MC14549B Datasheet, PDF (1/9 Pages) Motorola, Inc – SUCCESSIVE APPROXIMATION REGISTERS

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Successive Approximation
Registers
MC14549B
MC14559B
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.
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
• 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
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Range
• Chip Complexity: 488 FETs or 122 Equivalent Gates
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ _{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
DW SUFFIX
SOIC
CASE 751G
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
Plastic
Ceramic
SOIC
TA = – 55° to 125°C for all packages.
PIN ASSIGNMENT
Q4 1
Q5 2
16 VDD
15 Q3
Q6 3
14 Q2
Q7 4
13 Q1
Sout 5
D6
12 Q0
11 EOC
C7
VSS 8
10 _*
9 SC
* For MC14549B Pin 10 is MR input.
For MC14559B Pin 10 is FF input.
MC14549B
TRUTH TABLES
MC14559B
SC SC(t–1) MR MR(t–1) Clock Action
SC SC(t–1) EOC Clock Action
X
X
X
X
None
X
X
X
None
X
X1
X
Reset
1
0
0
1
00
0
Start
Conversion
X
1
0
1
X0
1
Start
Conversion
0
0
0
1
10
0
Continue
Conversion
0
X
1
0
X0
X
Continue
Previous
Operation
1
X
1
X = Don’t Care t–1 = State at Previous Clock
Start
Conversion
Continue
Conversion
Continue
Conversion
Retain
Conversion
Result
Start
Conversion
REV 3
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©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
MC14549B MC14559B
1