Infineon Technologies CY7C1327G-133AXIT

Overview

CY7C1327G-133AXIT from Cypress Semiconductor is a 4-Mbit (256K × 18) pipelined synchronous SRAM with registered I/O, 133-MHz clock operation, 4.0 ns clock-to-output delay, dual power rails (3.3 V core / 2.5 V I/O), and user-selectable linear or interleaved burst mode. It serves as secondary cache memory in high-performance embedded and computing systems requiring deterministic timing and burst data throughput.

For engineers reviewing the CY7C1327G-133AXIT datasheet, CY7C1327G-133AXIT pinout, CY7C1327G-133AXIT application, or CY7C1327G-133AXIT equivalent, key selection criteria include synchronous self-timed write support, ZZ sleep mode behavior, ADSP/ADSC dual address strobe architecture, and TQFP-100 package compatibility with Intel Pentium™-compatible burst sequences.

Technical Context

The device implements a two-bit wraparound burst counter synchronized to CLK's rising edge, enabling internal address generation for 1–4-word bursts. All synchronous inputs-including A[1:0], CE1/CE2/CE3, ADSP/ADSC/ADV, BWA/BWB, BWE, and GW-are registered on the same clock edge, ensuring precise pipeline alignment.

It supports both processor-initiated (ADSP) and controller-initiated (ADSC) access protocols: ADSP-triggered writes require two clocks, while ADSC-triggered writes complete in one clock. Output enable (OE) is asynchronous, and ZZ sleep mode is active-HIGH but requires external grounding per errata (Pin 64).

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25618AL-133TQLI and AS7C3256A-133JCIN, CY7C1327G-133AXIT uniquely delivers dual-voltage I/O, hardware-selectable burst modes, and ADSP/ADSC protocol flexibility-enabling drop-in compatibility with legacy Pentium™-based architectures without voltage translation or timing revalidation.

Availability

CY7C1327G-133AXIT is available at Aetrix Electronics and suitable for industrial control CPUs, network line cards, real-time DSP subsystems, and avionics display modules requiring stable component supply across extended product lifecycles.

Supply support for CY7C1327G-133AXIT 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) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and programmable analog/digital ICs for industrial, automotive, and communications markets.

The CY7C1327G belongs to Cypress's high-speed synchronous SRAM product line, designed specifically for low-latency, burst-capable cache and buffer applications in performance-critical computing and embedded systems.

FAQ

What is the required connection for the ZZ pin on CY7C1327G-133AXIT?

The ZZ pin (Pin 64) must be externally connected to ground per documented errata (Rev. *Q, page 21). Although defined as active-HIGH sleep input, internal design requires this external pull-down to ensure reliable operation and prevent unintended entry into sleep mode during normal use.

How does the MODE pin affect burst addressing behavior?

When MODE is tied to GND, the device executes linear burst sequences (e.g., 0x0000 → 0x0001 → 0x0002); when tied to VDD or left floating, it uses interleaved burst (e.g., 0x0000 → 0x0002 → 0x0001 → 0x0003), matching Intel Pentium™ processor requirements. This is a static configuration set at power-up and cannot be changed dynamically.

Can CY7C1327G-133AXIT operate with only a 3.3 V supply?

No. The device requires two independent supplies: VDD = 3.3 V ± 0.3 V for core logic and VDDQ = 2.5 V ± 0.2 V for I/O drivers. Using 3.3 V on VDDQ violates JEDEC JESD8-5 compliance, risks output driver overstress, and invalidates AC timing specifications including tCO and setup/hold margins.

What is the functional difference between ADSP and ADSC strobes?

ADSP initiates processor-style accesses: address capture occurs on its assertion, but writes require two clocks. ADSC initiates controller-style accesses: address and write data are latched in one clock, enabling single-cycle writes. ADSP takes precedence when both are asserted simultaneously, and ADSP is ignored if CE1 is inactive.