CY6264

CY6264: 64K (8K x 8) High-Performance CMOS Static RAM

Overview

The CY6264 is a high-performance CMOS static RAM organized as 8,192 words by 8 bits. It is designed for applications requiring fast, low-power memory with simple interfacing. The device features an automatic power-down mode when deselected, reducing power consumption by over 70%. The CY6264 is housed in a 450-mil (300-mil body) SOIC package, making it suitable for space-constrained applications.

This SRAM is ideal for embedded systems, industrial controls, and other applications where reliable, high-speed memory is required. Its three-state outputs and dual chip enable inputs (CE1 and CE2) simplify memory expansion in larger systems.

Key Features

• High-Speed Operation: Available with 55 ns and 70 ns access times
• Low Power Consumption: CMOS technology provides optimal speed/power performance
• Automatic Power-Down: Reduces power consumption by over 70% when deselected
• Simple Memory Expansion: Enabled by CE1 (active LOW), CE2 (active HIGH), and OE (active LOW) control signals
• Three-State Outputs: For easy bus interface
• Wide Operating Voltage: Compatible with standard CMOS logic levels
• Standard Package: 450-mil (300-mil body) SOIC for space-efficient designs
• Reliable Operation: Industrial temperature range available

Applications

The CY6264 is suitable for a wide range of applications including:

• Embedded systems and microcontrollers
• Industrial control systems
• Telecommunications equipment
• Networking devices
• Medical instrumentation
• Automotive electronics
• Data acquisition systems
• Test and measurement equipment

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (Vcc): -0.5V to +7.0V
• Input Voltage (Vin): -0.5V to Vcc + 0.5V
• Output Voltage (Vout): -0.5V to Vcc + 0.5V
• Operating Temperature Range: Commercial (0°C to +70°C), Industrial (-40°C to +85°C)
• Storage Temperature Range: -65°C to +150°C

DC Characteristics (TA = 25°C, Vcc = 5V ±10%)

• Input High Voltage (VIH): 2.2V min
• Input Low Voltage (VIL): 0.8V max
• Output High Voltage (VOH): 2.4V min (Iout = -1.0 mA)
• Output Low Voltage (VOL): 0.4V max (Iout = 2.1 mA)
• Supply Current (Active, ICC): 70 mA max (55 ns), 60 mA max (70 ns)
• Supply Current (Standby, ISB1): 10 mA max (CMOS level inputs)
• Supply Current (Standby, ISB2): 5 mA max (TTL level inputs)

AC Characteristics

• Read Cycle Time (tRC): 55 ns/70 ns
• Address Access Time (tAA): 55 ns/70 ns
• Chip Enable to Output Valid (tACE): 55 ns/70 ns
• Output Enable to Output Valid (tOE): 20 ns max
• Chip Enable to Power-Up Time (tPU): 0 ns min
• Chip Disable to Power-Down Time (tPD): 30 ns max
• Write Cycle Time (tWC): 55 ns/70 ns
• Write Pulse Width (tWP): 45 ns/60 ns
• Data Setup Time (tDS): 25 ns min
• Data Hold Time (tDH): 0 ns min
• Address Setup Time (tAS): 0 ns min
• Address Hold Time (tAH): 10 ns min

Functional Description

The CY6264 operates as follows:

Read Operation

The device is selected when CE1 is LOW and CE2 is HIGH. With OE LOW and WE HIGH, the data stored at the location specified by the address inputs (A0-A12) appears on the I/O pins (I/O0-I/O7). The outputs remain in high-impedance state when either OE is HIGH or the device is deselected (CE1 HIGH or CE2 LOW).

Write Operation

The device is selected when CE1 is LOW and CE2 is HIGH. With WE LOW, data on the I/O pins is written into the memory location specified by the address inputs. The OE signal is a "don't care" during write operations.

Power-Down Mode

When CE1 is HIGH or CE2 is LOW, the device enters power-down mode, reducing power consumption significantly. The I/O pins enter high-impedance state regardless of OE or WE inputs.

Package Information

The CY6264 is available in a 28-pin Small Outline Integrated Circuit (SOIC) package with the following dimensions:

• Package Type: 28-pin SOIC (450-mil body width)
• Package Width: 7.50 mm (300 mil) body, 10.30 mm (450 mil) including leads
• Package Length: 17.90 mm max
• Lead Pitch: 1.27 mm (50 mil)
• Lead Count: 28
• Moisture Sensitivity Level (MSL): MSL 3

Pin Configuration

The 28-pin SOIC package has the following pinout:

• Pins 1-13: Address Inputs (A0-A12)
• Pins 14: Chip Enable 1 (CE1, active LOW)
• Pins 15: Write Enable (WE, active LOW)
• Pins 16: Chip Enable 2 (CE2, active HIGH)
• Pins 17: Output Enable (OE, active LOW)
• Pins 18-25: Data Input/Output (I/O0-I/O7)
• Pins 26: Ground (GND)
• Pins 27: No Connect (NC)
• Pins 28: Power Supply (Vcc)

Ordering Information

The CY6264 is available in different speed grades and temperature ranges:

• CY6264-55PC: 55 ns access time, commercial temperature range (0°C to +70°C), plastic DIP
• CY6264-70PC: 70 ns access time, commercial temperature range, plastic DIP
• CY6264-55SC: 55 ns access time, commercial temperature range, SOIC
• CY6264-70SC: 70 ns access time, commercial temperature range, SOIC
• CY6264-55ZI: 55 ns access time, industrial temperature range (-40°C to +85°C), SOIC
• CY6264-70ZI: 70 ns access time, industrial temperature range, SOIC

Quality and Reliability

The CY6264 meets or exceeds the following quality and reliability standards:

• Industrial-grade devices support extended temperature range
• ESD protection exceeds 2000V (Human