Fairchild MM74HC251MTC 8-channel 3-state multiplexer Datasheet

Revised February 1999
MM74HC251
8-Channel 3-STATE Multiplexer
General Description
The MM74HC251 8-channel digital multiplexer with 3STATE outputs utilizes advanced silicon-gate CMOS technology. Along with the high noise immunity and low power
consumption of standard CMOS integrated circuits, it possesses the ability to drive 10 LS-TTL loads. The large output drive capability and 3-STATE feature make this part
ideally suited for interfacing with bus lines in a bus oriented
system.
This multiplexer features both true (Y) and complement
(W) outputs as well as a STROBE input. The STROBE
must be at 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 information on
the data select inputs determines which data input is routed
to the Y and W outputs. The 74HC logic family is speed,
function, as well as pinout compatible with the standard
74LS logic family. All inputs are protected from damage
due to static discharge by internal diode clamps to VCC and
ground.
Features
■ Typical propagation delay
Data select to Y: 26 ns
■ Wide supply range: 2–6V
■ Low power supply quiescent current:
80 µA maximum (74HC)
■ 3-STATE outputs for interface to bus oriented
systems
Ordering Code:
Order Number
MM74HC251M
MM74HC251SJ
MM74HC251MTC
MM74HC251N
Package Number
Package Description
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MTC16
N16E
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Pin Assignments for DIP, SOIC, SOP and TSSOP
Top View
© 1999 Fairchild Semiconductor Corporation
DS005328.prf
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MM74HC251 8-Channel 3-STATE Multiplexer
September 1983
MM74HC251
Truth Table
Inputs
Select
Outputs
Strobe
W
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
H = HIGH Logic Level, L = LOW Logic Level
X = Irrelevant, Z = High Impedance (off)
D0, D1. . . D7 = The level of the respective D input
Logic Diagram
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Y
C
2
Recommended Operating
Conditions
−0.5 to +7.0V
Supply Voltage (VCC)
DC Input Voltage (VIN)
−1.5 to VCC +1.5V
DC Output Voltage (VOUT)
−0.5 to VCC +0.5V
Clamp Diode Current (IIK, IOK)
±20 mA
DC Output Current, per pin (IOUT)
±25 mA
Max
Units
2
6
V
0
VCC
V
−40
+85
°C
(tr, tf) VCC = 2.0V
1000
ns
VCC = 4.5V
500
ns
VCC = 6.0V
400
ns
DC Input or Output Voltage
(VIN, VOUT)
Operating Temperature Range (TA)
±50 mA
DC VCC or GND Current, per pin (ICC)
Storage Temperature Range (TSTG)
Min
Supply Voltage (VCC)
Input Rise or Fall Times
−65°C to +150°C
Power Dissipation (PD)
(Note 3)
600 mW
S.O. Package only
500 mW
Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Lead Temperature (TL)
(Soldering 10 seconds)
DC Electrical Characteristics
Symbol
VIH
VIL
VOH
Parameter
Note 2: Unless otherwise specified all voltages are referenced to ground.
260°C
Note 3: Power Dissipation temperature derating — plastic “N” package: −
12 mW/°C from 65°C to 85°C.
(Note 4)
Conditions
VCC
TA = 25°C
Typ
TA = −40 to 85°C TA = −55 to 125°C
Guaranteed Limits
Units
Minimum HIGH Level
2.0V
1.5
1.5
1.5
V
Input Voltage
4.5V
3.15
3.15
3.15
V
6.0V
4.2
4.2
4.2
V
Maximum LOW Level
2.0V
0.5
0.5
0.5
V
Input Voltage
4.5V
1.35
1.35
1.35
V
6.0V
1.8
1.8
1.8
V
Minimum HIGH Level
VIN = VIH or VIL
Output Voltage
|IOUT| ≤ 20 µA
2.0V
2.0
1.9
1.9
1.9
V
4.5V
4.5
4.4
4.4
4.4
V
6.0V
6.0
5.9
5.9
5.9
V
|IOUT| ≤ 4.0 mA
4.5V
4.2
3.98
3.84
3.7
V
|IOUT| ≤ 5.2 mA
6.0V
5.7
5.48
5.34
5.2
V
VIN = VIH or VIL
VOL
Maximum LOW Level
VIN = VIH or VIL
Output Voltage
|IOUT| ≤ 20 µA
2.0V
0
0.1
0.1
0.1
V
4.5V
0
0.1
0.1
0.1
V
6.0V
0
0.1
0.1
0.1
V
|IOUT| ≤ 4.0 mA
4.5V
0.2
0.26
0.33
0.4
V
|IOUT| ≤ 5.2 mA
6.0V
0.2
0.26
0.33
0.4
V
VIN = VCC or GND
6.0V
±0.1
±1.0
±1.0
µA
6.0V
±0.5
±5
±10
µA
6.0V
8.0
80
160
µA
VIN = VIH or VIL
IIN
Maximum Input
IOZ
Maximum 3-STATE
Strobe = VCC
Leakage Current
VOUT = VCC or GND
Current
ICC
Maximum Quiescent
VIN = VCC or GND
Supply Current
IOUT = 0 µA
Note 4: For a power supply of 5V ±10% the worst case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when
designing with this supply. Worst case VIH and VIL occur at VCC = 5.5V and 4.5V respectively. (The VIH value at 5.5V is 3.85V.) The worst case leakage current (IIN, ICC, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used.
3
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MM74HC251
Absolute Maximum Ratings(Note 1)
(Note 2)
MM74HC251
AC Electrical Characteristics
VCC = 5V, TA = 25°C, CL = 15 pF, tr = tf = 6 ns
Symbol
tPHL, tPLH
Parameter
Conditions
Guaranteed
Typ
Maximum Propagation Delay
Units
Limit
26
35
ns
27
35
ns
22
29
ns
24
32
ns
19
27
ns
19
26
ns
26
40
ns
27
35
ns
A, B or C to Y
tPHL, tPLH
Maximum Propagation
Delay, A, B or C to W
tPHL, tPLH
Maximum Propagation
Delay, Any D to Y
tPHL, tPLH
Maximum Propagation
Delay, Any D to W
tPZH, tPZL
tPZH, tPZL
tPHZ, tPLZ
tPHZ, tPLZ
Maximum Output Enable
RL = 1 kΩ
Time, W Output
CL = 50 pF
Maximum Output Enable
RL = 1 kΩ
Time, Y Output
CL = 50 pF
Maximum Output Disable Time
RL = 1 kΩ
W Output
CL = 5 pF
Maximum Output Disable Time
RL = 1 kΩ
Y Output
CL = 5 pF
AC Electrical Characteristics
CL = 50 pF, tr = tf = 6 ns (unless otherwise specified)
Symbol
Parameter
Conditions
tPHL, tPLH Maximum Propagation Delay
A, B or C to Y
tPHL, tPLH Maximum Propagation
Delay, A, B or C to W
tPHL, tPLH Maximum Propagation
Delay, any D to Y
tPHL, tPLH Maximum Propagation
Delay, any D to W
tPZH, tPZL Maximum Output Enable Time
RL = 1 kΩ
W Output
tPZH, tPZL Maximum Output Enable Time
RL = 1 kΩ
Y Output
tPHZ, tPLZ Maximum Output Disable Time
RL = 1 kΩ
W Output
tPHZ, tPLZ Maximum Output Disable Time
RL = 1 kΩ
Y Output
tTHL, tTLH Maximum Output Rise
and Fall Time
CPD
Power Dissipation Capacitance (Note 5) (per package)
CIN
Maximum Input Capacitance
VCC
TA = 25°C
Typ
TA = −40 to 85°C TA = −55 to 125°C
90
205
256
300
ns
4.5V
31
41
51
60
ns
6.0V
26
35
44
51
ns
2.0V
95
205
256
300
ns
4.5V
32
41
51
60
ns
6.0V
27
35
44
51
ns
2.0V
70
195
244
283
ns
4.5V
27
39
49
57
ns
6.0V
23
33
41
48
ns
2.0V
75
185
231
268
ns
4.5V
29
37
46
54
ns
6.0V
25
32
40
46
ns
2.0V
45
150
188
218
ns
4.5V
21
30
38
44
ns
6.0V
18
26
33
38
ns
2.0V
45
145
181
210
ns
4.5V
21
29
36
42
ns
6.0V
18
25
31
36
ns
2.0V
60
220
275
319
ns
4.5V
29
44
55
64
ns
6.0V
25
37
46
54
ns
2.0V
60
195
244
283
ns
4.5V
30
39
49
57
ns
6.0V
26
33
41
48
ns
ns
2.0V
30
75
95
110
4.5V
8
15
19
22
ns
6.0V
7
13
16
19
ns
10
10
10
110
5
pF
Note 5: CPD determines the no load dynamic power consumption, PD = CPD VCC2 f + ICC VCC, and the no load dynamic current consumption,
IS = CPD VCC f + ICC.
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Units
Guaranteed Limits
2.0V
4
pF
MM74HC251
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
Package Number M16A
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
5
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MM74HC251
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
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6
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Package Number N16A
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
1. Life support devices or systems are devices or systems
device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the
sonably expected to cause the failure of the life support
body, or (b) support or sustain life, and (c) whose failure
device or system, or to affect its safety or effectiveness.
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
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user.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
MM74HC251 8-Channel 3-STATE Multiplexer
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
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