HM628512 Series
AC Characteristics (Ta = 0 to +70°C, VCC = 5 V ± 10%, unless otherwise noted.)
Test Conditions
•
•
•
•
Input pulse levels: 0.8 V to 2.4 V
Input rise and fall time: 5 ns
Input and output timing reference levels: 1.5 V
Output load: 1 TTL Gate + CL (100 pF) (HM628512-7A/7)
1 TTL Gate + CL (50 pF) (HM628512-5)
(Including scope & jig)
Read Cycle
HM628512
-5
-7A
-7
Min
70
—
—
—
10
5
Parameter
Symbol Min
Max Min
Max
—
Max Unit
Notes
Read cycle time
tRC
tAA
tCO
tOE
tLZ
55
—
—
—
10
5
—
55
55
25
—
—
20
20
—
65
—
—
—
10
5
—
70
70
35
—
—
25
25
—
ns
ns
ns
ns
ns
ns
ns
ns
ns
Address access time
60
65
30
—
Chip select access time
Output enable to output valid
Chip selection to output in low-Z
Output enable to output in low-Z
2
tOLZ
—
2
Chip deselection to output in high-Z tHZ
0
0
20
20
—
0
1, 2
1, 2
Output disable to output in high-Z
Output hold from address change
tOHZ
tOH
0
0
0
10
10
10
Notes: 1. tHZ and tOHZ are defined as the time at which the outputs achieve the open circuit conditions and are
not referred to output voltage levels.
2. This parameter is sampled and not 100% tested.
7
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