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Texas Instruments SN74ACT7201LA15RJR
- Part No.:
- SN74ACT7201LA15RJR
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
SN74ACT7201LA15RJR.pdf
- Description:
- IC FIFO ASYNC 512X9 15NS 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
SN74ACT7201LA15RJR from Texas Instruments is a 512 × 9 asynchronous dual-port FIFO memory IC with independent read/write operations, 15 ns access time, 40 MHz max clock frequency, and TTL-compatible inputs. It implements first-in-first-out buffering for data rate translation between asynchronous buses in communication and data-acquisition systems.
For engineers reviewing the SN74ACT7201LA15RJR datasheet, SN74ACT7201LA15RJR pinout, SN74ACT7201LA15RJR application, or SN74ACT7201LA15RJR equivalent, this page delivers verified timing parameters, flag behavior (EF/FF/XO-HF), retransmit logic, depth/width expansion capability, and RJ-package terminal mapping - all confirmed from TI SCAS221A Rev. September 1995.
Technical Context
This device integrates dual-port SRAM with internal write and read address counters, enabling true asynchronous or coincident read/write cycles without external sequencing logic. Its status flags (EF, FF, XO/HF) are generated directly from pointer arithmetic and drive real-time flow control.
The FL/RT input supports two distinct modes: retransmit enable (when XI = GND) or first-load designation (in daisy-chained depth expansion). The RS input resets both pointers to location zero and initializes EF = L, FF = H, XO/HF = H - a mandatory power-up sequence before write operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 512 × 9 bits - provides 512 words of 9-bit storage (8 data + 1 parity or framing bit). |
| Data Access Time | 15 ns - guarantees valid Q0–Q8 output within 15 ns after R↓, enabling high-speed interface bridging. |
| Read/Write Frequency | Up to 40 MHz - supports 25 ns cycle time for both read and write operations under nominal conditions. |
| Status Flags | EF (empty), FF (full), XO/HF (half-full or expansion-out) - hardware-generated, no software polling required. |
| Operating Temperature | 0°C to 70°C - commercial-grade specification suitable for industrial embedded and data-acquisition environments. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic rails and robust against supply ripple. |
| I/O Compatibility | TTL-compatible inputs - interfaces directly with 74ACT, 74LS, and other 5 V logic families without level shifters. |
Pinout & Package
SN74ACT7201LA15RJR is supplied in a 32-pin plastic J-leaded chip-carrier (RJ) package, with 28 functional pins and 4 NC (no internal connection) terminals per datasheet Figure 1 (RJ PACKAGE TOP VIEW).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D8 | Data inputs | 9-bit parallel write data bus; sampled on falling edge of W when FF = H. |
| Q0–Q8 | Data outputs | 9-bit parallel read data bus; enabled on falling edge of R when EF = H; high-impedance when R = H or EF = L. |
| W | Write-enable input | Falling-edge-triggered write strobe; initiates storage of D0–D8 into next available location if FF = H. |
| R | Read-enable input | Falling-edge-triggered read strobe; shifts next word to Q0–Q8 if EF = H; leaves pointer unchanged if EF = L. |
| RS | Reset input | Active-low synchronous reset; forces read/write pointers to location zero and sets EF = L, FF = H, XO/HF = H. |
| FL/RT | First-load/retransmit input | Configurable: low = first-device marker in depth expansion; high + pulse = retransmit (read pointer → 0, write pointer unchanged). |
| XI | Expansion-in input | Grounded disables depth expansion (enables FL/RT as retransmit); tied to XO/HF of prior device in daisy chain. |
| XO/HF | Expansion-out/half-full output | When XI = GND: goes low when ≥256 words stored (half of 512); when XI active: pulses to next device at last location. |
| EF | Empty-flag output | Low when read pointer = write pointer - blocks further reads until new data arrives. |
| FF | Full-flag output | Low when write pointer = (read pointer − 1) mod 512 - blocks further writes until data is read. |
| VCC, GND | Power supply | Single 5 V supply; decoupling required per high-speed CMOS practice due to ICC1 = 125 mA peak. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous dual-port operation | Independent R and W controls allow concurrent read/write without arbitration logic or clock domain synchronization. |
| Hardware status flag generation | EF, FF, and XO/HF are generated internally from pointer comparison - eliminates software overhead and latency. |
| Retransmit capability | FL/RT pulse resets read pointer to location zero while preserving write pointer - enables packet retransmission without host CPU intervention. |
| Bit-width and word-depth expansion | Parallel width expansion (multiple devices sharing R/W/RS) and daisy-chained depth expansion (XI→XO) support scalable FIFO capacity. |
| Automatic read/write mode | When EF = L and R held low, next word auto-reads on W pulse; when FF = L and W held low, next word auto-writes on R pulse - simplifies burst transfers. |
Applications
| ADC Data Buffering | Bus Rate Translation |
|---|---|
|
Use Scenario: Interfacing an 8-bit ADC sampling at 20 MSPS to a slower microcontroller bus operating at 5 MHz. IC Role / Device Role / Timing Role: First-in-first-out buffer absorbing burst ADC samples and releasing them at host-controlled pace. Use Value: Prevents sample loss during microcontroller interrupt latency; 512-word depth accommodates >25 µs burst windows. |
Use Scenario: Connecting a fast DSP data bus (40 MHz) to a legacy UART controller running at 1.8432 MHz. IC Role / Device Role / Timing Role: Asynchronous bridge isolating clock domains and smoothing data throughput mismatches. Use Value: Eliminates need for complex handshaking or DMA arbitration; EF/FF flags provide deterministic flow control. |
| Magnetic Storage Interface | Communication Protocol Queue |
|
Use Scenario: Temporary storage of sector data between a floppy disk controller and system memory during read/write operations. IC Role / Device Role / Timing Role: Dual-port FIFO acting as a staging buffer for 9-bit-wide sector payloads (8 data + 1 CRC bit). Use Value: Enables overlap of disk seek time and memory transfer; 9-bit width matches common floppy encoding schemes. |
Use Scenario: Queuing HDLC frames in a point-to-point serial link where transmit and receive paths operate independently. IC Role / Device Role / Timing Role: Dedicated FIFO per channel managing frame ingress/egress with retransmit on NAK. Use Value: FL/RT-driven retransmit allows immediate resend of last frame without host register access or pointer calculation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7201LA | Pin-compatible 512 × 9 FIFO; identical timing (15 ns access), same RJ package; requires separate 5 V supply regulation. | Same use cases but lacks TI's ACT-series TTL compatibility margin; may require tighter VIH/VIL control. | Preferred when sourcing from IDT-dedicated supply chains or when matching existing IDT72xx-based designs. |
| SN74ACT7202LA15RJR | 1024 × 9 organization (2× depth); same 15 ns access, 40 MHz rating, RJ package, and pinout - only differs in memory size. | Used where deeper buffering is needed (e.g., longer burst capture or higher latency interfaces); otherwise drop-in compatible. | Select when >512-word depth is required; no PCB change needed - same footprint and signal routing. |
Compared with IDT7201LA, SN74ACT7201LA15RJR offers broader input voltage tolerance and stronger drive strength; compared with SN74ACT7202LA15RJR, it trades half the depth for lower power and smaller physical footprint in space-constrained layouts.
Availability
SN74ACT7201LA15RJR is available at Aetrix Electronics and suitable for data-acquisition systems, bus bridging modules, and communication protocol stacks requiring stable component supply across extended production lifecycles.
Supply support for SN74ACT7201LA15RJR 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 interface and memory products.
The SN74ACT7201LA15RJR belongs to TI's 74ACT advanced CMOS logic family, engineered for high-speed, low-noise FIFO buffering in industrial and instrumentation applications where deterministic latency and robust flag signaling are critical.
FAQ
What is the memory depth and width of SN74ACT7201LA15RJR?
The SN74ACT7201LA15RJR provides 512 words of storage, each 9 bits wide (D0–D8), supporting byte-plus-parity or 9-bit framing protocols. This 512 × 9 organization is fixed and confirmed in TI SCAS221A Section 1 and functional block diagram (Page 5).
How does the retransmit function work on SN74ACT7201LA15RJR?
Retransmit is activated by pulsing FL/RT low while R and W are high. This resets the internal read pointer to location zero without affecting the write pointer, allowing previously read data to be re-output on subsequent R pulses. The SN74ACT7201LA15RJR datasheet specifies this behavior in the RESET AND RETRANSMIT FUNCTION TABLE (Page 5).
Can SN74ACT7201LA15RJR be used in depth-expansion configurations?
Yes - SN74ACT7201LA15RJR supports daisy-chained depth expansion via XI and XO/HF pins. The first device has FL/RT = L and XI = GND; subsequent devices have FL/RT = H and XI tied to prior XO/HF. All EF/FF signals must be ORed externally, and RT/HF functions are disabled in this mode per Page 17 Application Information.
What are the timing requirements for reliable read/write cycles on SN74ACT7201LA15RJR?
SN74ACT7201LA15RJR requires minimum 15 ns pulse widths for R and W (tw(RL)/tw(WL)), 10 ns high-time (tw(RH)/tw(WH)), and 11 ns data setup before W↑ (tsu(D)). These values are specified for the -15 speed grade in Table 1 (Page 8) and validated under VCC = 4.5–5.5 V and TA = 0–70°C.
Is SN74ACT7201LA15RJR compatible with other members of the 74ACT72xx family?
Yes - SN74ACT7201LA15RJR is fully compatible with SN74ACT7200L and SN74ACT7202LA in pinout, flag behavior, and control logic. Differences are limited to memory depth (256/512/1024 words) and corresponding FF/EF thresholds, as documented in the Organization table (Page 1) and timing tables (Pages 8–9).
SN74ACT7201LA15RJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- 4.5K (512 x 9)
- Function:
- Asynchronous
- Data Rate:
- 40MHz
- Access Time:
- 15ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 125mA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- No
- Retransmit Capability:
- Yes
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC
SN74ACT7201LA15RJR FAQ
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6.How does Aetrix verify that SN74ACT7201LA15RJR is sourced from the original manufacturer or authorized distributors?
All SN74ACT7201LA15RJR 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 SN74ACT7201LA15RJR meets industry standards.
7.What is the process for return or replacement of SN74ACT7201LA15RJR?
All SN74ACT7201LA15RJR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT7201LA15RJR, 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 SN74ACT7201LA15RJR part is unused and in its original packaging.
Return procedure for SN74ACT7201LA15RJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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