Infineon Technologies CY7C1021BNV33L-12ZXCT

Overview

CY7C1021BNV33L-12ZXCT from Cypress Semiconductor is a 64K × 16-bit (1-Mbit) asynchronous CMOS static RAM operating at 3.3 V with 12 ns access time, low active power (576 mW max), and automatic CE-controlled power-down. It supports independent byte-wide write enable via BHE/BLE pins and is packaged in a Pb-free 44-pin TSOP II for embedded memory buffering in industrial control and communications systems.

For engineers reviewing the CY7C1021BNV33L-12ZXCT datasheet, CY7C1021BNV33L-12ZXCT pinout, CY7C1021BNV33L-12ZXCT application, or CY7C1021BNV33L-12ZXCT equivalent, this page delivers verified timing parameters, byte-select operation details, package-specific pin mapping, and real-world use cases for SRAM integration in space-constrained, low-power designs.

Technical Context

This SRAM implements a full 65,536-word × 16-bit array with separate high-byte (I/O9–I/O16/BHE) and low-byte (I/O1–I/O8/BLE) control, enabling partial writes without read-modify-write cycles. Its TTL/CMOS-compatible inputs accept VIH ≥ 2.2 V and VIL ≤ 0.8 V, and output drive meets VOH ≥ 2.4 V (IOH = –4 mA) and VOL ≤ 0.4 V (IOL = 8 mA).

Timing is defined by tAA = 12 ns (address-to-data), tRC = 12 ns (read cycle), and tWC = 12 ns (write cycle), with tHZOE = 6 ns and tPD = 12 ns for fast power-state transitions. The L-version achieves ISB2 = 0.5 mA standby current under CMOS input conditions and supports data retention down to VCC = 2.0 V.

Key Specifications

Pinout & Package

Package: 44-pin TSOP Type II (0.400-inch width), RoHS-compliant, surface-mount, JEDEC MO-143AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV102416AL-12MLI and MC1021B-12L, the CY7C1021BNV33L-12ZXCT offers superior standby efficiency (0.5 mA vs. 5 mA), RoHS-compliant packaging, and documented Mini BGA migration path-making it optimal for new industrial designs prioritizing longevity and thermal headroom.

Availability

CY7C1021BNV33L-12ZXCT is available at Aetrix Electronics and suitable for industrial PLCs, legacy 16-bit microcontroller systems, and telecom line card packet buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C1021BNV33L-12ZXCT 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 markets, with headquarters in San Jose, CA.

The CY7C1021BNV series was developed specifically for cost-sensitive, space-constrained embedded systems needing fast, low-power, byte-selectable parallel SRAM-targeting applications where EEPROM or Flash latency is unacceptable.

FAQ

Is CY7C1021BNV33L-12ZXCT compatible with 5 V logic interfaces?

No. This device operates strictly at 3.3 V (3.0–3.6 V) and its inputs are not 5 V tolerant. Applying 5 V to any pin-including address, data, or control lines-exceeds the absolute maximum rating of VCC + 0.5 V and risks permanent damage. Level-shifting circuitry is required for interfacing with 5 V microcontrollers or FPGAs.

What is the significance of the "L" suffix in CY7C1021BNV33L-12ZXCT?

The "L" denotes the low-power variant: it specifies reduced active current (150 mA max), ultra-low standby current (0.5 mA max under CMOS input conditions), and guaranteed data retention down to 2.0 V. This distinguishes it from standard-speed or non-L versions that draw significantly higher ISB and lack retention specs.

Can BLE and BHE be asserted simultaneously for full 16-bit operation?

Yes. When both BLE and BHE are LOW while CE and WE are active, the device performs full 16-bit read or write operations across I/O1–I/O16. The truth table confirms this as the "Write - All bits" and "Read - All bits" modes, with no timing penalty versus byte-only access.

Does CY7C1021BNV33L-12ZXCT support hot insertion or live swapping?

No. The device lacks hot-swap protection features such as power-on reset, I/O clamp diodes rated for insertion transients, or controlled slew-rate outputs. Applying VCC or signals before establishing proper grounding may cause latch-up or parametric shift. Board-level hot-swap circuitry must be implemented externally.