Infineon Technologies CY7C1021BNL-15ZSXAT

Overview

CY7C1021BNL-15ZSXAT 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 write control via BHE/ BLE and operates in 44-pin TSOP II packaging for embedded memory buffering in real-time controllers and legacy bus interfaces.

For engineers reviewing the CY7C1021BNL-15ZSXAT datasheet, CY7C1021BNL-15ZSXAT pinout, CY7C1021BNL-15ZSXAT application, or CY7C1021BNL-15ZSXAT equivalent, key selection criteria include tAA = 15 ns read timing, dual-byte enable architecture, ISB1 ≤ 40 mA standby current under TTL input conditions, and compatibility with 5 V parallel address/data buses in space-constrained industrial systems.

Technical Context

The CY7C1021BNL-15ZSXAT implements a synchronous, non-volatile-equivalent SRAM array organized as 65,536 × 16 bits with fully decoded row/column addressing. Its logic block integrates independent byte-enable decoding for I/O1–I/O8 (BLE) and I/O9–I/O16 (BHE), enabling partial-word writes without external gating.

Timing behavior is defined by strict AC parameters: tAA = 15 ns (address-to-data valid), tDOE = 7 ns (OE-low-to-output-valid), and tHZOE = 7 ns (OE-high-to-high-Z), all specified at VCC = 5 V, TA = –40 °C to +85 °C, and 30 pF load. Power management relies on CE-driven automatic transition between active (ICC ≤ 130 mA) and standby (ISB1 ≤ 40 mA) states.

Key Specifications

Pinout & Package

Package: 44-pin TSOP II (10.16 mm × 20.00 mm, 0.8 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AS6C1008-15TIN and IS61LV102416-15TQLI, CY7C1021BNL-15ZSXAT uniquely delivers 5 V operation, industrial temperature rating, and native 16-bit dual-byte architecture-making it irreplaceable in retrofitting or maintaining legacy 5 V control systems without voltage translation or bus widening.

Availability

CY7C1021BNL-15ZSXAT is available at Aetrix Electronics and suitable for industrial PLCs, motor drive controllers, medical imaging subsystems, and legacy bus-based data acquisition requiring stable component supply across extended product lifecycles.

Supply support for CY7C1021BNL-15ZSXAT 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 mixed-signal ICs for industrial, automotive, and communications infrastructure.

CY7C1021BNL-15ZSXAT belongs to Cypress's legacy parallel SRAM product line, engineered specifically for pin-compatible replacement of aging 5 V memory in long-lifecycle industrial control and instrumentation platforms.

FAQ

Is CY7C1021BNL-15ZSXAT compatible with 3.3 V systems?

No. This device requires a 5 V ±10% supply (4.5 V to 5.5 V) and is not 3.3 V tolerant. Applying 3.3 V to VCC will prevent proper operation, and driving inputs above 3.6 V may damage I/O structures designed for 5 V logic levels. Use only in 5 V bus environments or with level-shifting circuitry.

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

Pins 22, 23, and 28 are No Connect-physically present but unconnected to the silicon die. They must remain unconnected on the PCB; routing traces or applying voltage to these pins risks signal coupling or mechanical stress. Their presence accommodates package standardization across the CY7C1021B family.

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

Automatic power-down activates only when CE is HIGH-regardless of OE, WE, BHE, or BLE state. During partial byte reads/writes (e.g., BLE LOW + BHE HIGH), the device remains fully powered as long as CE is LOW. Power state is controlled exclusively by CE, not byte-enable signals.

Can CY7C1021BNL-15ZSXAT replace CY7C1021DV15ZXI?

No. CY7C1021DV15ZXI is a 3.3 V, 1 Mbit (64 K × 16) SRAM with different DC characteristics, AC timing margins, and thermal resistance (θJA = 62.5 °C/W). Swapping them requires board-level voltage and timing validation; they are not drop-in replacements due to incompatible supply domains and drive strength.