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参数资料
| 型号： | SN54F257FKR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 编、解码器及复用、解复用 |
| 英文描述： | F/FAST SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, CQCC20 |
| 封装： | CERAMIC, LCC-20 |
| 文件页数： | 3/7页 |
| 文件大小： | 145K |
| 代理商： | SN54F257FKR |
SN54F257, SN74F257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDFS065A – D2932, MARCH 1987 – REVISED OCTOBER 1993
2–3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
SN54F257
SN74F257
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
V
VIL
Low-level input voltage
0.8
V
IIK
Input clamp current
–18
mA
IOH
High-level output current
–3
mA
IOL
Low-level output current
20
24
mA
TA
Operating free-air temperature
–55
125
0
70
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54F257
SN74F257
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = – 18 mA
– 1.2
V
VCC =4 5V
IOH = – 1 mA
2.5
3.4
2.5
3.4
VOH
VCC = 4.5 V
IOH = – 3 mA
2.4
3.3
2.4
3.3
V
VCC = 4.75 V,
IOH = – 1 mA to – 3 mA
2.7
VOL
VCC =4 5V
IOL = 20 mA
0.3
0.5
V
VOL
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
V
IOZH
VCC = 5.5 V,
VO = 2.7 V
50
A
IOZL
VCC = 5.5 V,
VO = 0.5 V
–50
A
II
VCC = 5.5 V,
VI = 7 V
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
A
IIL
VCC = 5.5 V,
VI = 0.5 V
– 0.6
mA
IOS
VCC = 5.5 V,
VO = 0
–60
–150
–60
–150
mA
ICCH
V5 5 V
Condition A
9
15
9
15
ICCL
VCC = 5.5 V,
See Note 2
Condition B
14.5
22
14.5
22
mA
ICCZ
See Note 2
Condition C
15
23
15
23
All typical values are at VCC = 5 V, TA = 25°C.
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
NOTE 2: ICC is measured with the outputs open under the following conditions:
A. A/B and all B inputs at 4.5 V, other inputs grounded
B. All B inputs at 4.5 V, other inputs grounded
C. OE and all B data inputs at 4.5 V, other inputs grounded
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