AC CHARACTERISTICS READ CYCLE
1,2
(V
DD
= 5.0V±10%)
SYMBOL
PARAMETER
7C138 - 45
7C139 - 45
MIN
MAX
7C138 - 55
7C139 - 55
MIN MAX
UNIT
t
RC
t
AA
t
OHA
t
ACE
t
DOE
t
LZOE
t
HZOE
t
LZCE
t
HZCE
Read cycle time
Address to data valid
2
Output hold from address change
CE LOW to data valid
2
OE LOW to data valid
2
OE LOW to low Z
OE HIGH to high Z
CE LOW to low Z
CE HIGH to high Z
45
45
5
45
20
0
20
0
20
55
55
5
55
20
0
20
0
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes:
1 . Test conditions assume signal transition time of 5ns or less, timing reference levels of V
DD
/2, input pulse levels of 0.5V to V
DD
-0.5V, and output
loading of the specified I
O L
/I
OH
and 50-pF load capacitance.
2. AC test conditions use V
OH
/V
OL
=V
DD
/2 + 500mV.
7