Infineon Technologies CY7C1021BN-15ZSXE

Overview

CY7C1021BN-15ZSXE from Cypress Semiconductor is a 1-Mbit (64 K × 16) high-speed CMOS static RAM with 15 ns access time, industrial temperature range (–40 °C to +85 °C), 5 V ±10% supply, and automatic CE-controlled power-down mode. It supports independent byte-wide writes via BHE/ BLE and operates in 44-pin TSOP II packaging for space-constrained embedded memory applications.

For engineers reviewing the CY7C1021BN-15ZSXE datasheet, CY7C1021BN-15ZSXE pinout, CY7C1021BN-15ZSXE application, or CY7C1021BN-15ZSXE equivalent, key selection criteria include tAA = 15 ns read timing, ISB2 ≤ 10 mA standby current (CMOS inputs), dual-byte enable control, and automotive-grade thermal robustness up to 85 °C ambient.

Technical Context

The CY7C1021BN-15ZSXE implements a synchronous, non-volatile-independent SRAM array organized as 65,536 × 16 bits with full address decoding (A0–A15) and bidirectional I/O1–I/O16 data bus. Its control logic uses active-low CE, WE, OE, BHE, and BLE signals to manage read/write direction, byte masking, and output tristating without external latches.

Power management relies on automatic CE-driven transition into low-power ISB2 mode (≤10 mA) when CE is HIGH and all inputs are at valid logic levels. The device maintains data integrity during power transitions via guaranteed tPD = 15 ns power-down delay and tPU = 0 ns power-up recovery, enabling seamless integration into real-time control buffers and boot memory subsystems.

Key Specifications

Pinout & Package

44-pin TSOP II (Type II) package with 0.8 mm pitch, 400-mil body width, and standard JEDEC MO-141AC footprint. Pin 1 marked by beveled corner; top-side marking includes "CY7C1021BN-15ZSXE" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS6C1008-15TIN and IS61LV1024-15K, CY7C1021BN-15ZSXE uniquely delivers 5 V compatibility, true 16-bit bus width, and industrial-temperature-rated TSOP II packaging-enabling drop-in replacement in legacy 5 V control systems without redesign.

Availability

CY7C1021BN-15ZSXE is available at Aetrix Electronics and suitable for industrial PLC data buffering, automotive ECU boot memory, and medical imaging frame storage requiring stable component supply across extended product lifecycles.

Supply support for CY7C1021BN-15ZSXE 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-reliability memory and programmable solutions for industrial, automotive, and communications infrastructure markets.

The CY7C1021BN series targets cost-sensitive, high-speed SRAM applications demanding deterministic timing, low-power standby, and industrial-grade thermal performance in compact surface-mount packages.

FAQ

Is CY7C1021BN-15ZSXE compatible with 3.3 V logic interfaces?

No. CY7C1021BN-15ZSXE requires 5 V ±10% supply and specifies VIH = 2.2 V minimum and VIL = 0.8 V maximum. Direct connection to 3.3 V logic drivers violates input voltage limits and risks unreliable operation or damage. Level-shifting circuitry is mandatory for mixed-voltage systems.

What is the function of NC pins 22, 23, and 28?

Pins 22, 23, and 28 are No Connect terminals-physically present but not bonded to the silicon die. They must remain unconnected in PCB layout; routing traces or applying voltage to these pins may cause mechanical stress or unintended coupling. Their presence accommodates package mold design and thermal relief.

How does automatic power-down behave during partial byte writes?

Automatic power-down activates only when CE is HIGH and all control inputs (WE, OE, BHE, BLE) are at valid logic levels (VIH or VIL). During partial byte writes (e.g., BLE LOW, BHE HIGH), CE remains LOW so power-down is disabled-ensuring full active current is available for the ongoing write operation.

Can CY7C1021BN-15ZSXE replace CY7C1021DV-15ZSXI in existing designs?

Yes, with verification of temperature grade. CY7C1021BN-15ZSXE (industrial –40 °C to +85 °C) supersedes CY7C1021DV-15ZSXI (commercial 0 °C to +70 °C) in pinout, timing, and DC specs. The BN version offers extended temperature range and identical TSOP II footprint, making it a direct upgrade for field-deployed systems requiring broader thermal tolerance.