MC14549B, MC14559B
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.
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MARKING
DIAGRAMS
Applications for the MC14549B and MC14559B include
analog−to−digitalconversion, with serial and parallel outputs.
16
1
PDIP−16
P SUFFIX
CASE 648
MC145x9BCP
AWLYYWWG
Features
• Totally Synchronous Operation
• All Outputs Buffered
• Single Supply Operation
1
16
• Serial Output
SO−16W
DW SUFFIX
CASE 751G
MC145x9B
AWLYYWWG
• Retriggerable
1
• Compatible with a Variety of Digital and Analog Systems such as the
MC1408 8−Bit D/A Converter
1
• All Control Inputs Positive−Edge Triggered
• Supply Voltage Range = 3.0 Vdc to 18 Vdc
• Capable of Driving 2 Low−Power TTL Loads, 1 Low−Power Schottky
TTL Load or 2 HTL Loads Over the Rated Temperature Range
• Chip Complexity: 488 FETs or 122 Equivalent Gates
• Pb−Free Packages are Available*
x
A
= 4 or 5
= Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G
= Pb−Free Package
MAXIMUM RATINGS (Voltages Referenced to V
)
SS
Parameter
Symbol
Value
−0.5 to +18.0
Unit
V
PIN ASSIGNMENT
DC Supply Voltage Range
V
DD
Input Voltage Range, All Inputs
DC Input Current per Pin
V
−0.5 to V + 0.5
V
Q4
Q5
Q6
Q7
1
2
3
4
5
6
7
8
16
15
V
DD
in
DD
I
10
mA
mW
°C
Q3
in
Power Dissipation per Package (Note 1)
Operating Temperature Range
Storage Temperature Range
P
500
14 Q2
13 Q1
12 Q0
11 EOC
D
T
A
−55 to +125
−65 to +150
T
stg
°C
S
out
Stresses exceeding Maximum Ratings may damage the device. Maximum
Ratings are stress ratings only. Functional operation above the Recommended
Operating Conditions is not implied. Extended exposure to stresses above the
Recommended Operating Conditions may affect device reliability.
1. Temperature Derating:
D
C
10
*
V
9
SC
SS
Plastic “P and D/DW” Packages: – 7.0 mW/_C From 65_C To 125_C
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
*For MC14549B Pin 10 is MR input.
For MC14559B Pin 10 is FF input.
high−impedance circuit. For proper operation, V and V should be constrained to
in
out
the range V v (V or V ) v V
.
ORDERING INFORMATION
SS
in
out
DD
Unused inputs must always be tied to an appropriate logic voltage level
See detailed ordering and shipping information in the package
dimensions section on page 3 of this data sheet.
(e.g., either V or V ).
SS
DD
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
June, 2006 − Rev. 6
MC14549B/D