Infineon Technologies CY62128ELL-45ZXA

Overview and Specifications of CY62128ELL-45ZXA SRAM by Infineon Technologies

The CY62128ELL-45ZXA from Infineon Technologies is a 1-Mbit (128K × 8) asynchronous static RAM (SRAM) optimized for applications demanding a balance of high performance and ultra-low power consumption. Based on advanced 90 nm CMOS process technology, this SRAM is well-suited for industrial, automotive, and battery-powered embedded systems. The CY62128ELL-45ZXA is available in a 32-pin TSOP I package, along with STSOP and SOIC variants, offering robust mechanical compatibility with various board designs.

Main Attributes and Core Functions of CY62128ELL-45ZXA

Designed as part of the MoBL® (More Battery Life) SRAM family, the CY62128ELL-45ZXA stands out due to its ultra-low standby current (typ. 1 μA, max. 4 μA in industrial applications) and low active operating current (typ. 1.3 mA at 1 MHz), making it ideal for systems where energy efficiency is critical. It achieves a fast access time of 45 ns, enabling real-time data handling for demanding tasks.

Its operating voltage spans 4.5 V to 5.5 V, ensuring compatibility with a wide range of legacy and modern systems. The device supports ambient temperatures from -40 °C to +85 °C for industrial and automotive-A grades, with automotive-E grade extending up to +125 °C for harsh environments. The SRAM is also pin-compatible with the widely used CY62128B series, simplifying migration and drop-in upgrades.

Functional features include automatic power-down when the device is deselected, and straightforward memory expansion capabilities via dedicated chip enable pins (CE1, CE2), output enable (OE), and write enable (WE) signals. The SRAM’s eight input/output pins (I/O0 through I/O7) go into high impedance when deselected or during write operations, supporting clean bus sharing.

Electrical Specifications and Operating Requirements for CY62128ELL-45ZXA

The CY62128ELL-45ZXA operates reliably within a supply voltage range of 4.5 V to 5.5 V. Maximum stability is guaranteed when storage conditions are maintained between -65 °C and +150 °C, and operation with power applied is supported up to +125 °C. The device can tolerate transient voltages as high as VCC + 0.5 V on DC I/O pins for short periods, and withstands static discharge above 2001 V (MIL-STD-883, Method 3015), as well as latch-up currents beyond 200 mA.

For digital logic interfacing, the CY62128ELL-45ZXA is tailored to systems using TTL-level logic. It is not suitable for direct connection to processors that require true CMOS-level thresholds. Engineers must reference the detailed voltage input (VIH, VIL) and output (VOH, VOL) parameters to ensure robust system-level integration. Application Note AN6081 provides guidance for compatibility and workaround solutions with systems requiring higher VIH levels.

Pinout Details and Available Packaging Types of CY62128ELL-45ZXA

Physical connection flexibility is vital for system designers, and the CY62128ELL-45ZXA addresses this need with three industry-standard packages: 32-pin STSOP (ZA), 32-pin SOIC (S), and 32-pin TSOP I (Z). All packages offer identical logic functions and pinouts, facilitating multi-platform adoption.

The pinout supports direct mapping for 128K × 8 organization, with address pins (A0-A16), data I/O pins (I/O0-I/O7), power (VCC, GND), and core control signals (CE1, CE2, OE, WE). Unused NC (no connect) pins ensure flexibility and reduce signal integrity challenges when laying out complex PCBs.

Memory Functionality and Interface Design of CY62128ELL-45ZXA

The CY62128ELL-45ZXA operates as a traditional asynchronous SRAM. Write operations are initiated when CE1 is LOW, CE2 is HIGH, and WE is LOW; the data on I/O0-I/O7 is then latched to the memory location specified by the address pins A0-A16. For read operations, CE1 must be LOW, CE2 HIGH, OE LOW, and WE HIGH. In this condition, the content from the addressed location is output on the I/O pins.

Key design logic includes automatic power-down when the chip is not selected (CE1 HIGH or CE2 LOW), minimizing standby power. The output drivers enter a high-impedance state during standby, output disable (OE HIGH), or when write cycles are active, thereby supporting clean bus multiplexing and memory expansion architectures.

Performance Metrics Access Time, Power Efficiency, and Data Storage Stability of CY62128ELL-45ZXA

Best-in-class speed and power characteristics are central to the CY62128ELL-45ZXA’s value proposition:

Access time: 45 ns (hot, cold, or room temperature), supporting high-speed memory requirements for main memory or cache-like roles.

Standby current: As low as 1 μA (typical), enabling extended battery operation in portable designs.

Active current: 1.3 mA at 1 MHz typical, preserving energy on data-rich applications.

Data retention: The SRAM maintains stored data in standby mode with minimal VCC above retention thresholds, ensuring reliable memory state preservation even in sleep cycles.

These features allow precise tailoring to demanding applications such as industrial IoT modules, automotive control units, and power-sensitive handheld instruments.

Heat Dissipation and Physical Properties of CY62128ELL-45ZXA

Robust mechanical and thermal properties underpin practical deployment in field environments. The CY62128ELL-45ZXA offers a broad junction temperature capability: -40 °C to +85 °C (industrial/automotive-A), up to +125 °C (automotive-E). Standard plastic encapsulation (TSOP I, STSOP, SOIC) provides mechanical protection while maintaining low thermal resistance, thus ensuring reliable operation in dense PCBs or environments with variable ambient conditions.

Capacitance and package parasitics are minimized for signal fidelity, with standard layouts facilitating automated assembly and inspection during volume production.

Alternative Models and Substitute Options for CY62128ELL-45ZXA

For designs requiring alternative sources or enhanced features, the following models could serve as potential equivalents or replacements:

Infineon Technologies CY62128B family: Offers close pin and functional compatibility, suitable for drop-in replacement in many cases when power or speed requirements allow.

Other 1-Mbit (128K × 8) asynchronous SRAMs with matching voltage, package, and timing characteristics can be evaluated based on system compatibility—engineers should cross-verify electrical and timing parameters, especially regarding input logic thresholds.

When CMOS-level input requirements are necessary, select devices designed expressly for full CMOS interfacing, as CY62128ELL-45ZXA is not directly compatible with all CMOS processors—see Infineon's product selector for details and suggested alternatives.

Conclusion

: Selection guidelines for CY62128ELL-45ZXA

Selecting the Infineon Technologies CY62128ELL-45ZXA is well justified for new designs or during legacy upgrades where ultra-low power consumption, fast access time, and robust operating conditions are key priorities. Its flexibility in packaging, extensive temperature range, and established compatibility profile provide confidence for product selection and deployment in sectors ranging from portable electronics to industrial automation and automotive platforms.

Careful attention to electrical interfacing, especially logic level matching, will ensure optimal performance and system reliability. Where direct fit isn’t possible, related Infineon SRAM families and other industry-standard equivalents can be considered, with due diligence on their compatibility envelope. The CY62128ELL-45ZXA, with its proven feature set and reliability, stands as a compelling solution for engineering teams focused on efficient, high-performance SRAM design-in.