70V05L20PFGI - 64Kbit 3.3V 20ns Dual-Port SRAM | Renesas
MPN: 70V05L20PFGI ✓ Hoạt động70V05L20PFGI Tóm tắt
A Dual-Port SRAM (DPRAM) is a specialized static memory that exposes two independent read/write ports to the same storage array, enabling concurrent access from two buses or processors without external arbitration logic. This architecture eliminates shared-bus contention and is widely used in multiprocessor designs, DSP-to-CPU mailbox regions, and data-pipeline buffering. Within the broader memory hierarchy, DPRAM sits between single-port SRAM (lower cost, no concurrency) and FIFO/SDRAM (higher density, more complex control).
Key features of the 70V05L20PFGI include 20 ns access time, low operating power of approximately 400 mW typical, on-chip port-collision logic with BUSY flag signaling, MASTER/SLAVE mode for 16-bit or wider word expansion without external glue logic, and a 3.3V ± 0.3V single supply. The device is fabricated in a high-performance CMOS process and supports both read/write contention detection flags.
The 70V05L architecture uses an 8-transistor SRAM cell with full CMOS six-transistor-equivalent stability, giving the part excellent noise immunity and data retention. Internal busy-flag arbitration prevents data corruption when both ports access the same address simultaneously, and MASTER/SLAVE handshaking lets engineers cascade multiple 70V05L devices to build 16-bit, 24-bit, or 32-bit dual-port memory banks with full-speed, error-free operation.
Typical applications include inter-processor shared memory in telecom/datacom switches, DSP/FPGA mailbox and data-exchange buffers, industrial motion-control shared RAM, medical-imaging pipeline buffers, and point-to-point FIFO replacement in parallel backplane designs. The wide-voltage 3.3V ± 0.3V tolerance makes the part compatible with both 3.3V LVCMOS and 3.3V LVTTL logic families.
When designing with this device, ensure that BUSY-flag timing is met under worst-case loading, and that MASTER/SLAVE mode is correctly wired when expanding word width. Decoupling capacitors of 0.1 µF and 10 µF placed close to VCC pins are recommended for stable operation across the industrial temperature range.
This page synthesizes distributor pricing, drop-in alternative listings, and practical design notes that complement the manufacturer datasheet to accelerate part selection.
Bộ thay thế dễ dàng lắp đặt cho 70V05L20PFGI — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
70V05S20PFGI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
70V05L25PFGI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
70V05S25PFGI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
70V05L35PFGI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
70V06L55PFGI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
70V05L20PFGI Tỷ lệ tối đa & tính chất điện
| Kiểu bộ nhớ | Dual-Port Static RAM (Asynchronous) |
| Memory Organization | 8K x 8 (64 Kbit) |
| Access Time | 20 ns |
| Supply Voltage (VCC) | 3.0 V to 3.6 V (3.3 V nominal) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Number of Ports | 2 (independent) |
| Bus Width | 8 bits per port |
| On-chip Arbitration | Yes, BUSY flag for write collision |
| MASTER/SLAVE Mode | Yes, for 16-bit or wider expansion |
| Hộp | 64-pin TQFP (14x14 mm) |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free / RoHS | Lead-free, RoHS compliant |
| Technology | High-performance CMOS |
| Manufacturer | Renesas Electronics (formerly IDT) |
Cấu hình chân 70V05L20PFGI
| Chân 1 | NC — Not connected (per datasheet) |
| Chân 2 | A0L — Left Port Address A0 |
| Chân 3 | A1L — Left Port Address A1 |
| Chân 4 | A2L — Left Port Address A2 |
| Chân 5 | A3L — Left Port Address A3 |
| Chân 6 | A4L — Left Port Address A4 |
| Chân 7 | A5L — Left Port Address A5 |
| Chân 8 | A6L — Left Port Address A6 |
| Chân 9 | A7L — Left Port Address A7 |
| Chân 10 | A8L — Left Port Address A8 |
| Chân 11 | A9L — Left Port Address A9 |
| Chân 12 | A10L — Left Port Address A10 |
| Chân 13 | A11L — Left Port Address A11 |
| Chân 14 | A12L — Left Port Address A12 |
| Chân 15 | CEL — Left Port Chip Enable (active low) |
| Chân 16 | OEL — Left Port Output Enable (active low) |
| Chân 17 | R/WL — Left Port Read/Write (active low write) |
| Chân 18 | BUSYL — Left Port Busy Flag |
| Chân 19 | INTL — Left Port Interrupt Flag |
| Chân 20 | GND — Ground |
| Chân 21 | GND — Ground |
| Chân 22 | GND — Ground |
| Chân 23 | I/O0L — Left Port Data I/O 0 |
| Chân 24 | I/O1L — Left Port Data I/O 1 |
| Chân 25 | I/O2L — Left Port Data I/O 2 |
| Chân 26 | I/O3L — Left Port Data I/O 3 |
| Chân 27 | I/O4L — Left Port Data I/O 4 |
| Chân 28 | I/O5L — Left Port Data I/O 5 |
| Chân 29 | I/O6L — Left Port Data I/O 6 |
| Chân 30 | I/O7L — Left Port Data I/O 7 |
| Chân 31 | VCC — Power Supply (3.3V) |
| Chân 32 | VCC — Power Supply (3.3V) |
| Chân 33 | VCC — Power Supply (3.3V) |
| Chân 34 | M/S — Master/Slave select |
| Chân 35 | I/O7R — Right Port Data I/O 7 |
| Chân 36 | I/O6R — Right Port Data I/O 6 |
| Chân 37 | I/O5R — Right Port Data I/O 5 |
| Chân 38 | I/O4R — Right Port Data I/O 4 |
| Chân 39 | I/O3R — Right Port Data I/O 3 |
| Chân 40 | I/O2R — Right Port Data I/O 2 |
| Chân 41 | I/O1R — Right Port Data I/O 1 |
| Chân 42 | I/O0R — Right Port Data I/O 0 |
| Chân 43 | GND — Ground |
| Chân 44 | GND — Ground |
| Chân 45 | GND — Ground |
| Chân 46 | INTR — Right Port Interrupt Flag |
| Chân 47 | BUSYR — Right Port Busy Flag |
| Chân 48 | R/WR — Right Port Read/Write (active low write) |
| Chân 49 | OER — Right Port Output Enable (active low) |
| Chân 50 | CER — Right Port Chip Enable (active low) |
| Chân 51 | A12R — Right Port Address A12 |
| Chân 52 | A11R — Right Port Address A11 |
| Chân 53 | A10R — Right Port Address A10 |
| Chân 54 | A9R — Right Port Address A9 |
| Chân 55 | A8R — Right Port Address A8 |
| Chân 56 | A7R — Right Port Address A7 |
| Chân 57 | A6R — Right Port Address A6 |
| Chân 58 | A5R — Right Port Address A5 |
| Chân 59 | A4R — Right Port Address A4 |
| Chân 60 | A3R — Right Port Address A3 |
| Chân 61 | A2R — Right Port Address A2 |
| Chân 62 | A1R — Right Port Address A1 |
| Chân 63 | A0R — Right Port Address A0 |
| Chân 64 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
70V05L20PFGI phù hợp cho 6 Áp dụngs: Inter-Processor Shared Memory, DSP/FPGA Data Exchange Buffer, Industrial Motion Control Shared RAM, Telecom Switching Fabric Buffer, Medical Imaging Pipeline Buffer, Point-to-Point FIFO Replacement.
Inter-Processor Shared Memory
The 70V05L20PFGI provides true simultaneous dual-port access for two microprocessors or DSP cores that must exchange data without bus arbitration latency. Its 20 ns access time supports bus cycles up to 50 MHz, while the on-chip BUSY flag prevents write collisions when both ports target the same address. Compared with single-port SRAM plus software semaphore, the hardware dual-port reduces interrupt latency and eliminates the need for shared-bus locking primitives. Placed between a host CPU and a DSP in telecom baseband cards, the device delivers deterministic mailbox and command-queue performance.
Được đề xuất
DSP/FPGA Data Exchange Buffer
In FPGA co-processing pipelines, the 70V05L20PFGI acts as a wide bidirectional buffer between the FPGA data plane and a host DSP/MCU control plane. The two independent 8-bit ports with separate address and control buses allow the FPGA to write processed blocks while the host reads completed frames in parallel. The 20 ns access time keeps up with most FPGA fabric clock rates and the 3.3V supply aligns with LVCMOS FPGA I/O standards. Unlike FIFOs that lose depth visibility, dual-port SRAM allows random-access reads and writes, simplifying state-machine buffer management.
Được đề xuất
Industrial Motion Control Shared RAM
Motion controllers frequently use a servo loop processor paired with a supervisory PLC, and the 70V05L20PFGI provides the shared memory region where trajectory setpoints, encoder feedback, and status flags are exchanged. Industrial -40 C to +85 C operation supports factory-floor deployments. The MASTER/SLAVE expansion mode lets designers grow the data bus from 8 bits to 16 or 32 bits for higher-resolution position data without external arbitration logic. The robust CMOS cell ensures data retention through motor-drive-induced EMI events typical of industrial cabinets.
Được đề xuất
Telecom Switching Fabric Buffer
In telecom line-card and switching applications, the 70V05L20PFGI serves as a small shared buffer between the framer ASIC and the network processor. The two ports allow the framer to write incoming cell payloads while the network processor reads routing-decision results concurrently. 3.3V ± 0.3V supply aligns with telecom board rails and the 20 ns access keeps up with OC-3/STM-1 byte-rate streams. Compared with off-chip SDRAM, dual-port SRAM provides deterministic read/write latency critical for traffic shaping and QoS scheduling.
Được đề xuất
Medical Imaging Pipeline Buffer
Ultrasound and portable X-ray imaging pipelines use a data-acquisition ASIC or FPGA to fill image lines while a host processor reads completed scan frames. The 70V05L20PFGI acts as a ping-pong line buffer that decouples acquisition from display rendering, eliminating frame tearing. The 64 Kbit capacity is sufficient for one or two scan lines at typical resolution. Industrial temperature rating and low-power CMOS design support portable battery-powered medical devices where thermal budget is constrained.
Được đề xuất
Point-to-Point FIFO Replacement
Engineers often use the 70V05L20PFGI as a dual-port SRAM substitute for dedicated FIFOs when random-access visibility into the buffer is required. Two ports map naturally onto a producer/consumer pair, and the BUSY flag prevents data corruption in tight timing margins. MASTER/SLAVE expansion allows deeper buffers without sacrificing throughput. The 3.3V ± 0.3V tolerance and TQFP-64 footprint suit retrofits into legacy FIFO sockets where additional control signals are needed beyond standard FIFO flags.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho 70V05L20PFGI — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 70V05S20PFGI | 70V05L25PFGI | 70V05S25PFGI | 70V05L35PFGI | 70V06L55PFGI |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (14x14 mm) | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same | TQFP-64 (14x14 mm) - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Memory Organization | 8K x 8 (64 Kbit) | 8K x 8 (64 Kbit) | 8K x 8 (64 Kbit) | 8K x 8 (64 Kbit) | 8K x 8 (64 Kbit) | 16K x 8 (128 Kbit) |
| Access Time | 20 ns | 20 ns | 25 ns | 25 ns | 35 ns | 55 ns |
| Power Class | Low Power (L) | Standard (S) | Low Power (L) | Standard (S) | Low Power (L) | Low Power (L) |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| BUSY Arbitration | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) | Yes (on-chip) |
| MASTER/SLAVE Mode | Yes | Yes | Yes | Yes | Yes | Yes |
| Unit Price (qty 100) | $19.60 | $18.10 | $17.65 | $16.85 | $15.20 | $22.40 |
Bảo phân biệt quan trọng
- True dual-port simultaneous access with on-chip arbitration (vsCY7C1338 (synchronous pipelined SRAM, not true dual-port))
- 20 ns access speed (fastest grade in 70V05L family) (vs70V05L25PFGI (25 ns variant))
- Low-power (L) variant for thermally constrained designs (vs70V05S20PFGI (standard power, same 20 ns speed))
Ghi chú thiết kế
Estimated: at VCC = 3.3V and full 50 MHz bus cycle on both ports, the 70V05L20PFGI L-grade typically draws about 400 mW (per Renesas datasheet typical power figure). Provide at least four VCC/GND pins in parallel and place 0.1 µF ceramic decoupling capacitors adjacent to each VCC pin to suppress transient current spikes during simultaneous port transitions. A bulk 10 µF tantalum or ceramic cap on the supply rail near the device is recommended for industrial systems with noisy 3.3V rails.
Estimated: When cascading two 70V05L20PFGI devices for 16-bit MASTER/SLAVE operation, the M/S pin must be tied high on the master and low on the slave, and the master's BUSYL output must be wired to the slave's BUSYR (or vice versa, depending on which port acts as the arbitrating side). A common mistake is leaving the M/S pin floating, which causes indeterminate role assignment at power-up. Verify timing margin for the BUSY flag propagation delay (typically 15 ns worst case) at your worst-case operating temperature before committing to layout.
Place the device close to the two processors that share it to minimize address and data trace lengths, since 20 ns access time at 50 MHz corresponds to a tight 20 ns timing budget per bus cycle. Route the BUSY flag as a guarded trace or keep it short to avoid crosstalk-induced false-busy assertions. Provide a solid ground plane under the TQFP-64 package to reduce EMI and ensure stable VCC reference, and follow JEDEC J-STD-020 lead-free reflow profiles for the TQFP-64 footprint.
Thông tin tuân thủ
RoHS and lead-free per Renesas product page. Not AEC-Q100 qualified (industrial grade only). For automotive applications, contact Renesas for Q-grade part numbers.
