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SN74ALS990 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. SN74ALS990
Description  8-BIT D-TYPE TRANSPARENT READ-BACK LATCH
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN74ALS990
8-BIT D-TYPE TRANSPARENT READ-BACK LATCH
SDAS027B – APRIL 1984 – REVISED JANUARY 1995
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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†
UNIT
()
()
MIN
MAX
tPLH
D
Q
4
17
ns
tPHL
D
Q
5
24
ns
tPLH
LE
Q
6
26
ns
tPHL
LE
Q
8
26
ns
ten‡
OERB
D
4
21
ns
tdis§
OERB
D
4
19
ns
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡ ten = tPZH or tPZL
§ tdis = tPHZ or tPLZ




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