75
S-301
SN74LV244APW (IC708, 719: 1U-3694) BU2090F (IC303: 1U-3681)
SN74HCT244APW (IC205: 1U-3694) (IC504: 1U-3695)
SN74LV157APW (IC303: 1U-3692)
(IC704, 715, 720, 721: 1U-3694) SN74LVC139APWR (IC902: 1U-3694))
LMS202 (IC101: 1U-3694)
1
2
3
4
5
6
7
8
20
19
18
16
15
14
13
I3
VCC
OE2
O2
I5
O0
I4
O1
I6
OE
I0
O4
I1
O5
I2
O6
912
O7 O3
10 11
GND
I7
17
1
2
3
4
5
6
7
8
18
17
16
15
14
13
12
11Q3
VDD
OE
Q7
Q8
Q11
Q10
Q9
Q6
VSS
DATA
CLOCK
LCK
Q0
Q1
Q2
9
10
Q4
Q5
CONT ROL CIRCUIT
1 2-b it SHIF T REGIS T ER
12- bi t STRAGE REGISTER
OUTPUT BUFFER(OPEN DRAI N)
1A
1B
1Y
2A
2B
2Y
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Vcc
ST
4A
4B
4Y
3A
3B
3Y
SE
LECT
5
SEL
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1G
1A
1B
1Y0
1Y1
1Y2
1Y3
GND
V
CC
2G
2A
2B
2Y0
2Y1
2Y2
2Y3
FUNCTION TABLE
(each decoder/demultiplexer)
INP U T S
OUTP UTS
G
SELECT
OUTP UTS
G
B A Y3 Y2 Y1 Y0
L L L H H H L
L L HHHLH
L H LHLHH
L H HLHHH
H X X H H H H
Pin Number Pin Name Pin Function
1, 3 C1+, C1 External capacitor connection pins.
2 V+ Positive supply for TIA/EIA-232E drivers.
4, 5 C2+, C2 External capacitor connection pins.
6 V Negative supply for TIA/EIA-232E drivers.
7, 14 T1out, T2out Transmitter output pins conform to TIA/EIA-232E levels. The typical transmitter output swing is
±
8V when loaded 3k load to ground. The open-circuit output voltage swings from (V+ 0.6V)
to V
8,13 R1in, R2in Receiver inputs accept TIA/EIA-232
9, 12 R1out and R2out Receiver output pins are TTL/CMOS compatible
10, 11 Tin1, Tin2 Transmitter input pins are TTL/CMOS compatible. Inputs of transmitter do not have pull-up
resistors. Connect all unused transmitter inputs to ground
15 GND Ground pin
16 V
S
Power supply pin for the device, +5V (
±
10%)
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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