Philips Semiconductors
Product specification
1-of-8 decoder (3-State)
74F538
DESCRIPTION
The 74F538 decoder/demultiplexer accepts three address (A0 - A2)
input signals and decodes them to select one of eight mutually
exclusive outputs. A Polarity control (P) input determines whether
the outputs are active Low or active High. The 74F538 has 3-State
outputs, and a High signal on the Output Enables (OEn) inputs will
force all outputs to the high impedance state. Two active High (E2,
E3) and two active Low (E0, E1) inputs are available for easy
expansion to 1-of-32 decoding with four packages, or for data
demultiplexing to 1-of-8 or 1-of-16 destinations.
TYPICAL SUPPLY
CURRENT
(TOTAL)
35mA
PIN CONFIGURATION
Q2
Q1
Q0
OE0
OE1
A0
1
2
3
4
5
6
7
8
9
20 V
CC
19 Q3
18 Q4
17 A2
16 E0
15 E1
14 E2
13 E3
12 P
11 Q7
TYPE
74F538
TYPICAL
PROPAGATION DELAY
8.5ns
A1
Q5
Q6
GND 10
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic DIP
20-Pin Plastic SOL
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
N74F538N
N74F538D
PKG DWG #
SOT146-1
SOT163-1
SF00996
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
A0 - A2
E0, E1
E2, E3
P
OE0, OE1
Q0 - Q7
Address inputs
Enable inputs (active Low)
Enable inputs (active High)
Polarity control input
Output Enable inputs
Data outputs
DESCRIPTION
74F(U.L.)
HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
150/40
LOAD VALUE
HIGH/LOW
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
3.0mA/24mA
NOTE:
One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
6
7
17
LOGIC SYMBOL (IEEE/IEC)
DMUX
4
A0
A1
A2
5
6
7
17
N8
&
EN
3
0,8
1,8
0
2
G
0
7
2,8
3,8
4,8
13
Q1
Q2
Q3
Q4 Q5
Q6
Q7
14
15
16
&
5,8
6,8
7,8
2
1
19
18
8
9
11
12
16
15
14
13
4
5
P
E0
E1
E2
E3
OE0
OE1
Q0
V
CC
= Pin 20
GND = Pin 10
3
2
1
19
18
8
9
11
SF00997
SF00998
1989 Apr 06
2
853–1273 96267
Philips Semiconductors
Product specification
1-of-8 decoder (3-State)
74F538
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5.0
–0.5 to +V
CC
48
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
CC
V
IH
V
IL
I
IK
I
OH
I
OL
T
amb
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature range
0
PARAMETER
LIMITS
MIN
4.5
2.0
0.8
–18
–3.0
24
70
NOM
5.0
MAX
5.5
UNIT
V
V
V
mA
mA
mA
°C
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
V
OH
V
O
OL
V
IK
I
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
PARAMETER
High-level
High level output voltage
TEST CONDITIONS
1
V
CC
= MIN, V
IL
= MAX,
V
IH
= MIN, I
OH
= MAX
V
CC
= MIN, V
IL
= MAX,
V
IH
= MIN, I
OL
= MAX
V
CC
= MIN, I
I
= I
IK
V
CC
= MAX, V
I
= 7.0V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.5V
V
CC
= MAX, V
O
= 2.7V
V
CC
= MAX, V
O
= 0.5V
V
CC
= MAX
I
CCH
I
CC
Supply current
I
CCL
I
CCZ
V
CC
= MAX
–60
30
35
35
±10%V
CC
±5%V
CC
±10%V
CC
±5%V
CC
LIMITS
MIN
2.4
2.7
3.3
0.35
0.35
–0.73
0.50
0.50
–1.2
100
20
–0.6
50
–50
–150
40
50
50
TYP
2
MAX
UNIT
V
V
V
V
V
µA
µA
mA
µA
µA
mA
mA
mA
mA
Low level output voltage
Low-level
Input clamp voltage
Input current at maximum input
voltage
High-level input current
Low-level input current
Off-state output current
High-level voltage applied
Off-state output current
Low-level voltage applied
Short-circuit output current
3
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value under the recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25°C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
OS
should be performed last.
1989 Apr 06
4
Philips Semiconductors
Product specification
1-of-8 decoder (3-State)
74F538
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
T
amb
= +25°C
V
CC
= +5.0V
C
L
= 50pF, R
L
= 500Ω
MIN
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation delay
An to Qn
Propagation delay
E0 or E1 to Qn
Propagation delay
E2 or E3 to Qn
Propagation delay
P to Qn
Output Enable time
OE0 or OE1 to Qn
Output Disable time
OE0 or OE1 to Qn
Waveform 1, 2
Waveform 1, 2
Waveform 1, 2
Waveform 1, 2
Waveform 3
Waveform 4
Waveform 3
Waveform 4
5.5
3.0
5.5
3.0
6.5
4.0
4.5
3.5
2.5
6.5
1.0
1.0
TYP
8.5
7.5
8.5
7.5
9.0
7.0
9.5
6.5
5.5
9.5
3.0
3.5
MAX
13.0
12.5
12.0
12.0
12.5
12.5
15.0
10.0
9.5
13.5
6.0
8.5
T
amb
= 0°C to +70°C
V
CC
= +5.0V
±
10%
C
L
= 50pF, R
L
= 500Ω
MIN
5.0
3.0
5.0
3.0
5.5
3.5
4.0
3.5
2.0
6.0
1.0
1.0
MAX
14.0
13.5
13.0
12.5
13.5
13.0
16.5
10.5
11.0
15.0
7.0
9.5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
UNIT
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
An, P, En, En
V
M
t
PLH
V
M
t
PHL
V
M
V
M
An, P, En, En
V
M
t
PHL
V
M
t
PLH
V
M
V
M
Qn
Qn
SF01000
SF01001
Waveform 1. Propagation Delay for
Non-Inverting Outputs
Waveform 2. Propagation Delay for
Inverting Outputs
OEn
V
M
t
PZH
V
M
t
PHZ
V
M
0V
V
OH
-0.3V
OEn
V
M
t
PZL
V
M
t
PLZ
V
M
V
OL
+0.3V
Qn
Qn
SF01002
SF01003
Waveform 3. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
Waveform 4. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
1989 Apr 06
5
测试/测量
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