Hitachi, Ltd. (TSE: 6501) today announced three new 4-Mbit low-power SRAM series
offering high-speed operation at a low voltage, for use in mobile phones and portable
information terminals: the HM62V16256C/HM62V16258C Series, with a 55/70 ns
access time at 2.2 V (min) operation, and the HM62A16256C Series, with a 70 ns access
time at 1.65 V (min) operation. Sample shipments will begin in February, 2000 in Japan.
These new series use a 6.5 mm x 6.5 mm CSP (Chip Scale Package)--the world's
smallest package size for 4-Mbit SRAM--that enables user systems to be made smaller
and lighter.
In addition to providing high-speed data read/write access time and low-voltage data
retention, low-power SRAMs also enable system design to be simplified as refresh
operations are not necessary. These features have led to the use of low-power SRAMs in
a wide range of fields from telecommunications and industrial applications to consumer
products.
With the current popularity of mobile phones, in particular, low-power SRAMs are in
great demand for use as work memory, and for phone number and image data storage.
This trend has led to a growing need for SRAMs offering lower-voltage, lower-current,
and higher-speed operation in line with the lower voltages of user systems.
Following on from the HM62W16256B/HM62W16258B Series and
HM62V16256B/HM62V16258B Series of 4-Mbit low-power SRAMs currently in
production, with access time of 55 ns at 3.0 V to 3.6 V and 70 ns at 2.7 V to 3.6 V,
Hitachi has now developed three new series of low-power 4-Mbit SRAMs offering even
smaller package size, lower voltage and current, and higher speed.
Using a 256 kword x 16-bit configuration and a 0.18 um CMOS process, and employing
special circuit design techniques, these new series offer high-speed operation at least
equal to that of previous Hitachi models, but achieved at a lower voltage--55/70 ns at 2.2
V to 3.6 V for the HM62V16256C/HM62V16258C Series, and 70 ns at 1.65 V to 2.0 V
for the HM62A16256C Series. In addition, the operating current of 25 mA (max) at 70
ns and the data retention current of 0.8 uA (typ)/3.0 uA (max) are 60 to 70% lower than
those of previous Hitachi models, enabling data to be retained for long periods on battery
backup in portable information devices and similar products.
The packages used are a 44-pin TSOP-II and a 6.5 mm x 6.5 mm 48-pin CSP--the
world's smallest package size for 4-Mbit SRAM--for smaller, lighter systems.
The HM62V16256C has two chip select pins, while the HM62V16258C has one.
The product lineup consists of 12 models offering different combinations of access time
(55 ns or 70 ns), current grade (low-power version (L version) or super-low-power
version (SL version)), operating temperature range (-20 to 70degrees Celsius or -40 to
85degrees Celsius), and package (TSOP-II or CSP), to meet a wide variety of needs from
industrial and consumer applications to mobile phones.
Future plans include the development of 4-Mbit low-power SRAMs with a x8-bit
configuration.
Typical Applications
Mobile phones
Portable information terminals
Handheld terminals
Communication products
Control products
Measuring instruments
Prices in Japan (For Reference)
Sample Price Power Supply Access Current
Part Number (Yen) Voltage Package Time Grade
HM62V16258CLTT-5 1,800 2.2 V to 3.6 V TSOP-II 44 55 ns L version
HM62V16258CLTT-7 1,740 70 ns
HM62V16258CLTT- 1,860 55 ns SL version
5SL
HM62V16258CLTT- 1,800 70 ns
7SL
HM62V16258CLTTI- 1,980 70 ns L version
7*
HM62V16256CLTT-5 1,800 2.2 V to 3.6 V TSOP-II 44 55 ns L version
HM62V16256CLTT-7 1,740 70 ns
HM62V16256CLTT- 1,860 55 ns SL version
5SL
HM62V16256CLTT- 1,800 70 ns
7SL
HM62V16256CLBPI- 1,800 CSP 48 70 ns L version
7*
HM62V16256CLBPI- 1,860 70 ns SL version
7SL*
HM62A16256CLBPI- 1,860 1.65 V to 2.0 CSP 48 70 ns L version
7* V
Note: * Type with operating temperature range of -40 to 85degrees Celsius
Specifications
Item Specifications
Part Number HM62V16258CLTT HM62V16256CLB HM62A16256CLB
HM62V16256CLTT PI PI
Bit configuration 256 kwords x 16 bits 256 kwords x 16 256 kwords x 16
bits bits
Power supply voltage (VCC) 2.2 V to 3.6 V 2.2 V to 3.6 V 1.65 V to 2.0 V
Access time (tAA) 55/70 ns max 70 ns max 70 ns max
Average operating current 35/25 mA max 25 mA max 25 mA max
(ICC1)
Standby current L version 30 uA max 12 uA max 5 uA max
(ISB1) SL version 5 uA max 5 uA max ---
Data retention L version 20 uA max (3 V) 7 uA max (3 V) 3 uA max (1.2 V)
current (ICCDR) SL version 3 uA max (3 V) 3 uA max (3 V) ---
Operating temperature -20to70/-40to85degreesC -40to85degreesC -40to85degreesC
Package TSOP-II 44 CSP 48 CSP 48
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