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Электронный компонент: M74HC251B1R

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M54HC251
M74HC251
February 1993
8 BIT SIPO SHIFT REGISTER
B1R
(Plastic Package)
ORDER CODES :
M54HC251F1R
M74HC251M1R
M74HC251B1R
M74HC251C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
.
HIGH SPEED
t
PD
= 14 ns (TYP.) AT V
CC
= 5 V
.
LOW POWER DISSIPATION
I
CC
= 4
A (MAX.) AT T
A
= 25
C 6 V
.
HIGH NOISE IMMUNITY
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
IOH
= I
OL
= 4 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
.
WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V TO 6 V
.
PIN AND FUNCTION COMPATIBLE WITH
54/74LS251
DESCRIPTION
The M54/74HC251 is a high speed CMOS 8-CHAN-
NEL MULTIPLEXER (3-STATE) fabricated in silicon
gate C
2
MOS technology. It has the same high
speed performance of LSTTL combined with true
CMOS low power consumption. This multiplexer
features both true (Y) and complement (W) outputs
as well as STROBE input. The STROBE must be a
low logic level to enable this device. When the
STROBE input is high, both outputs are in the high
impedance state. When enabled, address informa-
tion on the data select inputs determines which data
input is routed to Y and W. All inputs are equipped
with protection circuits against static discharge and
transient excess voltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
1/11
TRUTH TABLE
INPUTS
OUTPUS
STROBE
Y
W
C
B
A
S
X
X
X
H
Z
Z
L
L
L
L
D0
D0
L
L
H
L
D1
D1
L
H
L
L
D2
D2
L
H
H
L
D3
D3
H
L
L
L
D4
D4
H
L
H
L
D5
D5
H
H
L
L
D6
D6
H
H
H
L
D7
D7
X: Don't Care Z: HIGH Impedance
LOGIC DIAGRAM
M54/M74HC251
2/11
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
4, 3, 2, 1,
15, 14, 13,
12
D0 to D7
Multiplexer Inputs
5
Y
Multiplexer Output
6
W
Complementary
Multiplexer Output
7
STROBE
3 State Output Enable
Input
11, 10, 9
A, B, C
Select Inputs
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
IEC LOGIC SYMBOL
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Source Sink Current Per Output Pin
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
P
D
Power Dissipation
500 (*)
mW
T
stg
Storage Temperature
-65 to +150
o
C
T
L
Lead Temperature (10 sec)
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
(*) 500 mW:
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2 to 6
V
V
I
Input Voltage
0 to V
CC
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
o
C
o
C
t
r
, t
f
Input Rise and Fall Time
V
CC
= 2 V
0 to 1000
ns
V
CC
= 4.5 V
0 to 500
V
CC
= 6 V
0 to 400
M54/M74HC251
3/11
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
Value
Unit
V
CC
(V)
T
A
= 25
o
C
54HC and 74HC
-40 to 85
o
C
74HC
-55 to 125
o
C
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
2.0
1.5
1.5
1.5
V
4.5
3.15
3.15
3.15
6.0
4.2
4.2
4.2
V
IL
Low Level Input
Voltage
2.0
0.5
0.5
0.5
V
4.5
1.35
1.35
1.35
6.0
1.8
1.8
1.8
V
OH
High Level
Output Voltage
2.0
V
I
=
V
IH
or
V
IL
I
O
=-20
A
1.9
2.0
1.9
1.9
V
4.5
4.4
4.5
4.4
4.4
6.0
5.9
6.0
5.9
5.9
4.5
I
O
=-4.0 mA
4.18
4.31
4.13
4.10
6.0
I
O
=-5.2 mA
5.68
5.8
5.63
5.60
V
OL
Low Level Output
Voltage
2.0
V
I
=
V
IH
or
V
IL
I
O
= 20
A
0.0
0.1
0.1
0.1
V
4.5
0.0
0.1
0.1
0.1
6.0
0.0
0.1
0.1
0.1
4.5
I
O
= 4.0 mA
0.17
0.26
0.33
0.40
6.0
I
O
= 5.2 mA
0.18
0.26
0.33
0.40
I
I
Input Leakage
Current
6.0
V
I
= V
CC
or GND
0.1
1
1
A
I
OZ
3 State Output
Off State Current
6.0
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
0.5
5.0
10
A
I
CC
Quiescent Supply
Current
6.0
V
I
= V
CC
or GND
4
40
80
A
M54/M74HC251
4/11
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Symbol
Parameter
Test Conditions
Value
Unit
V
CC
(V)
T
A
= 25
o
C
54HC and 74HC
-40 to 85
o
C
74HC
-55 to 125
o
C
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
TLH
t
THL
Output Transition
Time
2.0
30
75
95
110
ns
4.5
8
15
19
22
6.0
7
13
16
19
t
PLH
t
PHL
Propagation
Delay Time
(D - Y, W)
2.0
64
130
165
195
ns
4.5
16
26
33
39
6.0
14
22
28
33
t
PLH
t
PHL
Propagation
Delay Time
(A, B, C - Y, W)
2.0
80
160
200
240
ns
4.5
20
32
40
48
6.0
17
27
34
41
t
PZL
t
PZH
Output Enable
Time
2.0
R
L
= 1 K
36
90
115
135
ns
4.5
11
18
23
27
6.0
9
15
20
23
t
PLZ
t
PHZ
Output Disable
Time
2.0
R
L
= 1 K
26
85
105
130
ns
4.5
13
17
21
26
6.0
11
14
18
22
C
IN
Input Capacitance
5
10
10
10
pF
C
PD
(*)
Power Dissipation
Capacitance
62
pF
(*) C
PD
is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load.
(Refer to Test Circuit). Average operting current can be obtained by the following equation. I
CC
(opr) = C
PD
V
CC
f
IN
+ I
CC
TEST WAVEFORM I
CC
(Opr.)
* INPUT WAVEFORM TIME IS THE SAME AS THAT IN CASE OF SWITCHING CHARACTERISTICS TEST.
M54/M74HC251
5/11