
HYB25L512160AC–7.5
512MBit Mobile-RAM
Functional Description
Data Sheet
23
Rev. 1.3, 2004-04
10212003-BSPE-77OL
The starting column and bank addresses are provided with the READ command and Auto Precharge is either
enabled or disabled for that burst access. If Auto Precharge is enabled, the row being accessed starts precharge
at the completion of the burst, provided t
RAS
has been satisfied. For the generic READ commands used in the
following illustrations, Auto Precharge is disabled.
During READ bursts, the valid data-out element from the starting column address is available following the CAS
latency after the READ command. Each subsequent data-out element is valid nominally at the next positive clock
edge. Upon completion of a READ burst, assuming no other READ command has been initiated, the DQs go to
High-Z state.
Figure 16
and
Figure 17
show single READ bursts for each supported CAS latency setting.
Figure 16
Single READ Burst (CAS Latency = 2)
Table 10
Parameter
Timing Parameters for READ
Symbol – 7.5
Unit
Notes
min.
—
—
1.0
3.0
3.0
—
67
19
45
19
max.
6.0
8.0
—
7.0
—
2
—
—
100k
—
Access time from CLK
V
DDQ
= 2.3V .. 3.6V
V
DDQ
= 1.65V .. 1.95V
t
AC
t
AC
t
LZ
t
HZ
t
OH
t
DQZ
t
RC
t
RCD
t
RAS
t
RP
ns
ns
ns
ns
ns
t
CK
ns
ns
ns
ns
1)
1) t
AC
depends on V
DDQ
range; no dependency on CAS latency setting
2) These parameters account for the number of clock cycles and depend on the operating frequency as follows:
no. of clock cycles = specified delay / clock period ; round up to next integer.
1)
DQ low-impedance time from CLK
DQ high-impedance time from CLK
Data out hold time
DQM to DQ High-Z delay (READ Commands)
ACTIVE to ACTIVE command period
ACTIVE to READ or WRITE delay
ACTIVE to PRECHARGE command period
PRECHARGE command period
2)
2)
2)
2)
Ba A, Col n = bank A, column n
DO n = Data Out from column n
Burst Length = 4 in the case shown.
3 subsequent elements of Data Out are provided in the programmed order following DO n.
= Don't Care
CL=2
t
RCD
t
RAS
t
RC
t
RP
CLK
Command
NOP
READ
NOP
NOP
NOP
PRE
NOP
ACT
ACT
Address
Ba A,
Row b
Ba A,
Col n
Ba A,
Row x
A10 (AP)
Pre Bank A
Pre All
Dis AP
Row x
Row b
AP
DO n+1
DO n
DO n+2
DO n+3
DQ
AP = Auto Precharge
Dis AP = Disable Auto Precharge