MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1
REV 6
Motorola, Inc. 1995
10/95
Quad 2-Input Data
Selector/Multiplexer with
3-State Outputs
HighPerformance SiliconGate CMOS
The MC74HC257 is identical in pinout to the LS257. The device inputs are
compatible with standard CMOS outputs; with pullup resistors, they are
compatible with LSTTL outputs.
This device selects a (4bit) nibble from either the A or B inputs as
determined by the Select input. The nibble is presented at the outputs in
noninverted form when the Output Enable pin is at a low level. A high level on
the Output Enable pin switches the outputs into the highimpedance state.
The HC257 is similar in function to the HC157 which do not have 3state
outputs.
Output Drive Capability: 15 LSTTL Loads
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2 to 6 V
Low Input Current: 1
A
High Noise Immunity Characteristic of CMOS Devices
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
Chip Complexity: 108 FETs or 27 Equivalent Gates
LOGIC DIAGRAM
2
5
11
14
3
6
10
13
4
7
9
12
1
15
A0
A1
A2
A3
B0
B1
B2
B3
Y0
Y1
Y2
Y3
SELECT
OUTPUT
ENABLE
NONINVERTING
NIBBLE
OUTPUT
NIBBLE
A INPUT
NIBBLE
B INPUT
PIN 16 = VCC
PIN 8 = GND
MC74HC257
PIN ASSIGNMENT
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
Y3
B3
A3
OUTPUT
ENABLE
VCC
Y2
B2
A2
Y0
B0
A0
SELECT
GND
Y1
B1
A1
FUNCTION TABLE
Inputs
Outputs
Output
Enable
Select
Y0 Y3
H
X
Z
L
L
A0 A3
L
H
B0 B3
X = don't care
Z = high impedance
A0 A3, B0 B3 = the levels of the
respective Nibble Inputs.
D SUFFIX
SOIC PACKAGE
CASE 751B05
N SUFFIX
PLASTIC PACKAGE
CASE 64808
1
16
1
16
ORDERING INFORMATION
MC74HCXXXN
MC74HCXXXD
Plastic
SOIC
MC74HC257
MOTOROLA
HighSpeed CMOS Logic Data
DL129 -- Rev 6
2
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
DC Supply Voltage (Referenced to GND)
0.5 to + 7.0
V
Vin
DC Input Voltage (Referenced to GND)
1.5 to VCC + 1.5
V
Vout
DC Output Voltage (Referenced to GND)
0.5 to VCC + 0.5
V
Iin
DC Input Current, per Pin
20
mA
Iout
DC Output Current, per Pin
35
mA
ICC
DC Supply Current, VCC and GND Pins
75
mA
PD
Power Dissipation in Still Air
Plastic DIP
SOIC Package
750
500
mW
Tstg
Storage Temperature
65 to + 150
_
C
TL
Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
260
_
C
* Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
Derating -- Plastic DIP: 10 mW/
_
C from 65
_
to 125
_
C
SOIC Package: 7 mW/
_
C from 65
_
to 125
_
C
For high frequency or heavy load considerations, see Chapter 2 of the Motorola HighSpeed CMOS Data Book (DL129/D).
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
VCC
DC Supply Voltage (Referenced to GND)
2.0
6.0
V
Vin, Vout
DC Input Voltage, Output Voltage (Referenced to GND)
0
VCC
V
TA
Operating Temperature, All Package Types
55
+ 125
_
C
tr, tf
Input Rise and Fall Time
VCC = 2.0 V
(Figure 1)
VCC = 4.5 V
VCC = 6.0 V
0
0
0
1000
500
400
ns
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
Symbol
Parameter
Test Conditions
VCC
V
Guaranteed Limit
Unit
Symbol
Parameter
Test Conditions
VCC
V
55 to
25
_
C
v
85
_
C
v
125
_
C
Unit
VIH
Minimum HighLevel Input
Voltage
Vout = 0.1 V or VCC 0.1 V
|Iout|
v
20
A
2.0
4.5
6.0
1.5
3.15
4.2
1.5
3.15
4.2
1.5
3.15
4.2
V
VIL
Maximum LowLevel Input
Voltage
Vout = 0.1 V or VCC 0.1 V
|Iout|
v
20
A
2.0
4.5
6.0
0.3
0.9
1.2
0.3
0.9
1.2
0.3
0.9
1.2
V
VOH
Minimum HighLevel Output
Voltage
Vin = VIH or VIL
|Iout|
v
20
A
2.0
4.5
6.0
1.9
4.4
5.9
1.9
4.4
5.9
1.9
4.4
5.9
V
Vin = VIH or VIL |Iout|
v
6.0 mA
|Iout|
v
7.8 mA
4.5
6.0
3.98
5.48
3.84
5.34
3.70
5.20
VOL
Maximum LowLevel Output
Voltage
Vin = VIH or VIL
|Iout|
v
20
A
2.0
4.5
6.0
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
V
Vin = VIH or VIL |Iout|
v
6.0 mA
|Iout|
v
7.8 mA
4.5
6.0
0.26
0.26
0.33
0.33
0.40
0.40
Iin
Maximum Input Leakage Current
Vin = VCC or GND
6.0
0.1
1.0
1.0
A
IOZ
Maximum ThreeState
Leakage Current
Output in HighImpedance State
Vin = VIL or VIH
Vout = VCC or GND
6.0
0.5
5.0
10
A
ICC
Maximum Quiescent Supply
Current (per Package)
Vin = VCC or GND
Iout = 0
A
6.0
8
80
160
A
NOTE: Information on typical parametric values can be found in Chapter 2 of the Motorola HighSpeed CMOS Data Book (DL129/D).
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this highimpedance cir-
cuit. For proper operation, Vin and
Vout should be constrained to the
range GND
v
(Vin or Vout)
v
VCC.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or VCC).
Unused outputs must be left open.
MC74HC257
HighSpeed CMOS Logic Data
DL129 -- Rev 6
3
MOTOROLA
AC ELECTRICAL CHARACTERISTICS
(CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
VCC
V
Guaranteed Limit
Unit
Symbol
Parameter
VCC
V
55 to
25
_
C
v
85
_
C
v
125
_
C
Unit
tPLH,
tPHL
Maximum Propagation Delay, Nibble A or B to Output Y
(Figures 1 and 4)
2.0
4.5
6.0
100
20
17
125
25
21
150
30
26
ns
tPLH,
tPHL
Maximum Propagation Delay, Select to Output Y
(Figures 2 and 4)
2.0
4.5
6.0
100
20
17
125
25
21
150
30
26
ns
tPLZ,
tPHZ
Maximum Propagation Delay, Output Enable to Output Y
(Figures 3 and 5)
2.0
4.5
6.0
150
30
26
190
38
33
225
45
38
ns
tPZL,
tPZH
Maximum Propagation Delay, Output Enable to Output Y
(Figures 3 and 5)
2.0
4.5
6.0
150
30
26
190
38
33
225
45
38
ns
tTLH,
tTHL
Maximum Output Transition Time, Any Output
(Figures 1 and 4)
2.0
4.5
6.0
60
12
10
75
15
13
90
18
15
ns
Cin
Maximum Input Capacitance
--
10
10
10
pF
Cout
Maximum ThreeState Output Capacitance
(Output in HighImpedance
State)
--
15
15
15
pF
NOTES:
1. For propagation delays with loads other than 50 pF, see Chapter 2 of the Motorola HighSpeed CMOS Data Book (DL129/D).
2. Information on typical parametric values can be found in Chapter 2 of the Motorola HighSpeed CMOS Data Book (DL129/D).
CPD
Power Dissipation Capacitance (Per Package)*
Typical @ 25
C, VCC = 5.0 V
pF
CPD
Power Dissipation Capacitance (Per Package)*
39
pF
* Used to determine the noload dynamic power consumption: PD = CPD VCC2f + ICC VCC. For load considerations, see Chapter 2 of the
Motorola HighSpeed CMOS Data Book (DL129/D).
PIN DESCRIPTIONS
INPUTS
A0, A1, A2, A3 (Pins 2, 5, 11, 14)
Nibble A input. The data present on these pins is trans-
ferred to the output when the Select input is at a low level and
the Output Enable input is at a low level. The data is pres-
ented to the outputs in noninverted form.
B0, B1, B2, B3 (Pins 3, 6, 10, 13)
Nibble B input. The logic data present on these pins is
transferred to the output when the Select input is at a high
level and the Output Enable input is at a low level. The data
is presented to the outputs in noninverted form.
OUTPUTS
Y0, Y1, Y2, Y3 (Pins 4, 7, 9, 12)
Nibble output. The selected nibble input is presented at
these outputs when the Output Enable input is at a low level.
For the Output Enable input at a high level, the outputs are
switched to the high impedance state.
CONTROL INPUTS
Select (Pin 1)
Nibble select. This input determines the nibble to be trans-
ferred to the outputs. A low level on this input selects the A
inputs and a high level selects the B inputs.
Output Enable (Pin 15)
Output Enable. A low level on this input allows the selected
input data to be presented at the outputs. A high level on this
input forces the outputs into the highimpedance state.
MC74HC257
MOTOROLA
HighSpeed CMOS Logic Data
DL129 -- Rev 6
4
SWITCHING WAVEFORMS
Figure 1.
Figure 2.
Figure 3.
VCC
GND
tf
tr
NIBBLE INPUT
A OR B
OUTPUT Y
10%
50%
90%
10%
50%
90%
tTLH
tPLH
tPHL
tTHL
VCC
GND
50%
SELECT
tPLH
tPHL
50%
OUTPUT Y
VALID
VALID
OUTPUT
ENABLE
OUTPUT Y
OUTPUT Y
50%
50%
50%
90%
10%
tPZL
tPLZ
tPZH
tPHZ
VCC
GND
HIGH
IMPEDANCE
VOL
VOH
HIGH
IMPEDANCE
TEST CIRCUITS
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 4.
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 5.
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
1 k
MC74HC257
HighSpeed CMOS Logic Data
DL129 -- Rev 6
5
MOTOROLA
EXPANDED LOGIC DIAGRAM
NIBBLE
INPUTS
A0
B0
A1
B1
A2
B2
A3
B3
SELECT
OUTPUT
ENABLE
2
3
5
6
11
10
14
13
15
1
NIBBLE
OUTPUT
Y0
Y1
Y2
Y3
12
9
7
4
MC74HC257
MOTOROLA
HighSpeed CMOS Logic Data
DL129 -- Rev 6
6
OUTLINE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 64808
ISSUE R
MIN
MIN
MAX
MAX
INCHES
MILLIMETERS
DIM
A
B
C
D
F
G
H
J
K
L
M
S
18.80
6.35
3.69
0.39
1.02
0.21
2.80
7.50
0
0.51
19.55
6.85
4.44
0.53
1.77
0.38
3.30
7.74
10
1.01
0.740
0.250
0.145
0.015
0.040
0.008
0.110
0.295
0
0.020
0.770
0.270
0.175
0.021
0.070
0.015
0.130
0.305
10
0.040
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
2.54 BSC
1.27 BSC
0.100 BSC
0.050 BSC
A
B
1
8
9
16
F
H
G
D
16 PL
S
C
T
SEATING
PLANE
K
J
M
L
T
A
0.25 (0.010)
M
M
0.25 (0.010)
T
B
A
M
S
S
MIN
MIN
MAX
MAX
MILLIMETERS
INCHES
DIM
A
B
C
D
F
G
J
K
M
P
R
9.80
3.80
1.35
0.35
0.40
0.19
0.10
0
5.80
0.25
10.00
4.00
1.75
0.49
1.25
0.25
0.25
7
6.20
0.50
0.386
0.150
0.054
0.014
0.016
0.008
0.004
0
0.229
0.010
0.393
0.157
0.068
0.019
0.049
0.009
0.009
7
0.244
0.019
1.27 BSC
0.050 BSC
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
1
8
9
16
A
B
D
16 PL
K
C
G
T
SEATING
PLANE
R
X 45
M
J
F
P
8 PL
0.25 (0.010)
B
M
M
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B05
ISSUE J
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Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,
and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different
applications. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does
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MC74HC257/D
*MC74HC257/D*
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