CAT28C64B
A.C. CHARACTERISTICS, Read Cycle
VCC = 5V 10%, unless otherwise specified.
28C64B-90
28C64B-12
28C64B-15
Symbol Parameter
Min.
Max.
Min.
Max.
Min. Max.
Units
ns
tRC
tCE
tAA
tOE
Read Cycle Time
90
120
150
150
150
70
0
CE Access Time
90
90
50
120
120
60
ns
Address Access Time
OE Access Time
ns
ns
(1)
tLZ
CE Low to Active Output
OE Low to Active Output
CE High to High-Z Output
OE High to High-Z Output
Output Hold from Address Change
0
0
0
0
ns
(1)
tOLZ
0
ns
(1)(2)
tHZ
50
50
50
50
50
50
0
ns
(1)(2)
tOHZ
ns
(1)
tOH
0
0
ns
Figure 1. A.C. Testing Input/Output Waveform(3)
V
- 0.3V
CC
2.0 V
0.8 V
INPUT PULSE LEVELS
REFERENCE POINTS
0.0 V
Figure 2. A.C. Testing Load Circuit (example)
1.3V
1N914
3.3K
DEVICE
UNDER
TEST
OUT
C
= 100 pF
L
C
INCLUDES JIG CAPACITANCE
L
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) Output floating (High-Z) is defined as the state when the external data line is no longer driven by the output buffer.
(3) Input rise and fall times (10% and 90%) < 10 ns.
Doc. No. 1011, Rev. F
5
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