CAT28C64B
A.C. CHARACTERISTICS, Read Cycle
CC = 5V ±10%, unless otherwise specified.
V
28C64B-12
28C64B-15
Symbol
tRC
Parameter
Read Cycle Time
Min. Max. Min. Max. Units
120
150
ns
ns
ns
ns
ns
ns
ns
ns
ns
tCE
CE Access Time
120
120
60
150
150
70
tAA
Address Access Time
OE Access Time
tOE
(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
(1)
tOLZ
(1)(2)
tHZ
50
50
50
50
(1)(2)
tOHZ
(1)
tOH
0
0
Figure 1. A.C. Testing Input/Output Waveform(3)
2.4 V
2.0 V
0.8 V
INPUT PULSE LEVELS
0.45 V
REFERENCE POINTS
5096 FHD F03
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
5096 FHD F04
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. 25006-0A 2/98 P-1
5
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