Bose FREESPACE 4400, Service Manual

Page: 101 / 107

101
Integrated Circuit Diagrams
M74HC4538M1R, Monostable Multivibrator
PINOUT DIAGRAM
SOP PACKAGE
PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
PIN No SYMBOL NAME AND FUNCTION
1, 15 1T1, 2T1
External Capacitor Con-
nections
2, 14 1T2, 2T2
External Resistor/
Capacitor Connections
3, 13 1CD, 2CD
Direct Reset Inputs
(Active Low)
4, 12 1A, 2A
Trigger Inputs (LOW to
HIGH, Edge-Triggered)
5, 11 1B, 2B
Trigger Inputs (HIGH to
LOW, Edge Triggered)
6, 10 Q1, Q2 Pulse Outputs
7, 9 Q1, Q2
Complementary Pulse
Outputs
8 GND Ground (0V)
16 Vcc Positive Supply Voltage
S T U P T U O S T U P N I
NOTE
A B CD Q Q
E L B A N E T U P T U O H H
T I B I H N I H L H L X
T I B I H N I H L H X H
E L B A N E T U P T U O H L
T I B I H N I H L L X X
IEC LOGIC SYMBOLS
M74HC590M1R, 8 Bit Counter
PINOUT DIAGRAM
SOP PACKAGE
IEC LOGIC SYMBOLS
TRUTH TABLE
X: Don’t Care
RCO = QA’·QB’·QC’·QD’·QE’·QF’·QG’·QH’ (QA’ to QH’ : INTERNAL OUTPUTS OF THE COUNTER)
PIN No SYMBOL NAME AND FUNCTION
1, 2, 3, 4, 5,
6, 7, 15
QA to QH Outputs
11 CCK Counter Clock Input
12 CCKEN Counter Clock Enable
Input
13 RCK Register Clock Input
9 RCO Ripple Carry Output
14 G Output Enable Input
10 CCLR Counter Clear Input
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
INPUTS
OUTPUT
G RCK CCLR CCKEN CCK
H X X X X Q OUTPUTS DISABLE
L X X X X Q OUTPUTS ENABLE
R E T S I G E R O T N I D E R O T S S I A T A D R E T N U O C X X X X
D E G N A H C T O N S I E G A T S R E T S I G E R X X X X
R A E L C R E T N U O C X X L X X
T N U O C E N O E C N A V D A L H X X
T N U O C O N L H X X
T N U O C O N X H H X X
SN74HC541D, Octal Buffer
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE1
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE2
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
TOP VIEW
FUNCTION TABLE
(each buffer/driver)
INPUTS
OUTPUT
OE1 OE2 A
Y
L L L L
L L H H
H X X Z
X H X Z
logic diagram (positive logic)
OE1
OE2
To Seven Other Channels
A1
Y1
1
19
8 1 2