IS42S16400D-6TLI-TR ISSI, Integrated Silicon Solution Inc, IS42S16400D-6TLI-TR Datasheet - Page 22

• Manufacturer Part Number: IS42S16400D-6TLI-TR
• Description: IC SDRAM 64MBIT 166MHZ 54TSOP
• Manufacturer: ISSI, Integrated Silicon Solution Inc

Specifications of IS42S16400D-6TLI-TR

• Format - Memory: RAM
• Memory Type: SDRAM
• Memory Size: 64M (4M x 16)
• Speed: 166MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 54-TSOP II
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IS42S16400D
possible CAS latency; data element n + 3 is either the last of
a burst of four or the last desired of a longer burst. Following
the PRECHARGE command, a subsequent command to the
same bank cannot be issued until t
of the row precharge time is hidden during the access of the
last data element(s).
In the case of a fixed-length burst being executed to
completion, a PRECHARGE command issued at the
optimum time (as described above) provides the same
operation that would result from the same fixed-length
burst with auto precharge. The disadvantage of the
PRECHARGE command is that it requires that the com-
mand and address buses be available at the appropriate
time to issue the command; the advantage of the
PRECHARGE command is that it can be used to truncate
CAS Latency
22
COMMAND
COMMAND
CLK
CLK
DQ
DQ
RP
is met. Note that part
READ
READ
T0
T0
CAS Latency - 2
NOP
NOP
CAS Latency - 3
T1
T1
t
LZ
t
AC
fixed-length or full-page bursts.
Full-page READ bursts can be truncated with the BURST
TERMINATE command, and fixed-length READ bursts
may be truncated with a BURST TERMINATE command,
provided that auto precharge was not activated. The
BURST TERMINATE command should be issued x cycles
before the clock edge at which the last desired data
element is valid, where x equals the CAS latency minus
one. This is shown in the READ Burst Termination
diagram for each possible CAS latency; data element n +
3 is the last desired data element of a longer burst.
NOP
NOP
T2
T2
D
OUT
Integrated Silicon Solution, Inc. — www.issi.com
t
t
OH
LZ
t
AC
NOP
T3
T3
D
DON'T CARE
UNDEFINED
OUT
t
OH
T4
11/21/07
Rev. E