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SN74ALS990N Datasheet(PDF) 3 Page - Texas Instruments

Part No. SN74ALS990N
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
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
V
VIH
High-level input voltage
2
V
VIL
Low-level input voltage
0.8
V
IOH
High level output current
Q
– 2.6
mA
IOH
High-level output current
D
– 0.4
mA
IOL
Low level output current
Q
24
mA
IOL
Low-level output current
D
8
mA
tw
Pulse duration, LE high
10
ns
t
Setup time
Data before LE
10
ns
tsu
Setup time
Data before OERB
10
ns
th
Hold time, data after LE
5
ns
TA
Operating free-air temperature
0
70
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
UNIT
VIK
VCC = 4.5 V,
II = – 18 mA
– 1.2
V
V
All outputs
VCC = 4.5 V to 5.5 V,
IOH = – 0.4 mA
VCC –2
V
VOH
Q
VCC = 4.5 V,
IOH = – 2.6 mA
2.4
3.2
V
D
VCC =4 5V
IOL = 4 mA
0.25
0.4
VOL
D
VCC = 4.5 V
IOL = 8 mA
0.35
0.5
V
VOL
Q
VCC =4 5V
IOL = 12 mA
0.25
0.4
V
Q
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
II
OERB, LE
VCC =5 5V
VI = 5.5 V
0.1
mA
II
D inputs
VCC = 5.5 V
VI = 7 V
0.1
mA
I
OERB, LE
VCC =5 5V
VI =2 7V
20
µA
IIH
D inputs‡
VCC = 5.5 V,
VI = 2.7 V
20
µA
IIL
OERB, LE
VCC =5 5V
VI =0 4V
– 0.1
mA
IIL
D inputs‡
VCC = 5.5 V,
VI = 0.4 V
– 0.1
mA
IO§
VCC = 5.5 V,
VO = 2.25 V
–30
–112
mA
ICC
VCC = 5.5 V,
Outputs high
27
50
mA
ICC
CC
OERB high
Outputs low
40
70
mA
† All typical values are at VCC = 5 V, TA = 25°C.
‡ For I/O ports (QA thru QH), the parameters IIH and IIL include the off-state output current.
§ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.




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