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Texas Instruments 74ACT16952DL
- Part No.:
- 74ACT16952DL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16952DL.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,813
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Product details
Overview
74ACT16952DL from Texas Instruments is a 16-bit registered transceiver IC with dual-directional flow-through architecture, TTL-voltage-compatible inputs, noninverting 3-state outputs, and dual 16-bit back-to-back D-type registers. It operates from –40°C to 85°C at 4.5–5.5 V supply, supports up to 75 MHz clock frequency, and is packaged in a 56-pin shrink small-outline (SSOP-DL) package for high-density PCB layouts in bus interface applications.
For engineers reviewing the 74ACT16952DL datasheet, 74ACT16952DL pinout, 74ACT16952DL application, or 74ACT16952DL equivalent, key selection considerations include bidirectional registered data latching, 24 mA drive strength per output, distributed VCC/GND pinning for noise suppression, and compatibility with legacy ACT logic families in memory and peripheral expansion systems.
Technical Context
The 74ACT16952DL implements two independent 16-bit register banks-one for A-to-B and one for B-to-A data flow-each controlled by dedicated clock (CLKAB/CLKBA), clock-enable (CEAB/CEBA), and output-enable (OEAB/OEBA) signals. Data is latched on the low-to-high transition of its respective clock when the corresponding CE is low.
Its flow-through pinout minimizes trace crossings, while distributed power/ground pins reduce simultaneous switching noise. The EPIC™ 1-µm CMOS process delivers 500-mA latch-up immunity at 125°C and supports TTL-level input thresholds (VIL = 0.8 V, VVIH = 2 V) with 5-V nominal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across industrial 5-V rail tolerances |
| Max Clock Frequency | 75 MHz - enables high-speed synchronous bus bridging between subsystems |
| Output Drive | ±24 mA - sufficient to drive 50-pF loads with <12 ns propagation delay (tPLH/tPHL) |
| Operating Temperature | –40°C to +85°C - qualified for commercial and extended-temperature industrial environments |
| Input Compatibility | TTL-voltage - interfaces directly with legacy 74LS/TTL logic without level-shifting |
| Power Dissipation Cap | 1.4 W (at TA = 55°C) - defines thermal derating limits for continuous operation in compact enclosures |
| Propagation Delay | 4.7–11.8 ns (CLK to A/B) - determines maximum achievable setup/hold timing margin in synchronous designs |
Pinout & Package
74ACT16952DL uses a 56-pin shrink small-outline package (SSOP-DL) with 25-mil center-to-center pin spacing and 300-mil body width, optimized for high I/O density in space-constrained board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers for respective 8-bit port segments; enables bidirectional bus isolation |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register Clock (rising-edge) | Latches data from A-to-B or B-to-A ports synchronously; requires stable CE before CLK↑ |
| 1CEAB, 2CEAB, 1CEBA, 2CEBA | Clock Enable (active-low) | Gates clock sensitivity - prevents false triggering during clock transitions or bus contention |
| 1A1–1A8, 2A1–2A8, 1B1–1B8, 2B1–2B8 | Bidirectional Data I/O | Two 16-bit ports (A and B); each split into two 8-bit groups for flexible partitioning as 8-bit or 16-bit transceivers |
| VCC, GND | Power and Ground | Distributed across package (12 VCC, 12 GND) - reduces ground bounce and improves high-speed signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Minimizes PCB trace length and layer count by aligning A and B port pins on opposite sides of the package |
| Dual independent register banks | Enables concurrent A→B and B→A data latching without internal bus contention or arbitration logic |
| TTL-input compatible thresholds | Accepts standard 74LS logic levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V) while operating at 5-V CMOS performance |
| EPIC™ 1-µm CMOS process | Delivers latch-up immunity >500 mA at 125°C - critical for reliability in noisy industrial power environments |
| 300-mil SSOP-DL package | Provides double the I/O count of standard SOIC in same board area - ideal for legacy system upgrades with footprint constraints |
Applications
| Memory Expansion Interface | Peripheral Bus Bridge |
|---|---|
Use Scenario: Connecting an 80C188 microcontroller's multiplexed address/data bus to external SRAM or Flash memory arrays. IC Role / Device Role / Timing Role: Registered transceiver buffers and latches address and data lines with synchronized clock control to resolve bus timing skew. Use Value: Eliminates need for discrete latches and buffers; supports 75 MHz burst transfers with guaranteed setup/hold margins per TI timing specs. | Use Scenario: Interfacing a DSP's EMIF to FPGA-based co-processor or custom ASIC with asynchronous timing domains. IC Role / Device Role / Timing Role: Bidirectional registered data path with independent A/B clocks and enables - isolates timing domains while preserving data integrity. Use Value: Enables deterministic handshaking via CE/OE controls; avoids metastability with registered sampling at each port boundary. |
| Backplane Data Router | Legacy System Bus Extender |
Use Scenario: High-speed data routing between two VMEbus or Multibus II slots requiring direction-controlled, noise-immune signaling. IC Role / Device Role / Timing Role: Flow-through transceiver with distributed VCC/GND pins - acts as electrically isolated repeater stage with minimal added jitter. Use Value: Reduces simultaneous switching noise by >30% vs. conventional SOIC packages; meets EMI requirements for multi-slot chassis. | Use Scenario: Upgrading a 1980s minicomputer backplane to support higher-speed peripherals without redesigning PCB layout. IC Role / Device Role / Timing Role: Pin-compatible ACT-family replacement for obsolete 74FCT16245 or 74ACT16374 in existing DL-package footprints. Use Value: Maintains identical 56-pin SSOP-DL mechanical fit and TTL-compatible logic thresholds while doubling throughput via registered flow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT16374DL | Octal D-type flip-flop (not transceiver); unidirectional only; no B-port or OEBA/CLKBA controls | Only suitable for unidirectional registered buffering - cannot replace bidirectional data flow in 74ACT16952DL | Select only if application requires single-direction latching with identical package and voltage specs |
| 74ACT16245DL | Non-registered 16-bit transceiver; lacks internal D-flip-flops; relies on external clocking logic | Requires external clock generation and edge-triggered control - increases component count and timing complexity | Choose when lower propagation delay (<8 ns) is prioritized over synchronous registration and noise immunity |
Compared with SN74ACT16374DL and 74ACT16245DL, the 74ACT16952DL uniquely integrates dual-directional registered latching within a single 56-pin SSOP, eliminating external clock distribution and enabling true synchronous bidirectional bus handshaking without added logic or layout overhead.
Availability
74ACT16952DL is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral bus bridges, backplane data routers, and legacy system bus extenders requiring stable component supply and long-term industrial availability.
Supply support for 74ACT16952DL 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 decades of heritage in high-reliability industrial and automotive-grade components.
The 74ACT16952DL belongs to TI's Widebus™ family of high-speed registered transceivers, designed specifically for noise-sensitive, high-density bus interfacing in industrial control, test equipment, and legacy system modernization.
FAQ
What is the maximum clock frequency supported by the 74ACT16952DL?
74ACT16952DL supports a maximum clock frequency of 75 MHz across its full operating temperature range (–40°C to +85°C) at VCC = 5 V ± 0.5 V. This rating is validated per TI's switching characteristics table and applies to both CLKAB and CLKBA inputs under recommended operating conditions with proper load capacitance (≤50 pF).
Does the 74ACT16952DL require external pull-up or pull-down resistors on control inputs?
No - the 74ACT16952DL does not require external pull-up or pull-down resistors on CEAB, CEBA, OEAB, or OEBA inputs. Its TTL-compatible inputs have defined VIL (≤0.8 V) and VIH (≥2.0 V) thresholds, and TI's datasheet explicitly states that unused pins must be held high or low, implying internal biasing is not provided and external termination is necessary only for floating prevention in unused configurations.
Can the 74ACT16952DL operate with a 3.3-V supply?
No - the 74ACT16952DL is not rated for 3.3-V operation. Its absolute maximum supply voltage is 7 V, but recommended operating range is strictly 4.5 V to 5.5 V. The device uses ACT-series TTL-compatible input thresholds and EPIC™ CMOS process optimized for 5-V logic families; operation below 4.5 V violates datasheet specifications and risks unreliable output drive and timing compliance.
How many power and ground pins does the 74ACT16952DL have, and why is this important?
The 74ACT16952DL has 12 VCC and 12 GND pins distributed across the 56-pin DL package. This configuration minimizes high-speed switching noise by reducing ground bounce and supply droop during simultaneous output transitions - a key design feature documented in TI's datasheet to support clean signal integrity in dense, high-frequency bus applications.
Is the 74ACT16952DL pin-compatible with the 74ACT16245DL?
No - the 74ACT16952DL is not pin-compatible with the 74ACT16245DL. Although both use the 56-pin DL package, their pinouts differ significantly: 74ACT16952DL includes dedicated CLKAB/CLKBA, CEAB/CEBA, and OEAB/OEBA signals for registered operation, whereas 74ACT16245DL uses DIR and OE controls for non-registered transceiving. Direct substitution would require PCB redesign.
74ACT16952DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 56-SSOP
74ACT16952DL FAQ
1.How can I place an order for 74ACT16952DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16952DL 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 74ACT16952DL reliable?
The price and inventory of 74ACT16952DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16952DL is usually 5 days.
3.What payment methods are accepted for 74ACT16952DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16952DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16952DL?
74ACT16952DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16952DL 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 74ACT16952DL?
For technical support, including 74ACT16952DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16952DL requirements.
6.How does Aetrix verify that 74ACT16952DL is sourced from the original manufacturer or authorized distributors?
All 74ACT16952DL 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 74ACT16952DL meets industry standards.
7.What is the process for return or replacement of 74ACT16952DL?
All 74ACT16952DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16952DL, 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 74ACT16952DL part is unused and in its original packaging.
Return procedure for 74ACT16952DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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