MC74HC257N Motorola, MC74HC257N Datasheet

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MC74HC257N

Manufacturer Part Number
MC74HC257N
Description
Quad 2-input data selector/multiplexer wirh 3-state outputs
Manufacturer
Motorola
Datasheet
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Quad 2-Input Data
Selector/Multiplexer with
3-State Outputs
High–Performance Silicon–Gate CMOS
compatible with standard CMOS outputs; with pullup resistors, they are
compatible with LSTTL outputs.
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.
outputs.
10/95
Motorola, Inc. 1995
The MC74HC257 is identical in pinout to the LS257. The device inputs are
This device selects a (4–bit) nibble from either the A or B inputs as
The HC257 is similar in function to the HC157 which do not have 3–state
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
A INPUT
B INPUT
NIBBLE
NIBBLE
OUTPUT
SELECT
ENABLE
A0
A1
A2
A3
B0
B1
B2
B3
2
5
11
14
3
6
1
15
10
13
LOGIC DIAGRAM
PIN 16 = V CC
PIN 8 = GND
12
4
7
9
Y0
Y1
Y2
Y3
NONINVERTING
NIBBLE
OUTPUT
1
REV 6
16
16
MC74HC257
1
SELECT
X = don’t care
Z = high impedance
A0 – A3, B0 – B3 = the levels of the
respective Nibble Inputs.
Output
Enable
ORDERING INFORMATION
MC74HCXXXN
MC74HCXXXD
1
GND
H
L
L
PIN ASSIGNMENT
A0
B0
Y0
A1
B1
Y1
FUNCTION TABLE
Inputs
1
2
3
4
5
6
7
8
Select
X
H
L
PLASTIC PACKAGE
SOIC PACKAGE
CASE 751B–05
CASE 648–08
16
15
14
13
12
10
11
9
Outputs
N SUFFIX
D SUFFIX
Y0 – Y3
A0 – A3
B0 – B3
Plastic
SOIC
Z
V CC
OUTPUT
ENABLE
A3
B3
Y3
A2
B2
Y2

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MC74HC257N Summary of contents

Page 1

... LOGIC DIAGRAM NIBBLE A1 A INPUT NIBBLE B1 B INPUT SELECT 15 OUTPUT ENABLE PIN PIN 8 = GND 10/95 Motorola, Inc. 1995 NONINVERTING Y1 NIBBLE 9 Y2 OUTPUT REV 6 MC74HC257 N SUFFIX PLASTIC PACKAGE CASE 648– SUFFIX SOIC PACKAGE 16 CASE 751B–05 1 ORDERING INFORMATION MC74HCXXXN Plastic MC74HCXXXD ...

Page 2

... Current (per Package) Î Î Î Î Î Î Î Î Î Î Î Î Î NOTE: Information on typical parametric values can be found in Chapter 2 of the Motorola High–Speed CMOS Data Book (DL129/D). MOTOROLA Î Î Î Î Î Î Î Î Î ...

Page 3

... NOTES: 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). ...

Page 4

... PLH 90% 50% OUTPUT Y 10% t TLH Figure 1. OUTPUT ENABLE OUTPUT Y OUTPUT Y TEST POINT OUTPUT DEVICE UNDER TEST * Includes all probe and jig capacitance Figure 4. MOTOROLA SWITCHING WAVEFORMS GND SELECT t PHL t PLH OUTPUT Y t THL 50% t PZL t PLZ 50% 10% t PZH t PHZ 90% 50% Figure 3 ...

Page 5

... NIBBLE INPUTS SELECT OUTPUT 15 ENABLE High–Speed CMOS Logic Data DL129 — Rev 6 EXPANDED LOGIC DIAGRAM 12 5 MC74HC257 NIBBLE OUTPUT MOTOROLA ...

Page 6

... 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 “ ...

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