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W78C31B Schematic ( PDF Datasheet ) - Winbond Electronics

Teilenummer W78C31B
Beschreibung 8-Bit Microcontroller
Hersteller Winbond Electronics
Logo Winbond Electronics Logo 




Gesamt 14 Seiten
W78C31B Datasheet, Funktion
www.DataSheet4U.com
W78C31B
8-BIT MICROCONTROLLER
GENERAL DESCRIPTION
The W78C31B microcontroller supplies a wider frequency range than most 8-bit microcontrollers on
the market. It is compatible with the industry standard 80C31 microcontroller series.
The W78C31B contains four 8-bit bidirectional parallel ports, two 16-bit timer/counters, and a serial
port. These peripherals are supported by a five-source, two-level interrupt capability. There are 128
bytes of RAM, and the device supports ROMless operation for application programs.
The W78C31B microcontroller has two power reduction modes, idle mode and power-down mode,
both of which are software selectable. The idle mode turns off the processor clock but allows for
continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power
consumption. The external clock can be stopped at any time and in any state without affecting the
processor.
FEATURES
8-bit CMOS microcontroller
Fully static design
Low standby current at full supply voltage
DC-40 MHz operation
128 bytes of on-chip scratchpad RAM
ROMless operation
64K bytes program memory address space
64K bytes data memory address space
Four 8-bit bidirectional ports
Two 16-bit timer/counters
One full duplex serial port
Boolean processor
Five-source, two-level interrupt capability
Built-in power management
Packages:
DIP 40: W78C31B-16/24/40
PLCC 44: W78C31BP-16/24/40
QFP 44: W78C31BF-16/24/40
TQFP 44: W78C31BM-16/24/40
Publication Release Date: October 1997
- 1 - Revision A3






W78C31B Datasheet, Funktion
www.DataSheet4U.com
W78C31B
During reset, the ports are initialized to FFH, the stack pointer to 07H, PCON (with the exception of
bit 4) to 00H, and all of the other SFR registers except SBUF to 00H. SBUF is not reset.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
MIN.
MAX.
UNIT
DC Power Supply
Input Voltage
Operating Temperature
Storage Temperature
VCCVSS
VIN
TA
TST
-0.3
VSS -0.3
0
-55
+7.0
VCC +0.3
70
+150
V
V
°C
°C
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of
the device.
DC CHARACTERISTICS
VCC-VSS = 5V ¡Ó 10%, TA = 25° C, FOSC = 20 MHz unless otherwise specified.
PARAMETER
SYMBOL TEST CONDITIONS
Operating Voltage
Operating Current
Idle Current
Power Down Current
Input Current P1, P3
Input Current RST (*2)
Input Leakage
Current P0 (*1)
Output Low Voltage
P1, P2 (*1), P3
Output Low Voltage ALE,
PSEN , PO(*1)
Output High Voltage
P1, P3
Output High Voltage
ALE, PSEN , P0 (*1), P2
(*1)
VDD
IDD
IIDLE
IPWDN
IIN1
IIN2
ILK
VOL1
VOL2
VOH1
VOH2
No load VDD = 5.5V
Idle mode VDD = 5.5V
Power-down mode
VDD = 5.5V
VDD = 5.5V
VIN = 0V or VDD
VDD = 5.5V
VIN = VDD
VDD = 5.5V
0V < VIN < VDD
VDD = 4.5V
IOL1 = +2 mA
VDD = 4.5V
IOL2 = +4 mA
VDD = 4.5V
IOH1 = -100 µA
VDD = 4.5V
IOH2 = -400 µA
SPECIFICATION
MIN. TYP. MAX.
4.5 5
5.5
--
30
--
6
--
50
-75 -
+10
- +184 +350
-10 -
+10
- - 0.45
- - 0.45
2.4 -
-
2.4 -
-
UNIT
V
mA
mA
µA
µA
µA
µA
V
V
V
V
-6-

6 Page









W78C31B pdf, datenblatt
www.DataSheet4U.com
Expanded External Data Memory and Oscillator
W78C31B
VCC
10 u OSCILLATOR
8.2 K
31
EA
19 XTAL1
18 XTAL2
9 RST
12 INT0
13 INT1
14 T0
15 T1
1 P1.0
2 P1.1
3 P1.2
4 P1.3
5 P1.4
6 P1.5
7 P1.6
8 P1.7
W78C31B
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
39 AD0
38 AD1
37 AD2
36 AD3
35 AD4
34 AD5
33 AD6
32 AD7
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
21 A8
22 A9
23 A10
24 A11
25 A12
26 A13
27 A14
28
RD
WR
PSEN
ALE
TXD
RXD
17
16
29
30
11
10
AD0 3 D0 Q0 2 A0
AD1 4 D1 Q1 5 A1
AD2 7 D2 Q2 6 A2
AD3 8 D3 Q3 9 A3
AD413 D4 Q4 12 A4
AD5 14 D5 Q5 15 A5
AD6 17 D6 Q6 16 A6
AD7 18 D7 Q7 19 A7
GND 1 OC
11 G
74LS373
A0 10
A1 9
A2 8
A3 7
A4 6
A5 5
A6 4
A7 3
A8 25
A9 24
A10 21
A11 23
A12 2
A13 26
A14 1
A0 D0 11
A1 D1 12
A2 D2 13
A3 D3 15
A4 D4 16
A5 D5 17
A6 D6 18
A7 D7 19
A8
A9
A10
A11
A12
A13
A14
GND20
22
27
CE
OE
WR
20256
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
PACKAGE DIMENSIONS
40-pin DIP
40
E1
1
S
A A2
L
D
B e1
B1
Figure B
21
20
A1 Base Plane
Seating Plane
a
E
eA
Symbol Dimension in inch Dimension in mm
Min. Nom. Max. Min. Nom. Max.
A 0.210
5.334
A 1 0.010
0.254
A 2 0.150 0.155 0.160 3.81 3.937 4.064
B 0.016 0.018 0.022 0.406 0.457 0.559
B 1 0.048 0.050 0.054 1.219 1.27 1.372
c 0.008 0.010 0.014 0.203 0.254 0.356
D 2.055 2.070
52.20 52.58
E 0.590 0.600 0.610 14.986 15.24 15.494
E 1 0.540 0.545 0.550 13.72 13.84 13.97
e 1 0.090 0.100 0.110 2.286 2.54 2.794
L 0.120 0.130 0.140 3.048 3.302 3.556
a0
15 0
15
e A 0.630 0.650 0.670 16.00 16.51 17.01
S 0.090
2.286
Notes:
1. Dimension D Max. & S include mold flash or
c tie bar burrs.
2. Dimension E1 does not include interlead flash.
3. Dimension D & E1 include mold mismatch and
are determined at the mo.ld 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.
- 12 -

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