Infineon Technologies CY7C1021BN-15VXC

Overview

CY7C1021BN-15VXC from Cypress Semiconductor is a 1-Mbit (64K × 16) high-speed CMOS static RAM with 15 ns maximum access time, 5 V supply, and automatic CE-controlled power-down. It supports independent byte write via BHE/ BLE control, operates across commercial temperature range (0°C to +70°C), and is packaged in Pb-free 44-pin SOJ. Used in legacy industrial controllers for nonvolatile data buffering during processor handshaking.

For engineers reviewing the CY7C1021BN-15VXC datasheet, CY7C1021BN-15VXC pinout, CY7C1021BN-15VXC application, or CY7C1021BN-15VXC equivalent, key selection criteria include tAA ≤ 15 ns, ISB2 ≤ 10 mA standby current, byte-select capability, SOJ package compatibility, and 5 V single-supply operation in space-constrained embedded systems.

Technical Context

This SRAM implements a synchronous, address-decoded 65,536 × 16-bit memory array with dual-byte write enable logic (BHE/BLE active-Low), TTL/CMOS-compatible inputs, and three-state bidirectional I/Os (I/O1–I/O16). Read/write cycles are controlled by CE, OE, and WE with defined setup/hold timing relative to address and control edges.

Power management relies on automatic CE-driven power-down: when CE is HIGH, ICC drops to ISB2 = 10 mA (max) at VCC = 5 V, with no external control required. The device uses standard CMOS process technology and supports both SOJ and TSOP-II footprints without functional differentiation between packages.

Key Specifications

Pinout & Package

Package: 44-pin 400-mil-wide molded SOJ (Small Outline J-lead), Pb-free, JEDEC MS-024AC compliant. Body width 0.400 inch ±0.010 inch; lead pitch 0.050 inch; lead coplanarity ≤0.004 inch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV1024-15KLI and AS6C1008-15PCN, CY7C1021BN-15VXC uniquely delivers 5 V compatibility, integrated byte write control, and zero-overhead power-down-making it irreplaceable in legacy 16-bit bus designs requiring minimal external logic.

Availability

CY7C1021BN-15VXC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy microcontroller memory expansion, automotive instrument cluster display caching, and medical diagnostic equipment bootloader storage requiring stable component supply across multi-year production cycles.

Supply support for CY7C1021BN-15VXC 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 memory, PSoC, USB, and timing solutions for industrial, automotive, and consumer electronics.

CY7C1021BN belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin-compatible replacement of aging 2K×8 and 8K×8 SRAMs in 5 V embedded systems requiring predictable timing and robust bus interfacing.

FAQ

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

No. This device requires a 5 V ±10% supply and features TTL/CMOS input thresholds referenced to 5 V (VIH ≥ 2.2 V, VIL ≤ 0.8 V). Direct connection to 3.3 V logic may cause unreliable operation or excessive input leakage. Level-shifting circuitry is mandatory for mixed-voltage systems.

Does CY7C1021BN-15VXC support asynchronous burst reads?

No. It is a static RAM with purely asynchronous timing-each read or write cycle requires explicit assertion of CE, OE (for reads), and WE (for writes). There is no internal address counter, burst mode, or clock input; all operations are controlled by edge-sensitive control signals.

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

These pins are physically present but electrically unconnected to the silicon die. They must be left floating or tied to ground per Cypress layout recommendations (Document #001-06494, Page 3). Connecting them to VCC or driving them may cause mechanical stress or unintended coupling in high-frequency layouts.

Can CY7C1021BN-15VXC replace CY7C1021BN-12VC in an existing design?

Yes, with timing impact: the -15VXC has 15 ns access time versus 12 ns for the -12VC, increasing worst-case read latency by 3 ns. System timing margins must be re-verified, especially in tightly constrained 66 MHz bus environments. All other electrical and pinout characteristics are identical.