Infineon Technologies CY7C1351F-100AC

Overview

CY7C1351F-100AC from Cypress Semiconductor is a 4-Mb (128K × 36) synchronous flow-through SRAM with NoBL™ architecture, designed for zero-wait-state back-to-back read/write operations in high-speed memory subsystems. It operates at 100 MHz with 8.0 ns clock-to-output delay, supports byte write via BW[A:D], and uses 3.3V I/O with 2.5V/3.3V flexible VDDQ. It is deployed in network packet buffers and cache controllers requiring deterministic latency.

For engineers reviewing the CY7C1351F-100AC datasheet, CY7C1351F-100AC pinout, CY7C1351F-100AC application, or CY7C1351F-100AC equivalent, key selection criteria include burst order control (MODE pin), synchronous self-timed write timing, CEN-gated clock qualification, and TQFP-100 package compatibility with ZBT™-class systems.

Technical Context

The CY7C1351F-100AC implements a synchronous flow-through pipeline where all inputs-including address, WE, BW[A:D], ADV/LD, and CE signals-are registered on the rising edge of CLK, qualified by active-low CEN. Its NoBL™ logic eliminates bus latency by enabling consecutive read/write cycles without wait states.

Burst operation is controlled by a 2-bit internal counter driven by A[1:0] and ADV/LD, with linear or interleaved sequence selected by the MODE strap pin. Output drivers are synchronously three-stated during write data capture, independent of OE, ensuring clean bus handoff between read and write phases.

Key Specifications

Pinout & Package

Package: 100-lead Thin Quad Flat Package (TQFP), RoHS-compliant, body size 14 mm × 20 mm, lead pitch 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2115L10PF and IS61WV12836B, the CY7C1351F-100AC uniquely combines NoBL™ zero-latency pipelining, hardware-configurable burst order, and integrated self-timed writes - making it optimal for FPGA-based systems needing minimal glue logic and guaranteed 8.0 ns read access.

Availability

CY7C1351F-100AC is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, and high-speed cache controller designs requiring stable component supply, long-term lifecycle support, and JEDEC-standard TQFP packaging.

Supply support for CY7C1351F-100AC 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 U.S.-based semiconductor company specializing in high-performance memory, microcontrollers, and programmable logic solutions for industrial and communications infrastructure.

The CY7C1351F belongs to Cypress's NoBL™ SRAM product line, engineered specifically to replace ZBT™ devices in systems demanding deterministic, wait-state-free memory access with simplified timing closure.

FAQ

What is the function of the MODE pin on CY7C1351F-100AC?

The MODE pin selects burst address sequence: tied to GND for linear burst (00→01→10→11), or to VDD/floating for interleaved burst (00→01→10→11 → 01→00→11→10). It is a static strap pin-no register writes needed-and directly configures the internal 2-bit burst counter behavior without software overhead.

How does the CY7C1351F-100AC handle bus contention during write operations?

During the data portion of any write cycle, DQ and DQP lines are synchronously forced into high-impedance regardless of OE state. This hardware-enforced three-state action prevents bus contention even if OE remains active, ensuring safe bidirectional I/O sharing without external bus transceivers or timing-critical OE coordination.

Can CY7C1351F-100AC operate with 2.5V I/O voltage?

Yes-VDDQ supports 2.5V ±0.2V or 3.3V ±0.3V operation, allowing direct interfacing with 2.5V FPGAs or ASICs. Core VDD remains fixed at 3.3V. The device meets AC/DC specifications across both VDDQ ranges, and no configuration register changes are required when switching VDDQ voltage.

What happens when CEN is deasserted during an active memory access?

Deasserting CEN (driving HIGH) masks the CLK signal and freezes all internal registers and state machines without deselecting the device. The previous clock cycle is extended indefinitely, preserving address, control, and data register contents until CEN is reasserted-enabling precise pause/resume control for debug or power management without losing context.