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HC257 の電気的特性と機能

HC257のメーカーはMotorola Incです、この部品の機能は「Quad 2-Input Data Selector/Multiplexer with 3-State Outputs」です。


製品の詳細 ( Datasheet PDF )

部品番号 HC257
部品説明 Quad 2-Input Data Selector/Multiplexer with 3-State Outputs
メーカ Motorola Inc
ロゴ Motorola  Inc ロゴ 




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HC257 Datasheet, HC257 PDF,ピン配置, 機能
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Quad 2-Input Data
Selector/Multiplexer with
3-State Outputs
High–Performance Silicon–Gate 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 (4–bit) 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 high–impedance state.
The HC257 is similar in function to the HC157 which do not have 3–state
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 µA
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
NIBBLE
A INPUT
NIBBLE
B INPUT
A0 2
A1 5
A2 11
A3 14
B0 3
B1 6
B2 10
B3 13
4 Y0
7 Y1 NONINVERTING
9
Y2
NIBBLE
OUTPUT
12 Y3
SELECT 1
OUTPUT 15
ENABLE
PIN 16 = VCC
PIN 8 = GND
MC74HC257
16
1
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
16
1
D SUFFIX
SOIC PACKAGE
CASE 751B–05
ORDERING INFORMATION
MC74HCXXXN
MC74HCXXXD
Plastic
SOIC
PIN ASSIGNMENT
SELECT
A0
B0
1
2
3
16 VCC
15
OUTPUT
ENABLE
14 A3
Y0 4
A1 5
13 B3
12 Y3
B1 6
Y1 7
11 A2
10 B2
GND 8
9 Y2
FUNCTION TABLE
Inputs
Output
Enable Select
Outputs
Y0 – Y3
HX
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.
10/95
© Motorola, Inc. 1995
1 REV 6

1 Page





HC257 pdf, ピン配列
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎAC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎSymbol
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtPLH,
tPHL
Parameter
Maximum Propagation Delay, Nibble A or B to Output Y
(Figures 1 and 4)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtPLH,
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtPHL
Maximum Propagation Delay, Select to Output Y
(Figures 2 and 4)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtPLZ,
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtPHZ
Maximum Propagation Delay, Output Enable to Output Y
(Figures 3 and 5)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtPZL,
tPZH
Maximum Propagation Delay, Output Enable to Output Y
(Figures 3 and 5)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtTLH,
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎtTHL
Maximum Output Transition Time, Any Output
(Figures 1 and 4)
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎCin
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎCout
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎNOTES:
Maximum Input Capacitance
Maximum Three–State Output Capacitance
(Output in High–Impedance State)
MC74HC257
VCC
V
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
Guaranteed Limit
v v– 55 to
25_C
85_C
125_C
100 125 150
20 25 30
17 21 26
100 125 150
20 25 30
17 21 26
150 190 225
30 38 45
26 33 38
150 190 225
30 38 45
26 33 38
60 75 90
12 15 18
10 13 15
10 10 10
15 15 15
Unit
ns
ns
ns
ns
ns
pF
pF
1. For propagation delays with loads other than 50 pF, see Chapter 2 of the Motorola High–Speed CMOS Data Book (DL129/D).
2. Information on typical parametric values can be found in Chapter 2 of the Motorola High–Speed CMOS Data Book (DL129/D).
Typical @ 25°C, VCC = 5.0 V
CPD
Power Dissipation Capacitance (Per Package)*
39 pF
* Used to determine the no–load dynamic power consumption: PD = CPD VCC2f + ICC VCC. For load considerations, see Chapter 2 of the
Motorola High–Speed 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 high–impedance state.
High–Speed CMOS Logic Data
DL129 — Rev 6
3
MOTOROLA


3Pages


HC257 電子部品, 半導体
MC74HC257
–A
16
1
H
G
OUTLINE DIMENSIONS
9
B
8
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
FC
S
–T
SEATING
PLANE
K
J
D 16 PL
0.25 (0.010) M T A M
L
M
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.
INCHES
MILLIMETERS
DIM MIN MAX MIN MAX
A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.070 1.02 1.77
G
0.100 BSC
2.54 BSC
H
0.050 BSC
1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M
0° 10°
0° 10°
S 0.020 0.040 0.51 1.01
–A
16
1
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
9
–B
8
P 8 PL
0.25 (0.010) M
BM
–T
SEATING
PLANE
G
K
C
D 16 PL
0.25 (0.010) M T B S A S
M
R X 45°
F
J
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.
MILLIMETERS
INCHES
DIM MIN MAX MIN MAX
A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G
1.27 BSC
0.050 BSC
J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0° 7° 0° 7°
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019
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
not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in
systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of
the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such
unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless
against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
How to reach us:
USA/EUROPE: Motorola Literature Distribution;
P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447
JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, Toshikatsu Otsuki,
6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–3521–8315
MFAX: [email protected] –TOUCHTONE (602) 244–6609
INTERNET: http://Design–NET.com
HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
MOTOROLA
CODELINE
*MC74HC257/D*MC74HC257/D
6 High–Speed CMOS Logic Data
DL129 — Rev 6

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