SDA9251-2X Datasheet, PDF (13/23 Pages) Siemens Semiconductor Group – 868352-Bit Dynamic Sequential Access Memory for Television Applications (TV-SAM)

SDA 9251-2X
AC Characteristics (cont’d)
V_CC = 5 V ± 10 %; T_A = 0 to 70 °C
Parameter
Symbol
Limit Values
min. typ. max.
WT to RE lead time t_WRL
30
RE to WT lead time t_WRL
50
Output buffer turn- t_OFF
0
20
off delay
WT to SCB delay t_WTD
0
time
WT to SCB lead
t_WTL
15
time
WT pulse width
t_WTP
10
OEA to output A
t_OAA
25
access time
OEB to output B
t_OBA
25
access time
Access time from t_CAA
25
SCA
Access time from t_CBA
25
SCB
Data input set-up t_DS
5
time to SCB
Data input hold time t_DH
6
to SCB
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Test Condition
t_WRL and t_WRL are restrictive
operating parameters only
in memory write transfer
cycles. In that case t_WRL
applies if the write transfer
from shifter C to latch C
occurs before the rising
edge of RE. Otherwise
t_RWL has to be satisfied.
See diagram 4
See WT to RE lead time
t_OFF (max) defines the time
at which the output
achieves the open-circuit
condition and is not
referenced to output
voltages levels.
See diagram 4
See diagram 4
See diagram 4
See diagram 2, 5
See diagram 3, 5
See diagram 2
See diagram 3
See diagram 5
See diagram 5
Semiconductor Group
171