Hitachi, Ltd. (TSE: 6501) today announced the industry's first 12-Mbit low-power
SRAM, the HM62V16768MI Series, for use in mobile phones and portable information
terminals. Sample shipments will begin in November 2000 in Japan. This new series
supports high-density mounting and offers high-speed access at a low voltage, with
an access time of 70 ns at 2.2 V (min.) operation.
At the same time, Hitachi announced 8-Mbit low-power SRAMs-the HM62V16512MI
Series, featuring a 55/70 ns access time at 2.2 V (min.) operation, with sample
shipments starting in September of this year in Japan, and the HM62A16512MI Series,
featuring a 70 ns access time at 1.65 V (min.) operation, with sample shipments
starting in December in Japan. These three series use a 6.5 mm x 9.8 mm 48-pin CSP
(Chip Scale Package)-the world's smallest class of package for 8-Mbit SRAM- that
enables portable products to be made smaller and lighter.
With the rapidly increasing sophistication of mobile phone functions, there is a
growing need for the SRAMs used for work memory, phone number lists, and image data
storage in these products to achieve lower-voltage operation, lower current dissipation,
and higher speed to keep pace with lower system voltages, while at the same time
offering larger capacities than the current 4-Mbits together with higher mounting
densities.
To meet these needs, Hitachi has developed a range of 12-Mbit/8-Mbit low-power
SRAMs for use in mobile phones and portable information terminals.
The 12-Mbit low-power SRAM employs chip stacking technology to stack a 4-Mbit and
an 8-Mbit low-power-consumption SRAM chip in a 48-pin CSP package. With a package
size of 6.5 mm x 9.8 mm, this package can be mounted in the same area as an 8-Mbit
SRAM, enabling portable information terminals, with their need for large memory
capacity, to be kept small. The pin arrangement retains 4-Mbit and 8-Mbit upward
-compatibility, and the 4-Mbit and 8-Mbit chips can be controlled independently,
allowing the SRAM to be used in a variety of ways.
The configuration is 768 kwords x 16 bits, and low-voltage, high-speed access is
achieved, with an access time of 70 ns at 2.2 V (min.) operation.
Using a 512 kword x 16-bit configuration and a 0.18 µm CMOS process, and employing
circuit design techniques, the 8-Mbit low-power SRAMs offer low-voltage, high-speed
operation of 55/70 ns at 2.2 V to 3.3 V (HM62V16512MI Series) or 70 ns at 1.65 V to
2.2 V (HM62A16512MI Series). Low-current operation is also achieved, with an
operating current of 25 mA (max.) at 70 ns and a data retention current
of 0.6 µA (typ.)/6.0 µA (max.), enabling data to be retained for long periods
on battery backup in portable information devices and similar products.
The package used is a 6.5 mm x 9.8 mm 48-pin CSP-the world's smallest package
class for 8-Mbit SRAM-for smaller, lighter system products.
Future plans include the development of low-power SRAMs offering even larger
capacities.
< Typical Applications >
Mobile phones
Portable information terminals
< Prices in Japan > (For Reference)
Capacity | Product Code | Sample Price(Yen) | Power Supply Voltage | Access Time | Package |
12 Mbits | HM62V16768 MLBPI-7 | 5,000 | 2.2 V to 3.3 V | 70 ns | CSP 48 |
8 Mbits | HM62V16512 MLBPI-5 | 3,500 | 2.2 V to 3.3 V | 55 ns |
HM62V16512 MLBPI-7 | 3,300 | 70 ns |
HM62A16512 MLBPI-7 | 3,500 | 1.65 V to 2.2 V |
< Specifications >
Item | Specifications |
Capacity | 12 Mbits | 8 Mbits | 8 Mbits |
Product code | HM62V16768MLBPI | HM62V16512MLBPI | HM62A16512MLBPI |
Bit configuration | 768 kwords x 16 bits | 512 kwords x 16 bits | 512 kwords x 16 bits |
Power supply voltage (VCC) | 2.2 V to 3.3 | V2.2 V to 3.3 V | 1.65 V to 2.2 V |
Access time (tAA) | 70 ns max. | 55/70 ns max. | 70 ns max. |
Average operating current (ICC1) | 25 mA max. | 35/25 mA max. | 25 mA max. |
Standby current (ISB1) | 12 µA max. / 4M bit 25 µA max. / 8M bit | 25 µA max. | 20 µA max. |
Data retention current (ICCDR) | 12 µA max. (3V)/ 4M bit 25 µA max. (3V)/ 8M bit | 6 µA max. (1.2V) | 6 µA max. (1.2V) |
Operating temperature | -40 to 85 °C | -40 to 85 °C | -40 to 85 °C |
Package | CSP 48 | CSP 48 | CSP 48 |
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