W78E54
Typical Application Circuits, continued
Expanded External Data Memory and Oscillator
V
CC
V
CC
31
19
10
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
A0
A1
A2
A3
A4
A5
A6
A7
11
12
13
15
16
17
18
19
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD0
AD1
AD2
AD3
AD4
39 AD0
AD1
3
4
2
5
A0
A1
A2
A3
A4
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
D0 Q0
D1 Q1
D2 Q2
D3 Q3
D4 Q4
D5 Q5
D6 Q6
D7 Q7
D0
D1
D2
D3
D4
D5
D6
D7
EA
9
8
7
6
5
4
3
38
37 AD2
36 AD3
7
6
XTAL1
OSCILLATOR
10 u
8
13
9
12
15 A5
16
19 A7
AD4
35
18
9
AD5
34
AD5 14
XTAL2
33
32
A6
AD6
AD7
17
AD6
AD7 18
8.2 K
A8 25
A9 24
RST
INT0
GND
1
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
21
A8
A9
OC
G
11
21
23
2
26
1
A10
A11
A12
A13
A14
22
23
24
25
26
27
28
12
A10
A11
A12
A13
A14
13
14
15
74LS373
INT1
T0
T1
GND
CE
OE
20
22
27
1
2
3
4
5
6
7
8
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RD
17
WR
WR 16
29
20256
PSEN
30
11
10
ALE
TXD
RXD
W78E54
Figure B
PACKAGE DIMENSIONS
40-pin DIP
Dimension in inches
Dimension in mm
Symbol
Nom.
Nom.
Min.
Max.
0.210
Min.
Max.
5.334
A
A
A
B
B
c
0.010
0.150
0.016
0.048
0.008
0.254
3.81
1
2
0.155
0.018
0.050
0.010
2.055
0.160
0.022
0.054
0.014
2.070
0.610
3.937
0.457
1.27
4.064
0.559
1.372
0.356
52.58
15.494
13.97
2.794
0.406
1.219
0.203
1
0.254
52.20
15.24
13.84
2.54
D
D
E
E 1
40
21
0.590
0.540
0.090
0.600
0.545
0.100
14.986
13.72
2.286
0.550
0.110
e
L
a
1
0.140
15
3.048
0
3.302
E1
0.120
0
0.130
3.556
15
17.01
0.630
0.650
0.670
0.090
16.00
16.51
e A
S
2.286
20
1
Notes:
E
1. Dimension D Max. & S include mold flash or
tie bar burrs.
S
c
2. Dimension E1 does not include interlead flash.
3. Dimension D & E1 include mold mismatch and
are determined at the mold parting line.
4. Dimension B1 does not include dambar
protrusion/intrusion.
5. Controlling dimension: Inches.
6. General appearance spec. should be based on
final visual inspection spec.
2
A
A
L
A1
Base Plane
Seating Plane
.
B
B
e
1
A
e
a
1
Publication Release Date: November 1997
Revision A2
- 21 -
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