My Inquiry
My Account
Renesas 70V28L20PF8
- Part No.:
- 70V28L20PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70V28L20PF8.pdf
- Description:
- IC SRAM 1MBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,444
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
70V28L20PF8 from Integrated Device Technology is a high-speed 3.3V 64K × 16 true dual-ported static RAM with independent left/right ports, 20 ns max access time (industrial/commercial), LVTTL-compatible I/O, and on-chip semaphore/arbiration logic for multiprocessor synchronization. It operates across –40°C to +85°C and supports master/slave cascading for 32-bit+ bus expansion in real-time control systems.
For engineers reviewing the 70V28L20PF8 datasheet, 70V28L20PF8 pinout, 70V28L20PF8 application, or 70V28L20PF8 equivalent, this page delivers verified timing specs, BUSY/INT/SEM behavior, TQFP-100 package mapping, industrial-grade power-down current (ISB3 = 0.2 mA typ.), and dual-port arbitration constraints - all critical for deterministic multi-CPU memory sharing.
Technical Context
The 70V28L20PF8 implements fully asynchronous dual-port operation: each port (left/right) has dedicated address (A0–A15), data (I/O0–I/O15), and control lines (CE0/CE1, R/W, OE, UB/LB, SEM), enabling simultaneous read/write to any memory location without internal contention except at shared addresses. Its hardware BUSY logic detects address matches and gates writes on the delayed port when M/S = VIH.
It integrates eight independent semaphore latches (addressed via A0–A2) accessible only when CE = VIH and SEM = VIL, supporting token-passing resource locking without software overhead. Interrupt flags (INTL/INTR) are triggered by writes to FFFEH (left) or FFFFH (right), with reset via read/write per Truth Table IV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 16 bits (1024 Kbit total); enables standalone or cascaded 32-bit+ memory systems |
| Access Time (tAA) | 20 ns max (industrial & commercial); guarantees deterministic latency for real-time processor handshaking |
| Supply Voltage | 3.3 V ± 0.3 V; LVTTL-compatible I/O eliminates level-shifting in 3.3V systems |
| Standby Current (ISB3) | 0.2 mA typ. (full CMOS standby); enables ultra-low-power sleep modes in battery-backed controllers |
| Operating Temperature | –40°C to +85°C; qualified for industrial embedded environments including motor drives and PLCs |
| Package | 100-pin TQFP (14 mm × 14 mm × 1.4 mm); surface-mount compatible with standard reflow profiles |
| BUSY Logic Type | Push-pull output (no pull-up required); asserts within 20 ns of address match to stall contending writes |
Pinout & Package
70V28L20PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet Note 1–2; NC pins are not internally bonded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE0L, CE1L / CE0R, CE1R | Dual-port chip enables | Independent TTL/CMOS-selectable enable per port; enables depth expansion without external logic |
| R/WL, R/WR | Read/write direction control | Active-low; controls data flow direction per port; used with CE to gate write cycles |
| OEL, OER | Output enable | Tri-states I/O drivers independently; allows byte-wide reads without affecting other port activity |
| UBL, UBR / LBL, LBR | Upper/lower byte select | Enables 8-bit granularity access; supports multiplexed bus matching and mixed-width peripherals |
| SEML, SEMR | Semaphore enable | Activates 8-bit semaphore latch access when CE = VIH; isolates semaphore from main memory array |
| BUSYL, BUSYR | Busy flag I/O | Push-pull output (M/S = VIH) or input (M/S = VIL); provides hardware arbitration signal with 20 ns tBAA |
| INTL, INTR | Interrupt flag | Non-tri-state totem-pole outputs; set/cleared by writes/reads to FFFEH/FFFFH per Truth Table IV |
| M/S | Master/slave select | VIH configures BUSY as output (master mode); VIL configures BUSY as write-inhibit input (slave mode) |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port architecture | Simultaneous independent read/write to same memory location enabled; no internal arbitration delay for non-conflicting accesses |
| Hardware semaphore support | Eight dedicated latches (A0–A2) with atomic write/read; eliminates software spinlocks and ensures deterministic resource allocation |
| Automatic power-down | ISB3 = 0.2 mA typ. achieved when both CE and SEM inputs held > VCC−0.2 V or < 0.2 V; reduces idle power in multi-processor systems |
| Master/slave cascading | Single M/S pin enables 32-bit+ word systems using multiple 70V28L20PF8 devices without external glue logic |
| Industrial temperature range | –40°C to +85°C operation validated per datasheet; suitable for factory automation and transportation electronics |
Applications
| Motor Control System | Industrial PLC Memory Hub |
|---|---|
Use Scenario: Two real-time CPUs (motion controller + safety monitor) share status registers and command buffers in a servo drive. IC Role / Device Role / Timing Role: 70V28L20PF8 serves as synchronized shared memory with hardware BUSY arbitration preventing concurrent writes to torque limit registers. Use Value: Eliminates software polling delays; 20 ns tAA ensures motion loop updates complete within 50 µs cycle time. |
Use Scenario: PLC main CPU and I/O processor exchange cyclic process data and diagnostics via mailbox memory. IC Role / Device Role / Timing Role: 70V28L20PF8 provides interrupt-driven message passing (INTL/INTR) and semaphore-protected configuration registers. Use Value: Reduces inter-processor latency to <100 ns; ISB3 = 0.2 mA typ. extends runtime in battery-backed backup mode. |
| Avionics Data Concentrator | Medical Imaging Subsystem |
Use Scenario: Flight computer and sensor fusion unit exchange calibrated ADC samples and health metrics in DO-254-compliant hardware. IC Role / Device Role / Timing Role: 70V28L20PF8 acts as fault-tolerant dual-port buffer with M/S-configured slave mode disabling BUSY output to prevent spurious stalls. Use Value: Push-pull BUSY outputs eliminate external pull-ups; TQFP-100 meets aerospace thermal cycling requirements. |
Use Scenario: MRI subsystem uses two DSPs to concurrently process raw k-space data and generate real-time preview images. IC Role / Device Role / Timing Role: 70V28L20PF8 enables zero-wait-state data exchange between processors using semaphore-locked DMA buffers. Use Value: 64K × 16 capacity stores 128 KB of interleaved image tiles; 3.3V supply simplifies power design in compact modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1370D-200BAXI | 200 MHz QDR interface; 3.3V core but 2.5V I/O; no built-in semaphore logic | Requires external arbitration logic for multi-CPU use; optimized for burst streaming, not discrete mailbox access | Choose for high-throughput FIFO buffering where semaphores are handled in firmware |
| AS7C362000B-20TIN | 20 ns access; 128K × 16 organization; no BUSY/INT/SEM pins; single-port only | Lacks hardware arbitration - unsuitable for real-time dual-CPU synchronization without external logic | Choose only for cost-sensitive, non-concurrent access scenarios requiring larger density |
Compared with CY7C1370D-200BAXI and AS7C362000B-20TIN, the 70V28L20PF8 uniquely delivers integrated semaphore, BUSY, and interrupt logic in a pin-compatible 100-TQFP package - eliminating external components needed for deterministic multi-processor memory sharing.
Availability
70V28L20PF8 is available at Aetrix Electronics and suitable for industrial automation, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for 70V28L20PF8 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
Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The 70V28L20PF8 belongs to IDT's legacy dual-port SRAM family engineered specifically for deterministic multi-processor synchronization in real-time embedded systems - emphasizing hardware arbitration, low-latency access, and industrial reliability.
FAQ
What is the maximum operating temperature range for the 70V28L20PF8?
The 70V28L20PF8 is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the Absolute Maximum Ratings table and DC Operating Conditions section of the official datasheet. This range applies to all speed grades including the 20 ns version, making it suitable for harsh-environment applications like factory automation and transportation electronics.
Does the 70V28L20PF8 support true simultaneous read/write operations on both ports?
Yes, the 70V28L20PF8 implements true dual-port architecture allowing independent, asynchronous read or write access to any memory location from either port. Simultaneous access to the same address triggers BUSY arbitration, but non-conflicting accesses (different addresses) incur zero performance penalty - a key feature validated in the Functional Block Diagram and Truth Table II.
How does the semaphore functionality work on the 70V28L20PF8?
The 70V28L20PF8 includes eight dedicated semaphore latches addressed by A0–A2. They are accessed only when CE = VIH and SEM = VIL (per Truth Table III). Writing "0" to I/O0 sets the flag; reading returns the value across all I/O lines. This hardware token-passing mechanism avoids software overhead and ensures deterministic resource locking between processors.
What is the purpose of the M/S pin on the 70V28L20PF8?
The M/S pin configures the 70V28L20PF8 as either master (M/S = VIH) or slave (M/S = VIL). In master mode, BUSYL/BUSYR are push-pull outputs signaling address contention. In slave mode, they become write-inhibit inputs - allowing external arbitration while disabling internal BUSY generation. This flexibility supports both autonomous and centrally controlled multi-device systems.
Is the 70V28L20PF8 RoHS compliant and halogen-free?
Yes, the 70V28L20PF8 is a green part per the datasheet's Features section ("Green parts available, see ordering information") and complies with RoHS Directive 2011/65/EU. The "PF8" suffix denotes lead-free, halogen-free packaging in a 100-pin TQFP - verified in IDT's official ordering information and material declarations.
70V28L20PF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 1Mbit
- Memory Organization:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x14)
70V28L20PF8 FAQ
1.How can I place an order for 70V28L20PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V28L20PF8 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 70V28L20PF8 reliable?
The price and inventory of 70V28L20PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V28L20PF8 is usually 5 days.
3.What payment methods are accepted for 70V28L20PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V28L20PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V28L20PF8?
70V28L20PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V28L20PF8 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 70V28L20PF8?
For technical support, including 70V28L20PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V28L20PF8 requirements.
6.How does Aetrix verify that 70V28L20PF8 is sourced from the original manufacturer or authorized distributors?
All 70V28L20PF8 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 70V28L20PF8 meets industry standards.
7.What is the process for return or replacement of 70V28L20PF8?
All 70V28L20PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V28L20PF8, 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 70V28L20PF8 part is unused and in its original packaging.
Return procedure for 70V28L20PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V28L20PF8 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
