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PDF HM62256BLSP-7 Data sheet ( Hoja de datos )
| Número de pieza | HM62256BLSP-7 | |
| Descripción | 256k SRAM (32-kword x 8-bit) | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HM62256B Series
256k SRAM (32-kword × 8-bit)
ADE-203-135F (Z)
Rev. 6.0
Nov. 13, 1997
Description
The Hitachi HM62256B Series is a CMOS static RAM organized 32,768-word × 8-bit. It realizes higher
performance and low power consumption by employing 0.8 µm Hi-CMOS process technology. The
device, packaged in 8 × 14 mm TSOP, 8 × 13.4 mm TSOP with thickness of 1.2 mm, 450 mil SOP (foot
print pitch width), 600 mil plastic DIP, or 300 mil plastic DIP, is available for high density mounting. It
offers low power standby power dissipation; therefore, it is suitable for battery backup systems.
Features
• Single 5.0 V supply: 5.0 V ± 10%
• Access time: 55 ns/70 ns/85 ns (max)
• Power dissipation:
Active: 25 mW (typ) (f = 1 MHz)
Standby: 1.0 µW (typ)
• Completely static memory
No clock or timing strobe required
• Equal access and cycle times
• Common data input and output
Three state output
• Directly TTL compatible all inputs and outputs
• Battery backup operation
1 page  
Operation Table
WE CS
×H
HL
HL
LL
LL
Note: ×: H or L
OE
×
H
L
H
L
HM62256B Series
Mode
Standby
Output disable
Read
Write
Write
VCC current
ISB, ISB1
I CC
I CC
I CC
I CC
I/O pin
High-Z
High-Z
Dout
Din
Din
Ref. cycle
—
—
Read cycle (1)to (3)
Write cycle (1)
Write cycle (2)
Absolute Maximum Ratings
Parameter
Symbol
Power supply voltage relative to VSS
Terminal voltage on any pin relative to VSS
Power dissipation
Operating temperature range
VCC
VT
PT
Topr
Storage temperature range
Tstg
Storage temperature range under bias
Tbias
Notes: 1. VT min: –3.0 V for pulse half-width ≤ 50 ns
2. Maximum voltage is 7.0 V
Value
–0.5 to +7.0
–0.5*1 to VCC+0.3*2
1.0
0 to +70
–55 to +125
–10 to +85
Unit
V
V
W
°C
°C
°C
DC Operating Conditions (Ta = 0 to +70°C)
Parameter
Symbol
Min
Supply voltage
VCC 4.5
VSS 0
Input high voltage
VIH 2.2
Input low voltage
VIL –0.5*1
Note: 1. VIL min: –3.0 V for pulse half-width ≤ 50 ns
Typ
5.0
0
—
—
Max
5.5
0
VCC + 0.3
0.8
Unit
V
V
V
V
Notes
5
5 Page 
Write Timing Waveform (2) (OE Low Fixed)
Address
CS
WE
Dout
tWC
Valid address
tCW
*9
tAW
tWP
tAS
tWHZ
Din High impedance
HM62256B Series
tWR
tOH
tOW
*10 *11
tDW tDH
Valid data
*12
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet HM62256BLSP-7.PDF ] | |
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