M67025E Datasheet, PDF (1/27 Pages) ATMEL Corporation – Rad. Tolerant High Speed 8 Kb x 16 Dual Port RAM

Features
• Fast Access Time: 30/45 ns
• Wide Temperature Range: -55°C to +125°C
• Separate Upper Byte and Lower Byte Control for Multiplexed Bus Compatibility
• Expandable Data Bus to 32 bits or More Using Master/Slave Chip Select When Using
More Than One Device
• On-chip Arbitration Logic
• Versatile Pin Select for Master or Slave:
– M/S = H for Busy Output Flag On Master
– M/S = L for Busy Input Flag On Slave
• INT Flag for Port to Port Communication
• Full Hardware Support of Semaphore Signaling Between Ports
• Fully Asynchronous Operation From Either Port
• Battery Back-up Operation: 2V Data Retention
• TTL Compatible
• Single 5V + 10% Power Supply
• QML Q and V with SMD 5962-91617
Introduction
The M67025E is a very low power CMOS dual port static RAM organized as 8192 bit
× 16. The product is designed to be used as a stand-alone 16-bit dual port RAM or as
a combination MASTER/SLAVE dual port for 32-bit or more width systems. The Atmel
MASTER/SLAVE dual port approach in memory system applications results in full
speed, error free operation without the need of an additional discrete logic.
Master and slave devices provide two independent ports with separate control,
address and I/O pins that permit independent, asynchronous access for reads and
writes to any location in the memory. An automatic power down feature controlled by
CS permits the on-chip circuitry of each port in order to enter a very low stand by
power mode.
Using an array of eight transistors (8T) memory cell, the M67025E combines an
extremely low standby supply current (typ = 1.0 µA) with a fast access time at 30 ns
over the full temperature range. All versions offer battery backup data retention capa-
bility with a typical power consumption at less than 5 µW.
For military/space applications that demand superior levels of performance and reli-
ability the M67025E is processed according to the methods of the latest revision of the
MIL PRF 38635 (Q and V) and/or ESA SCC 9000.
Rad. Tolerant
High Speed
8 Kb x 16
Dual Port RAM
M67025E
Rev. 4146J–AERO–06/03
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