Sam4s ER-390 SERIES Service Manual page 32

6 Reference Information
6-1 Semiconductor Base Diagram
6-1-2 Memory
6-1-3 Logic ICs
V CC B4 A4 Y4 B3
14 13 12 11 10
1 2 3 4 5
A1 B1 Y1 A2 B2
Figure 6-4 74HCT08
1
A0
ADDRESS
2
A1
INPUTS
3
A2
6
CS1
CHIP–
4
CS2
SELECT
INPUTS
5
CS3
FUNCTION TABLE
2
A1
3
A2
4
A3
5
A4
Data
Inputs
6
A5
7
A6
8
A7
9
A8
1
Output
OE1
OE2
Enables
19
6-4
Figure 6-3 EPROM M27C4001 Specification
FUNCTION TABLE
A3 Y3
9 8
Inputs
A B
L L
L H
H L
H H
6 7
Y2 GND
LOGIC DIAGRAM
15
Y0
14
Y1
13
Y2
12
Y3
11
Y4
10
Y5
9
Y6
7
Y7
PIN 16 = V CC
PIN 8 = GND
18
Y1
17
Y2
16
Y3
15
Y4
14
Y5
13
Y6
12
Y7
11
Y8
PIN 20 = V
CC
PIN 10 = GND
V CC A6 Y6
Output 14 13 12
Y
L
L
L
H
1 2 3
A1 Y1 A2
Inputs
CS1 CS2 CS3 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X H
ACTIVE–LOW
X H X
OUTPUTS
L X X
H L L
H L L
H L L
H L L
H L L
H L L
H L L
H L L
H = high level (steady state); L = low level (steady state); X = don't care
Figure 6-6 74HC138
Noninverting
Outputs
Figure 6-7 74HC541
A5 Y5 A4 Y4
FUNCTION TABLE
11 10 9 8
Inputs
4 5 6 7
Y2 A3 Y3 GND
Figure 6-5 74HC14
FUNCTION TABLE
Outputs
X X X H H H H H
X X X H H H H H
X X X H H H H H
L L L L H H H H
L L H H L H H H
L H L H H L H H
L H H H H H L H
H L L H H H H L
H L H H H H H H
H H L H H H H H
H H H H H H H H
FUNCTION TABLE
Inputs
Output Y
OE1 OE2 A
L L L L
L L H H
H X X Z
X H X Z
X = Don't Care
Z = High Impedance
SAM4S ER-390 SERIES
Outputs
A Y
L H
H L
H H H
H H H
H H H
H H H
H H H
H H H
H H H
H H H
L H H
H L H
H H L