sx20ac Parallax, Inc., sx20ac Datasheet - Page 6

• Manufacturer Part Number: sx20ac
• Description: Configurable Communications Controllers With Ee/flash Program Memory, In-system Programming Capability And On-chip Debug
• Manufacturer: Parallax, Inc.

Parallax SX20AC/SX28AC
2.0
2.1.
2.2.
Note: I = input, O = output, I/O = Input/Output, P = Power, TTL = TTL input, CMOS = CMOS input, ST = Schmitt Trigger input, MIWU =
Multi-Input Wakeup input.
© Parallax Inc.
RA0
RA1
RA2
RA3
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
RC0
RC1
RC2
RC3
RC4
RC5
RC6
RC7
RTCC
MCLR
OSC1/In/Vpp
OSC2/Out
V
V
dd
ss
Name
CONNECTION DIAGRAMS
Pin Assignments
Pin Descriptions
Pin Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I
O
P
P
Input Levels
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
TTL/CMOS/ST
ST
ST
ST
CMOS
-
-
Figure 2-1: Pin Assignments
Table 2-1: Pin Descriptions
Bidirectional I/O Pin; symmetrical source / sink capability
Bidirectional I/O Pin; symmetrical source / sink capability
Bidirectional I/O Pin; symmetrical source / sink capability
Bidirectional I/O Pin; comparator negative input; MIWU/Interrupt input
Bidirectional I/O Pin; comparator positive input; MIWU/Interrupt input
Bidirectional I/O Pin; MIWU/Interrupt input
Bidirectional I/O Pin; MIWU/Interrupt input
Bidirectional I/O Pin; MIWU/Interrupt input
Bidirectional I/O Pin; MIWU/Interrupt input
Bidirectional I/O Pin; MIWU/Interrupt input
Bidirectional I/O Pin
Bidirectional I/O Pin
Bidirectional I/O Pin
Bidirectional I/O Pin
Bidirectional I/O Pin
Bidirectional I/O Pin
Bidirectional I/O Pin
Bidirectional I/O Pin
Master Clear reset input – active low. When not controlled externally, this pin must
be pulled high with a 10 kΩ resistor.
Crystal oscillator output; in R/C mode, internally pulled to V
Ground pin
Bidirectional I/O Pin; symmetrical source / sink capability
Bidirectional I/O Pin; comparator output; MIWU/Interrupt input
Input to Real-time Clock/counter
Crystal oscillator input; external clock source input
Positive supply pin
Page 6 of 51
Description
dd
through weak pull-up
Rev 1.6 11/20/2006
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