DESCRIPTION
SPECIFICATIONS
The AA2020A and AA2820 are CMOS integrated circuits that are ideally suited
for the design of 4-phase unipolar and bipolar step motor drivers. These IC's
can be used to design half-step and full-step bilevel type drivers.
PARAMETER
SYMBOL
LIMITS
UNITS
MIN
4.75
3.5
0
TYP.
MAX
5.25
5.00
70
Supply Voltage
Input Voltage
Vdd
Vin
Ta
5.00
V
V
C
The basic function of these ICs is to take input (i.e. clock and direction) signals
and turn them into appropriate phase signals that are used to drive output
transistors. In most applications, the end user simply adds a few components
along with power transistors for the output stage. This results in low cost,
compact, and reliable designs.
-
-
Operating Temperature
(Ambient)
Storage Temperature
Power Dissipation
Supply current
Ts
0
-
70
C
mW
mA
The AA2020 comes in a 24-pin plastic DIP package. The AA2820 comes in
a 28-pin SOIC package. See dimensions below.
250
50
15
Min. clock Pulse Width
twh, twl
tpd
usec
sec
Propagation Delay Time
(Clock to Output )
3.5
5
Oscillator Frequency
Rise Time
Fosc
800
1
1000
1200
kHz
usec
usec
tr
tf
Fall Time
1
Figure 1: AA2020A Dimensions.
Figure 2: AA2820 Dimensions.
1
2
ETC [ ETC ]
