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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Industrial Control Unit
The MC14500B Industrial Control Unit (ICU) is a single–bit CMOS
processor. The ICU is designed for use in systems requiring decisions based
on successive single–bit information. An external ROM stores the control
program. With a program counter (and output latches and input multiplexers,
if required) the ICU in a system forms a stored–program controller that
replaces combinatorial logic. Applications include relay logic processing,
serial data manipulation and control. The ICU also may control an MPU or be
controlled by an MPU.
16 Instructions
DC to 1.0 MHz Operation at V DD = 5 V
On–Chip Clock (Oscillator)
Executes One Instruction per Clock Cycle
3 to 18 V Operation
Low Quiescent Current Characteristic of CMOS Devices
Capable of Driving One Low–Power Schottky Load or Two Low–Power
TTL Loads over Full Temperature Range
BLOCK DIAGRAM
3
DATA
D
C
IEN
LU
14
X1
OSC
13
X2
7
I0
6
I1
INST
5
REG
I2
4
I3
1
RST
X1 — OSCILLATOR OUTPUT
X2 — OSCILLATOR INPUT
MOTOROLA CMOS LOGIC DATA
D
C
+ V
OEN
STO
STOC
MUX
D
C
RESULT
REG. (RR)
MC14500B
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
T A = – 55 to 125 C for all packages.
2
WRITE
16
WRITE
V DD
8
V SS
15
RR
12
JMP
11
RTN
10
FLAG O
9
FLAG F
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOIC
CASE 751G
Plastic
Ceramic
SOIC
PIN ASSIGNMENT
RST
1
16
V DD
RR
2
15
DATA
3
14
X1
I3
4
13
X2
I2
5
12
JMP
I1
6
11
RTN
I0
7
10
FLAG O
V SS
8
9
FLAG F
MC14500B
6–217
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