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Motorola Electronic Components Datasheet

MC6821 Datasheet

PERIPHERAL INTERFACE ADAPTER

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MC6821
PERIPHERAL INTERFACE ADAPTER (PIA)
The MC6821 Peripheral Interface Adapter provides the universal
means of interfacing peripheral equipment to the M6800 family of
microprocessors. This device is capable of interfacing the MPU to
peripherals through two 8-bit bidirectional peripheral data buses and
four control lines. No external logic is required for interfacing to most
peripheral devices.
The functional configuration of the PIA is programmed by the MPU
during system initialization. Each of the peripheral data lines can be pro-
grammed to act as an input or output, and each of the four con-
trol/interrupt lines may be programmed for one of several control
modes. This allows a high degree of flexibility in the overall operation of
the interface.
• 8-Bit Bidirectional Data Bus for Communication with the
MPU
• Two Bidirectional 8-Bit Buses for Interface to Peripherals
• Two Programmable Control Registers
• Two Programmable Data Direction Registers
• Four Individually-Controlled Interrupt Input Lines; Two
Usable as Peripheral Control Outputs
• Handshake Control Logic for Input and Output Peripheral
Operation
• High-Impedance Three-State and Direct Transistor Drive
Peripheral Lines
• Program Controlled Interrupt and Interrupt Disable Capability
• CMOS Drive Capability on Side A Peripheral Lines
• Two TTL Drive Capability on All A and B Side Buffers
• TTL-Compatible
• Static Operation
Package Type
Ceramic
L Suffix
Cerdip
S Suffix
Plastic
P Suffix
ORDERING INFORMATION
Frequency
{MHz)
1.0
1.0
1.5
1.5
2.0
1.0
1.0
1.5
1.5
2.0
1.0
1.0
1.5
1.5
2.0
Temperature
0°C to 70°C
- 40°C to 85°C
ooc to 70°C
- 40°C to 85°C
ooc to 70°C
ooc to 70°C
- 40°C to 85°C
ooc to 70°C
-40°C to 85°C
0°C to 70°C
ooc to 70°C
-40°C to85°C
0°C to 70°C
- 40°C to 85°C
ooc to 70°C
Order Number
MC6821 L
MC6821CL
MC68A21L
MC68A21CL
MC68B21 L
MC6821S
MC6821CS
MC68A21S
MC68A21CS
MC68B21S
MC6821 P
MC6821CP
MC68A21P
MC68A21CP
MC68B21 P
MOS
{N-CHANNEL, SILICON-GATE,
DEPLETION LOAD)
PERIPHERAL INTERFACE
ADAPTER
L SUFFIX
CERAMIC PACKAGE
CASE 715
P SUFFIX
PLASTIC PACKAGE
CASE 711
PIN ASSIGNMENT
PA1
PA3
PA4
PA6
PA7
PBO
PB2
PB3
PB4
PB5
PB6
PB7
CB1
CB2
Vee
CA1
CA2
IROA
IROB
RSO
RS1
RESET
DO
01
02
03
04
05
06
07
E
CS1
CS2
cso
R/W
©MOTOROLA INC., 1983
DS9435-R3


Motorola Electronic Components Datasheet

MC6821 Datasheet

PERIPHERAL INTERFACE ADAPTER

No Preview Available !

MC6821
MAXIMUM RATINGS
Characteristics
Supply Voltage
Input Voltage
Operating Temperature Range
MC6821 I MC68A21 I MC68821
MC6821C, MC68A21C
Storage Temperature Range
THERMAL CHARACTERISTICS
Characteristic
Thermal Resistance
Ceramic
Plastic
Cerdip
Symbol
Vee
Vin
TA
Tstg
Value
-0.3 to + 7.0
-0.3 to + 7.0
TL to TH
0 to 70
-40 to +85
-55 to + 150
Unit
v
v
oc
oc
Symbol
OJA
Value
50
100
60
Unit
°C/W
This device contains circuitry to protect the
inputs against damage due to high static
voltages or electric fields; however, it is ad-
vised that normal precautions be taken to
avoid applications of any voltage higher than
maximum rated voltages to this high-
impedance circuit. For proper operation it is
recommended that Vin and Vout be con-
strained to the range GNDs(Vin or
Voutl :S VCC.
Unused inputs must always be tied to an
appropriate logic voltage level (e.g., either
GND or Vccl.
POWER CONSIDERATIONS
The average chip-junction temperature, TJ, in °C can be obtained from:
TJ=TA+(Po•liJA)
Where:
( 1)
TA= Ambient Temperature, °C
liJA= Package Thermal Resistance, Junction-to-Ambient, °C/W
Po= PINT+ PPORT
PINT= Icc x Vee. Watts - Chip Internal Power
PpQRT= Port Power Dissipation, Watts - User Determined
For most applications PpQRT..C PiNT and can be neglected. PPORT may become significant if the device is configured to
drive Darlington bases or sink LED loads.
An approximate relationship between Po and TJ (if PpQRT is neglected) is:
Po= K + (TJ + 273°C)
(2)
Solving equations 1 and 2 for K gives:
K = Po•(TA+ 273°C) + 8JA•Po2
(3)
Where K is a constant pertaining to the particular part. K can be determined from equation 3 by measuring Po (at equilibrium)
for a known TA. Using this value of K the values of Po and TJ can be obtained by solving equations (1) and (2) iteratively for any
value ofT A·
DC ELECTRICAL CHARACTERISTICS 1Vcc=5.0 Vdc ±5%, Vss=O, TA=TL to TH unless otherwise noted).
I Characteristic
I Symbol I Min I Typ
BUS CONTROL INPUTS (R/W, Enable, RESET, RSO, RS1, CSO, CS1, CS2)
Input High Voltage
Input Low Voltage
Input Leakage Current (Vin = 0 to 5.25 Vl
Capacitance (Vjn =0, TA = 25°C, f= 1.0 MHz)
viH vss + 2.0 -
viL Vss-0.3 -
lin - 1.0
Cin - -
INTERRUPT OUTPUTS (IROA, IRQB)
Output Low Voltage (I Load= 1.6 mAl
Hi-Z Output Leakage Current
Capacitance (Vin=O, TA=25°C, f=1.0 MHz)
VoL - -
loz - 1.0
Cout
-
-
DATA BUS (00-07)
Input High Voltage
Input Low Voltage
Hi-Z Input Leakage Current (Vjn=0.4 to 2.4 Vl
Output High Voltage (!Load=- 205 p.A)
Output Low Voltage (I Load= 1.6 mAl
VIH
v,L
11z
I
l
VoH
VoL
Vss+2.o
Vss -0.3
-
Vss + 2.4
-
-
-
2.0
-
-
Capacitance (Vin=O, TA=25°C, f=1.0 MHz)
Cin - -
Max
Vee
Vss+o.a
2.5
7.5
Vss+0.4
10
5.0
Vee
Vss+o.a
10
I
I
-
vss+0.4
12.5
Unit
v
v
p.A
pF
v
p.A
pF
vI
vl
lp.A
v!
vI
pF I
.________ @ MOTOROLA Semiconductor Products Inc.
2


Part Number MC6821
Description PERIPHERAL INTERFACE ADAPTER
Maker Motorola
Total Page 12 Pages
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