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MC14549BDW Arkusz danych(PDF) 1 Page - Motorola, Inc

Numer części MC14549BDW
Szczegółowy opis  SUCCESSIVE APPROXIMATION REGISTERS
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Producent  MOTOROLA [Motorola, Inc]
Strona internetowa  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC14549BDW Arkusz danych(HTML) 1 Page - Motorola, Inc

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MOTOROLA CMOS LOGIC DATA
1
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.
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 VSS)
Rating
Symbol
Value
Unit
DC Supply Voltage
VDD
– 0.5 to + 18
Vdc
Input Voltage, All Inputs
Vin
– 0.5 to VDD + 0.5
Vdc
DC Input Current, per Pin
Iin
± 10
mAdc
Power Dissipation, per Package†
PD
500
mW
Operating Temperature Range
TA
– 55 to + 125
_C
Storage Temperature Range
Tstg
– 65 to + 150
_C
* 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
SC SC(t–1) MR MR(t–1) Clock
Action
X
X
X
X
None
X
X
1
X
Reset
1
0
0
0
Start
Conversion
1
X
0
1
Start
Conversion
1
1
0
0
Continue
Conversion
0
X
0
X
Continue
Previous
Operation
TRUTH TABLES
MC14549B
X = Don’t Care
t–1 = State at Previous Clock
SC
SC(t–1) EOC Clock
Action
X
X
X
None
1
0
0
Start
Conversion
X
1
0
Continue
Conversion
0
0
0
Continue
Conversion
0
X
1
Retain
Conversion
Result
1
X
1
Start
Conversion
MC14559B
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
© Motorola, Inc. 1995
REV 3
1/94
MC14549B
MC14559B
L SUFFIX
CERAMIC
CASE 620
ORDERING INFORMATION
MC14XXXBCP
Plastic
MC14XXXBCL
Ceramic
MC14XXXBDW
SOIC
TA = – 55° to 125°C for all packages.
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOIC
CASE 751G
PIN ASSIGNMENT
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
Q0
Q1
Q2
Q3
VDD
SC
*
EOC
Q7
Q6
Q5
Q4
VSS
C
D
Sout
* For MC14549B Pin 10 is MR input.
For MC14559B Pin 10 is FF input.


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