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MC14549BCLS

更新时间： 2024-11-24 12:58:35
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摩托罗拉 - MOTOROLA /
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MC14549BCLS 数据手册

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SEMICONDUCTOR TECHNICAL DATA  
The MC14549B and MC14559B successive approximation registers are  
8–bit registers providing all the digital control and storage necessary for  
successive approximation analog–to–digital conversion systems. These  
parts differ in only one control input. The Master Reset (MR) on the  
MC14549B is required in the cascaded mode when more than 8 bits are  
desired. The Feed Forward (FF) of the MC14559B is used for register  
shortening where End–of–Conversion (EOC) is required after less than eight  
cycles.  
L SUFFIX  
CERAMIC  
CASE 620  
P SUFFIX  
PLASTIC  
CASE 648  
Applications for the MC14549B and MC14559B include analog–to–digital  
conversion, with serial and parallel outputs.  
•
•
•
•
•
•
Totally Synchronous Operation  
All Outputs Buffered  
Single Supply Operation  
Serial Output  
DW SUFFIX  
SOIC  
CASE 751G  
Retriggerable  
ORDERING INFORMATION  
Compatible with a Variety of Digital and Analog Systems such as the  
MC1408 8–Bit D/A Converter  
All Control Inputs Positive–Edge Triggered  
MC14XXXBCP  
MC14XXXBCL  
MC14XXXBDW  
Plastic  
Ceramic  
SOIC  
•
•
•
Supply Voltage Range = 3.0 Vdc to 18 Vdc  
T
A
= – 55° to 125°C for all packages.  
Capable of Driving Two Low–Power TTL Loads, One Low–Power  
Schottky TTL Load or Two HTL Loads Over the Rated Temperature  
Range  
•
Chip Complexity: 488 FETs or 122 Equivalent Gates  
PIN ASSIGNMENT  
MAXIMUM RATINGS* (Voltages referenced to V  
)
SS  
Q4  
Q5  
Q6  
Q7  
1
2
16  
15  
V
DD  
Rating  
DC Supply Voltage  
Symbol  
Value  
Unit  
Vdc  
Vdc  
mAdc  
mW  
C
Q3  
V
DD  
– 0.5 to + 18  
3
4
5
6
7
8
14  
13  
12  
11  
10  
9
Q2  
Input Voltage, All Inputs  
V
– 0.5 to V + 0.5  
DD  
in  
in  
Q1  
DC Input Current, per Pin  
I
± 10  
S
Q0  
out  
Power Dissipation, per Package†  
Operating Temperature Range  
Storage Temperature Range  
P
500  
D
D
EOC  
T
A
– 55 to + 125  
– 65 to + 150  
C
*
T
stg  
C
V
SC  
* Maximum Ratings are those values beyond which damage to the device may occur.  
†Temperature Derating:  
SS  
* For MC14549B Pin 10 is MR input.  
For MC14559B Pin 10 is FF input.  
“P and D/DW” Packages: – 7.0 mW/C From 65 C To 125 C Ceramic  
“L” Packages: – 12 mW/ C From 100 C To 125 C  
TRUTH TABLES  
MC14549B  
MC14559B  
SC SC( ) MR MR( ) Clock  
t–1 t–1  
Action  
None  
SC SC( ) EOC Clock  
t–1  
Action  
None  
X
X
1
X
X
1
0
X
X
1
X
0
X
0
X
0
X
0
Reset  
Start  
Conversion  
Start  
Conversion  
X
0
0
1
0
0
0
1
Continue  
Conversion  
1
1
0
X
1
0
0
0
1
0
Start  
Conversion  
Continue  
Conversion  
Continue  
Conversion  
X
Retain  
Conversion  
Result  
X
X
Continue  
Previous  
Operation  
1
X
1
Start  
Conversion  
X = Don’t Care t–1 = State at Previous Clock  
REV 3  
1/94  
Motorola, Inc. 1995  
1234567...9

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