LH5P864N-80 Просмотр технического описания (PDF) - Sharp Electronics
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LH5P864N-80 Datasheet PDF : 10 Pages
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LH5P864
CMOS 512K (64K × 8) Pseudo-Static RAM
AC CHARACTERISTICS 1,2,3 (TA = 0 to +70°C, VCC = 5.0 V ±10%)
PARAMETER
SYMBOL MIN.
MAX.
UNIT
NOTE
Random read, write cycle time
tRC
140
ns
Read modify write cycle time
tRMW
205
ns
CE pulse width
tCE
80
10,000
ns
CE precharge time
tP
50
ns
Address setup time
tAS
0
ns
4
Address hold time
tAH
20
ns
4
Read command setup time
tRCS
0
ns
Read command hold time
tRCH
0
ns
CE access time
tCEA
80
ns
5
OE access time
tOEA
30
ns
5
CE to output in Low-Z
tCLZ
20
ns
OE to output in Low-Z
tOLZ
0
ns
R/W to output in Low-Z
tWLZ
0
ns
Chip disable to output in High-Z
tCHZ
25
ns
Output disable to output in High-Z
tOHZ
25
ns
Write enable to output in High-Z
tWHZ
25
ns
OE setup time
tOES
10
ns
OE hold time
tOEH
10
ns
OE lead time
tOEL
10
ns
Write command pulse width
tWCP
30
ns
Write command setup time
tWCS
30
ns
Write command hold time
tWCH
50
ns
Data setup time from write
tDSW
30
ns
6
Data setup time from CE
tDSC
30
ns
6
Data hold time from write
tDHW
0
ns
6
Data hold time from CE
tDHC
0
ns
6
Transition time (rise and fall)
tT
3
35
ns
Refresh time interval
tREF
8
ms
Auto refresh cycle time
tFC
130
ns
Refresh delay time from CE
tRFD
50
ns
Refresh pulse width (Auto refresh)
tFAP
30
8,000
ns
Refresh precharge time (Auto refresh)
tFP
30
ns
CE delay time from refresh precharge (Auto
refresh)
tFCE
160
ns
Refresh pulse width (Self refresh)
tFAS
8,000
ns
CE delay time from refresh precharge (Self refresh) tFRS
160
ns
NOTES:
1. In order to initialize the circuit, CE1, CE2 and OE/RFSH should
be kept in VIH for 100 µs after power-up and followed by at least
8 dummy cycles.
2. AC characteristics are measured at tT = 5 ns.
3. AC characteristics are measured at the following condition (see
figure at right).
4. Address is latched at the negative edge of CE1 or CE2.
5. Measured with a load equivalent to 2TTL + 100 pF.
6. Data is latched at the positive edge of R/W or at the positive edge
of CE1 or CE2.
INPUT
OUTPUT
2.4 V
0.8 V
2.2 V
0.8 V
Figure 3. AC Characteristics
2.6 V
0.6 V
5P864-3
4
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