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SN74ALS845-1NT 数据表(PDF) 3 Page - Texas Instruments

部件名 SN74ALS845-1NT
功能描述  8-BIT BUS-INTERFACE D-TYPE LATCH WITH 3-STATE OUTPUTS
Download  9 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74ALS845-1NT 数据表(HTML) 3 Page - Texas Instruments

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SN74ALS845
8BIT BUSINTERFACE DTYPE LATCH
WITH 3STATE OUTPUTS
SDAS233A − DECEMBER 1983 − REVISED JANUARY 1995
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA
0
°C to 70°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
−65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
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
− 2.6
mA
IOL
Low-level output current
24
mA
IOL
Low-level output current
48‡
mA
tw
Pulse duration
CLR or PRE low
35
ns
tw
Pulse duration
LE high
20
ns
tsu
Setup time, data before LE
10
ns
th
Hold time, data after LE
5
ns
TA
Operating free-air temperature
0
70
°C
‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
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
VOH
VCC = 4.5 V to 5.5 V,
IOH = − 0.4 mA
VCC −2
V
VOH
VCC = 4.5 V,
IOH = − 2.6 mA
2.4
3.2
V
IOL = 12 mA
0.25
0.4
VOL
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
V
VOL
VCC = 4.5 V
IOL = 48 mA‡
0.35
0.5
V
IOZH
VCC = 5.5 V,
VO = 2.7 V
20
µA
IOZL
VCC = 5.5 V,
VO = 0.4 V
−20
µA
II
VCC = 5.5 V,
VI = 7 V
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
µA
IIL
VCC = 5.5 V,
VI = 0.4 V
− 0.1
mA
IO¶
VCC = 5.5 V,
VO = 2.25 V
−30
−112
mA
Outputs high
21
36
ICC
VCC = 5.5 V
Outputs low
41
67
mA
ICC
VCC = 5.5 V
Outputs disabled
25
42
mA
‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
§ All typical values are at VCC = 5 V, TA = 25°C.
¶ 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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