MB81F641642D Fujitsu Microelectronics, MB81F641642D Datasheet - Page 30

• Manufacturer Part Number: MB81F641642D
• Description: 4 x 1M x 16-Bit SDRAM
• Manufacturer: Fujitsu Microelectronics

30
MB81F641642D-75/-102/-102L
LATENCY - FIXED VALUES
(The latency values on these parameters are fixed regardless of clock period.)
Notes: *1. AC characteristics are measured after following the POWER-UP INITIALIZATION procedure.
CKE to Clock Disable
DQM to Output in High-Z
DQM to Input Data Delay
Last Output to Write Command
Delay
Write Command to Input Data
Delay
Precharge to Output
in High-Z Delay
Burst Stop Command to
Output in High-Z Delay
CAS to CAS Delay (min)
CAS Bank Delay (min)
*10. All base values are measured from the clock edge at the command input to the clock edge for the next
*2. AC characteristics assume t
*3. 1.4 V is the reference level for measuring timing of input signals. Transition times are measured
*4. This value is for reference only.
*5. If input signal transition time (t
*6. t
*7. t
*8. Specified where output buffer is no longer driven.
*9. Actual clock count of t
Parameter
between V
(max), and t
t
spec values.
command input. All clock counts are calculated by a simple formula: clock count equals base value
divided by clock period (round off to a whole number).
OH
AC
AC
also specifies the access time at burst mode .
and t
(min) spec values, and (t
OH
IH
are the specs value under AC test load circuit shown in Fig. 4.
CKSP
(min) and V
CL = 2
CL = 3
CL = 2
CL = 3
(min) spec values, [(t
Notes
RC
IL
(l
Symbol
RC
(max). (See Fig. 5)
l
l
l
l
l
l
) will be sum of clock count of t
l
l
l
l
l
ROH2
ROH3
BSH2
BSH3
T
T
OWD
DWD
DQD
CKE
DQZ
CCD
CBD
= 1 ns and 50 pF of capacitive load.
–1.0) ns should be added to t
T
) is longer than 1 ns; [(t
MB81F641642D
T
/2) –0.5] ns should be subtracted from t
-75
1
2
0
2
0
2
3
2
3
1
1
T
Preliminary (AE4.1E)
/2) –0.5] ns should be added to t
MB81F641642D
-102/-102L
RAS
CH
(min), t
(l
RAS
1
2
0
2
0
2
3
2
3
1
1
) and t
CL
(min), t
RP
@66MHz(CL=2)
(l
RP
Reference
LZ
SI
).
(min), t
(min), and t
Value
1
2
0
2
0
2
3
2
3
1
1
HZ
AC
(min), and
(max), t
*4
HI
(min)
cycle
cycle
cycle
cycle
cycle
cycle
cycle
cycle
cycle
cycle
cycle
Unit
HZ