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Texas Instruments 74ACT16657DL
- Part No.:
- 74ACT16657DL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16657DL.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,019
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Product details
Overview
74ACT16657DL from Texas Instruments is a 16-bit dual octal transceiver IC with integrated parity generator/checker circuits, 3-state outputs, and TTL-voltage-compatible inputs. It operates at 4.5–5.5 V over –40°C to 85°C, supports bidirectional data flow per section (A↔B), and delivers tPLH/tPHL ≤10.7 ns typical propagation delay. It is used in high-reliability bus interface applications requiring real-time parity validation, such as industrial backplane data links.
For engineers reviewing the 74ACT16657DL datasheet, 74ACT16657DL pinout, 74ACT16657DL application, or 74ACT16657DL equivalent, key selection criteria include its dual-section parity-aware transceiver architecture, DL-package 56-pin SSOP footprint, ±24 mA drive strength, flow-through pin layout for PCB signal integrity, and compatibility with 5-V TTL logic systems.
Technical Context
The 74ACT16657DL implements two independent octal transceiver sections (1A/1B and 2A/2B), each with dedicated transmit/receive (T/R) control, output-enable (OE), odd/even parity select (ODD/EVEN), and parity bit I/O (PARITY). Data direction is dynamically controlled per section via T/R polarity, while OE places both A and B ports into high-impedance state.
Each section performs real-time parity generation in transmit mode (setting PARITY to maintain selected odd/even sense across eight data bits + parity) and parity checking in receive mode (asserting ERR low on mismatch). The device uses TI's EPIC 1-µm CMOS process, features distributed VCC/GND pins to suppress switching noise, and employs flow-through pin mapping to minimize trace crossovers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures interoperability with standard 5-V TTL and CMOS systems without level-shifting. |
| Propagation Delay (tPLH/tPHL) | ≤10.7 ns max (A↔B) - Enables reliable operation in high-speed synchronous bus interfaces up to ~50 MHz. |
| Output Drive Strength | ±24 mA - Supports direct fan-out to ≥10 LSTTL loads or termination-matched transmission lines. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and extended-temperature industrial environments. |
| Parity Function | Dual independent odd/even parity generation & checking - Provides per-bus-segment error detection without external logic. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Interfaces directly with legacy 5-V TTL outputs without pull-ups or translators. |
| Package | 56-pin SSOP (DL), 300-mil width, 25-mil pitch - High-density footprint optimized for space-constrained backplane or motherboard layouts. |
Pinout & Package
74ACT16657DL is housed in a 56-pin Shrink Small-Outline Package (SSOP), designated DL by Texas Instruments. This package features 300-mil body width, 25-mil center-to-center pin spacing, and gull-wing leads suitable for surface-mount reflow assembly. Pin 1 is located at the top-left corner (Q1 quadrant) when viewed from the top with the marking side up and the notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output Enable (active-high) | Disables both A and B ports of respective section into high-Z - enables bus sharing among multiple devices. |
| 1T/R, 2T/R | Transmit/Receive Control | High = A→B (transmit); Low = B→A (receive) - defines real-time bidirectional data path per section. |
| 1ODD/EVEN, 2ODD/EVEN | Parity Mode Select | High = odd parity; Low = even parity - configures parity generator/checker behavior before data transfer. |
| 1PARITY, 2PARITY | Parity Bit I/O | Output in transmit mode; input in receive mode - carries computed or expected parity value for 9-bit (8+1) word. |
| 1ERR, 2ERR | Parity Error Flag | Active-low open-drain output - asserts low when received data fails parity check, enabling interrupt-driven error handling. |
| 1A1–1A8, 2A1–2A8 | Section A Data I/O | Octal bidirectional data port - connects to local controller or processor bus segment. |
| 1B1–1B8, 2B1–2B8 | Section B Data I/O | Octal bidirectional data port - connects to remote bus, memory module, or peripheral interface. |
| VCC, GND | Power Distribution | Multiple distributed VCC/GND pins (pins 7, 11, 20, 28, 32, 39, 46, 50, 53) - reduce simultaneous switching noise and improve power integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent parity-aware transceivers | Enables two isolated 8-bit data paths with concurrent parity generation and checking - eliminates need for discrete parity logic per bus. |
| Flow-through pin architecture | Input and output pins aligned on opposite sides (e.g., 1A1–1A8 on left, 1B1–1B8 on right) - minimizes layer transitions and crosstalk in dense PCB routing. |
| Distributed VCC/GND pinning | Nine total power/ground pins strategically placed across package - lowers impedance path for high-frequency return currents and reduces ground bounce. |
| EPIC 1-µm CMOS process | Delivers 500-mA latch-up immunity at 125°C - ensures robustness in electrically noisy industrial environments with transient surges. |
| TTL-input voltage compatibility | Accepts standard 5-V TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct connection to legacy microcontrollers, FPGAs, and ASICs without level shifters. |
Applications
| Industrial Backplane Interface | Redundant Memory Bus Controller |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards across a 16-bit parallel backplane with EMI-sensitive environment. IC Role / Device Role / Timing Role: Dual-section transceiver manages two independent 8-bit segments; parity logic validates integrity of each 9-bit word during hot-swap or high-noise operation. Use Value: Real-time parity error detection (via ERR flag) triggers firmware-level retry or failover before corrupted data propagates to safety-critical subsystems. |
Use Scenario: Synchronizing mirrored SRAM banks in fault-tolerant embedded controllers where data consistency must be verified on every write cycle. IC Role / Device Role / Timing Role: Acts as parity-enabling bus buffer between memory controller and dual SRAM arrays; PARITY signals feed external ECC logic or status registers. Use Value: Eliminates need for separate parity generators, reducing component count and board area while maintaining sub-11 ns round-trip latency for memory access. |
| Programmable Logic Interconnect | Legacy System Bus Extender |
|
Use Scenario: Glue logic between FPGA I/O banks and off-chip peripherals operating at different voltage thresholds but shared 5-V timing domain. IC Role / Device Role / Timing Role: Provides direction-controlled, 3-state-isolated data path with parity tagging - enables FPGA to validate handshake protocol integrity. Use Value: Flow-through pinout simplifies FPGA-to-peripheral routing; ±24 mA drive ensures clean edges into capacitive loads up to 50 pF. |
Use Scenario: Upgrading aging 80x86-based industrial controllers with modern peripherals while retaining original bus timing and voltage levels. IC Role / Device Role / Timing Role: Replaces obsolete 74LS620/621 transceivers with enhanced speed, parity support, and lower power - no PCB redesign required. Use Value: Direct TTL-compatible interface preserves existing timing budgets; DL-package footprint matches legacy SOIC-56 footprints with improved thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit parity transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT16652DL | Single 16-bit transceiver (no parity); identical DL package, pinout, and AC specs. | Lacks parity generator/checker and ERR/ODD-EVEN controls - requires external parity logic for error detection. | Select when parity is handled upstream/downstream; offers same speed and drive in simpler bus isolation roles. |
| 74ACT16257DL | 16-bit dual transceiver with 3-state only; no parity circuitry; same DL package and pin count. | Provides basic bidirectional buffering without parity functions - lower gate count and static power. | Choose for cost-sensitive or non-critical data paths where error detection is not required at the physical layer. |
Compared with SN74ACT16652DL and 74ACT16257DL, the 74ACT16657DL uniquely integrates per-section parity generation, checking, and error flagging - delivering end-to-end data integrity verification within a single 56-pin SSOP, eliminating design overhead for external parity logic and reducing system-level validation complexity.
Availability
74ACT16657DL is available at Aetrix Electronics and suitable for industrial backplane interfaces, redundant memory bus controllers, programmable logic interconnects, and legacy system bus extenders requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74ACT16657DL 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74ACT16657DL belongs to TI's Widebus™ family of high-speed CMOS logic devices, designed specifically for high-density, low-noise parallel bus interfacing in industrial control, telecommunications infrastructure, and computing backplanes.
FAQ
What is the operating temperature range for the 74ACT16657DL?
The 74ACT16657DL is characterized for operation from –40°C to +85°C. This commercial/industrial temperature range supports deployment in factory automation controllers, outdoor telecom equipment enclosures, and other environments where ambient temperatures exceed consumer-grade limits but do not require full military specification.
How does the 74ACT16657DL handle parity checking during data reception?
During receive mode (T/R low), the 74ACT16657DL samples all eight B-port bits plus the incoming PARITY bit, counts high bits, and compares the result against the selected odd/even sense (set by ODD/EVEN). If mismatched, it asserts the corresponding ERR output low - a direct hardware indication usable for interrupt generation or status polling without software intervention.
Can the 74ACT16657DL be used with 3.3-V logic systems?
No - the 74ACT16657DL is specified only for 4.5–5.5 V supply operation and TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V). It is not 3.3-V tolerant; connecting to 3.3-V drivers risks violating absolute maximum input voltage ratings and may cause malfunction or damage. Level translation is required for mixed-voltage systems.
What is the significance of the "DL" package designation for the 74ACT16657DL?
The "DL" designation identifies Texas Instruments' 56-pin Shrink Small-Outline Package: 300-mil body width, 25-mil lead pitch, gull-wing leads. It provides double the I/O density of standard SOIC packages in the same PCB area and features distributed power/ground pins to suppress high-speed switching noise - critical for clean signal integrity in 16-bit parallel buses.
Does the 74ACT16657DL support hot insertion or live bus swapping?
The 74ACT16657DL does not include built-in hot-swap protection features such as power sequencing or slew-rate control. However, its 3-state outputs, high latch-up immunity (500 mA at 125°C), and robust ESD tolerance enable safe use in hot-plug-capable systems when combined with external current-limiting resistors and proper power-rail staging - as validated in TI's application notes for Widebus™ backplane designs.
74ACT16657DL 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
74ACT16657DL FAQ
1.How can I place an order for 74ACT16657DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16657DL 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 74ACT16657DL reliable?
The price and inventory of 74ACT16657DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16657DL is usually 5 days.
3.What payment methods are accepted for 74ACT16657DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16657DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16657DL?
74ACT16657DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16657DL 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 74ACT16657DL?
For technical support, including 74ACT16657DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16657DL requirements.
6.How does Aetrix verify that 74ACT16657DL is sourced from the original manufacturer or authorized distributors?
All 74ACT16657DL 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 74ACT16657DL meets industry standards.
7.What is the process for return or replacement of 74ACT16657DL?
All 74ACT16657DL units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16657DL, 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 74ACT16657DL part is unused and in its original packaging.
Return procedure for 74ACT16657DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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