© 1999 Scenix Semiconductor, Inc. All rights reserved. - 4 - www.scenix.com SX18AC  / SX20AC / SX28AC 2.0 CONNECTION DIAGRAMS 2.1 Pin Assignments 2.2 Pin Descriptions SSOP 1
2
3
4
5
6
7
8 16
15 RC4
RC3 RB6
RB5 SX  28-PIN OSC2
RC7
RC6
RC5 V_dd
V_dd RA2
RA3
RB0
RB1
RB2
RB3
RB4 Vss MCLR
OSC1 RC2
RC1
RC0
RB7 9
10
11
12
13
14 28
27
26
25
24
23
22
21
20
19
18
17      Vss
RTCC RA0
RA1 1
2
3
4
5
6
7
8 16
15 RC4
RC3 RB6
RB5 SX  28-PIN OSC2
RC7
RC6
RC5 n.c.
Vss RA2
RA3
RB0
RB1
RB2
RB3
RB4 MCLR
OSC1 RC2
RC1
RC0
RB7 9
10
11
12
13
14 28
27
26
25
24
23
22
21
20
19
18
17 RTCC V_dd RA0
RA1 n.c. DIP/SOIC 1
2
3
4
5
6
7
8 16
15 RB5
RB4 SX  20-PIN OSC2 RTCC RA0 RB0
RB1
RB2
RB3 MCLR OSC1 V_dd
V_dd RB7
RB6 9
10 14
13
12
11 20
19
18
17 RA2
RA3 Vss RA1 Vss SSOP 1
2
3
4
5
6
7
8 16
15 RB5
RB4 SX  18-PIN OSC2 RTCC RA0 RB0
RB1
RB2
RB3 MCLR OSC1 V_dd RB7
RB6 9 10 14
13
12
11 18
17 RA2
RA3 RA1 Vss DIP/SOIC Name Pin Type    Input Levels Description RA0 I/O TTL/CMOS Bidirectional I/O Pin; symmetrical source / sink capability RA1 I/O TTL/CMOS Bidirectional I/O Pin; symmetrical source / sink capability RA2 I/O TTL/CMOS Bidirectional I/O Pin; symmetrical source / sink capability RA3 I/O TTL/CMOS Bidirectional I/O Pin; symmetrical source / sink capability RB0 I/O TTL/CMOS/ST  Bidirectional I/O Pin; comparator output; MIWU input RB1 I/O TTL/CMOS/ST  Bidirectional I/O Pin; comparator negative input; MIWU input RB2 I/O TTL/CMOS/ST  Bidirectional I/O Pin; comparator positive input; MIWU input RB3 I/O TTL/CMOS/ST  Bidirectional I/O Pin; MIWU input RB4 I/O TTL/CMOS/ST  Bidirectional I/O Pin; MIWU input RB5 I/O TTL/CMOS/ST  Bidirectional I/O Pin; MIWU input RB6 I/O TTL/CMOS/ST  Bidirectional I/O Pin; MIWU input RB7 I/O TTL/CMOS/ST  Bidirectional I/O Pin; MIWU input RC0 I/O TTL/CMOS/ST  Bidirectional I/O pin RC1 I/O TTL/CMOS/ST  Bidirectional I/O pin RC2 I/O TTL/CMOS/ST  Bidirectional I/O pin RC3 I/O TTL/CMOS/ST  Bidirectional I/O pin RC4 I/O TTL/CMOS/ST  Bidirectional I/O pin RC5 I/O TTL/CMOS/ST  Bidirectional I/O pin RC6 I/O TTL/CMOS/ST  Bidirectional I/O pin RC7 I/O TTL/CMOS/ST  Bidirectional I/O pin RTCC I ST Input to Real-Time Clock/Counter MCLR I ST Master Clear reset input – active low OSC1/In/Vpp I ST Crystal oscillator input – external clock source input OSC2/Out O CMOS Crystal oscillator output – in R/C mode, internally pulled to V_dd through weak
pull-up V_dd P – Positive supply pin Vss P –                                                                                     Ground pin
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