Renesas 7024S20PF8

Overview

7024S20PF8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 20 ns max access time (commercial/industrial), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous read/write access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7024S20PF8 datasheet, 7024S20PF8 pinout, 7024S20PF8 application, or 7024S20PF8 equivalent, key selection considerations include BUSY flag timing (tBAA ≤ 20 ns), dual-port arbitration latency, byte-selectable I/O control (UBL/LBL), battery-backed data retention at 2V (L-version), and compatibility with 84-pin PLCC packaging.

Technical Context

The 7024S20PF8 implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag signaling and automatic priority resolution when both ports access the same address - critical for lock-free inter-processor communication.

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB&LB = VIH, SEM = VIL), with dedicated timing parameters (e.g., tSAA ≤ 20 ns, tSWRD = 5 ns) ensuring deterministic flag synchronization between ports.

Key Specifications

Pinout & Package

7024S20PF8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in, with gull-wing leads and internal heat slug. Pin 1 marked by corner notch; pin numbering follows standard PLCC CCW sequence starting at notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C024AV-20AXC and IDT70V24L20PF8, the 7024S20PF8 uniquely combines 5V TTL compatibility, 84-pin PLCC packaging, and industrial temperature support - making it irreplaceable in legacy avionics and industrial control upgrades where board re-spin is prohibited.

Availability

7024S20PF8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data concentrators, and redundant communication controllers requiring stable component supply across extended product lifecycles.

Supply support for 7024S20PF8 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 high-performance timing, memory, and interface solutions, now part of Renesas Electronics.

The IDT7024 family was designed specifically for real-time embedded systems requiring deterministic, collision-free inter-processor communication - targeting aerospace, industrial automation, and telecom infrastructure applications.

FAQ

What is the maximum operating frequency supported by the 7024S20PF8?

The 7024S20PF8 does not operate on a clock; it is a fully asynchronous SRAM. Its 20 ns maximum access time corresponds to a theoretical maximum sustained read/write cycle rate of 50 MHz (1/20 ns). Real-world throughput depends on system-level timing margins, bus loading, and control signal setup/hold compliance - not a fixed clock frequency.

Does the 7024S20PF8 support battery backup operation?

The 7024S20PF8 is the "S" (standard power) variant and does not support battery backup data retention. Only the "L" (low-power) variant (e.g., 7024L20PF8) guarantees data retention at 2V. The 7024S20PF8 requires continuous 5V supply for volatile operation - applying 2V will result in undefined or corrupted data.

How does the M/S pin affect BUSY signal behavior on the 7024S20PF8?

When M/S = HIGH, the 7024S20PF8 operates as a master: BUSYL and BUSYR are driven outputs indicating port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs, allowing external arbitration. This enables flexible master/slave cascading without external logic - critical for expanding data bus width beyond 16 bits.

Can the 7024S20PF8 be used in a single-port configuration?

Yes - the 7024S20PF8 can be operated as a single-port SRAM by tying one port's CE permanently HIGH and using only the other port's address, data, and control lines. All dual-port features (BUSY, semaphore, arbitration) remain functional but unused. This provides design flexibility and backward compatibility in systems upgrading from single-port to dual-port architectures.

What is the purpose of the SEM pin on the 7024S20PF8?

The SEM (Semaphore Enable) pin selects between RAM array access (SEM = VIH) and eight-register semaphore flag access (SEM = VIL). When accessing semaphores, A0–A2 address the flag, I/O0 writes the value, and all I/O lines (I/O0–I/O15) output the flag state - enabling hardware-accelerated resource locking without CPU intervention or memory-mapped I/O overhead.