Infineon Technologies CY7C13451G-100BZXE

Overview

CY7C13451G-100BZXE from Cypress Semiconductor is a 4-Mbit (128K × 36) flow-through synchronous SRAM with 3.3 V core supply, 2.5/3.3 V I/O supply, and 8.0 ns clock-to-output delay at 100 MHz. It features synchronous burst addressing (linear or interleaved), separate ADSP/ADSC strobes, and ZZ sleep mode. Designed for secondary cache in high-speed microprocessor systems requiring deterministic timing and low-latency data access.

For engineers reviewing the CY7C13451G-100BZXE datasheet, CY7C13451G-100BZXE pinout, CY7C13451G-100BZXE application, or CY7C13451G-100BZXE equivalent, key selection criteria include burst sequence control via MODE pin, synchronous self-timed write architecture, JEDEC JESD8-5 I/O compatibility, and FBGA-165 package integration in space-constrained cache subsystems.

Technical Context

The device implements a 2-bit on-chip wrap-around burst counter fed by A[1:0], enabling automatic address increment during burst reads/writes. Burst order-linear or interleaved-is statically selected by the MODE pin (LOW = linear, HIGH = interleaved), supporting Pentium/i486™-compatible systems.

All synchronous inputs (address, CE1/CE2/CE3, ADSP/ADSC, ADV, BWx, BWE, GW, CLK) are registered on the rising edge of CLK. Asynchronous OE and ZZ inputs bypass clock registration: OE controls output tristate independently of clock phase, while ZZ enables non-time-critical sleep with data retention when driven HIGH (though errata requires external grounding of Ball H11).

Key Specifications

Pinout & Package

Package: 165-ball Fine-Pitch Ball Grid Array (FBGA), RoHS-compliant, 13 mm × 15 mm footprint, 1.0 mm ball pitch, bottom-side thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV12836BLL-10BLI and MT55LCS25636A-100:J, the CY7C13451G-100BZXE uniquely supports both Pentium interleaved and linear bursts via MODE pin, retains data in ZZ sleep, and provides dedicated ADSP/ADSC strobes-making it irreplaceable in legacy x86 cache designs requiring hardware-level burst compatibility.

Availability

CY7C13451G-100BZXE is available at Aetrix Electronics and suitable for Intel Pentium-based cache subsystems, embedded RISC processor caches, and network packet buffering applications requiring stable component supply and long-term obsolescence management.

Supply support for CY7C13451G-100BZXE 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 memory, PSoC, USB, and programmable solutions for industrial, automotive, and consumer electronics.

The CY7C13451G belongs to Cypress's high-performance synchronous SRAM product line, engineered specifically for secondary cache applications in x86 and RISC microprocessor systems demanding sub-10 ns access and deterministic burst behavior.

FAQ

What is the function of the MODE pin, and how must it be configured?

The MODE pin selects burst sequence type: tied to GND for linear burst (sequential addresses), or to VDD/floating for interleaved burst (Pentium-compatible pattern). It is a static strap pin-must remain stable during operation and cannot be toggled dynamically. Internal pull-up ensures default interleaved behavior if left unconnected.

Why does the datasheet require external grounding of the ZZ pin despite its "active-HIGH" specification?

An erratum (Document #001-88572 Rev. *G, page 21) mandates external grounding of Ball H11 (ZZ pin) because the internal pull-down is insufficient to prevent spurious wake-up or metastability. Leaving ZZ floating or driving it HIGH risks unintended exit from sleep mode or functional instability-grounding ensures reliable low-power operation.

How does the CY7C13451G handle simultaneous ADSP and ADSC assertion?

When both ADSP and ADSC are asserted LOW, the device prioritizes ADSP and ignores ADSC. This hierarchy ensures deterministic address capture in systems where both processor and controller may attempt access-eliminating race conditions without external arbitration logic.

Can the CY7C13451G operate with mixed VDD (3.3 V) and VDDQ (2.5 V) supplies in the same system?

Yes-VDD must be 3.3 V ±0.3 V for core logic, while VDDQ can be independently set to either 2.5 V or 3.3 V to match the I/O voltage of the connected controller. This dual-supply architecture enables interoperability with legacy 2.5 V processors and modern 3.3 V FPGAs without level shifters.