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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Successive Approximation
Registers
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.
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
Retriggerable
Compatible with a Variety of Digital and Analog Systems such as the
MC1408 8–Bit D/A Converter
All Control Inputs Positive–Edge Triggered
Supply Voltage Range = 3.0 Vdc to 18 Vdc
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
MAXIMUM RATINGS*
(Voltages referenced to V SS )
Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î Î
Rating
DC Supply Voltage
Input Voltage, All Inputs
DC Input Current, per Pin
Power Dissipation, per Package†
Operating Temperature Range
Storage Temperature Range
* Maximum Ratings are those values beyond which damage to the device may occur.
†Temperature Derating:
"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
MC14549B
SC SC( t–1 ) MR MR( t–1 ) Clock
X
X
X
X
X
X
1
X
1
0
0
0
1
X
0
1
1
1
0
0
0
X
0
X
X = Don't Care t–1 = State at Previous Clock
MC14549B MC14559B
6–398
Symbol
Value
V DD
– 0.5 to + 18
V in
– 0.5 to V DD + 0.5
I in
10
P D
500
T A
– 55 to + 125
T stg
– 65 to + 150
TRUTH TABLES
MC14559B
Action
SC SC( t–1 ) EOC Clock
None
X
X
Reset
1
0
Start
Conversion
X
1
Start
Conversion
0
0
Continue
Conversion
0
X
Continue
Previous
Operation
1
X
MC14549B
MC14559B
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
T A = – 55 to 125 C for all packages.
Q4
Unit
Q5
Vdc
Q6
Vdc
Q7
mAdc
S out
mW
_ C
_ C
V SS
* For MC14549B Pin 10 is MR input.
For MC14559B Pin 10 is FF input.
Action
X
None
0
Start
Conversion
0
Continue
Conversion
0
Continue
Conversion
1
Retain
Conversion
Result
1
Start
Conversion
MOTOROLA CMOS LOGIC DATA
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOIC
CASE 751G
Plastic
Ceramic
SOIC
PIN ASSIGNMENT
1
16
V DD
2
15
Q3
3
14
Q2
4
13
Q1
5
12
Q0
D
6
11
EOC
C
7
10
*
8
9
SC
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