Technical Summary: 62G18256 Synchronous Memory Component

Overview

The 62G18256 is a high-performance 4M-bit synchronous memory component designed for applications requiring fast data access and high bandwidth. Operating at frequencies between 200MHz and 250MHz, this component features a 3.3V power supply with ±10%/-5% tolerance and supports HSTL-compatible I/O interfaces. The device is available in a 119-pin BGA package and offers flexible configuration options, including a programmable x36 mode.

Key architectural features include internal self-timed late write operation, byte write control, and differential HSTL clock inputs. The component also includes advanced power management capabilities such as asynchronous sleep mode and programmable impedance output drivers for signal integrity optimization.

Features

• High Performance Operation: 200MHz to 250MHz clock frequency support
• Memory Configuration: 4M-bit density with 256Kx18 organization (expandable to x36)
• Power Supply: 3.3V core voltage with +10%/-5% tolerance
• I/O Compatibility: Full HSTL interface support
• Write Control: Byte write capability with two write select signals (SWEa, SWEb)
• Clock Input: Differential HSTL clock inputs for improved signal integrity
• Advanced Features:
  • Programmable impedance output drivers
  • User-selectable input trip point
  • Asynchronous output enable (G) control
  • Asynchronous sleep mode for power savings
• Package Options: 119-pin BGA (14mm x 22mm footprint)
• Testability: Limited boundary scan support (JTAG IEEE 1149.1 compatible)

Applications

The 62G18256 is suitable for a wide range of high-performance computing and networking applications, including:

• Network routers and switches
• Telecommunications equipment
• High-speed data acquisition systems
• Test and measurement equipment
• Industrial control systems
• Graphics processing units
• Server memory subsystems

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD, VDDQ): -0.5V to +4.6V
• Input Voltage: -0.5V to VDDQ + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -55°C to +125°C

Recommended Operating Conditions

• Core Supply Voltage (VDD): 3.3V ±10%/-5%
• I/O Supply Voltage (VDDQ): 3.3V ±10%/-5%
• Reference Voltage (VREF): 0.49 x VDDQ to 0.51 x VDDQ
• Clock Frequency: 200MHz to 250MHz

Timing Characteristics

Package Information

119-pin BGA Package Details

• Package Designator: BP-119A
• Package Dimensions: 14mm x 22mm body size
• Ball Pitch: 1.27mm
• Ball Count: 119 bumps
• Ball Arrangement: 11 rows x 11 columns (with missing corner bumps)
• Package Material: Thermally enhanced plastic BGA

Pin Assignment Overview

The 119-pin BGA package organizes signals into functional groups:

• Address Inputs (SA0-SA17): 18-bit address bus
• Data I/O (DQa0-DQa8, DQb0-DQb8): 18-bit data bus (expandable to 36-bit)
• Control Signals:
  • K, K: Differential clock inputs
  • G: Output enable
  • SWEa, SWEb: Byte write enables
  • ZZ: Sleep mode control
• Power Supplies:
  • VDD: Core power (3.3V)
  • VDDQ: I/O power (3.3V)
  • VSS: Ground
• Reference Voltage: VREF for input buffer threshold
• JTAG Interface: TMS, TDI, TCK, TDO for boundary scan

Functional Description

Memory Organization

The 62G18256 organizes its 4M-bit memory array as 262,144 words x 18 bits. The architecture supports byte-write operations through two write enable signals (SWEa and SWEb), allowing independent control of the upper and lower bytes. The device can be configured for x36 operation by appropriately connecting two devices.

Clock and Timing

All synchronous operations are referenced to the rising edge of the clock (K). The differential HSTL clock inputs provide improved noise immunity and signal integrity at high frequencies. The internal timing is controlled by a self-timed late write mechanism that automatically manages the write cycle timing.

Power Management

The device features several power-saving modes:

• Asynchronous Sleep Mode: Activated by the ZZ pin, this mode reduces power consumption by disabling internal circuitry while maintaining memory contents
• Programmable Impedance: The ZQ pin allows calibration of output driver impedance to match transmission line characteristics

Ordering Information