Document #: 001-01638 Rev. *H Page 17 of 29
t
INR
INT reset time 35 45 ns
Semaphore Timing
t
SOP
SEM flag update pulse (OE or SEM)10 15 ns
t
SWRD
SEM flag write to read time 10 10 ns
t
SPS
SEM Flag Contention Window 10 10 ns
t
SAA
SEM Address Access Time 40 55 ns
1. To access RAM, CE = L, UB = L, SEM = H. To access semaphore, CE = H and SEM = L. Either condition must be valid for the entire t
SCE
time.
2. At any given temperature and voltage condition for any given device, t
HZCE
is less than t
LZCE
and t
HZOE
is less than t
LZOE
.
3. Test conditions used are Load 3.
4. This parameter is guaranteed but not tested. For information on port-to-port delay through RAM cells from writing port to reading port, refer to Read Timing with
Busy waveform.
5. For information on port-to-port delay through RAM cells from writing port to reading port, refer to Read Timing with Busy waveform.
6. Test conditions used are Load 2.
7. Add 2ns to this value when the I/O ports are operating at different voltages.
8. t
BDD
is a calculated parameter and is the greater of t
WDD
–t
PWE
(actual) or t
DDD
–t
SD
(actual).
Switching Characteristics for V
CC
= 3.0 V Over the Operating Range
Parameter Description
CYDC128B16 CYDC128B16 Unit
-40 -55
Min Max Min Max
Read Cycle
t
RC
Read cycle time 40 55 ns
t
AA
Address to data valid 40 55 ns
t
OHA
Output hold from address change 5 5 ns
t
ACE
[1]
CE LOW to data valid 40 55 ns
t
DOE
OE LOW to data valid 25 30 ns
t
LZOE
[2, 3, 4]
OE Low to low Z 1 1 ns
t
HZOE
[2, 3, 4]
OE HIGH to high Z 15 15 ns
t
LZCE
[2, 3, 4]
CE LOW to low Z 1 1 ns
t
HZCE
[2, 3, 4]
CE HIGH to high Z 15 15 ns
t
PU
[4]
CE LOW to power up 0 0 ns
t
PD
[4]
CE HIGH to power down 40 55 ns
t
ABE
[1]
Byte enable access time 40 55 ns
Write Cycle
t
WC
Write cycle time 40 55 ns
t
SCE
[1]
CE LOW to write end 30 45 ns
t
AW
Address valid to write end 30 45 ns
t
HA
Address hold from write end 0 0 ns
t
SA
[1]
Address setup to write start 0 0 ns
t
PWE
Write pulse width 25 40 ns
t
SD
Data setup to write end 20 30 ns
Switching Characteristics for V
CC
= 2.5 V Over the Operating Range (continued)
Parameter Description
CYDC128B16 CYDC128B16
Unit-40 -55
Min Max Min Max
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