CY325 ETC, CY325 Datasheet - Page 90
CY325
Manufacturer Part Number
CY325
Description
Stepper System Controller
Manufacturer
ETC
Datasheet
1.CY325.pdf
(107 pages)
- Current page: 90 of 107
- Download datasheet (2Mb)
All CY545 signals are based on a positive logic convention, with a high voltage representing a
"1" and a low voltage representing a "0". Signals that are active low are indicated by a bar over
or slash after the pin name, i.e., BUSY/.
All input lines except the data bus include weak pull-up resistors. If the pins are left open, the
input signals will be high. The data bus pins must have external pull-up resistors to output a high
value. Where appropriate, an input line will be considered in the floating state if the CY545 can
drive it both high and low.
The data bus is bi-directional, and is tri-state during nonactive modes. Note that data bus
signals are positive logic.
The Restart line (pin#9) must be held
high upon power-up to properly initialize
the CY545. This may be accomplished by
using a 4.7 µFd capacitor, as shown in
Figure 18.1. Restart must be high for 10
milliseconds after power stabilizes on
power-up. Once the CY545 is running,
Restart need only be high for about 10
microseconds (11 MHz crystal).
© 2002 Cybernetic Micro Systems
C
C
C
Ambient Temperature under bias ................. 0C to +70C
Storage Temperature ................................... -65C to +150C
Voltage on any pin with respect to ground ... -0.5V to Vcc+0.5V
Power dissipation ......................................... 1.0 Watts
Reset Circuitry
H
H
H
A
A
A
P
P
P
T
T
T
E
E
E
R
R
CY545B Electrical Specifications
R
1
1
Absolute Maximum Ratings
DC & Operating Characteristics
1
8
8
8
(TA = 0C to +70C, Vcc = +5V +/-10%)
-
-
-
Electrical Conventions
E
E
E
L
L
L
E
E
E
C
C
C
T
T
T
R
R
R
I
I
I
85
C
C
C
A
A
A
L
L
L
S
S
S
P
P
P
Chapter 18 - Electrical Specifications
E
E
E
C
C
C
I
I
I
F
F
F
I
I
I
C
C
www.ControlChips.com
C
A
A
A
T
T
T
I
I
I
O
O
O
N
N
N
S
S
S
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