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參數(shù)資料
| 型號(hào)： | SNJ54HCT257J |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/ MULTIPLEXERS WITH 3 STATE OUTPUTS |
| 中文描述： | 四2線1線數(shù)據(jù)選擇器/ 3態(tài)輸出多工器 |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大小： | 267K |
| 代理商： | SNJ54HCT257J |
SCLS072D NOVEMBER 1988 REVISED SEPTEMBER 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) (see Note 1)
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) (see Note 1)
Continuous output current, I
O
(V
O
= 0 to V
CC
)
Continuous current through V
CC
or GND
Package thermal impedance,
θ
JA
(see Note 2): D package
0.5 V to 7 V
±
20 mA
±
20 mA
±
35 mA
±
70 mA
73
°
C/W
67
°
C/W
65
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
NOTES:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 3)
SN54HCT257
MIN
NOM
SN74HCT257
MIN
NOM
UNIT
MAX
MAX
VCC
VIH
VIL
VI
VO
tt
TA
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs
, literature number SCBA004.
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
High-level input voltage
VCC = 4.5 V to 5.5 V
VCC = 4.5 V to 5.5 V
2
2
V
Low-level input voltage
0.8
0.8
V
Input voltage
0
VCC
VCC
500
0
VCC
VCC
500
V
Output voltage
0
0
V
Input transition (rise and fall) time
ns
°
C
Operating free-air temperature
55
125
40
85
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
°
C
TYP
4.499
SN54HCT257
MIN
4.4
SN74HCT257
MIN
4.4
UNIT
MIN
4.4
MAX
MAX
MAX
VOH
VI = VIH or VIL
IOH = 20
μ
A
IOH = 6 mA
IOL = 20
μ
A
IOL = 6 mA
4.5 V
V
3.98
4.3
3.7
3.84
VOL
VI = VIH or VIL
4.5 V
0.001
0.1
0.1
0.1
V
0.17
±
0.1
±
0.01
0.26
±
100
±
0.5
0.4
0.33
±
1000
II
IOZ
ICC
VI = VCC or 0
VO = VCC or 0,
VI = VCC or 0,
One input at 0.5 V or 2.4 V,
Other inputs at 0 or VCC
5.5 V
±
1000
±
10
160
nA
μ
A
μ
A
VI = VIH or VIL
IO = 0
5.5 V
±
5
80
5.5 V
8
ICC
5.5 V
1.4
2.4
3
2.9
mA
Ci
4.5 V
to 5.5 V
3
10
10*
10
pF
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or VCC.
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