62W16258B

Technical Summary: Hitachi HM62W16258BI Series 4-Mbit Static RAM

Overview

The Hitachi HM62W16258BI Series is a high-performance 4-Mbit static RAM (SRAM) organized as 262,144 words × 16 bits. Manufactured using advanced Hi-CMOS process technology, this SRAM offers a combination of high density, fast access times, and low power consumption. Designed for applications requiring reliable and efficient memory solutions, the HM62W16258BI is particularly well-suited for battery backup systems due to its ultra-low standby power dissipation. The device operates on a single 3.3 V power supply and is available in a standard 44-pin plastic TSOPII package.

Features

• Single 3.3 V Supply: Operates at 3.3 V ± 0.3 V, making it compatible with modern low-voltage systems.
• Fast Access Time: Maximum access time of 70 ns ensures quick data retrieval.
• Low Power Consumption:
  • Active mode power dissipation: 9.9 mW (typical).
  • Standby mode power dissipation: 3.3 µW (typical), ideal for battery-operated applications.
• Completely Static Memory: No clock or timing strobe required, simplifying system design.
• Equal Access and Cycle Times: Ensures consistent performance for read and write operations.
• Common Data Input and Output: Three-state output for easy interfacing with microprocessors and other digital systems.
• Battery Backup Operation: Supports seamless transition to backup power, ensuring data retention during power loss.
• Wide Temperature Range: Operates reliably from –40°C to 85°C, suitable for industrial and automotive applications.

Applications

The HM62W16258BI Series is designed for a wide range of applications where high-speed, low-power, and reliable memory solutions are required. Key application areas include:

• Battery Backup Systems: Due to its ultra-low standby power consumption, this SRAM is ideal for portable and battery-powered devices.
• Industrial Control Systems: Its wide temperature range and robust performance make it suitable for harsh industrial environments.
• Automotive Electronics: Reliable operation under extreme temperatures ensures compatibility with automotive applications.
• Networking Equipment: Fast access times and low power dissipation are beneficial for routers, switches, and other networking hardware.
• Medical Devices: The SRAM's reliability and low power consumption make it suitable for critical medical equipment.
• Consumer Electronics: Used in devices such as digital cameras, gaming consoles, and smart appliances.

Electrical Characteristics

The following table summarizes the key electrical characteristics of the HM62W16258BI Series:

• Supply Voltage (V_CC): 3.3 V ± 0.3 V
• Operating Current (I_CC):
  • Active mode: 3 mA (typical) at 70 ns access time.
  • Standby mode: 1 µA (typical) with CMOS level inputs.
• Input/Output Voltage Levels:
  • High-level input voltage (V_IH): 2.0 V (min) to V_CC + 0.3 V (max).
  • Low-level input voltage (V_IL): –0.3 V (min) to 0.8 V (max).
• Output Drive Capability:
  • High-level output current (I_OH): –4.0 mA (min).
  • Low-level output current (I_OL): 8.0 mA (min).
• Data Retention Voltage: 2.0 V (min) for battery backup operation.
• Power Dissipation:
  • Active mode: 9.9 mW (typical).
  • Standby mode: 3.3 µW (typical).

Package Information

The HM62W16258BI Series is available in a 44-pin plastic Thin Small Outline Package (TSOPII). The package dimensions and pin configuration are as follows:

• Package Type: 44-pin TSOPII (Type II).
• Package Dimensions:
  • Width: 10.16 mm (max).
  • Length: 18.41 mm (max).
  • Height: 1.2 mm (max).
• Pin Pitch: 0.8 mm.
• Lead Count: 44.
• Pin Configuration: The pinout includes address inputs (A0–A17), data inputs/outputs (DQ0–DQ15), chip enable (CE), output enable (OE), write enable (WE), and power supply pins (V_CC, GND).

Ordering Information

The HM62W16258BI Series is available in multiple variants to suit different application requirements. The ordering information is as follows:

• HM62W16258BI-70: 70 ns access time, 44-pin TSOPII package.
• HM62W16258BI-85: 85 ns access time, 44-pin TSOPII package.

For detailed ordering and part number information, refer to the manufacturer's datasheet or contact authorized distributors.

Conclusion

The Hitachi HM62W16258BI Series 4-Mbit SRAM is a high-performance, low-power memory solution designed for a wide range of applications. With its fast access times, low power consumption, and robust packaging, it is an excellent choice for systems requiring reliable and efficient static RAM. Whether used in industrial, automotive, or consumer electronics, this SRAM delivers consistent performance and durability.