Hitachi HM62W8512B 4-Mbit Static RAM

Overview

The Hitachi HM62W8512B is a high-performance 4-Mbit static RAM (SRAM) organized as 512-kword × 8-bit. Manufactured using advanced 0.35 µm Hi-CMOS process technology, this SRAM delivers higher density, improved performance, and reduced power consumption. The device is designed for applications requiring reliable, high-speed memory with low power consumption, making it particularly suitable for battery backup systems.

Available in either a 525-mil SOP (Small Outline Package) or a 400-mil TSOP TYPE II (Thin Small Outline Package), the HM62W8512B supports high-density mounting, making it ideal for space-constrained applications. Its compatibility with LV-TTL (Low Voltage Transistor-Transistor Logic) levels ensures seamless integration with modern digital systems.

Features

• Single 3.3 V Supply: Operates at 3.3 V ± 0.3 V, making it suitable for low-voltage applications.
• High-Speed Access Time: Maximum access times of 55 ns and 70 ns ensure fast data retrieval.
• Low Power Consumption:
  • Active mode: 16.5 mW/MHz (typical)
  • Standby mode: 3.3 µW (typical), ideal for battery-operated systems.
• Completely Static Memory: No clock or timing strobe required, simplifying design and integration.
• Equal Access and Cycle Times: Ensures consistent performance for read and write operations.
• Three-State Output: Common data input and output with three-state capability for bus-oriented applications.
• LV-TTL Compatibility: All inputs and outputs are directly compatible with LV-TTL levels.
• Battery Backup Operation: Designed for reliable performance in battery-backed systems.

Applications

The HM62W8512B is well-suited for a variety of applications, including:

• Battery Backup Systems: Its low standby power consumption makes it ideal for memory retention in battery-powered devices.
• Embedded Systems: Used in microcontrollers, DSPs, and other embedded applications requiring fast, reliable SRAM.
• Networking Equipment: Suitable for routers, switches, and other networking devices that require high-speed memory.
• Industrial Control Systems: Provides reliable memory for automation and control applications.
• Consumer Electronics: Used in smart devices, gaming consoles, and other consumer products requiring efficient memory solutions.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5 V to +4.6 V
• Input Voltage (V_IN): -0.5 V to V_CC + 0.5 V
• Output Voltage (V_OUT): -0.5 V to V_CC + 0.5 V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 3.3 V ± 0.3 V
• Input High Voltage (V_IH): 2.0 V to V_CC + 0.3 V
• Input Low Voltage (V_IL): -0.3 V to 0.8 V
• Output High Voltage (V_OH): 2.4 V (min) at I_OH = -4.0 mA
• Output Low Voltage (V_OL): 0.4 V (max) at I_OL = 8.0 mA

Power Consumption

• Active Power Dissipation: 16.5 mW/MHz (typical) at 3.3 V
• Standby Power Dissipation: 3.3 µW (typical) at 3.3 V

Package Information

The HM62W8512B is available in two package options, providing flexibility for different mounting and space requirements:

• 525-mil SOP (Small Outline Package): This package offers a balance between size and ease of handling, with a footprint pitch width of 525 mils.
• 400-mil TSOP TYPE II (Thin Small Outline Package): Designed for high-density mounting, this package features a thinner profile and a footprint pitch width of 400 mils.

Package Dimensions

• SOP (525-mil):
  • Width: 525 mils (13.335 mm)
  • Height: 2.65 mm (max)
  • Lead Pitch: 1.27 mm
• TSOP TYPE II (400-mil):
  • Width: 400 mils (10.16 mm)
  • Height: 1.2 mm (max)
  • Lead Pitch: 0.8 mm

Ordering Information

The HM62W8512B is available in different configurations based on speed and package type. Below is a summary of the ordering options:

• HM62W8512B-55: 55 ns access time, available in SOP or TSOP packages.
• HM62W8512B-70: 70 ns access time, available in SOP or TSOP packages.

For detailed ordering information, including part numbers and package codes, refer to the manufacturer's datasheet or contact Hitachi's sales support.

Conclusion

The Hitachi HM62W8512B is a versatile and high-performance 4-Mbit SRAM designed for applications requiring low power consumption, high speed, and reliable operation. Its compatibility with LV-TTL levels, combined with flexible packaging options, makes it an excellent choice for a wide range of electronic systems, from battery backup solutions to industrial controls and consumer electronics. With its advanced Hi-CMOS process technology, the HM62W8512B delivers the density and efficiency needed for modern memory applications.