Infineon Technologies CY7C1021BNV33L-10ZXC

Overview

CY7C1021BNV33L-10ZXC from Cypress Semiconductor is a 64K × 16-bit (1,048,576-bit) asynchronous CMOS static RAM with 3.3 V ±10% supply, 10 ns access time, and TSOP II-44 package. It supports independent byte-wide write control via BHE/ BLE, automatic CE-driven power-down (1.80 mW max standby), and operates across commercial temperature range (0°C to +70°C). Used in legacy industrial controllers for real-time data buffering where deterministic latency and low-power deselected state are critical.

For engineers reviewing the CY7C1021BNV33L-10ZXC datasheet, CY7C1021BNV33L-10ZXC pinout, CY7C1021BNV33L-10ZXC application, or CY7C1021BNV33L-10ZXC equivalent, this page delivers verified timing parameters, validated byte-enable behavior, package-specific thermal and routing constraints, and direct alternatives with documented access time and standby current trade-offs.

Technical Context

This SRAM implements a full asynchronous interface with separate Byte High Enable (BHE) and Byte Low Enable (BLE) inputs enabling true 8-bit sub-word writes without read-modify-write cycles. Its dual-byte architecture allows concurrent access to upper and lower data bytes under independent enable control while sharing address and chip-select logic.

The device uses standard TTL-compatible input thresholds (VIH = 2.2 V, VIL = 0.8 V) and drives outputs to VOH ≥ 2.4 V / VOL ≤ 0.4 V under specified loads. Power management relies on CE-driven automatic power-down, reducing ICC to 500 µA (L version) when CE is deasserted - a feature confirmed in both SOJ and TSOP II variants per datasheet Rev. **.

Key Specifications

Pinout & Package

Package: 44-pin TSOP Type II (10.16 mm × 20.95 mm, 0.8 mm pitch), Pb-free, JEDEC MO-143AC compliant. Pin 1 marked by beveled corner; body thickness 1.0 mm max.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV25616AL-10TLI and AS6C4008-10TIN, the CY7C1021BNV33L-10ZXC offers unique byte-select capability in a drop-in TSOP II-44 footprint with proven 500 µA standby - critical for retrofitting legacy 64K×16 designs without altering control logic or layout.

Availability

CY7C1021BNV33L-10ZXC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy telecom line card caching, and medical imaging frame storage requiring stable component supply across extended product lifecycles.

Supply support for CY7C1021BNV33L-10ZXC 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.

The CY7C1021BNV series targets cost-sensitive, timing-critical embedded systems requiring deterministic asynchronous SRAM performance with minimal external logic - especially in legacy 16-bit bus architectures.

FAQ

What is the maximum clock frequency supported by CY7C1021BNV33L-10ZXC?

This is an asynchronous SRAM and does not use a clock signal. Its operation is controlled solely by CE, OE, WE, BHE, and BLE timing. The 10 ns access time corresponds to a maximum effective bus cycle rate of 100 MHz when interfaced with controllers that meet setup/hold requirements - confirmed by tRC = 10 ns in the datasheet's switching characteristics table.

Does CY7C1021BNV33L-10ZXC support battery backup for data retention?

Yes. The L-version supports data retention at VCC = 2.0 V minimum with ICCDR ≤ 100 µA, enabling direct connection to lithium coin cells or supercapacitors without regulators. This behavior is explicitly characterized in the "Data Retention Characteristics" section (Page 5) and validated across the commercial temperature range.

Can CY7C1021BNV33L-10ZXC be used with 5 V logic interfaces?

No. All inputs require VIH ≥ 2.2 V and VIL ≤ 0.8 V referenced to VCC = 3.3 V, and absolute maximum ratings prohibit applying 5 V signals. Interfacing with 5 V systems requires level-shifting circuitry - confirmed by the "DC Input Voltage" specification (−0.3 V to VCC+0.3 V) and "Maximum Ratings" table limiting input voltage to VCC+0.5 V.

Is the TSOP II-44 package of CY7C1021BNV33L-10ZXC RoHS compliant?

Yes. The "ZXC" suffix denotes Pb-free TSOP II packaging, as stated in the Ordering Information table (Page 8) and confirmed by package diagram 51-85087. Cypress qualified this variant to JEDEC J-STD-020 moisture sensitivity level 3 and RoHS Directive 2011/65/EU prior to discontinuation.