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Renesas 7140SA55PF
- Part No.:
- 7140SA55PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140SA55PF.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,058
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Product details
Overview
7140SA55PF from IDT is a 1K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous left/right port access with 55 ns max read/write cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external logic in real-time digital signal processors.
For engineers reviewing the 7140SA55PF datasheet, 7140SA55PF pinout, 7140SA55PF application, or 7140SA55PF equivalent, key selection criteria include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7130SA55PF as MASTER, and 48-pin flatpack (FP48) mechanical and thermal constraints for high-density PCB layouts.
Technical Context
The 7140SA55PF operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL, BUSYR) that inhibit writes when asserted low - unlike the MASTER IDT7130 which drives open-drain BUSY outputs. It lacks internal arbitration logic and relies entirely on external BUSY signaling from the MASTER for contention resolution.
Each port features independent CE, OE, R/W, address (A0–A9), and I/O (I/O0–I/O7) signals, enabling simultaneous but non-conflicting access. The device supports full asynchronous operation: reads and writes may be initiated on either port at any time, provided BUSY inputs are deasserted and timing parameters (tWC = 55 ns, tAA = 55 ns, tAOE = 25 ns) are met.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits); provides byte-wide data path per port for clean integration into 8-bit microcontrollers or DSPs. |
| Access Time (max) | 55 ns; guarantees valid data within 55 ns after address/CE/OE assertion, enabling operation with 18.2 MHz bus clocks. |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V); compatible with standard TTL logic families and eliminates need for voltage regulators in 5V systems. |
| Operating Temperature | –40°C to +85°C; qualified for industrial environments including motor control, PLCs, and telecom line cards. |
| Standby Current (ISB1) | 20 mA max (both ports CE-high); enables low-power hold mode during system sleep without battery backup circuitry. |
| I/O Interface | TTL-compatible inputs/outputs; ensures direct connection to 5V microcontrollers, FPGAs, and ASICs without level-shifting. |
| Package | 48-pin ceramic flatpack (FP48); hermetically sealed, 0.75″ × 0.75″ footprint, suitable for high-reliability and extended-temperature applications. |
Pinout & Package
48-pin ceramic flatpack (FP48) package with 0.75 in × 0.75 in body size and 0.11 in height; pins arranged in single-row configuration with index mark at Pin 1 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary ground return for both ports; must be connected to system ground plane with low-inductance path. |
| CER (Pin 2) | Right port chip enable | Active-low enable for right port memory access; deassertion places I/O7R–I/O0R in high-impedance state. |
| CEL (Pin 3) | Left port chip enable | Active-low enable for left port memory access; controls power-down entry for left-side circuitry. |
| OEL (Pin 4) | Left port output enable | Active-low control for left port output drivers; allows read-only access while preserving write capability. |
| A0L (Pin 5) | Left port address bit 0 | LSB of 10-bit left port address bus; used with A1L–A9L to select one of 1024 memory locations. |
| OER (Pin 6) | Right port output enable | Active-low control for right port output drivers; decouples read functionality from chip enable timing. |
| INTL (Pin 7) | Left port interrupt flag input | Input used to set/clear INTL flag via address 3FEh; requires external pull-up for proper logic level detection. |
| BUSYL (Pin 8) | Left port BUSY input | Active-low signal from MASTER device; when low, inhibits all left port writes regardless of R/WL/CEL state. |
| R/WL (Pin 9) | Left port read/write control | High = read, low = write; controls direction of data flow on I/O7L–I/O0L during enabled cycles. |
| R/WR (Pin 10) | Right port read/write control | High = read, low = write; independent of left port operation; enables true concurrent bidirectional access. |
| BUSYR (Pin 11) | Right port BUSY input | Active-low signal from MASTER device; blocks right port writes during arbitration contention on shared memory location. |
| INTR (Pin 12) | Right port interrupt flag input | Input used to set/clear INTR flag via address 3FFh; supports inter-processor communication without polling. |
| VCC (Pin 13) | Power supply | +5V ±10% supply for core logic and I/O; all VCC pins must be decoupled with 0.1 µF ceramic capacitors near package. |
| A0R (Pin 14) | Right port address bit 0 | LSB of 10-bit right port address bus; enables independent addressing space coexisting with left port. |
| A1R–A9R (Pins 15–24) | Right port address bits 1–9 | Completes 10-bit right port address; allows full 1K address space access independent of left port activity. |
| I/O7R–I/O0R (Pins 25–32) | Right port data bus | Bi-directional 8-bit data path for right port; driven only when CER and OER are active low during read cycles. |
| I/O3L (Pin 33) | Left port data bit 3 | One of eight bidirectional data lines; shares pin function with no multiplexing - simplifies PCB routing. |
| A1L–A9L (Pins 34–42) | Left port address bits 1–9 | Completes 10-bit left port address; permits simultaneous but non-overlapping access to same or different memory locations. |
| I/O0L–I/O2L (Pins 43–45) | Left port data bits 0–2 | Low-order data lines for left port; electrically identical to I/O3L–I/O7L with matched drive strength and timing. |
| I/O7L–I/O4L (Pins 46–48) | Left port data bits 7–4 | High-order data lines for left port; all I/O pins exhibit 9 pF input capacitance and 10 pF output capacitance (STQFP/TQFP packages). |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER, reducing BOM count and layout complexity in 16-bit+ memory expansions. |
| BUSY input-driven write inhibition | Hardware-enforced write blocking on either port when BUSYL/BUSYR is low, preventing data corruption during address contention without software intervention. |
| Dual independent asynchronous ports | Enables real-time data exchange between two processors or DMA engines - e.g., one writing sensor data while another reads for display or analysis. |
| TTL-compatible 5V interface | Direct connectivity to legacy 5V microcontrollers (e.g., 8051, PIC18), FPGAs, and ASICs without level translators or bus buffers. |
| Industrial temperature qualification | Guaranteed operation from –40°C to +85°C supports deployment in harsh environments such as factory automation, energy metering, and transportation systems. |
Applications
| Industrial PLC Memory Expansion | Digital Signal Processor Co-Processing Buffer |
|---|---|
Use Scenario: Expanding local memory in programmable logic controllers to support larger ladder logic programs and real-time I/O buffering. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM providing 1K × 8 byte-wide storage accessible concurrently by CPU (left port) and motion control ASIC (right port). Use Value: Enables deterministic response times by eliminating software-managed memory arbitration; 55 ns access supports 10 kHz servo loop updates. | Use Scenario: Serving as shared data buffer between main DSP core and hardware-accelerated FFT engine in radar signal processing units. IC Role / Device Role / Timing Role: Asynchronous memory conduit allowing continuous streaming of time-domain samples (left port) and frequency-domain results (right port). Use Value: Eliminates pipeline stalls during data handoff; 55 ns tWC ensures <110 ns round-trip latency for 1024-point FFT result transfer. |
| Telecom Line Card Packet Buffer | Avionics Data Acquisition Interface |
Use Scenario: Storing incoming/outgoing packet payloads in T1/E1 line interface cards where framer and host processor require independent memory access. IC Role / Device Role / Timing Role: SLAVE memory node synchronized to IDT7130 MASTER, with left port serving framer ASIC and right port serving PowerPC host. Use Value: Prevents packet loss during burst traffic by decoupling framer write rate (up to 2.048 Mbps) from host read scheduling. | Use Scenario: Capturing synchronized analog-to-digital converter outputs in flight data recorders where sensor acquisition and formatting occur on separate subsystems. IC Role / Device Role / Timing Role: Dual-port SRAM acting as handshake-free buffer between SAR ADC controller (left port) and ARINC 429 formatter (right port). Use Value: Ensures zero-data-loss capture at 1 MSPS sample rate; FP48 package meets DO-160E vibration and thermal shock requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7130SA55PF | MASTER device with on-chip arbitration logic and BUSY outputs; includes INT flag generation and automatic priority resolution. | Required when building standalone dual-port system or when no external MASTER exists; cannot substitute directly due to BUSY output vs. input mismatch. | Select IDT7130SA55PF only as MASTER in paired configurations; never as drop-in replacement for 7140SA55PF. |
| CY7C1342KV18-55BZXI | 1M × 18 QDR SRAM with differential LVDS interfaces, 55 ps clock-to-out, and integrated PLL; requires 1.8V core + 3.3V I/O supplies. | Suitable for high-speed networking ASICs requiring burst-mode transfers; incompatible pinout, voltage, and protocol - not a functional alternative. | Consider only for new designs targeting >200 MHz interface speeds; not viable for 5V TTL-based legacy upgrades. |
Compared with IDT7130SA55PF and CY7C1342KV18-55BZXI, the 7140SA55PF delivers optimized cost and simplicity for industrial 5V systems requiring SLAVE-only expansion, while avoiding over-engineered features like QDR interfaces or embedded arbitration that increase layout and validation effort.
Availability
7140SA55PF is available at Aetrix Electronics and suitable for industrial PLCs, digital signal processor co-processing buffers, telecom line card packet buffers, and avionics data acquisition interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 7140SA55PF 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
IDT (Integrated Device Technology) is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs, acquired by Renesas Electronics in 2019.
The IDT7130/7140 family was designed specifically for high-reliability dual-ported memory expansion in real-time embedded systems where deterministic latency and hardware-enforced arbitration are critical - notably in industrial control, defense, and telecom infrastructure.
FAQ
What is the role of BUSYL and BUSYR on the 7140SA55PF?
On the 7140SA55PF, BUSYL and BUSYR are active-low input signals - not outputs - used to inhibit writes on the respective left or right port when asserted. Unlike the MASTER IDT7130, this SLAVE device does not generate BUSY signals; it responds to them from an external MASTER. When BUSYL is low, all left port writes are blocked regardless of R/WL or CEL state, ensuring data integrity during address contention. This behavior is confirmed in the functional description and Truth Table III of the official datasheet.
Can the 7140SA55PF operate as a standalone dual-port memory without a MASTER device?
No, the 7140SA55PF cannot operate standalone as a dual-port memory because it lacks on-chip arbitration logic and BUSY output capability. It is explicitly designed as a SLAVE device that depends on an external MASTER (e.g., IDT7130SA55PF) to resolve port contention and assert BUSY inputs. Attempting to use the 7140SA55PF alone will result in undefined write behavior during simultaneous access to the same address, as documented in Truth Table III and the "Functional Block Diagram" section of the datasheet.
What is the maximum operating frequency supported by the 7140SA55PF?
The 7140SA55PF does not specify a maximum operating clock frequency because it is an asynchronous SRAM - it has no internal clock. Instead, its speed is defined by timing parameters: maximum read/write cycle time (tWC) is 55 ns, meaning it supports effective throughput up to approximately 18.2 million operations per second under ideal conditions. This value is validated across the industrial temperature range (–40°C to +85°C) and matches the "55ns (max.)" rating listed in the Features section of the datasheet.
Does the 7140SA55PF support battery backup or data retention mode?
No, the 7140SA55PF does not support battery backup or low-voltage data retention. That feature is exclusive to the LA (low-power) variants - specifically IDT7140LA - which guarantee data retention down to 2.0 V. The "SA" suffix in 7140SA55PF denotes standard active power consumption (550 mW typ.), and the datasheet confirms battery backup capability applies only to LA versions in the "Data Retention Characteristics" table (Table 07) and related waveform diagrams.
Which package type corresponds to the 'PF' suffix in 7140SA55PF?
The 'PF' suffix in 7140SA55PF stands for 48-pin ceramic flatpack (FP48), as confirmed in the "Pin Configurations" section (Drawing 03F) and ordering information tables of the datasheet. This hermetically sealed package measures approximately 0.75 in × 0.75 in × 0.11 in and is qualified for industrial and military applications. It is distinct from DIP, LCC, PLCC, and TQFP variants - all of which use different suffixes (e.g., 'PFI', 'LCC', 'PL', 'TQ').
7140SA55PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
7140SA55PF FAQ
1.How can I place an order for 7140SA55PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA55PF 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 7140SA55PF reliable?
The price and inventory of 7140SA55PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA55PF is usually 5 days.
3.What payment methods are accepted for 7140SA55PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA55PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA55PF?
7140SA55PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA55PF 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 7140SA55PF?
For technical support, including 7140SA55PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA55PF requirements.
6.How does Aetrix verify that 7140SA55PF is sourced from the original manufacturer or authorized distributors?
All 7140SA55PF 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 7140SA55PF meets industry standards.
7.What is the process for return or replacement of 7140SA55PF?
All 7140SA55PF units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA55PF, 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 7140SA55PF part is unused and in its original packaging.
Return procedure for 7140SA55PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA55PF Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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