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CYDC256B16, CYDC128B16,
CYDC064B16, CYDC128B08,
CYDC064B08
Document #: 001-01638 Rev. *E Page 13 of 26
7
AC Test Loads and Waveforms
Switching Characteristics for V
CC
= 1.8V Over the Operating Range
[27]
Parameter Description
CYDC256B16,
CYDC128B16,
CYDC064B16,
CYDC128B08,
CYDC064B08
CYDC256B16,
CYDC128B16,
CYDC064B16,
CYDC128B08,
CYDC064B08
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
[28]
CE LOW to Data Valid 40 55 ns
t
DOE
OE LOW to Data Valid 25 30 ns
t
LZOE
[29, 30, 31]
OE Low to Low Z 5 5 ns
t
HZOE
[29, 30, 31]
OE HIGH to High Z 15 25 ns
t
LZCE
[29, 30, 31]
CE LOW to Low Z 5 5 ns
t
HZCE
[29, 30, 31]
CE HIGH to High Z 15 25 ns
t
PU
[31]
CE LOW to Power-Up 0 0 ns
t
PD
[31]
CE HIGH to Power-Down 40 55 ns
t
ABE
[28]
Byte Enable Access Time 40 55 ns
Write Cycle
t
WC
Write Cycle Time 40 55 ns
t
SCE
[28]
CE LOW to Write End 30 45 ns
t
AW
Address Valid to Write End 30 45 ns
Notes:
27.Test conditions assume signal transition time of 3 ns or less, timing reference levels of V
CC
/2, input pulse levels of 0 to V
CC
, and output loading of the specified
I
OI
/I
OH
and 30-pF load capacitance.
28.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.
29.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
.
30.Test conditions used are Load 3.
31.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
1.8V
GND
90%
90%
10%
10%
ALL INPUT PULSES
(a) Normal Load (Load 1)
R1
3.0V/2.5V/1.8V
OUTPUT
R2
C = 30 pF
V
TH
= 0.8V
OUTPUT
(b) Thévenin Equivalent (Load 1)
(c) Three-State Delay (Load 2)
R1
R2
3.0V/2.5V/1.8V
OUTPUT
R
TH
= 6 kΩ
≤ 3 ns
≤ 3 ns
including scope and jig)
(Used for t
LZ
, t
HZ
, t
HZWE
, and t
LZWE
3.0V/2.5V 1.8V
R1 1022
Ω 13500Ω
R2 792Ω 10800Ω
C = 30 pF
C = 5 pF
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