SN54147_07 Datasheet, PDF (9/24 Pages) Texas Instruments – 10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS

SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10ĆLINE TO 4ĆLINE AND 8ĆLINE TO 3ĆLINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
SN54148, SN74148 switching characteristics, V_CC = 5 V, T_A = 255C (see Figure 1)
PARAMETER†
FROM
(INPUT)
TO
(OUTPUT)
WAVEFORM
TEST
CONDITIONS
MIN TYP
tPLH
10
1–7
A0, A1, or A2 In-phase output
tPHL
9
tPLH
13
1–7
A0, A1, or A2 Out-of-phase output
tPHL
12
tPLH
6
0–7
EO
Out-of-phase output
tPHL
14
tPLH
0–7
tPHL
GS
In-phase output
CL = 15 pF,
RL = 400 Ω
18
14
tPLH
10
EI
A0, A1, or A2 In-phase output
tPHL
10
tPLH
8
EI
GS
In-phase output
tPHL
10
tPLH
EI
EO
In-phase output
10
tPHL
17
† _{tPLH = propagation delay time, low-to-high-level output.}
tPHL = propagation delay time, high-to-low-level output.
MAX
15
14
19
19
10
25
30
25
15
15
12
15
15
30
UNIT
ns
ns
ns
ns
ns
ns
ns
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS†
SN54LS’
SN74LS’
MIN TYP‡ MAX MIN TYP‡ MAX ^UNIT
VIH
VIL
VIK
VOH
High-level input voltage
Low-level input voltage
Input clamp voltage
High-level output voltage
VCC = MIN,
VCC = MIN,
VIL = 0.8 V,
2
2
V
0.7
0.8 V
II = −18 mA
−1.5
−1.5 V
VIH = 2 V,
IOH = −400 µA
2.5
3.4
2.7 3.4
V
VOL Low-level output voltage
VCC = MIN,
VIH = 2 V,
VIL = VIL MAX
IOL = 4 mA
IOL = 8 mA
0.25 0.4
0.25 0.4
V
0.35 0.5
Input current at _{’LS148 inputs 1–7}
II
maximum input
VCC = MAX,
VI = 7 V
voltage
All other inputs
0.2
0.2
mA
0.1
0.1
High-level input ^{’LS148 inputs 1–7}
IIH
current
All other inputs
VCC = MAX,
VI = 2.7 V
40
40
µA
20
20
Low-level input ^{’LS148 inputs 1–7}
IIL
current
All other inputs
VCC = MAX,
VI = 0.4 V
−0.8
−0.8
mA
−0.4
−0.4
IOS Short-circuit output current§
VCC = MAX
−20
−100 −20
−100 mA
ICC Supply current
VCC = MAX
(See Note 6)
Condition 1
Condition 2
12 20
10 17
12 20
mA
10 17
† _{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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