Sam4s ER-5200M Service Manual

6 Reference Information
SAM4S ER-5200 Series 6-5
6-1 Semiconductor Base Diagram
6-1-3 Logic ICs
Figure 6-7 74HC138
Figure 6-8 74HC245
Figure 6-9 74HC541
Inputs Outputs
CS1CS2 CS3 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X H XXXHHHHHHHH
X H X XXXHHHHHHHH
L X X XXXHHHHHHHH
H L L LLL LHHHHHHH
H L L LLHHLHHHHHH
H L L LHLHHLHHHHH
H L L LHHHHHLHHHH
H L L HLLHHHHLHHH
H L L HLHHHHHHLHH
H L L HHLHHHHHHLH
H L L HHHHHHHHHHL
FUNCTION TABLE
H = high level (steady state); L = low level (steady state); X = don’t care
LOGIC DIAGRAM
7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
Y7
9
10
11
12
13
14
15
3
2
1
CS1
CS2
A0
A1
A2
ACTIVE–LOW
OUTPUTS
ADDRESS
INPUTS
CS3
CHIP–
SELECT
INPUTS
5
4
6
PIN 16 = V
CC
PIN 8 = GND
FUNCTION TABLE
A
DATA
PORT
A8
A7
A6
A5
A3
A4
A2
A1
9
8
7
6
5
4
3
2
DIRECTION
OUTPUT ENABLE
1
19
PIN 10 = GND
PIN 20 = V
CC
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
B
DATA
PORT
FUNCTION TABLE
Control Inputs
Output
Enable
Direction
Operation
L L Data Transmitted from Bus B to Bus A
L H Data Transmitted from Bus A to Bus B
H X Buses Isolated (High–Impedance State)
X = don’t care
18
Y1
2
A1
17
Y2
3
A2
16
Y3
4
A3
15
Y4
5
A4
14
Y5
6
A5
13
Y6
7
A6
12
Y7
8
A7
11
Y8
9
A8
OE1
OE2
1
19
Output
Enables
Data
Inputs
Noninverting
Outputs
PIN 20 = V
CC
PIN 10 = GND
L
L
H
X
L
L
X
H
L
H
X
X
Inputs
Output Y
OE1 OE2 A
L
H
Z
Z
X = Don’t Care
Z = High Impedance
FUNCTION TABLE

Sam4s ER-5200M Specifications

General

Brand	Sam4s
Model	ER-5200M
Category	Cash Register
Language	English