SN74ALS666 Datasheet, PDF (6/8 Pages) Texas Instruments – 8-BIT D-TYPE TRANSPARENT READ-BACK LATCHES WITH 3-STATE OUTPUTS

SN74ALS666, SN74ALS667
8-BIT D-TYPE TRANSPARENT READ-BACK LATCHES
WITH 3-STATE OUTPUTS
SDAS227A – JUNE 1984 – REVISED JANUARY 1995
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
TA = MIN to MAX†
SN74ALS666
MIN MAX
tPLH
tPHL
tPLH
tPHL
tPHL
D
LE
CLR
3
14
Q
4
18
6
21
Q
8
27
Q
9
29
D
11
32
tPLH
tPHL
ten‡
PRE
OERB
OE1, OE2
Q
7
22
D
9
28
D
4
21
Q
4
21
tdis§
OERB
OE1, OE2
D
1
14
Q
1
14
† _{For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.}
‡ _{ten = tPZH or tPZL}
§ _{tdis = tPHZ or tPLZ}
UNIT
ns
ns
ns
ns
ns
ns
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
TA = MIN to MAX†
SN74ALS667
MIN MAX
tPLH
tPHL
tPLH
tPHL
tPHL
D
LE
CLR
6
20
Q
4
15
9
28
Q
7
22
Q
7
24
D
8
26
tPLH
tPHL
PRE
Q
8
25
D
9
28
OERB
ten‡
OE1, OE2
D
4
21
Q
4
21
tdis§
OERB
OE1, OE2
D
1
14
Q
1
14
† _{For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.}
‡ _{ten = tPZH or tPZL}
§ _{tdis = tPHZ or tPLZ}
UNIT
ns
ns
ns
ns
ns
ns
6
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