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| 型號(hào)： | 74LS147 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS |
| 中文描述： | 10線的4線和8線三線優(yōu)先編碼器 |
| 文件頁(yè)數(shù)： | 9/22頁(yè) |
| 文件大?。?/td> | 623K |
| 代理商： | 74LS147 |
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SDLS053B OCTOBER 1976 REVISED MAY 2004
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
SN54148, SN74148 switching characteristics, V
CC
= 5 V, T
A
= 25 C (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
WAVEFORM
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
1–7
A0, A1, or A2
In-phase output
10
15
ns
9
14
1–7
A0, A1, or A2
Out-of-phase output
13
19
ns
12
19
0–7
EO
Out-of-phase output
6
10
ns
14
25
0–7
GS
In-phase output
CL = 15 pF,
RL = 400
18
30
ns
14
25
EI
A0, A1, or A2
In-phase output
10
15
ns
10
15
EI
GS
In-phase output
8
12
ns
10
15
EI
EO
In-phase output
10
17
15
30
ns
tPLH = propagation delay time, low-to-high-level output.
tPHL = propagation delay time, high-to-low-level output.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54LS’
TYP
SN74LS’
TYP
UNIT
MIN
MAX
MIN
MAX
VIH
VIL
VIK
High-level input voltage
2
2
V
Low-level input voltage
0.7
0.8
V
Input clamp voltage
VCC = MIN,
VCC = MIN,
VIL = 0.8 V,
VCC
VIH = 2 V,
VIL = VIL MAX
II = 18 mA
VIH = 2 V,
IOH = 400
μ
A
1.5
1.5
V
VOH
High-level output voltage
2.5
3.4
2.7
3.4
V
VOL
Low-level output voltage
IOL = 4 mA
0.25
0.4
0.25
0.4
V
IOL = 8 mA
0.35
0.5
II
Input current at
maximum input
voltage
’LS148 inputs 1–7
VCC = MAX,
VI = 7 V
0.2
0.2
mA
All other inputs
0.1
0.1
IIH
High-level input
current
’LS148 inputs 1–7
VCC = MAX,
VI = 2.7 V
40
40
All other inputs
20
20
μ
A
IIL
Low-level input
current
Short-circuit output current§
’LS148 inputs 1–7
VCC = MAX,
VI = 0.4 V
0.8
0.8
mA
All other inputs
0.4
0.4
IOS
VCC = MAX
VCC = MAX
(See Note 6)
20
100
20
100
mA
ICC
Supply current
Condition 1
Condition 2
12
10
20
17
12
10
20
17
mA
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
All typical values are at VCC = 5 V, TA = 25
°
C.
§Not more than one output should be shorted at a time.
NOTE 6: For ’LS147, ICC (Condition 1) is measured with input 7 grounded, other inputs and outputs open; ICC (Condition 2) is measured with
all inputs and outputs open. For ’LS148, ICC (Condition 1) is measured with inputs 7 and EI grounded, other inputs and outputs open;
ICC (Condition 2) is measured with all inputs and outputs open.
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