Exar AN-454 St16c454/554/654 application example Datasheet

AN454
AN554
AN654
Printed February 27, 1997
ST16C454/554/654 APPLICATION EXAMPLE
Rev. 2.0
7-33
GND
RST
+5V
IRQ9
-5V
DRQ2
-12V
OWS
+12V
GND
SMEMW
SMEMR
IOW
IOR
DACK3
DRQ3
DACK1
DRQ1
REF
CLK
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
DACK2
T/C
BALE
+5V
OSC
GND
IOCK
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
IORDY
AEN
SA19
SA18
SA17
SA16
SA15
SA14
SA13
SA12
SA11
SA10
SA9
SA8
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
7-38
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
IBMB
JB1
IBMA
JA1
VCC
-12V
+12V
VCC
9
8
7
6
5
4
3
2
1
SAEN*
SA9
SA8
SA7
SA6
SA5
SA4
SA3
GND
IRQ5
IRQ4
IRQ3
IRQ7
+12V
-12V
VCC
9
8
7
6
5
4
3
2
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
1
19
PAL16L8
I9
I8
I7
I6
I5
I4
I3
I2
I1
U1
74ALS245
A8
A7
A6
A5
A4
A3
A2
A1
DIR
G
11
12
13
14
15
16
17
18
VCC
I10
O1
IO2
IO3
IO4
IO5
IO6
IO7
O8
B8
B7
B6
B5
B4
B3
B2
B1
11
12
13
14
15
16
17
18
19
6
19
1
2
3
4
5
6
7
8
9
74LS245
G
DIR
A1
A2
A3
A4
A5
A6
A7
A8
U?
74LS13
U?A
B1
B2
B3
B4
B5
B6
B7
B8
2
1
5
4
18
17
16
15
14
13
12
11
74LS13
U?B
IRQEN
IRQOUT
3F8
2F8
3E8
2E8
IRQIN
8
D7
D6
D5
D4
D3
D2
D1
D0
RESET
SA2
SA1
SA0
IOW*
IOR*
10
9
13
12
CS2*
CS3*
CS0*
CS1*
UARTS APPLICATION NOTE
AN554
GND
VCC
IRQ3
IRQ4
IRQ5
IRQ7
RESET
3F8
2F8
3E8
2E8
IOR*
IOW*
SA0
SA1
SA2
D0
D1
D2
D3
D4
D5
D6
D7
VCC
1
3
5
7
1
3
5
7
1
3
5
7
1
3
5
7
1
3
5
7
HDR2X4
J6
HDR2X4
J5
HDR2X4
J4
HDR2X4
J2
HDR2X4
J3
2
4
6
8
2
4
6
8
2
4
6
8
2
4
6
8
2
4
6
8
RS1
10K-SIP
HDR1X2
J7
INTA
INTB
INTC
INTD
31
65
30
38
39
15
21
49
55
37
16
20
50
54
52
18
34
33
32
66
67
68
1
2
3
4
5
C1
22pF
7.3728 MHz
X1
SEL 16/68
IRQSEL
SEL CLOCK
RXRDY
TXRDY
INTA
INTB
INTC
INTD
RESET
CSA
CSB
CSC
CSD
IOR
IOW
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
U4
ST16554CJ
X1
35
C2
22pF
RXD
DSRD
CTSD
CDD
RID
TXD
DTRD
RTSD
RXC
DSRC
CTSC
CDC
RIC
TXC
DTRC
RTSC
RXB
DSRB
CTSB
CDB
RIB
TXB
DTRB
RTSB
RXA
DSRA
CTSA
CDA
RIA
TXA
DTRA
RTSA
X2
36
7-39
63
60
59
61
62
53
58
56
41
44
45
43
42
51
46
48
29
26
25
27
28
19
24
22
7
10
11
9
8
17
12
14
RXD*
DSRD*
CTSD*
CDD*
RID*
TXD*
DTRD*
RTSD*
RXC*
DSRC*
CTSC*
CDC*
RIC*
TXC*
DTRC*
RTSC*
RXB*
DSRB*
CTSB*
CDB*
RIB*
TXB*
DTRB*
RTSB*
RXA*
DSRA*
CTSA*
CDA*
RIA*
TXA*
DTRA*
RTSA*
UARTS APPLICATION NOTE
VCC
AN554
TXA*
RTSA*
TXB*
DTRA*
RTSB*
DTRB*
2
4
5
9
10
13
12
2
4
5
9
10
13
12
3
6
8
11
3
6
8
11
3
6
8
11
U5
INA1
INB1
INB2
INC2
INC1
IND1
IND2
MC1488CP
U6
INA1
INB1
INB2
INC2
INC1
IND1
IND2
MC1488CP
U9
OUTA
OUTB
OUTC
OUTD
MC1489CP
U11
OUTA
OUTB
OUTC
OUTD
MC1489CP
U10
OUTA
OUTB
OUTC
OUTD
C1489C
VDD
VSS
OUTA
OUTB
OUTC
OUTD
VDD
VSS
OUTA
OUTB
OUTC
OUTD
INA
C1
INB
C2
INC
C3
IND
C4
INA
C1
INB
C2
INC
C3
IND
C4
INA
C1
INB
C2
INC
C3
IND
C4
14
3
6
8
11
1
14
3
6
8
11
1
1
2
4
5
10
9
13
12
1
2
4
5
10
9
13
12
1
2
4
5
10
9
13
12
+12V
-12V
+12V
-12V
TXD
RTSD
CTSD
DSRD
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
1
6
2
7
3
8
4
9
5
J8
DB25RA/M
J9
DB9RA/M
+12V
VCC
-12V
VCC
+12V
-12V
GND
7-40
TXD*
RTSD*
RXA*
CTSA*
DSRA*
CDA*
RIA*
CDB*
DSRB*
RXB*
CTSB*
RIB*
CTSD*
DSRD*
UARTS APPLICATION NOTE
AN554
7-41
-12V
GND
+12V
VCC
DSRC*
RXD*
CDD*
RID*
RXC*
CDC*
RIC*
CTSC*
DTRD*
RTSC*
TXC*
DTRC*
-12V
VCC
+12V
3
6
8
11
3
6
8
11
2
4
5
9
10
13
12
MC1489CP
OUTA
OUTB
OUTC
OUTD
U8
MC1489CP
OUTA
OUTB
OUTC
OUTD
U7
MC1488CP
INA1
INB1
INB2
INC2
INC1
IND1
IND2
U4
VDD
INA
C1
INB
C2
INC
C3
IND
C4
INA
C1
INB
C2
INC
C3
IND
C4
VSS
OUTA
OUTB
OUTC
OUTD
14
1
2
4
5
10
9
13
12
1
2
4
5
10
9
13
12
1
3
6
8
11
-12V
RTSD
TXD
1
3
5
7
9
1
3
5
7
9
HDR2X5
J7
HDR2X5
J6
2
4
6
8
10
2
4
6
8
10
DSRD
CTSD
UARTS APPLICATION NOTE
+12V
AN554
UARTS APPLICATION NOTE
AN554
7-42
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