Hitachi HM62V16258B 4-Mbit Static RAM

Overview

The Hitachi HM62V16258B 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, high speed, and low power consumption, making it an ideal choice for battery-backed applications. The device operates on a single 3.0 V supply, with a wide voltage range of 2.7 V to 3.6 V, ensuring compatibility with modern low-power systems.

Designed for applications requiring fast and reliable memory access, the HM62V16258B features a completely static memory architecture, eliminating the need for clock signals or timing strobes. Its low standby power dissipation (3 µW typical) makes it particularly suitable for portable and battery-operated devices.

Features

• Single 3.0 V Supply: Operates within a voltage range of 2.7 V to 3.6 V, ensuring compatibility with low-power systems.
• Fast Access Time: Maximum access times of 70 ns and 85 ns, enabling high-speed data retrieval.
• Low Power Dissipation:
  • Active mode: 9 mW (typical)
  • Standby mode: 3 µW (typical)
• 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: Ideal for applications requiring non-volatile memory support during power loss.

Applications

The HM62V16258B is designed for a wide range of applications, particularly those requiring high-speed, low-power memory solutions. Key applications include:

• Battery-Powered Devices: Portable electronics, handheld instruments, and medical devices benefit from its low standby power consumption.
• Embedded Systems: Microcontroller-based systems requiring fast and reliable SRAM for data storage.
• Industrial Control Systems: Real-time control applications where consistent memory access times are critical.
• Telecommunications: Networking equipment and communication devices requiring high-speed memory buffers.
• Automotive Electronics: Infotainment systems and engine control units where reliability and low power are essential.

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
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 2.7 V to 3.6 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
• Operating Temperature: -40°C to +85°C

DC Characteristics

• Supply Current (Active, I_CC): 3 mA (typical) at 70 ns access time
• Supply Current (Standby, I_SB): 1 µA (typical) at 3.0 V
• Input Leakage Current (I_LI): ±1 µA (max)
• Output Leakage Current (I_LO): ±1 µA (max)

AC Characteristics

• Read Cycle Time (t_RC): 70 ns (max) for -70 variant, 85 ns (max) for -85 variant
• Write Cycle Time (t_WC): 70 ns (max) for -70 variant, 85 ns (max) for -85 variant
• Address Setup Time (t_AS): 0 ns (min)
• Address Hold Time (t_AH): 10 ns (min)
• Output Enable to Output Valid (t_OE): 25 ns (max)

Package Information

The HM62V16258B is available in a standard 44-pin Plastic Thin Small Outline Package (TSOP-II). Key package specifications include:

• Package Type: TSOP-II (44-pin)
• Package Dimensions: 10.16 mm × 18.41 mm × 1.2 mm (typical)
• Pin Pitch: 0.8 mm
• Lead Material: Copper alloy
• Lead Finish: Matte tin (RoHS compliant)

Pin Configuration

The 44-pin TSOP-II package includes the following key pins:

• A0-A17: 18-bit address inputs
• DQ0-DQ15: 16-bit bidirectional data bus
• CE: Chip enable (active low)
• OE: Output enable (active low)
• WE: Write enable (active low)
• V_CC: Power supply (2.7 V to 3.6 V)
• GND: Ground

Conclusion

The Hitachi HM62V16258B is a high-performance, low-power 4-Mbit SRAM designed for applications requiring reliable and fast memory access. Its combination of high density, low standby power, and wide operating voltage range makes it an excellent choice for battery-backed and portable systems. The 44-pin TSOP-II package ensures compact and efficient integration into modern electronic designs.