My Inquiry
My Account
onsemi 74ACTQ16245SSCX
- Part No.:
- 74ACTQ16245SSCX
- Manufacturer:
- onsemi
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACTQ16245SSCX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74ACTQ16245SSCX from Fairchild Semiconductor is a 16-bit bidirectional transceiver with 3-STATE outputs, designed for high-speed bus interfacing in TTL-compatible systems. It features byte-level control (OE1/T/R1 and OE2/T/R2), ±24 mA output drive, guaranteed pin-to-pin skew ≤3.0 ns, and operates across 4.5–5.5 V at –40°C to +85°C. It is used in memory address/data bus isolation and microprocessor system expansion.
For engineers reviewing the 74ACTQ16245SSCX datasheet, pinout, applications, or equivalent options, key selection criteria include simultaneous switching noise immunity (VOLP ≤0.8 V), dynamic input thresholds (VIHD ≥2.0 V, VILD ≤0.8 V), and SSOP-48 package compatibility with JEDEC MO-118 footprint.
Technical Context
The 74ACTQ16245SSCX implements two independent 8-bit bidirectional buffer sections, each controlled by dedicated OE and T/R inputs. Directional data flow (A↔B) is determined by T/R logic level, while 3-STATE operation is enabled via active-low OE. Its FACT Quiet Series architecture ensures controlled edge rates and minimized ground bounce during multi-output switching.
It supports dual-load AC characterization (50 pF and 250 pF), with propagation delays specified up to 14.6 ns (tPLH, CL=250 pF, TA=85°C) and guaranteed output skew under simultaneous switching. The device does not integrate internal termination or level-shifting - it requires external pull-ups/downs and voltage-aligned buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails; no 3.3 V operation. |
| Output Drive | ±24 mA - sufficient to drive 50 pF loads at full speed without external buffers. |
| Propagation Delay | ≤9.0 ns (tPLH, CL=50 pF, TA=85°C) - enables >100 MHz bus toggle rates in point-to-point configurations. |
| Pin-to-Pin Skew | ≤3.0 ns (tOST) - critical for timing-critical parallel bus synchronization (e.g., ISA, VME). |
| Simultaneous Switching Noise | VOLP ≤0.8 V (VCC=5.0 V) - limits ground bounce during 16-bit burst transfers. |
| Input Thresholds | VIH ≥2.0 V, VIL ≤0.8 V - ensures robust noise margin against TTL-level signal degradation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation. |
Pinout & Package
74ACTQ16245SSCX is packaged in a 48-lead Small Shrink Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch. Thermal pad not present; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 | A0–A15 | Side A bidirectional I/O - connects to local bus (e.g., CPU address/data); shares pins between input and output based on T/R state. |
| 17, 18 | OE1, T/R1 | Byte 1 control - OE1 active-low enables A0–A7/B0–B7; T/R1 HIGH routes A→B, LOW routes B→A. |
| 19–26, 27–34 | B0–B7, B8–B15 | Side B bidirectional I/O - connects to peripheral or memory bus; functionally identical to A-side but electrically isolated per byte. |
| 35, 36 | OE2, T/R2 | Byte 2 control - independently manages A8–A15/B8–B15; allows split-bus or interleaved addressing schemes. |
| 37, 48 | GND, VCC | Power terminals - dual GND (Pin 37) and dual VCC (Pin 48 + Pin 24) reduce supply impedance for quiet switching. |
| 24 | VCC | Primary power supply - must be decoupled locally with ≤100 nF ceramic capacitor near Pin 24. |
Key Features
| Feature | Design Value |
|---|---|
| FACT Quiet Series technology | Reduces simultaneous switching noise (SSN) via controlled output slew and internal GTO logic - eliminates need for external snubbers in dense PCB layouts. |
| Byte-selectable direction control | Enables independent A↔B routing for upper/lower bytes - supports partial-word transfers without full-bus arbitration. |
| Guaranteed 3-STATE disable timing | tPHZ ≤9.3 ns (max) - ensures clean bus release before next cycle begins, preventing contention in shared-memory systems. |
| Dynamic input threshold validation | VIHD ≥2.0 V / VILD ≤0.8 V measured under 1 MHz switching - confirms reliable sampling of noisy or slow-rising signals in real-world bus environments. |
| Load-flexible AC specs | AC parameters validated at both 50 pF and 250 pF - simplifies design reuse across low-capacitance backplanes and high-fanout daughterboards. |
Applications
| Memory Bus Isolation | Microprocessor System Expansion |
|---|---|
Use Scenario: Isolating DRAM address/data lines from CPU bus during DMA cycles to prevent contention and signal corruption. IC Role / Device Role / Timing Role: Bidirectional transceiver providing controlled, direction-gated data path between CPU and memory controller with sub-10 ns propagation delay. Use Value: Enables deterministic bus turnaround timing and eliminates need for external bus arbitrators in single-CPU embedded systems. | Use Scenario: Extending 16-bit ISA or PC/104 bus to add custom I/O cards while maintaining signal integrity across multiple slots. IC Role / Device Role / Timing Role: Level-translating and fanout-capable buffer that matches TTL logic levels and drives distributed trace capacitance. Use Value: Supports hot-plug-in capable backplane designs with guaranteed skew <3 ns across all 16 bits. |
| Industrial PLC Backplane Interface | Digital Test Equipment Data Path |
Use Scenario: Interfacing programmable logic controller CPU module to modular I/O carrier boards over ruggedized parallel bus. IC Role / Device Role / Timing Role: Robust 3-STATE transceiver operating across –40°C to +85°C with ±24 mA drive for long-trace industrial cabling. Use Value: Eliminates signal reflection and ground bounce in electrically noisy factory-floor environments using Quiet Series noise suppression. | Use Scenario: Routing pattern generator outputs to DUT (device under test) pins in automated test equipment with precise timing alignment. IC Role / Device Role / Timing Role: Synchronized bidirectional data path enabling stimulus-response loopback with calibrated delay matching. Use Value: Guarantees <3 ns inter-pin skew for time-domain measurement accuracy in high-speed digital test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16245TTR | TSSOP-48 package (MTD48), same electrical specs; slightly wider body (6.1 mm vs. 7.5 mm SSOP), different thermal profile. | Preferred for space-constrained PCBs where SSOP footprint is unavailable; requires revalidation of decoupling layout due to different lead inductance. | Select when board area is constrained and JEDEC MO-153 compliance is required. |
| SN74ACT16245DGGR | Texas Instruments part in SSOP-48; identical pinout and DC specs, but AC delays differ (tPLH max 10.5 ns vs. 9.0 ns); no guaranteed VOLP spec published. | Suitable for non-noise-critical applications; lacks documented simultaneous switching noise validation per Fairchild's FACT Quiet Series methodology. | Choose only if TI sourcing preference exists and SSN margin is verified externally. |
Compared with 74ACTQ16245SSCX, the 74ACT16245TTR offers identical functionality in a thinner package but requires layout adaptation, while the SN74ACT16245DGGR provides pin compatibility with relaxed noise performance - making the 74ACTQ16245SSCX the preferred choice for high-integrity industrial bus isolation where ground bounce must be bounded.
Availability
74ACTQ16245SSCX is available at Aetrix Electronics and suitable for memory bus isolation, microprocessor system expansion, and industrial PLC backplane interface requiring stable component supply and long-term industrial temperature support.
Supply support for 74ACTQ16245SSCX 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
Fairchild Semiconductor was a U.S.-based analog and discrete semiconductor manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The 74ACTQ16245SSCX belongs to the ACTQ family of advanced CMOS logic devices, engineered specifically for low-noise, high-speed bus interfacing in mission-critical industrial and computing systems.
FAQ
What is the maximum simultaneous output switching capability of the 74ACTQ16245SSCX?
The 74ACTQ16245SSCX is characterized for simultaneous switching of all 16 outputs, with noise metrics (VOLP, VOHP) measured under worst-case 16-bit toggle conditions at 1 MHz. Its FACT Quiet Series design guarantees VOLP ≤0.8 V and VOHP ≤(VOH −1.0) V under these conditions, enabling reliable operation in high-fanout bus environments without added termination.
Does the 74ACTQ16245SSCX support 3.3 V operation?
No, the 74ACTQ16245SSCX is specified only for 4.5 V to 5.5 V supply operation. It is not rated for 3.3 V logic interfaces. Attempting to operate the 74ACTQ16245SSCX below 4.5 V may result in undefined output states, increased propagation delay, and failure to meet VIH/VIL thresholds - use level translators or 3.3 V–compatible alternatives like the 74LVC16245 for mixed-voltage systems.
How are the OE and T/R inputs used together in the 74ACTQ16245SSCX?
In the 74ACTQ16245SSCX, OE (active-low) and T/R jointly control data flow: when OE is LOW and T/R is HIGH, data passes from A-side to B-side; when OE is LOW and T/R is LOW, data flows from B-side to A-side; when OE is HIGH, both A and B ports enter high-impedance state regardless of T/R. This dual-control scheme enables precise bus arbitration in multiprocessor or DMA systems.
Is the 74ACTQ16245SSCX pin-compatible with standard 74ACT245 variants?
Yes, the 74ACTQ16245SSCX maintains functional and pinout compatibility with the 74ACT245 family, including identical SSOP-48 pin mapping for A/B I/O, OE, and T/R signals. However, the "Q" suffix denotes Fairchild's Quiet Series enhancements - improved SSN behavior and tighter skew specs - without altering physical or logical connectivity.
What decoupling is recommended for stable operation of the 74ACTQ16245SSCX?
Each VCC pin (Pins 24 and 48) of the 74ACTQ16245SSCX must be decoupled with a minimum 100 nF X7R ceramic capacitor placed within 3 mm of the pin, plus a 4.7 µF tantalum or polymer capacitor per power domain. This mitigates supply droop during simultaneous 16-bit switching and ensures VOLP/VOLV remain within specification per Figure 1 and Figure 2 test conditions.
74ACTQ16245SSCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74ACTQ16245SSCX FAQ
1.How can I place an order for 74ACTQ16245SSCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ16245SSCX 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 74ACTQ16245SSCX reliable?
The price and inventory of 74ACTQ16245SSCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ16245SSCX is usually 5 days.
3.What payment methods are accepted for 74ACTQ16245SSCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ16245SSCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACTQ16245SSCX?
74ACTQ16245SSCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ16245SSCX 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 74ACTQ16245SSCX?
For technical support, including 74ACTQ16245SSCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ16245SSCX requirements.
6.How does Aetrix verify that 74ACTQ16245SSCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ16245SSCX 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 74ACTQ16245SSCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ16245SSCX?
All 74ACTQ16245SSCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ16245SSCX, 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 74ACTQ16245SSCX part is unused and in its original packaging.
Return procedure for 74ACTQ16245SSCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74ACTQ16245SSCX Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
