Cypress Semiconductor Corp CY7C0851AV-133AXC

Overview

CY7C0851AV-133AXC from Cypress Semiconductor is a 3.3V synchronous true dual-port SRAM with 2-Mbit (64K × 36) organization, pipelined output mode, and 172-ball FBGA (15 mm × 15 mm) package. It supports simultaneous independent read/write access on left and right ports, delivers 4.0 ns clock-to-data access time at 167 MHz max, and features mailbox interrupt logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the CY7C0851AV-133AXC datasheet, CY7C0851AV-133AXC pinout, CY7C0851AV-133AXC application, or CY7C0851AV-133AXC equivalent, key selection criteria include dual-port arbitration timing, counter wrap-around control via CNT/MSK pins, JTAG boundary-scan support, and industrial temperature range (–40°C to +85°C) compliance for high-reliability data buffering.

Technical Context

This device implements two fully independent synchronous interfaces-left port (A0L–A17L, DQ0L–DQ35L, CLKL, R/WL) and right port (A0R–A17R, DQ0R–DQ35R, CLKR, R/WR)-with pipelined address registration and self-timed internal write pulses. Each port includes a programmable 18-bit burst address counter with mask register control, counter-interrupt flags (CNTINTL/CNTINTR), and mirror registers for address readback.

It integrates IEEE 1149.1 JTAG boundary scan, asynchronous master reset (MRST), separate byte enables (B0–B3 per port), and dual chip enables (CE0 active-low, CE1 active-high) per port for depth expansion. The 0.18-μm CMOS process enables 225 mA typical active current and 55 mA standby current at 3.3 V.

Key Specifications

Pinout & Package

Package: 172-ball Fine-Pitch Ball Grid Array (FBGA), 1 mm pitch, 15 mm × 15 mm body size, RoHS-compliant. Pinout validated per Cypress Document #38-06070 Rev. *H, Figures 1–2 (pages 4–5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L15PF8 and IS61WV102432BLL-15BLI, CY7C0851AV-133AXC uniquely combines 167 MHz speed, hardware mailbox interrupts, and programmable burst counters in a compact FBGA - making it optimal for real-time inter-processor communication where latency, determinism, and footprint are critical.

Availability

CY7C0851AV-133AXC is available at Aetrix Electronics and suitable for telecom line card buffering, industrial PLC dual-CPU coherence, avionics data concentrators, and medical imaging pipeline buffering requiring stable component supply across extended product lifecycles.

Supply support for CY7C0851AV-133AXC 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-performance memory and programmable solutions for industrial, automotive, and communications infrastructure markets.

CY7C0851AV belongs to the FLEx36™ family of synchronous dual-port SRAMs, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems with strict timing and reliability requirements.

FAQ

What is the function of the CNT/MSK pin on CY7C0851AV-133AXC?

The CNT/MSK pin (active-low) controls access to the burst address counter and mask register. When asserted LOW, the current counter value or mask register contents appear on the address bus (A0–A17) for readback. When HIGH, normal address decoding and counter increment operations proceed. This enables runtime inspection of counter state without halting memory operations.

Can CY7C0851AV-133AXC operate with mismatched clock frequencies on left and right ports?

Yes - the left and right ports are fully asynchronous and support independent clock domains. CLKL and CLKR may run at different frequencies, phases, or even be stopped independently. Internal synchronization logic ensures metastability-free handshaking between ports, provided setup/hold times relative to each port's clock are met per datasheet Table 5.

How does the mailbox interrupt mechanism work between ports?

The upper two memory locations (0x3FFFE for left port mailbox, 0x3FFFF for right port mailbox) trigger INTL/INTR flags. Writing to the opposite port's mailbox asserts that port's interrupt LOW; reading the mailbox resets it HIGH. Both operations occur synchronously to the writing/reading port's clock edge - enabling precise, race-free inter-processor signaling without software polling.

Is MRST required to be held active for a minimum duration after power-up?

Yes - MRST must be held LOW for at least one full cycle of the fastest active clock (CLKL or CLKR), then released HIGH. This ensures complete initialization of both burst counters (to 0x00000), mask registers (to 0xFFFFF), and interrupt flags (to HIGH). Failure to meet this requirement may result in undefined counter behavior or persistent interrupt assertion.