Infineon Technologies CY7C1021BNL-15ZXC

Overview

CY7C1021BNL-15ZXC from Cypress Semiconductor is a 1-Mbit (64K × 16) high-speed CMOS static RAM with 15 ns maximum access time, industrial temperature range (–40°C to +85°C), 5 V ±10% supply, and automatic CE-controlled power-down. It supports independent byte write via BHE/ BLE control and is packaged in Pb-free 44-pin TSOP II for embedded memory buffering in legacy industrial controllers.

For engineers reviewing the CY7C1021BNL-15ZXC datasheet, CY7C1021BNL-15ZXC pinout, CY7C1021BNL-15ZXC application, or CY7C1021BNL-15ZXC equivalent, key selection criteria include tAA = 15 ns timing compliance, dual-byte write capability, ISB2 standby current ≤10 mA at CMOS inputs, and TSOP II mechanical compatibility with legacy PCB footprints.

Technical Context

This SRAM implements a synchronous, non-volatile-independent 64K × 16-bit array with full address decoding (A0–A15), bidirectional I/O1–I/O16, and TTL/CMOS-compatible control logic. Read/write operations are governed by active-low CE, OE, WE, BHE, and BLE signals, enabling selective upper- or lower-byte access without external gating.

The device uses automatic CE-driven power-down mode (ISB2 ≤10 mA) when deselected, and features tri-state I/O drivers with tHZOE/tHZCE ≤7 ns and tLZOE/tLZCE ≤0 ns, ensuring clean bus release during mode transitions. All timing parameters are specified at VCC = 5.0 V, TA = –40°C to +85°C, and CL = 30 pF.

Key Specifications

Pinout & Package

Package: 44-pin TSOP Type II (Pb-free), 400-mil width, JEDEC MO-143AC compliant. Body dimensions: 11.20 mm × 10.16 mm × 1.20 mm; lead pitch: 0.8 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61LV1024-15K, CY7C1021BNL-15ZXC maintains native 5 V compatibility and TSOP II footprint; compared with CY7C1021DN-15ZXC, it trades higher ISB2 (10 mA vs. 0.5 mA) for guaranteed backward compatibility with older controller timing margins and qualification history.

Availability

CY7C1021BNL-15ZXC is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller memory expansion, automotive instrument clusters, and test equipment requiring stable component supply with long-lifecycle support.

Supply support for CY7C1021BNL-15ZXC 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, microcontrollers, and programmable logic solutions for industrial and automotive markets.

CY7C1021BNL-15ZXC belongs to the CY7C1021x family of high-speed parallel SRAMs designed specifically for legacy system upgrades and long-lifecycle industrial applications requiring proven reliability and pin-for-pin compatibility.

FAQ

Is CY7C1021BNL-15ZXC functionally identical to CY7C1021BN-15ZXC?

Yes - both share identical electrical specifications, timing (tAA = 15 ns), pinout, and TSOP II package. The "L" suffix denotes Pb-free compliance per RoHS Directive 2011/65/EU, confirmed in Cypress ordering documentation (e.g., CY7C1021BNL-15ZXC vs. CY7C1021BN-15ZXC in Table on Page 8). No functional or timing differences exist between the two.

Can CY7C1021BNL-15ZXC operate at 3.3 V?

No - this device is strictly rated for 5 V ±10% (4.5 V to 5.5 V) operation per Absolute Maximum Ratings and Operating Range tables. Attempting 3.3 V operation results in undefined timing, increased ICC, and potential data corruption due to insufficient noise margin on TTL-compatible inputs (VIH min = 2.2 V, but VCC < 4.5 V violates DC specs).

What is the maximum clock frequency supported for continuous read cycles?

The maximum sustained read frequency is 66.7 MHz, derived from tRC = 15 ns minimum read cycle time. This assumes CE and OE held active, address stable before tAA, and load capacitance ≤30 pF. At 66.7 MHz, the device delivers 133.4 MB/s peak bandwidth (16 bits × 66.7 MHz), validated in Cypress AC switching tests (Page 4–5).

Does CY7C1021BNL-15ZXC require external pull-up resistors on BHE, BLE, or OE?

No - all control inputs (BHE, BLE, OE, CE, WE) are CMOS/TTL compatible with defined VIH (≥2.2 V) and VIL (≤0.8 V) thresholds. Pull-ups are unnecessary unless bus sharing or open-drain arbitration is implemented externally; Cypress application notes confirm direct MCU GPIO connection without termination.