Infineon Technologies CY62137VNLL-70ZSXET

Overview

CY62137VNLL-70ZSXET from Cypress Semiconductor is a 2-Mbit (128K × 16) CMOS static RAM with 55 ns access time, operating across 2.7V–3.6V supply, featuring automatic CE-driven power-down (ISB2 = 1 µA typ.), TTL-compatible I/O, and byte-level write control via BHE/ BLE. It serves as main data buffer in portable telecom systems requiring low-power, fast-access memory.

For engineers reviewing the CY62137VNLL-70ZSXET datasheet, CY62137VNLL-70ZSXET pinout, CY62137VNLL-70ZSXET application, or CY62137VNLL-70ZSXET equivalent, key selection criteria include industrial/automotive temperature grade support, TSOP II package compatibility, MoBL® ultra-low standby current, and dual-byte write enable timing alignment with address/data bus architectures.

Technical Context

The CY62137VNLL-70ZSXET implements a full CMOS 128K × 16 SRAM array with independent high- and low-byte write enables (BHE/BLE), enabling partial-word writes without read-modify-write cycles. Its automatic power-down activates when CE is HIGH or when CE is LOW but both BHE and BLE are HIGH, reducing ICC to ≤1 µA at VCC = 3.6V.

Timing is defined by strict AC parameters including tRC = 70 ns max, tACE = 70 ns max, and tHZOE = 25 ns - all guaranteed over –40°C to +125°C (Automotive-E grade). Input/output pins enter high-impedance state under four conditions: CE HIGH, OE HIGH, BHE/BLE HIGH, or during active write (CE LOW & WE LOW).

Key Specifications

Pinout & Package

Package: 44-pin TSOP Type II (forward), 0.8 mm pitch, JEDEC MO-141AC compliant, Pb-free termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS62WV12816BLL-70NLI and R1LV0216ESG-70SI, CY62137VNLL-70ZSXET uniquely delivers automotive-grade reliability in a pin-compatible TSOP II package with the lowest verified standby current (1 µA), making it optimal for safety-critical, battery-limited embedded systems where thermal robustness and energy efficiency are jointly constrained.

Availability

CY62137VNLL-70ZSXET is available at Aetrix Electronics and suitable for cellular handset design, automotive ADAS modules, industrial PLC data logging, and portable medical monitor development requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY62137VNLL-70ZSXET 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 automotive, industrial, and consumer electronics, with emphasis on low-power innovation and automotive qualification.

The CY62137VN series belongs to Cypress's MoBL® (More Battery Life) SRAM product line, engineered specifically for portable and battery-sensitive applications demanding sub-microamp standby current without sacrificing speed or interface simplicity.

FAQ

What is the maximum clock frequency supported by CY62137VNLL-70ZSXET?

The device does not use a clock signal - it is an asynchronous SRAM. Its maximum operational speed is defined by access time: tRC = 70 ns max implies reliable operation up to 14.3 MHz effective bus bandwidth when interfaced with appropriate address/data setup/hold timing. No internal oscillator or clock input exists.

Does CY62137VNLL-70ZSXET require external refresh circuitry?

No. As a static RAM, CY62137VNLL-70ZSXET retains data indefinitely as long as power is applied and CE remains LOW during active use. Unlike DRAM, it contains no capacitive storage cells and therefore needs no refresh cycles, simplifying controller design and eliminating refresh-related power spikes.

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

Yes. Asserting both BHE and BLE LOW enables concurrent writing to I/O8–I/O15 and I/O0–I/O7, performing a full 16-bit write in one cycle. The truth table confirms this mode is fully supported and electrically identical to separate byte writes - no timing penalty or functional restriction applies.

Is the NC pin (Pin 23) required to be tied to ground or left floating?

Pin 23 is a true no-connect (NC) - internally unconnected to the die. Cypress documentation explicitly states it must be left floating (not grounded or pulled). Connecting it may cause mechanical stress or unintended coupling; leaving it unconnected ensures compliance with JEDEC TSOP II mechanical and electrical specifications.