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LC321664AM bảng dữ liệu(PDF) 7 Page - Sanyo Semicon Device

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Giải thích chi tiết về linh kiện  1 MEG (65536 words X 16 bits) DRAM Fast Page Mode, Byte Write
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LC321664AJ, AM, AT-80
No. 4795-7/30
Notes:
6)
After the power is turned on, 200 µs are required after the arrival of VCC stabilized current before
memory is initialized and begins operation. In addition, before memory operation initializes,
approximately 8 cycles worth of RAS dummy cycles are required. When the on-chip refresh counter is
applied, approximately 8-cycles worth of CAS-before-RAS dummy cycles are required instead of the
RAS dummy cycles.
7)
Measured at tT = 5 ns.
8)
When measuring input signal timing, VIH (min) and VIL (max) are used for reference points. In
addition, rise and fall time are defined between VIH and VIL.
9)
Measured using an equivalent of 50 pF and one standard TTL load.
10) tOFF (max) and tOEZ (max) are defined as the time until output voltage can no longer be measured when
output switches to a high impedance condition.
11) Operation is guaranteed if either tRRH or tRCH are satisfied.
12) These parameters are measured from the falling edge of CAS for an early-write cycle, and from the
falling edge of UW and LW for a read-write/read-modify-write cycle.
13) tWCS, tCWD, tRWD, tAWD and tCPWD are not restrictive operating parameters for memory in that they
specify the operating mode. If tWCS ≥ tWCS (min), the cycle switches to an early-write cycle and output
pins switch to high impedance throughout the cycle. If tCWD ≥ tCWD (min), tRWD ≥ tRWD (min), tAWD
tAWD (min) and tCPWD ≥ tCPWD (min), the cycle switches to a read-write/read-modify-write cycle and
data outputs equal information in the selected cells. If neither of the above conditions are satisfied,
output pins are in an undefined state.
14) tRCD (max) does not indicate a restrictive operating parameter but instead represents the point at which
the access time tRAC (max) is guaranteed. If tRCD ≥ tRCD (max), access time is determined according to
tCAC.
15) tRAD (max) does not indicate a restrictive operating parameter but instead represents the point at which
the access time tRAC (max) is guaranteed. If tRAD ≥ tRAD (max), access time is determined according to
tAA.
16) Operation is guaranteed if either tDZC or tDZO are satisfied.


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