V54C316162V
AC Characteristics (1,2,3) (Continued)
T = 0 to 70°C; V = 0 V; V = 3.3 V ± 0.3 V, t = 1 ns
A
SS
CC
T
Limit Values
-55
-5
-6
-7
#
Symbol Parameter
Min.
Max.
Min. Max.
Min.
Max.
Min.
Max.
Unit
24 tSREX
Read Cycle
25 tOH
Self Refresh Exit Time
2 CLK + tRC
2 CLK + tRC
6
Data Out Hold Time
2.5
–
2.5
–
2.5
–
2.5
–
ns
ns
27 tHZ
CAS Latency = 3
CAS Latency = 2
–
–
5
7
–
–
5.3
7
–
–
5.5
7
–
–
5.5
7
28 tDQZ
DQM Data Out Disable Latency
2
–
2
–
2
–
2
–
CLK
Write Cycle
29 tWR
Write Recovery Time
CAS Latency = 3
CAS Latency = 2
5
10
–
–
5.5
10
–
–
6
10
–
–
7
10
–
–
ns
ns
30 tDQW
DQM Write Mask Latency
0
–
0
–
0
–
0
–
CLK
Notes for AC Parameters:
1. For proper power-up see the operation section of this data sheet.
2. AC timing tests have V = 0.8V and V = 2.0V with the timing referenced to the 1.4 V crossover point. The transition
IL
IH
time is measured between V and V . All AC measurements assume t = 1ns with the AC output load circuit shown
IH
IL
T
in Figure 1.
tCK
VIH
VIL
CLK
+ 1.4 V
t
T
tCS
tCH
50 Ohm
1.4V
COMMAND
Z=50 Ohm
I/O
tAC
tAC
tLZ
50 pF
tOH
1.4V
OUTPUT
tHZ
Figure 1.
3. If clock rising time is longer than 1 ns, a time (t /2 – 0.5) ns has to be added to this parameter.
T
4. If t is longer than 1 ns, a time (t – 1) ns has to be added to this parameter.
T
T
5. These parameter account for the number of clock cycle and depend on the operating frequency of the clock, as
follows:
the number of clock cycle = specified value of timing period (counted in fractions as a whole number)
6. Self Refresh Exit is a synchronous operation and begins on the 2nd positive clock edge after CKE returns high.
Self Refresh Exit is not complete until a time period equal to tRC is satisfied once the Self Refresh Exit command
is registered.
V54C316162V Rev. 2.9 September 2001
11
MOSEL [ MOSEL VITELIC, CORP ]
