Infineon Technologies CY7C1347F-100AC

Overview

CY7C1347F-100AC from Cypress Semiconductor is a 4-Mb (128K × 36) pipelined synchronous SRAM optimized for zero-wait-state secondary cache in high-performance computing systems. It features 3.3V core supply, 2.5V/3.3V I/O operation, synchronous self-timed writes, user-selectable Intel Pentium® interleaved or linear burst sequences via MODE pin, and 4.5 ns clock-to-output delay at 100 MHz.

For engineers reviewing the CY7C1347F-100AC datasheet, CY7C1347F-100AC pinout, CY7C1347F-100AC application, or CY7C1347F-100AC equivalent, key selection criteria include burst mode flexibility, dual-voltage I/O compatibility, synchronous chip select architecture (CE1/CE2/CE3), asynchronous OE masking behavior during deselected-to-selected transitions, and ZZ sleep mode timing requirements.

Technical Context

The CY7C1347F-100AC implements fully registered synchronous interfaces: all inputs (address, control, data) are latched on the rising edge of CLK, and all outputs pass through output registers synchronized to CLK. Its 2-bit wraparound burst counter captures A[1:0] at ADSP/ADSC assertion and auto-increments on ADV assertion.

Burst sequencing is statically configured by MODE: tied to GND for linear (e.g., PowerPC®), floating or VDDQ for interleaved (Intel Pentium®). Write operations support both ADSP-initiated (two-cycle) and ADSC-initiated (single-cycle) modes, with GW overriding BW[A:D]/BWE for full-word writes and synchronous self-timed write circuitry eliminating external write pulse generation.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV12836AL-100TQLI and AS7C312836B-100BIN, the CY7C1347F-100AC uniquely combines Intel Pentium®-compatible interleaved burst selection, dual-voltage I/O tolerance, and asynchronous ZZ sleep - making it optimal for legacy x86 cache designs requiring power-aware operation.

Availability

CY7C1347F-100AC is available at Aetrix Electronics and suitable for high-speed processor cache interfaces, multi-processor shared memory subsystems, and industrial motion controller memory requiring stable component supply across extended temperature ranges.

Supply support for CY7C1347F-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 fabless semiconductor company specializing in high-performance memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

The CY7C1347F belongs to Cypress's high-speed synchronous SRAM product line, designed specifically to replace asynchronous SRAMs in zero-wait-state cache and buffer applications where deterministic timing and burst efficiency are critical.

FAQ

What is the function of the MODE pin on CY7C1347F-100AC?

The MODE pin selects the burst sequence type: tied to GND enables linear burst order (e.g., PowerPC®), while floating or connected to VDDQ enables Intel Pentium®-compatible interleaved burst. It is a static strap pin-must remain stable during operation and is sampled only at power-up or reset. Internal pull-up ensures default interleaved mode if left unconnected.

How does the asynchronous OE masking behavior affect system timing?

When CY7C1347F-100AC transitions from deselected to selected state, OE is internally masked during the first clock cycle of the read access-forcing outputs into high-impedance regardless of OE state. This prevents bus contention during bank switching. After the first cycle, OE regains control. Designers must account for this one-cycle delay in timing budgets for systems with frequent chip select toggling.

Can CY7C1347F-100AC operate with VDDQ = 2.5V while maintaining 3.3V signal integrity on other pins?

Yes. When VDDQ = 2.5V, all DQ/DQP pins are 3.3V tolerant, allowing connection to 3.3V logic without level shifters. Core logic (VDD = 3.3V) remains unaffected. This dual-rail design permits direct interfacing with 2.5V I/O domains while preserving compatibility with 3.3V system buses and voltage references.

What is the timing relationship between ZZ assertion and data retention?

Data integrity is preserved throughout ZZ sleep mode. Two clock cycles are required to enter or exit sleep-during entry, internal clocks halt after the second CLK edge; during exit, full functionality resumes after the second CLK edge. No external refresh or backup power is needed, and all stored data remains valid across the entire industrial temperature range (-40°C to +85°C).