My Inquiry
My Account
Texas Instruments SN74ACT7813-20DLR
- Part No.:
- SN74ACT7813-20DLR
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT7813-20DLR.pdf
- Description:
- IC FIFO SYNC 64X18 13NS 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,738
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ACT7813-20DLR from Texas Instruments is a 64-word × 18-bit clocked FIFO memory IC designed for asynchronous datapath buffering in high-speed digital systems. It supports independent read/write clocks up to 50 MHz, delivers 12 ns access time with 50-pF load, features synchronized input-ready (IR) and output-ready (OR) flags, and operates across 0°C to 70°C. It is used in bidirectional data bridging between mismatched clock domains in communication interfaces and bus arbitration logic.
For engineers reviewing the SN74ACT7813-20DLR datasheet, SN74ACT7813-20DLR pinout, SN74ACT7813-20DLR application, or SN74ACT7813-20DLR equivalent, key selection considerations include its 56-pin SSOP package, programmable almost-full/almost-empty flag offsets, half-full flag, dual-clock synchronization architecture, and compatibility with TI's Widebus™ family for width expansion without external logic.
Technical Context
The SN74ACT7813-20DLR implements a synchronous dual-port FIFO using advanced CMOS technology with independent write clock (WRTCLK) and read clock (RDCLK) domains. Its status flags-IR, OR, HF, and AF/AE-are fully synchronized to their respective clock edges, eliminating metastability in cross-domain handshaking.
It integrates on-chip write/read pointer logic, reset-synchronized flag initialization, and programmable AF/AE offset values (X/Y) via D0–D4 and PEN control. The FIFO supports bidirectional configuration and 36-bit word-width expansion using two devices, enabled by dedicated OE1/OE2 and WRTEN1/WRTEN2 control inputs without additional glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 64 words × 18 bits - provides 1,152-bit buffer capacity for burst-mode data alignment |
| Max Clock Frequency | 50 MHz - enables reliable operation in 20-ns timing grade systems (e.g., legacy PCI, VME, or custom parallel buses) |
| Access Time | 12 ns @ 50-pF load - ensures deterministic latency for real-time data streaming with simultaneous output switching |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic rails and industrial power margins |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial embedded applications without derating |
| Output Drive | 16 mA sink / –8 mA source - sufficient to drive multiple 5-V CMOS loads or terminated transmission lines |
| Flag Synchronization | IR synced to WRTCLK↑, OR synced to RDCLK↑ - eliminates setup/hold violations in asynchronous clock domain crossing |
Pinout & Package
Packaged in a 56-pin Shrink Small-Outline Package (SSOP-DL), 300-mil body width, 25-mil center-to-center lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET (Pin 1) | Asynchronous reset input | Must be held low for ≥4 WRTCLK↑ and ≥4 RDCLK↑ edges to initialize IR, OR, HF = low and AF/AE = high |
| WRTCLK (Pin 25) | Write clock input | Rising-edge triggered; controls all write operations and synchronizes IR flag |
| RDCLK (Pin 32) | Read clock input | Rising-edge triggered; controls all read operations and synchronizes OR, HF, AF/AE flags |
| D0–D17 (Pins 2–14, 16–21, 12) | Data input bus | 18-bit parallel input port; D0–D4 used to program AF/AE offsets when PEN is active |
| Q0–Q17 (Pins 33–34, 36–38, 40–43, 45–49, 51, 53–55) | Data output bus | 18-bit tristatable output port; outputs valid data only when OE1=OE2=RDEN=low and OR=high |
| IR (Pin 28) | Input-ready flag output | Synchronized to WRTCLK↑; low = FIFO full, writes disabled; goes high on second WRTCLK↑ after reset |
| OR (Pin 29) | Output-ready flag output | Synchronized to RDCLK↑; low = FIFO empty, reads disabled; asserts high on third RDCLK↑ after first write |
| HF (Pin 22) | Half-full flag output | High when ≥32 words stored; useful for flow control in balanced throughput applications |
| AF/AE (Pin 24) | Programmable status flag | High when FIFO contains ≤X words (AE) or ≥(64–Y) words (AF); X/Y default to 8, programmable via PEN/D0–D4 |
| PEN (Pin 23) | Program enable input | Latched on WRTCLK↑ to capture D0–D4 as AE offset (X); second WRTCLK↑ captures AF offset (Y) |
| WRTEN1/WRTEN2 (Pins 27/26) | Write enable pair | Active-high WRTEN1 + active-low WRTEN2 required with IR high to enable write on WRTCLK↑ |
| RDEN (Pin 31) | Read enable input | Active-low; must be low with OE1/OE2 low and OR high to enable read on RDCLK↑ |
| OE1/OE2 (Pins 56/30) | Output enable pair | Both must be low (with RDEN low and OR high) to enable Q0–Q17 drivers; either high forces high-Z state |
Key Features
| Feature | Design Value |
|---|---|
| Independent free-running clocks | WRTCLK and RDCLK may be fully asynchronous or coincident - eliminates need for clock domain synchronization logic |
| Programmable AF/AE flag | Customizable almost-full/almost-empty thresholds (X/Y = 0–31) via D0–D4 and PEN - enables precise buffer management in variable-rate systems |
| Bidirectional configuration support | Two SN74ACT7813-20DLR devices can be interconnected for full-duplex data flow without external gates - reduces BOM count and PCB area |
| Width expansion capability | Multiple devices can be stacked to implement 36-bit (or wider) FIFOs using shared clocks and flags - avoids multiplexer complexity |
| Output edge control (OEC™) | Patented TI circuitry dampens simultaneous switching noise on Q0–Q17 outputs - improves signal integrity in dense layouts |
Applications
| PCI Bus Bridge Buffering | Industrial Serial-to-Parallel Converter Interface |
|---|---|
Use Scenario: Buffering data between PCI host and slower peripheral controller with mismatched clock domains. IC Role / Device Role / Timing Role: Acts as a clock-domain crossing FIFO, absorbing burst transfers from 33-MHz PCI and releasing data at peripheral clock rate. Use Value: Prevents data loss during clock skew or frequency mismatch; IR/OR flags provide handshake signaling without external logic. | Use Scenario: Interfacing an RS-422 serial receiver to a parallel microcontroller bus operating at different timing. IC Role / Device Role / Timing Role: Stores serialized incoming bytes until full 18-bit word is assembled, then presents it synchronously to MCU on RDCLK. Use Value: Eliminates software polling or interrupt overhead; HF flag triggers DMA request at 50% fill level for efficient throughput. |
| Dual-Processor Memory Coherency Link | Legacy Video Frame Capture Buffer |
Use Scenario: Enabling deterministic data exchange between two independent processors running at different clock frequencies. IC Role / Device Role / Timing Role: Provides isolated, depth-limited queue for command/status messages with synchronized IR/OR handshaking. Use Value: Guarantees atomic message delivery; programmable AF/AE allows tuning for latency vs. overflow safety trade-off. | Use Scenario: Capturing digitized video lines from analog front-end into frame buffer memory before processing. IC Role / Device Role / Timing Role: Temporarily stores 18-bit pixel data streams from ADC at pixel clock rate, releases to SDRAM controller at system clock. Use Value: Absorbs jitter between sampling and memory write clocks; 12-ns access time ensures no pipeline stall during back-to-back pixel bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT7803-20DL | 64 × 9-bit depth; half the data width; identical pinout and timing | Requires two devices for 18-bit interface; higher board area and routing complexity | Select when 9-bit data path suffices or cost-per-bit optimization is critical |
| SN74ACT7805-20DL | 256 × 9-bit depth; 4× memory capacity but same 9-bit width; different pin assignment for flags | Not pin-compatible; requires PCB redesign; better suited for deep buffering with narrower bus | Choose for applications needing longer latency tolerance and deeper queueing, not direct replacement |
Compared with SN74ACT7803-20DL and SN74ACT7805-20DL, the SN74ACT7813-20DLR uniquely delivers native 18-bit width in a single device with full flag set and pin-to-pin compatibility to other -20 speed grade Widebus™ FIFOs - simplifying layout and reducing interconnect delay in wide-data-path systems.
Availability
SN74ACT7813-20DLR is available at Aetrix Electronics and suitable for industrial communications interfaces, legacy bus bridging, and embedded data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT7813-20DLR 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 50 years of innovation in high-reliability digital interface components.
The SN74ACT7813-20DLR belongs to TI's Widebus™ family of high-speed FIFOs, engineered specifically for robust clock-domain crossing in industrial, telecom, and computing infrastructure where deterministic latency and flag-synchronized handshaking are essential.
FAQ
What is the maximum supported clock frequency for SN74ACT7813-20DLR?
The SN74ACT7813-20DLR is rated for up to 50 MHz on both WRTCLK and RDCLK inputs under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This corresponds to a 20-ns minimum clock period and is validated per the 'ACT7813-20 speed grade in the SCAS199B datasheet. Operation beyond 50 MHz is not guaranteed and may violate setup/hold timing margins.
How does the AF/AE flag programming work on SN74ACT7813-20DLR?
After reset and before the first write, the SN74ACT7813-20DLR latches D0–D4 as the almost-empty offset (X) when PEN is low and WRTCLK rises. A second WRTCLK↑ with PEN low latches D0–D4 as the almost-full offset (Y). Default values are X = Y = 8. Programming disables writes until complete, and max value for either offset is 31.
Is SN74ACT7813-20DLR pin-compatible with other Widebus™ FIFOs?
Yes - the SN74ACT7813-20DLR is pin-to-pin compatible with SN74ACT7803 and SN74ACT7805 in the same DL (SSOP-56) package, sharing identical pin assignments for clocks, enables, flags, and I/O. However, data width (18-bit vs. 9-bit) and memory depth differ, so functional compatibility requires verification of system-level width and depth requirements.
What happens to output drivers during reset on SN74ACT7813-20DLR?
During RESET assertion, the SN74ACT7813-20DLR places Q0–Q17 outputs in high-impedance state regardless of OE1/OE2 levels. Output drivers remain disabled until OR goes high - which occurs on the third rising edge of RDCLK after the first valid word is written to an empty FIFO - ensuring no bus contention during initialization.
Does SN74ACT7813-20DLR support bidirectional data flow in a single device?
No - the SN74ACT7813-20DLR is a unidirectional FIFO (D0–D17 → Q0–Q17). Bidirectional operation requires two SN74ACT7813-20DLR devices configured per Figure 8 in the datasheet: one for transmit (host→peripheral), one for receive (peripheral→host), sharing clocks and control signals without external logic.
SN74ACT7813-20DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 1.125K (64 x 18)
- Function:
- Synchronous
- Data Rate:
- 50MHz
- Access Time:
- 13ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 400µA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ACT7813-20DLR FAQ
1.How can I place an order for SN74ACT7813-20DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT7813-20DLR 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 SN74ACT7813-20DLR reliable?
The price and inventory of SN74ACT7813-20DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT7813-20DLR is usually 5 days.
3.What payment methods are accepted for SN74ACT7813-20DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT7813-20DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT7813-20DLR?
SN74ACT7813-20DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT7813-20DLR 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 SN74ACT7813-20DLR?
For technical support, including SN74ACT7813-20DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT7813-20DLR requirements.
6.How does Aetrix verify that SN74ACT7813-20DLR is sourced from the original manufacturer or authorized distributors?
All SN74ACT7813-20DLR 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 SN74ACT7813-20DLR meets industry standards.
7.What is the process for return or replacement of SN74ACT7813-20DLR?
All SN74ACT7813-20DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT7813-20DLR, 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 SN74ACT7813-20DLR part is unused and in its original packaging.
Return procedure for SN74ACT7813-20DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT7813-20DLR Tags
-
7201LA15JGI
Renesas
-
7204L12JG
Renesas
-
72V82L15PAG8
Renesas
-
7205L15JGI
Renesas
-
7208L20JG
Renesas
-
72V2105L10PFG
Renesas
-
72V2111L15PFGI
Renesas
-
72V2113L6PFG
Renesas
-
72V36110L6PFG
Renesas
-
SN74ALVC7804-40DL
Texas Instruments
-
7202LA25JGI
Renesas
-
SN74V245-15PAG
Texas Instruments
Tech Hub
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…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
