-voltage system integration and legacy 5 V ↔ modern 3.3 V bridging. |
| Overvoltage-tolerant inputs | Inputs rated to 5.5 V allow direct connection to 5 V microcontrollers even when VCC = 3.3 V. |
| Slow-edge output drivers | Controlled slew rate reduces EMI and output ringing on PCB traces, critical for clean signal integrity in dense layouts. |
| High-impedance 3-state outputs | Enables true bus sharing without external tri-state logic or pull-up resistors-reduces component count and layout area. |
| Latch-up immunity | Exceeds 250 mA per JESD17, ensuring reliability in transient-overstress conditions common in industrial power rails. |
Applications
| PC Motherboard Data Bus | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Latching address/data multiplexed signals between CPU and peripheral ICs during memory read/write cycles. IC Role / Device Role / Timing Role: Acts as a transparent latch to capture and hold 8-bit parallel data during bus arbitration, synchronized to LE and isolated via OE. Use Value: Enables reliable 8-bit data staging without timing skew; ±25 mA drive supports direct connection to multiple downstream registers. | Use Scenario: Isolating sensor input data streams from noisy factory-floor analog front-ends before digitization. IC Role / Device Role / Timing Role: Buffers and holds analog-to-digital converter outputs prior to microcontroller polling, using OE to decouple from shared data bus. Use Value: Prevents bus contention during ADC conversion windows; wide temperature range ensures stable operation in uncontrolled environments. |
| Network Switch Backplane Interface | Medical Diagnostic Equipment Control Logic |
Use Scenario: Temporarily storing configuration bits from management MCU to FPGA-based packet routing logic. IC Role / Device Role / Timing Role: Provides glitch-free 8-bit parallel data transfer between asynchronous clock domains using LE edge synchronization. Use Value: Eliminates metastability risk in cross-domain transfers; 8.5 ns max propagation delay supports 100 Mbps control signaling. | Use Scenario: Holding calibration coefficients in portable ultrasound devices where firmware updates require nonvolatile shadow registers. IC Role / Device Role / Timing Role: Stores volatile but critical tuning parameters during power transitions, retaining values until new firmware writes. Use Value: Ensures zero-latency parameter recall after wake-up; low ICC (≤40 µA) extends battery life in handheld diagnostic tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC573N | Slower speed (tPLH ≤ 28 ns at 5 V), higher ICC (80 µA), same PDIP-20 footprint. | Lower drive (±7.8 mA) limits use in heavier capacitive bus loads. | Select for cost-sensitive, low-speed designs where AHC speed and drive are unnecessary. |
| 74LVX573M | Wider VCC range (2.7–3.6 V only), lower drive (±24 mA), different pinout (no OE on pin 1). | Not compatible with 5 V systems; lacks overvoltage-tolerant inputs. | Choose only for 3.3 V-only LVX logic families requiring tighter voltage tolerance and lower static power. |
Compared with SN74HC573N and 74LVX573M, SN74AHC573N delivers superior speed, broader voltage flexibility, and robust 5.5 V input tolerance-making it optimal for mixed-signal industrial and computing platforms requiring reliable bus interfacing across voltage domains.
Availability
SN74AHC573N is available at Aetrix Electronics and suitable for PC motherboards, industrial PLCs, and medical diagnostic equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74AHC573N 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 specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in high-reliability components.
The SN74AHC573N belongs to TI's AHC logic family, engineered for high-speed, low-power bus interface applications in computing, communications, and industrial control systems where voltage translation and noise resilience are critical.
FAQ
What is the maximum output current rating per pin for SN74AHC573N?
The SN74AHC573N supports ±25 mA continuous output current per Q pin, with a total device limit of ±75 mA across all outputs. This rating applies under recommended operating conditions (VCC = 2–5.5 V, TA = –40°C to 125°C) and ensures safe drive into standard CMOS/TTL loads without external buffering. Exceeding this may cause thermal stress or parametric shift in SN74AHC573N performance.
Does SN74AHC573N support 5 V logic levels when powered from 3.3 V?
Yes, SN74AHC573N inputs are overvoltage tolerant up to 5.5 V regardless of VCC level. When powered from 3.3 V, it safely accepts 5 V signals on D and LE/OE pins-enabling seamless level translation in mixed-voltage systems. This behavior is explicitly specified in the datasheet's Recommended Operating Conditions table and confirmed in Section 7.3 Feature Description.
What is the function of the OE pin on SN74AHC573N?
The OE (Output Enable) pin on SN74AHC573N is an active-low control that places all eight Q outputs simultaneously into high-impedance state when asserted low. Critically, OE has no effect on internal latch operation-data remains stored and can be updated via D/LE while outputs are disabled. This allows bus sharing without disrupting ongoing latch activity in SN74AHC573N-based systems.
Can SN74AHC573N be used in automotive applications?
SN74AHC573N is qualified for operation from –40°C to +125°C and meets JESD17 latch-up immunity, making it suitable for under-hood and infotainment applications within AEC-Q100 Grade 3 temperature requirements. However, it is not AEC-Q100 certified out-of-box; system-level validation-including board-level thermal cycling and EMC testing-is required before deployment in automotive safety-critical functions using SN74AHC573N.
What is the typical propagation delay of SN74AHC573N at 5 V supply?
At VCC = 5 V ± 0.5 V and CL = 15 pF, SN74AHC573N exhibits typical propagation delays of tPLH = 4.5 ns and tPHL = 4.5 ns (D to Q), and tPLH = 5 ns (LE to Q). These values are measured at TA = 25°C and represent best-case performance; the datasheet specifies maximum delays of 8.5 ns to guarantee timing margins across full temperature and voltage ranges for SN74AHC573N.
SN74AHC573N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 2V ~ 5.5V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 1ns
- Current - Output High, Low:
- 8mA, 8mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AHC573N FAQ
1.How can I place an order for SN74AHC573N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC573N 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 SN74AHC573N reliable?
The price and inventory of SN74AHC573N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC573N is usually 5 days.
3.What payment methods are accepted for SN74AHC573N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC573N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC573N?
SN74AHC573N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC573N 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 SN74AHC573N?
For technical support, including SN74AHC573N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC573N requirements.
6.How does Aetrix verify that SN74AHC573N is sourced from the original manufacturer or authorized distributors?
All SN74AHC573N 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 SN74AHC573N meets industry standards.
7.What is the process for return or replacement of SN74AHC573N?
All SN74AHC573N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC573N, 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 SN74AHC573N part is unused and in its original packaging.
Return procedure for SN74AHC573N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHC573N Tags
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