STMicroelectronics M74HC251M1R 8-channel multiplexer (3-state) Datasheet

M74HC251
8-CHANNEL MULTIPLEXER (3-STATE)
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HIGH SPEED :
tPD = 17 ns (TYP.) at VCC = 6V
LOW POWER DISSIPATION:
ICC =4µA(MAX.) at TA=25°C
HIGH NOISE IMMUNITY:
VNIH = V NIL = 28 % VCC (MIN.)
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
WIDE OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 251
DESCRIPTION
The M74HC251 is an high speed CMOS
8-CHANNEL
MULTIPLEXER
(3-STATE)
fabricated with silicon gate C2MOS technology.
This Multiplexer features both true (Y) and
complement (W) outputs as well as STROBE
input. When the STROBE is high, both outputs are
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
TUBE
DIP
SOP
TSSOP
M74HC251B1R
M74HC251M1R
T&R
M74HC251RM13TR
M74HC251TTR
in the high impedance state. When enabled,
address information 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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001
1/11
M74HC251
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
4, 3, 2, 1, 15,
14, 13, 12
5
SYMBOL
D0 to D7
Y
6
W
7
STROBE
11, 10, 9
8
16
A, B, C
GND
Vcc
NAME AND FUNCTION
Multiplexer Inputs
Multiplexer Output
Complementary Multiplexer Output
3 State Output Enable
Input
Select Inputs
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
OUTPUTS
STROBE
C
B
A
S
X
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
X
L
H
L
H
L
H
L
H
H
L
L
L
L
L
L
L
L
X : Don’t Care
Z : High Impedance
2/11
Y
W
Z
D0
D1
D2
D3
D4
D5
D6
D7
Z
D0
D1
D2
D3
D4
D5
D6
D7
M74HC251
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Parameter
Supply Voltage
VI
DC Input Voltage
VO
DC Output Voltage
Value
Unit
-0.5 to +7
V
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
V
V
IIK
DC Input Diode Current
± 20
mA
IOK
DC Output Diode Current
± 20
mA
IO
DC Output Current
± 25
mA
± 50
mA
ICC or IGND DC VCC or Ground Current
PD
Power Dissipation
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
500(*)
mW
-65 to +150
°C
300
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
3/11
M74HC251
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Value
Supply Voltage
VI
Input Voltage
VO
Output Voltage
Top
Operating Temperature
Input Rise and Fall Time
tr, tf
Unit
2 to 6
V
0 to VCC
V
0 to VCC
V
-55 to 125
°C
VCC = 2.0V
0 to 1000
ns
VCC = 4.5V
0 to 500
ns
VCC = 6.0V
0 to 400
ns
DC SPECIFICATIONS
Test Condition
Symbol
VIH
VIL
VOH
VOL
II
IOZ
ICC
4/11
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Leakage
Current
High Impedance
Output Leakage
Current
Quiescent Supply
Current
Value
TA = 25°C
VCC
(V)
Min.
2.0
4.5
6.0
2.0
4.5
6.0
Typ.
Max.
1.5
3.15
4.2
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
1.5
3.15
4.2
0.5
1.35
1.8
Max.
1.5
3.15
4.2
0.5
1.35
1.8
Unit
V
0.5
1.35
1.8
2.0
IO=-20 µA
1.9
2.0
1.9
1.9
4.5
IO=-20 µA
4.4
4.5
4.4
4.4
6.0
IO=-20 µA
5.9
6.0
5.9
5.9
4.5
IO=-4.0 mA
4.18
4.31
4.13
4.10
6.0
IO=-5.2 mA
5.68
5.8
5.63
5.60
2.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=20 µA
0.0
0.1
0.1
0.1
V
V
6.0
IO=20 µA
0.0
0.1
0.1
0.1
4.5
IO=4.0 mA
0.17
0.26
0.33
0.40
6.0
IO=5.2 mA
0.18
0.26
0.33
0.40
6.0
VI = VCC or GND
± 0.1
±1
±1
µA
6.0
VI = VIH or VIL
VO = VCC or GND
± 0.5
±5
± 10
µA
6.0
VI = VCC or GND
4
40
80
µA
V
M74HC251
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Symbol
Parameter
tTLH tTHL Output Transition
Time
tPLH tPHL Propagation Delay
Time
(D - Y, W)
tPHL
Propagation Delay
Time
(A, B, C -Y, W)
tPZL tPZH High Impedance
Output Enable
Time
tPLZ tPHZ High Impedance
Output Disable
Time
Value
TA = 25°C
VCC
(V)
Min.
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
RL = 1 KΩ
RL = 1 KΩ
Typ.
Max.
30
8
7
64
16
14
80
20
17
36
11
9
26
13
11
75
15
13
130
26
22
160
32
27
90
18
15
85
17
14
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
95
19
16
165
33
28
200
40
34
115
23
20
105
21
18
Unit
Max.
115
23
20
195
39
33
240
48
41
135
27
23
130
26
22
ns
ns
ns
ns
ns
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
VCC
(V)
Value
TA = 25°C
Min.
Typ.
Max.
10
CIN
Input Capacitance
5.0
5
CPD
Power Dissipation
Capacitance (note
1)
5.0
62
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
10
Unit
Max.
10
pF
pF
1) CPD 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 operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC
5/11
M74HC251
TEST CIRCUIT
TEST
tPLH, tPHL
SWITCH
Open
tPZL, tPLZ
VCC
tPZH, tPHZ
GND
CL = 50pF/150pF or equivalent (includes jig and probe capacitance)
R1 = 1KΩ or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1: PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)
6/11
M74HC251
WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
7/11
M74HC251
Plastic DIP-16 (0.25) MECHANICAL DATA
mm.
inch
DIM.
MIN.
a1
0.51
B
0.77
TYP
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
0.130
1.27
0.050
P001C
8/11
M74HC251
SO-16 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.003
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45° (typ.)
D
9.8
10
0.385
0.393
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
8.89
0.350
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.62
0.024
8° (max.)
PO13H
9/11
M74HC251
TSSOP16 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
TYP.
MAX.
1.2
A1
0.05
A2
0.8
b
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0089
D
4.9
5
5.1
0.193
0.197
0.201
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
1
e
0.65 BSC
K
0°
L
0.45
A
0.60
0.0256 BSC
8°
0°
0.75
0.018
8°
0.024
0.030
A2
A1
b
e
K
c
L
E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
10/11
M74HC251
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consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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11/11
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