Infineon Technologies CY7C038V-20AI

Overview

CY7C038V-20AI from Cypress Semiconductor is a 64K × 18-bit true dual-port static RAM with independent left/right ports, 20 ns maximum access time, 5 V supply, and industrial temperature range (–40°C to +85°C). It integrates on-chip arbitration logic, semaphores, BUSY/INT flags, and Master/Slave pin for 36-bit expansion-used in interprocessor communication buffers and video frame memory subsystems.

For engineers reviewing the CY7C038V-20AI datasheet, CY7C038V-20AI pinout, CY7C038V-20AI application, or CY7C038V-20AI equivalent, key selection criteria include simultaneous port access timing, semaphore-controlled resource sharing, byte-selectable I/O (UBL/LBL), CMOS-level standby current (0.05 mA), and TQFP-100 package compatibility with legacy dual-port memory designs.

Technical Context

This device implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0–A15, I/O0–I/O17, CE0/CE1, R/W, OE, UBL/LBL, BUSY, INT, SEM). Arbitration resolves contention when both ports access the same memory location, asserting BUSY and enabling software handshaking via eight shared semaphores.

It supports data retention mode at VCCDR ≥ 2.0 V with ICCDR1 ≤ 1.5 mA, and features automatic power-down per port controlled by CE pins. The M/S pin configures master/slave behavior for seamless 36-bit bus expansion without external logic-critical for high-throughput multiprocessor interconnects.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Plastic Flatpack (TQFP), RoHS-compliant, body size 14 mm × 14 mm, lead pitch 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L15PF and CY7C028V-20AC, CY7C038V-20AI uniquely delivers 18-bit width, integrated Master/Slave expansion, and full semaphore set in a 5 V industrial package-making it the sole option for deterministic 36-bit interprocessor buffers requiring byte-granular control and legacy voltage compatibility.

Availability

CY7C038V-20AI is available at Aetrix Electronics and suitable for interprocessor communication buffers, video frame memory subsystems, industrial PLC I/O mapping, and telecom line card status buffering requiring stable component supply across extended product lifecycles.

Supply support for CY7C038V-20AI 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability memory and programmable solutions for industrial, automotive, and communications infrastructure.

CY7C038V-20AI belongs to the CY7C037/038 dual-port SRAM product line, engineered specifically for deterministic, low-latency shared memory in multiprocessor systems where hardware arbitration and software handshaking are critical.

FAQ

What is the function of the M/S pin on CY7C038V-20AI?

The M/S (Master/Slave) pin configures the device as either master or slave in multi-chip 36-bit memory expansions. When asserted HIGH, it enables master mode (BUSY output); LOW sets slave mode (BUSY input). This eliminates external logic for bus-width scaling and ensures synchronized arbitration across devices.

How does the semaphore logic operate in CY7C038V-20AI?

The device contains eight dedicated semaphore latches accessible via SEM enable and address lines. Each latch can be locked/unlocked by one port at a time, providing hardware-enforced mutual exclusion for shared resources. Semaphore update pulse width is guaranteed at 10 ns (tSOP), and flag write-to-read delay is 5 ns (tSWRD).

Can CY7C038V-20AI operate in data retention mode, and what are the requirements?

Yes-it supports data retention at VCCDR ≥ 2.0 V with ICCDR1 ≤ 1.5 mA. To enter retention mode: CE must be held HIGH within VCC to VCC – 0.2 V; CE transitions must stay between VCC – 0.2 V and 70% of VCC during power-up/down; and operation resumes >20 ns after VCC reaches 4.5 V.

What is the difference between ISB1, ISB2, ISB3, and ISB4 standby current specifications?

ISB1: Both ports at TTL input levels (CE ≥ VIH); ISB2: One port at TTL level, other active; ISB3: Both ports at CMOS level (CE ≥ VCC – 0.2 V, f = 0); ISB4: One port at CMOS level, other at TTL. ISB3 (0.05 mA typ) represents the lowest power hold state for long-term data retention.