DATASHEET

82C55A
Data Sheet
December 8, 2015
FN2969.11
CMOS Programmable Peripheral Interface
Features
The Intersil 82C55A is a high performance CMOS version of
the industry standard 8255A and is manufactured using a
self-aligned silicon gate CMOS process (Scaled SAJI IV). It
is a general purpose programmable I/O device which may
be used with many different microprocessors. There are 24
I/O pins which may be individually programmed in 2 groups
of 12 and used in 3 major modes of operation. The high
performance and industry standard configuration of the
82C55A make it compatible with the 80C86, 80C88 and
other microprocessors.
• Pb-Free Plus Anneal Available (RoHS Compliant)
(See Ordering Info)
Static CMOS circuit design insures low operating power. TTL
compatibility over the full military temperature range and bus
hold circuitry eliminate the need for pull-up resistors. The
Intersil advanced SAJI process results in performance equal
to or greater than existing functionally equivalent products at
a fraction of the power.
• Enhanced Control Word Read Capability
• Pin Compatible with NMOS 8255A
• 24 Programmable I/O Pins
• Fully TTL Compatible
• High Speed, No “Wait State” Operation with 5MHz and
8MHz 80C86 and 80C88
• Direct Bit Set/Reset Capability
• L7 Process
• 2.5mA Drive Capability on All I/O Ports
• Low Standby Power (ICCSB) . . . . . . . . . . . . . . . . . . .10A
Ordering Information
PART NUMBERS
5MHz
PART
MARKING
8MHz
CP82C55A-5
(No longer available,
recommended
replacement:
CP82C55A-5Z)
CP82C55A-5
CP82C55A
CP82C55A-5Z (Note)
CP82C55A-5Z CP82C55AZ (Note)
IP82C55A
PART
MARKING
CP82C55A
CP82C55AZ
TEMP.
RANGE (°C)
PACKAGE
0 to +70
40 Ld PDIP
0 to +70
40 Ld PDIP (Pb-free)
IP82C55A
-40 to +85
IP82C55AZ (Note)
IP82C55AZ
-40 to +85
CS82C55A*
CS82C55A*
0 to +70
PKG. DWG. #
E40.6
40 Ld PDIP
40 Ld PDIP (Pb-free)
CS82C55A-5*
(No longer available,
recommended
replacement:
CS82C55A-5Z)
CS82C55A-5
CS82C55A-5Z* (Note)
CS82C55A-5Z CS82C55AZ* (Note) CS82C55AZ
IS82C55A-5*
IS82C55A-5
IS82C55A*
IS82C55A*
-40 to +85
44 Ld PLCC
IS82C55A-5Z* (Note)
IS82C55A-5Z
IS82C55AZ* (Note)
IS82C55AZ
-40 to +85
44 Ld PLCC (Pb-free)
CQ82C55AZ (Note)
CQ82C55AZ
0 to +70
44 Ld MQFP (Pb-free)
IQ82C55AZ* (Note)
IQ82C55AZ
-40 to +85
44 Ld MQFP (Pb-free)
ID82C55A
ID82C55A
-40 to +85
40 Ld CERDIP
F40.6
MD82C55A/B
MD82C55A/B
-55 to +125
8406602QA
8406602QA
SMD#
8406602XA
8406602XA
SMD#
44 Ld CLCC
J44.A
0 to +70
44 Ld PLCC
N44.65
44 Ld PLCC (Pb-free)
Q44.10x10
*Add “96” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination
finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pbfree peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2002, 2005, 2006, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
82C55A
Pinouts
WR
PA7
PA6
PA5
PA4
PA3
PA1
RD
CS
PA2
2 1 44 43 42 41 40
39 NC
38 RESET
37 D0
36 D1
35 D2
34 D3
33 D4
32 D5
31 D6
30 D7
29 NC
7
8
9
10
11
12
13
14
15
16
17
NC
VCC
PB7
PB6
PB5
PB4
PB3
WR
PA7
PA6
PA5
PA4
NC
PA3
PA1
RD
PA0
82C55A (MQFP)
TOP VIEW
RD
PA0
PA1
PA2
PA3
NC
PA4
PA5
PA6
PA7
WR
82C55A (PLCC)
TOP VIEW
PB2
18 19 20 21 22 23 24 25 26 27 28
PA2
13
14
15
16
17
18
19
20
6 5 4 3
GND
NC
A1
A0
PC7
PC6
PC5
PC4
PC0
PC1
PC2
PB1
31
30
29
28
27
26
25
24
23
22
21
PA4
PA5
PA6
PA7
WR
RESET
D0
D1
D2
D3
D4
D5
D6
D7
VCC
PB7
PB6
PB5
PB4
PB3
PB0
40
39
38
37
36
35
34
33
32
1
2
3
4
5
6
7
8
9
10
11
12
PC3
PA3
PA2
PA1
PA0
RD
CS
GND
A1
A0
PC7
PC6
PC5
PC4
PC0
PC1
PC2
PC3
PB0
PB1
PB2
82C55A (CLCC)
TOP VIEW
PA0
82C55A (PDIP, CERDIP)
TOP VIEW
6 5 4 3 2 1 44 43 42 41 40
44 43 42 41 40 39 38 37 36 35 34
33
2
32
RESET
A1
3
31
D1
A0
4
30
D2
PC7
5
29
D3
CS
GND
1
2
D0
9
25
D7
PC1
10
24
VCC
PC2
11
23
12 13 14 15 16 17 18 19 20 21 22
PB7
NC
D6
PC0
PB6
26
PB5
8
PB4
D5
PC4
PB3
D4
27
NC
28
7
PB2
6
PB1
PC6
PC5
NC
PB2
NC
PB3
PB4
PB5
PB6
PB7
18 1920 21 22 23 24 25 26 27 28
RESET
D0
D1
D2
D3
NC
D4
D5
D6
D7
VCC
PB0
39
38
37
36
35
34
33
32
31
30
29
PC3
7
8
9
10
11
12
13
14
15
16
17
PC2
PC3
PB0
PB1
CS
GND
A1
A0
PC7
NC
PC6
PC5
PC4
PC0
PC1
FN2969.11
December 8, 2015
82C55A
Pin Description
SYMBOL
TYPE
DESCRIPTION
VCC
VCC: The +5V power supply pin. A 0.1F capacitor between VCC and GND is recommended for decoupling.
GND
GROUND
D0-D7
I/O
DATA BUS: The Data Bus lines are bidirectional three-state pins connected to the system data bus.
RESET
I
RESET: A high on this input clears the control register and all ports (A, B, C) are set to the input mode with the “Bus
Hold” circuitry turned on.
CS
I
CHIP SELECT: Chip select is an active low input used to enable the 82C55A onto the Data Bus for CPU
communications.
RD
I
READ: Read is an active low input control signal used by the CPU to read status information or data via the data bus.
WR
I
WRITE: Write is an active low input control signal used by the CPU to load control words and data into the 82C55A.
A0-A1
I
ADDRESS: These input signals, in conjunction with the RD and WR inputs, control the selection of one of the three
ports or the control word register. A0 and A1 are normally connected to the least significant bits of the Address Bus
A0, A1.
PA0-PA7
I/O
PORT A: 8-bit input and output port. Both bus hold high and bus hold low circuitry are present on this port.
PB0-PB7
I/O
PORT B: 8-bit input and output port. Bus hold high circuitry is present on this port.
PC0-PC7
I/O
PORT C: 8-bit input and output port. Bus hold circuitry is present on this port.
Functional Diagram
+5V
POWER
SUPPLIES
GND
GROUP A
PORT A
(8)
GROUP A
CONTROL
GROUP A
PORT C
UPPER
(4)
BIDIRECTIONAL
DATA BUS
DATA BUS
BUFFER
D7-D0
8-BIT
INTERNAL
DATA BUS
RD
READ
WRITE
CONTROL
LOGIC
WR
A1
A0
GROUP B
CONTROL
GROUP B
PORT C
LOWER
(4)
GROUP B
PORT B
(8)
I/O
PA7-PA0
I/O
PC7-PC4
I/O
PC3-PC0
I/O
PB7-PB0
RESET
CS
3
FN2969.11
December 8, 2015
82C55A
Functional Description
Data Bus Buffer
This three-state bidirectional 8-bit buffer is used to interface
the 82C55A to the system data bus. Data is transmitted or
received by the buffer upon execution of input or output
instructions by the CPU. Control words and status
information are also transferred through the data bus buffer.
Read/Write and Control Logic
The function of this block is to manage all of the internal and
external transfers of both Data and Control or Status words.
It accepts inputs from the CPU Address and Control busses
and in turn, issues commands to both of the Control Groups.
(CS) Chip Select. A “low” on this input pin enables the
communication between the 82C55A and the CPU.
(RD) Read. A “low” on this input pin enables 82C55A to send
the data or status information to the CPU on the data bus. In
essence, it allows the CPU to “read from” the 82C55A.
(WR) Write. A “low” on this input pin enables the CPU to
write data or control words into the 82C55A.
(A0 and A1) Port Select 0 and Port Select 1. These input
signals, in conjunction with the RD and WR inputs, control
the selection of one of the three ports or the control word
register. They are normally connected to the least significant
bits of the address bus (A0 and A1).
82C55A BASIC OPERATION
INPUT OPERATION
(READ)
A1
A0
RD
WR
CS
0
0
0
1
0
Port A Data Bus
0
1
0
1
0
Port B Data Bus
1
0
0
1
0
Port C Data Bus
1
1
0
1
0
Control Word Data Bus
POWER
SUPPLIES
+5V
GND
BIDIRECTIONAL
DATA BUS
DATA
BUS
D7-D0
BUFFER
RD
WR
A1
A0
RESET
READ
WRITE
CONTROL
LOGIC
GROUP A
CONTROL
GROUP A
PORT A
(8)
GROUP A
PORT C
UPPER
(4)
8-BIT
INTERNAL
DATA BUS
GROUP B
CONTROL
GROUP B
PORT C
LOWER
(4)
GROUP B
PORT B
(8)
I/O
PA7PA0
I/O
PC7PC4
I/O
PC3PC0
I/O
PB7PB0
CS
FIGURE 1. 82C55A BLOCK DIAGRAM. DATA BUS BUFFER,
READ/WRITE, GROUP A & B CONTROL LOGIC
FUNCTIONS
Group A and Group B Controls
The functional configuration of each port is programmed by
the systems software. In essence, the CPU “outputs” a
control word to the 82C55A. The control word contains
information such as “mode”, “bit set”, “bit reset”, etc., that
initializes the functional configuration of the 82C55A.
Each of the Control blocks (Group A and Group B) accepts
“commands” from the Read/Write Control logic, receives
“control words” from the internal data bus and issues the
proper commands to its associated ports.
Control Group A - Port A and Port C upper (C7 - C4)
Control Group B - Port B and Port C lower (C3 - C0)
0
0
1
0
0
Data Bus Port A
The control word register can be both written and read as
shown in the “Basic Operation” table. Figure 4 shows the
control word format for both Read and Write operations.
When the control word is read, bit D7 will always be a logic
“1”, as this implies control word mode information.
0
1
1
0
0
Data Bus Port B
Ports A, B, and C
1
0
1
0
0
Data Bus Port C
1
1
1
0
0
Data Bus Control
OUTPUT OPERATION
(WRITE)
DISABLE FUNCTION
X
X
X
X
1
Data Bus Three-State
X
X
1
1
0
Data Bus Three-State
(RESET) Reset. A “high” on this input initializes the control
register to 9Bh and all ports (A, B, C) are set to the input
mode. “Bus hold” devices internal to the 82C55A will hold
the I/O port inputs to a logic “1” state with a maximum hold
current of 400A.
4
The 82C55A contains three 8-bit ports (A, B, and C). All can
be configured to a wide variety of functional characteristics
by the system software but each has its own special features
or “personality” to further enhance the power and flexibility of
the 82C55A.
Port A One 8-bit data output latch/buffer and one 8-bit data
input latch. Both “pull-up” and “pull-down” bus-hold devices
are present on Port A. See Figure 2A.
Port B One 8-bit data input/output latch/buffer and one 8-bit
data input buffer. See Figure 2B.
Port C One 8-bit data output latch/buffer and one 8-bit data
input buffer (no latch for input). This port can be divided into
FN2969.11
December 8, 2015
82C55A
two 4-bit ports under the mode control. Each 4-bit port
contains a 4-bit latch and it can be used for the control signal
output and status signal inputs in conjunction with ports A
and B. See Figure 2B.
ADDRESS BUS
CONTROL BUS
DATA BUS
INPUT MODE
MASTER
RESET
OR MODE
CHANGE
RD, WR
INTERNAL
DATA IN
EXTERNAL
PORT A PIN
MODE 0
INTERNAL
DATA OUT
(LATCHED)
I/O
PB7-PB0
MODE 1
VCC
RESET
OR MODE
CHANGE
EXTERNAL
PORT B, C
PIN
INTERNAL
DATA OUT
(LATCHED)
FIGURE 2B. PORT B AND C BUS-HOLD CONFIGURATION
4
I/O
PC7-PC4
I/O
8
CONTROL CONTROL
OR I/O
OR I/O
C
I/O
PA7-PA0
A
8
I/O
PA7-PA0
A
BIDIRECTIONAL
I/O
PB7-PB0
OUTPUT MODE
I/O
PC3-PC0
B
8
A
C
PB7-PB0
MODE 2
4
B
8
P
INTERNAL
DATA IN
A0-A1
CS
C
B
8
OUTPUT MODE
FIGURE 2A. PORT A BUS-HOLD CONFIGURATION
D7-D0
82C55A
CONTROL
PA7-PA0
FIGURE 3. BASIC MODE DEFINITIONS AND BUS INTERFACE
FIGURE 2. BUS-HOLD CONFIGURATION
Operational Description
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
GROUP B
Mode Selection
There are three basic modes of operation than can be
selected by the system software:
Mode 0 - Basic Input/Output
Mode 1 - Strobed Input/Output
Mode 2 - Bidirectional Bus
When the reset input goes “high”, all ports will be set to the
input mode with all 24 port lines held at a logic “one” level by
internal bus hold devices. After the reset is removed, the
82C55A can remain in the input mode with no additional
initialization required. This eliminates the need to pull-up or
pull-down resistors in all-CMOS designs. The control word
register will contain 9Bh. During the execution of the system
program, any of the other modes may be selected using a
single output instruction. This allows a single 82C55A to
service a variety of peripheral devices with a simple software
maintenance routine. Any port programmed as an output
port is initialized to all zeros when the control word is written.
PORT C (LOWER)
1 = INPUT
0 = OUTPUT
PORT B
1 = INPUT
0 = OUTPUT
MODE SELECTION
0 = MODE 0
1 = MODE 1
GROUP A
PORT C (UPPER)
1 = INPUT
0 = OUTPUT
PORT A
1 = INPUT
0 = OUTPUT
MODE SELECTION
00 = MODE 0
01 = MODE 1
1X = MODE 2
MODE SET FLAG
1 = ACTIVE
FIGURE 4. MODE DEFINITION FORMAT
5
FN2969.11
December 8, 2015
82C55A
The modes for Port A and Port B can be separately defined,
while Port C is divided into two portions as required by the
Port A and Port B definitions. All of the output registers,
including the status flip-flops, will be reset whenever the
mode is changed. Modes may be combined so that their
functional definition can be “tailored” to almost any I/O
structure. For instance: Group B can be programmed in
Mode 0 to monitor simple switch closings or display
computational results, Group A could be programmed in
Mode 1 to monitor a keyboard or tape reader on an interruptdriven basis.
This function allows the programmer to enable or disable a
CPU interrupt by a specific I/O device without affecting any
other device in the interrupt structure.
The mode definitions and possible mode combinations may
seem confusing at first, but after a cursory review of the
complete device operation a simple, logical I/O approach will
surface. The design of the 82C55A has taken into account
things such as efficient PC board layout, control signal
definition vs. PC layout and complete functional flexibility to
support almost any peripheral device with no external logic.
Such design represents the maximum use of the available
pins.
Mode 0 (Basic Input/Output). This functional configuration
provides simple input and output operations for each of the
three ports. No handshaking is required, data is simply
written to or read from a specific port.
INTE Flip-Flop Definition
(BIT-SET)-INTE is SET - Interrupt Enable
(BIT-RESET)-INTE is Reset - Interrupt Disable
NOTE: All Mask flip-flops are automatically reset during mode
selection and device Reset.
Operating Modes
Mode 0 Basic Functional Definitions:
• Two 8-bit ports and two 4-bit ports
• Any Port can be input or output
• Outputs are latched
Single Bit Set/Reset Feature (Figure 5)
Any of the eight bits of Port C can be Set or Reset using a
single Output instruction. This feature reduces software
requirements in control-based applications.
• Inputs are not latched
• 16 different Input/Output configurations possible
MODE 0 PORT DEFINITION
When Port C is being used as status/control for Port A or B,
these bits can be set or reset by using the Bit Set/Reset
operation just as if they were output ports.
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
X
X
BIT SET/RESET
1 = SET
0 = RESET
X
DON’T
CARE
BIT SELECT
0 1 2 3 4
0 1 0 1 0
0 0 1 1 0
0 0 0 0 1
5
1
0
1
6
0
1
1
7
1 B0
1 B1
1 B2
BIT SET/RESET FLAG
0 = ACTIVE
FIGURE 5. BIT SET/RESET FORMAT
Interrupt Control Functions
When the 82C55A is programmed to operate in mode 1 or
mode 2, control signals are provided that can be used as
interrupt request inputs to the CPU. The interrupt request
signals, generated from port C, can be inhibited or enabled
by setting or resetting the associated INTE flip-flop, using
the bit set/reset function of port C.
6
A
B
GROUP A
PORT C
PORT A (Upper)
GROUP B
#
PORT C
PORT B (Lower)
D4
D3
D1
D0
0
0
0
0
Output
Output
0
Output
Output
0
0
0
1
Output
Output
1
Output
Input
0
0
1
0
Output
Output
2
Input
Output
0
0
1
1
Output
Output
3
Input
Input
0
1
0
0
Output
Input
4
Output
Output
0
1
0
1
Output
Input
5
Output
Input
0
1
1
0
Output
Input
6
Input
Output
0
1
1
1
Output
Input
7
Input
Input
1
0
0
0
Input
Output
8
Output
Output
1
0
0
1
Input
Output
9
Output
Input
1
0
1
0
Input
Output
10
Input
Output
1
0
1
1
Input
Output
11
Input
Input
1
1
0
0
Input
Input
12
Output
Output
1
1
0
1
Input
Input
13
Output
Input
1
1
1
0
Input
Input
14
Input
Output
1
1
1
1
Input
Input
15
Input
Input
FN2969.11
December 8, 2015
82C55A
Mode 0 (Basic Input)
tRR
RD
tIR
tHR
INPUT
tAR
tRA
CS, A1, A0
D7-D0
tRD
tDF
Mode 0 (Basic Output)
tWW
WR
tWD
tDW
D7-D0
tAW
tWA
CS, A1, A0
OUTPUT
tWB
Mode 0 Configurations
CONTROL WORD #0
CONTROL WORD #2
D7 D6 D5 D4 D3 D2 D1 D0
1
0
0
0
0
0
0
A
82C55A
1
8
4
C
D7 - D0
D7 D6 D5 D4 D3 D2 D1 D0
0
4
B
8
0
0
0
0
1
0
A
4
PC7 - PC4
C
D7 - D0
4
PC3 - PC0
PB7 - PB0
8
B
8
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
CONTROL WORD #3
0
0
0
D7 D6 D5 D4 D3 D2 D1 D0
1
A
82C55A
D7 - D0
0
82C55A
D7 D6 D5 D4 D3 D2 D1 D0
0
0
PA7 - PA0
CONTROL WORD #1
1
0
8
4
C
4
B
7
1
8
0
0
0
0
0
1
1
PA7 - PA0
A
82C55A
4
PC7 - PC4
D7 - D0
C
4
PC3 - PC0
PB7 - PB0
8
B
8
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
FN2969.11
December 8, 2015
82C55A
Mode 0 Configurations (Continued)
CONTROL WORD #4
CONTROL WORD #8
D7 D6 D5 D4 D3 D2 D1 D0
1
0
0
0
1
0
0
A
82C55A
1
8
4
C
D7 - D0
D7 D6 D5 D4 D3 D2 D1 D0
0
4
B
8
0
0
1
0
0
PB7 - PB0
8
1
0
1
8
PC7 - PC4
PC3 - PC0
PB7 - PB0
0
1
0
0
0
1
A
4
PC7 - PC4
C
D7 - D0
4
PC3 - PC0
PB7 - PB0
8
B
8
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
D7 D6 D5 D4 D3 D2 D1 D0
1
8
4
C
D7 - D0
4
B
8
0
0
1
0
0
1
0
PA7 - PA0
A
82C55A
C
D7 - D0
4
PC3 - PC0
PB7 - PB0
8
4
PC7 - PC4
CONTROL WORD #7
B
8
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
CONTROL WORD #11
D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
D7 D6 D5 D4 D3 D2 D1 D0
1
A
82C55A
D7 - D0
0
82C55A
0
82C55A
0
8
PA7 - PA0
CONTROL WORD #10
A
0
4
B
PA7 - PA0
D7 D6 D5 D4 D3 D2 D1 D0
0
C
D7 - D0
8
4
PC3 - PC0
CONTROL WORD #6
1
0
A
1
4
B
0
0
D7 D6 D5 D4 D3 D2 D1 D0
4
C
D7 - D0
0
0
PC7 - PC4
1
82C55A
0
0
CONTROL WORD #9
A
1
1
82C55A
D7 D6 D5 D4 D3 D2 D1 D0
0
0
PA7 - PA0
CONTROL WORD #5
1
0
8
4
C
4
B
8
1
8
0
0
1
0
0
1
1
PA7 - PA0
A
82C55A
4
PC7 - PC4
D7 - D0
C
4
PC3 - PC0
PB7 - PB0
8
B
8
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
FN2969.11
December 8, 2015
82C55A
Mode 0 Configurations (Continued)
CONTROL WORD #12
CONTROL WORD #14
D7 D6 D5 D4 D3 D2 D1 D0
1
0
0
1
1
0
0
A
82C55A
1
8
4
C
D7 - D0
D7 D6 D5 D4 D3 D2 D1 D0
0
4
B
8
0
1
1
1
0
1
0
8
A
82C55A
4
PC7 - PC4
C
D7 - D0
4
PC3 - PC0
PB7 - PB0
8
B
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
CONTROL WORD #15
D7 D6 D5 D4 D3 D2 D1 D0
0
0
PA7 - PA0
CONTROL WORD #13
1
0
1
0
0
1
A
82C55A
1
8
4
C
D7 - D0
D7 D6 D5 D4 D3 D2 D1 D0
4
B
8
0
0
1
1
0
1
1
PA7 - PA0
8
A
82C55A
4
PC7 - PC4
C
D7 - D0
4
PC3 - PC0
PB7 - PB0
Operating Modes
Mode 1 - (Strobed Input/Output). This functional
configuration provides a means for transferring I/O data to or
from a specified port in conjunction with strobes or “hand
shaking” signals. In mode 1, port A and port B use the lines
on port C to generate or accept these “hand shaking”
signals.
8
B
PA7 - PA0
PC7 - PC4
PC3 - PC0
PB7 - PB0
MODE 1 (PORT A)
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
1
1/0
INTE
A
PC6, PC7
1 = INPUT
0 = OUTPUT
Mode 1 Basic Function Definitions:
8
PA7-PA0
PC4
STBA
PC5
IBFA
INTRA
PC3
• Two Groups (Group A and Group B)
RD
PC6, PC7
2
I/O
• Each group contains one 8-bit port and one 4-bit
control/data port
• The 8-bit data port can be either input or output. Both
inputs and outputs are latched.
• The 4-bit port is used for control and status of the 8-bit port.
Input Control Signal Definition
MODE 1 (PORT B)
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
1
1
PB7-PB0
INTE
B
PC2
8
STBB
PC1
IBFB
PC0
INTRB
(Figures 6 and 7)
STB (Strobe Input)
A “low” on this input loads data into the input latch.
RD
IBF (Input Buffer Full F/F)
A “high” on this output indicates that the data has been
loaded into the input latch: in essence, an acknowledgment.
IBF is set by STB input being low and is reset by the rising
edge of the RD input.
9
FIGURE 6. MODE 1 INPUT
FN2969.11
December 8, 2015
82C55A
tST
STB
tSIB
IBF
tSIT
tRIB
INTR
tRIT
RD
tPH
INPUT FROM
PERIPHERAL
tPS
FIGURE 7. MODE 1 (STROBED INPUT)
INTR (Interrupt Request)
INTE A
A “high” on this output can be used to interrupt the CPU
when an input device is requesting service. INTR is set by
the condition: STB is a “one”, IBF is a “one” and INTE is a
“one”. It is reset by the falling edge of RD. This procedure
allows an input device to request service from the CPU by
simply strobing its data into the port.
Controlled by Bit Set/Reset of PC6.
INTE A
Controlled by bit set/reset of PC4.
INTE B
INTE B
Controlled by Bit Set/Reset of PC2.
NOTE:
1. To strobe data into the peripheral device, the user must operate
the strobe line in a hand shaking mode. The user needs to send
OBF to the peripheral device, generates an ACK from the
peripheral device and then latch data into the peripheral device
on the rising edge of OBF.
Controlled by bit set/reset of PC2.
Output Control Signal Definition
(Figure 8 and 9)
OBF - (Output Buffer Full F/F). The OBF output will go “low”
to indicate that the CPU has written data out to the specified
port. This does not mean valid data is sent out of the port at
this time since OBF can go true before data is available.
Data is guaranteed valid at the rising edge of OBF, (See
Note 1). The OBF F/F will be set by the rising edge of the
WR input and reset by ACK input being low.
ACK - (Acknowledge Input). A “low” on this input informs the
82C55A that the data from Port A or Port B is ready to be
accepted. In essence, a response from the peripheral device
indicating that it is ready to accept data, (See Note 1).
INTR - (Interrupt Request). A “high” on this output can be
used to interrupt the CPU when an output device has
accepted data transmitted by the CPU. INTR is set when
ACK is a “one”, OBF is a “one” and INTE is a “one”. It is reset
by the falling edge of WR.
MODE 1 (PORT A)
PA7-PA0
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
1
1/0
PC4, PC5
1 = INPUT
0 = OUTPUT
INTE
A
8
PC7
OBFA
PC6
ACKA
INTRA
PC3
WR
PC4, PC5
2
MODE 1 (PORT B)
PB7-PB0
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
1
0
INTE
B
8
PC1
OBFB
PC2
ACKB
PC0
INTRB
WR
FIGURE 8. MODE 1 OUTPUT
10
FN2969.11
December 8, 2015
82C55A
tWOB
WR
tAOB
OBF
INTR
tWIT
ACK
tAK
tAIT
OUTPUT
tWB
FIGURE 9. MODE 1 (STROBED OUTPUT)
8
PA7-PA0
RD
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
1
1/0
1
0
PC6, PC7
1 = INPUT
0 = OUTPUT
PC4
STBA
PC5
IIBFA
PC3
INTRA
PC6, PC7
2
PB7, PB0
WR
PA7-PA0
WR
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
0
1/0
I/O
1
PC7
OBFA
PC6
ACKA
INTRA
PC3
1
PC4, PC5
1 = INPUT
0 = OUTPUT
8
8
PC4, PC5
PB7, PB0
2
I/O
8
PC1
OBFB
PC2
STBB
PC2
ACKB
PC1
IBFB
PC0
INTRB
PC0
INTRB
RD
PORT A - (STROBED INPUT)
PORT B - (STROBED OUTPUT)
PORT A - (STROBED OUTPUT)
PORT B - (STROBED INPUT)
Combinations of Mode 1: Port A and Port B can be individually defined as input or output in Mode 1 to support a wide variety of strobed I/O applications.
FIGURE 10. COMBINATIONS OF MODE 1
Operating Modes
Output Operations
Mode 2 (Strobed Bidirectional Bus I/O)
OBF - (Output Buffer Full). The OBF output will go “low” to
indicate that the CPU has written data out to port A.
This functional configuration provides a means for
communicating with a peripheral device or structure on a
single 8-bit bus for both transmitting and receiving data
(bidirectional bus I/O). “Hand shaking” signals are provided to
maintain proper bus flow discipline similar to Mode 1. Interrupt
generation and enable/disable functions are also available.
Mode 2 Basic Functional Definitions:
• Used in Group A only
• One 8-bit, bidirectional bus Port (Port A) and a 5-bit
control Port (Port C)
• Both inputs and outputs are latched
• The 5-bit control port (Port C) is used for control and
status for the 8-bit, bidirectional bus port (Port A)
Bidirectional Bus I/O Control Signal Definition
ACK - (Acknowledge). A “low” on this input enables the threestate output buffer of port A to send out the data. Otherwise,
the output buffer will be in the high impedance state.
INTE 1 - (The INTE flip-flop associated with OBF).
Controlled by bit set/reset of PC4.
Input Operations
STB - (Strobe Input). A “low” on this input loads data into the
input latch.
IBF - (Input Buffer Full F/F). A “high” on this output indicates
that data has been loaded into the input latch.
INTE 2 - (The INTE flip-flop associated with IBF). Controlled
by bit set/reset of PC4.
(Figures 11, 12, 13, 14)
INTR - (Interrupt Request). A high on this output can be
used to interrupt the CPU for both input or output operations.
11
FN2969.11
December 8, 2015
82C55A
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
1
INTRA
PC3
1/0 1/0 1/0
PA7-PA0
PC2-PC0
1 = INPUT
0 = OUTPUT
PORT B
1 = INPUT
0 = OUTPUT
8
PC7
OBFA
INTE
1
PC6
ACKA
INTE
2
PC4
STBA
PC5
IBFA
WR
GROUP B MODE
0 = MODE 0
1 = MODE 1
PC2-PC0
RD
FIGURE 11. MODE CONTROL WORD
3
I/O
FIGURE 12. MODE 2
DATA FROM
CPU TO 82C55A
WR
tAOB
OBF
tWOB
INTR
tAK
ACK
tST
STB
tSIB
IBF
tAD
tPS
tKD
PERIPHERAL
BUS
tRIB
tPH
RD
DATA FROM
PERIPHERAL TO 82C55A
DATA FROM
82C55A TO PERIPHERAL
DATA FROM
82C55A TO CPU
NOTE: Any sequence where WR occurs before ACK and STB occurs before RD is permissible. (INTR = IBF  MASK  STB  RD + OBF  MASK
 ACK  WR)
FIGURE 13. MODE 2 (BIDIRECTIONAL)
12
FN2969.11
December 8, 2015
82C55A
MODE 2 AND MODE 0 (INPUT)
MODE 2 AND MODE 0 (OUTPUT)
PC3
PA7-PA0
1
1
0
1
1/0
PC2-PC0
1 = INPUT
0 = OUTPUT
PA7-PA0
8
OBFA
PC7
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
PC6
ACKA
PC4
STBA
PC5
IBFA
PC2-PC0
PC3
INTRA
3
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
1
I/O
PB7-PB0
PC7
OBFA
PC6
ACKA
PC4
STBA
IBFA
PC5
PC2-PC0
PB7, PB0
8
3
I/O
8
WR
MODE 2 AND MODE 1 (OUTPUT)
MODE 2 AND MODE 1 (INPUT)
PC3
PA7-PA0
0
OBFA
ACKA
PC4
STBA
PC5
IBFA
PC1
RD
WR
PA7-PA0
8
PC6
PB7-PB0
PC3
INTRA
PC7
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
1/0
8
RD
WR
1
0
PC2-PC0
1 = INPUT
0 = OUTPUT
RD
1
0
INTRA
CONTROL WORD
D7 D6 D5 D4 D3 D2 D1 D0
1
1
1
1
8
PC7
OBFA
PC6
ACKA
PC4
STBA
PC5
IBFA
PB7-PB0
8
OBFB
PC2
ACKB
PC0
INTRB
RD
WR
INTRA
8
PC2
STBB
PC1
IBFB
PC0
INTRB
FIGURE 14. MODE 2 COMBINATIONS
13
FN2969.11
December 8, 2015
82C55A
MODE DEFINITION SUMMARY
MODE 0
MODE 1
MODE 2
IN
OUT
IN
OUT
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Out
Out
Out
Out
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Out
Out
Out
Out
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Out
Out
Out
Out
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Out
Out
Out
Out
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Out
Out
Out
Out
INTRB
IBFB
STBB
INTRA
STBA
IBFA
I/O
I/O
INTRB
OBFB
ACKB
INTRA
I/O
I/O
ACKA
OBFA
Special Mode Combination Considerations
There are several combinations of modes possible. For any
combination, some or all of Port C lines are used for control
or status. The remaining bits are either inputs or outputs as
defined by a “Set Mode” command.
During a read of Port C, the state of all the Port C lines,
except the ACK and STB lines, will be placed on the data
bus. In place of the ACK and STB line states, flag status will
appear on the data bus in the PC2, PC4, and PC6 bit
positions as illustrated by Figure 17.
Through a “Write Port C” command, only the Port C pins
programmed as outputs in a Mode 0 group can be written.
No other pins can be affected by a “Write Port C” command,
nor can the interrupt enable flags be accessed. To write to
any Port C output programmed as an output in Mode 1
group or to change an interrupt enable flag, the “Set/Reset
Port C Bit” command must be used.
With a “Set/Reset Port C Bit” command, any Port C line
programmed as an output (including IBF and OBF) can be
written, or an interrupt enable flag can be either set or reset.
Port C lines programmed as inputs, including ACK and STB
lines, associated with Port C are not affected by a “Set/Reset
Port C Bit” command. Writing to the corresponding Port C bit
positions of the ACK and STB lines with the “Set Reset Port
C Bit” command will affect the Group A and Group B
interrupt enable flags, as illustrated in Figure 17.
GROUP A ONLY
Mode 0
or Mode 1
Only
I/O
I/O
I/O
INTRA
STBA
IBFA
ACKA
OBFA
INPUT CONFIGURATION
D7
D6
D5
I/O
I/O
IBFA
D4
D3
D2
INTEA INTRA INTEB
GROUP A
D1
D0
IBFB
INTRB
GROUP B
OUTPUT CONFIGURATION
D7
D6
OBFA INTEA
D5
D4
I/O
I/O
D3
D2
D1
D0
INTRA INTEB OBFB INTRB
GROUP A
GROUP B
FIGURE 15. MODE 1 STATUS WORD FORMAT
D7
D6
OBFA INTE1
D5
IBFA
D4
D3
INTE2 INTRA
GROUP A
D2
D1
D0
X
X
X
GROUP B
(Defined by Mode 0 or Mode 1 Selection)
FIGURE 16. MODE 2 STATUS WORD FORMAT
Current Drive Capability
Any output on Port A, B or C can sink or source 2.5mA. This
feature allows the 82C55A to directly drive Darlington type
drivers and high-voltage displays that require such sink or
source current.
Reading Port C Status (Figures 15 and 16)
In Mode 0, Port C transfers data to or from the peripheral
device. When the 82C55A is programmed to function in
14
FN2969.11
December 8, 2015
82C55A
Modes 1 or 2, Port C generates or accepts “hand shaking”
signals with the peripheral device. Reading the contents of
Port C allows the programmer to test or verify the “status” of
each peripheral device and change the program flow
accordingly.
There is not a special instruction to read the status
information from Port C. A normal read operation of Port C is
executed to perform this function.
INTERRUPT
ENABLE FLAG
POSITION
ALTERNATE PORT C
PIN SIGNAL (MODE)
INTE B
PC2
ACKB (Output Mode 1)
or STBB (Input Mode 1)
INTE A2
PC4
STBA (Input Mode 1 or Mode
2)
INTE A1
PC6
ACKA (Output Mode 1 or
Mode 2)
FIGURE 17. INTERRUPT ENABLE FLAGS IN MODES 1 AND 2
Applications of the 82C55A
The 82C55A is a very powerful tool for interfacing peripheral
equipment to the microcomputer system. It represents the
optimum use of available pins and is flexible enough to
interface almost any I/O device without the need for
additional external logic.
Each peripheral device in a microcomputer system usually
has a “service routine” associated with it. The routine
manages the software interface between the device and the
CPU. The functional definition of the 82C55A is programmed
by the I/O service routine and becomes an extension of the
system software. By examining the I/O devices interface
characteristics for both data transfer and timing, and
matching this information to the examples and tables in the
detailed operational description, a control word can easily be
developed to initialize the 82C55A to exactly “fit” the
application. Figures 18 through 24 present a few examples
of typical applications of the 82C55A.
INTERRUPT
REQUEST
PC3
MODE 1
(OUTPUT)
82C55A
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PC7
PC6
PC5
PC4
HIGH SPEED
PRINTER
HAMMER
RELAYS
DATA READY
ACK
PAPER FEED
FORWARD/REV.
PB0
PB1
PB2
PB3
PB4
MODE 1 PB5
(OUTPUT) PB6
PB7
PC1
PC2
PAPER FEED
FORWARD/REV.
RIBBON
CARRIAGE SEN.
DATA READY
ACK
PC0
INTERRUPT
REQUEST
CONTROL LOGIC
AND DRIVERS
FIGURE 18. PRINTER INTERFACE
15
FN2969.11
December 8, 2015
82C55A
INTERRUPT
REQUEST
PC3
MODE 1
(INPUT)
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
R0
R1
R2
FULLY
R3
DECODED
R4
KEYBOARD
R5
SHIFT
CONTROL
PC4
PC5
STROBE
ACK
INTERRUPT
REQUEST
PC3
MODE 1
(INPUT)
82C55A
PB0
PB1
PB2
PB3
PB4
MODE 1 PB5
(OUTPUT) PB6
PB7
B0
B1
B2
BURROUGHS
SELF-SCAN
B3
DISPLAY
B4
B5
BACKSPACE
CLEAR
MODE 0
(INPUT)
DATA READY
ACK
BLANKING
CANCEL WORD
PC1
PC2
PC6
PC7
82C55A
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
R0
R1
R2
FULLY
R3
DECODED
R4
KEYBOARD
R5
SHIFT
CONTROL
PC4
PC5
PC6
PC7
STROBE
ACK
BUST LT
TEST LT
TERMINAL
ADDRESS
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
INTERRUPT
REQUEST
FIGURE 19. KEYBOARD AND DISPLAY INTERFACE
FIGURE 20. KEYBOARD AND TERMINAL ADDRESS
INTERFACE
INTERRUPT
REQUEST
PA0
PA1
PA2
PA3
PA4
MODE 0 PA5
(OUTPUT) PA6
PA7
PC4
PC5
PC6
PC7
82C55A
PC0
PC1
BIT
SET/RESET PC2
PC3
PB0
PB1
PB2
MODE 0
(INPUT)
PB3
PB4
PB5
PB6
PB7
LSB
PC3
12-BIT
D/A
CONVERTER
(DAC)
ANALOG
OUTPUT
PA0
PA1
PA2
PA3
PA4
PA5
MODE 1 PA6
(OUTPUT)
PA7
MSB
82C55A
STB DATA
SAMPLE EN
STB
LSB
8-BIT
A/D
CONVERTER
(ADC)
ANALOG
INPUT
MSB
FIGURE 21. DIGITAL TO ANALOG, ANALOG TO DIGITAL
16
R0
R1
R2
CRT CONTROLLER
R3
² CHARACTER GEN.
² REFRESH BUFFER
R4
² CURSOR CONTROL
R5
SHIFT
CONTROL
PC7
PC6
PC5
PC4
DATA READY
ACK
BLANKED
BLACK/WHITE
PC2
PC1
PC0
ROW STB
COLUMN STB
CURSOR H/V STB
PB0
MODE 0 PB1
(OUTPUT) PB2
PB3
PB4
PB5
PB6
PB7
CURSOR/ROW/COLUMN
ADDRESS
H&V
FIGURE 22. BASIC CRT CONTROLLER INTERFACE
FN2969.11
December 8, 2015
82C55A
INTERRUPT
REQUEST
INTERRUPT
REQUEST
PC3
MODE 2
82C55A
PC3
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
D0
D1
D2
D3
D4
D5
D6
D7
PC4
PC5
PC7
PC6
DATA STB
ACK (IN)
DATA READY
ACK (OUT)
PC2
PC1
PC0
TRACK “0” SENSOR
SYNC READY
INDEX
PB0
PB1
PB2
MODE 0 PB3
(OUTPUT) PB4
PB5
PB6
PB7
FLOPPY DISK
CONTROLLER
AND DRIVE
ENGAGE HEAD
FORWARD/REV.
READ ENABLE
WRITE ENABLE
DISC SELECT
ENABLE CRC
TEST
BUSY LT
FIGURE 23. BASIC FLOPPY DISC INTERFACE
17
MODE 1
(INPUT)
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
R0
R1
R2
R3
R4
R5
R6
R7
PC4
PC5
PC6
STB
ACK
STOP/GO
MACHINE TOOL
82C55A
MODE 0
(INPUT)
B LEVEL
PAPER
TAPE
READER
PC0
PC1
PC2
PB0
PB1
PB2
MODE 0 PB3
(OUTPUT) PB4
PB5
PB6
PB7
START/STOP
LIMIT SENSOR (H/V)
OUT OF FLUID
CHANGE TOOL
LEFT/RIGHT
UP/DOWN
HOR. STEP STROBE
VERT. STEP STROBE
SLEW/STEP
FLUID ENABLE
EMERGENCY STOP
FIGURE 24. MACHINE TOOL CONTROLLER INTERFACE
FN2969.11
December 8, 2015
82C55A
Absolute Maximum Ratings TA = +25°C
Thermal Information
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8.0V
Input, Output or I/O Voltage . . . . . . . . . . . . . GND-0.5V to VCC+0.5V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 1
Thermal Resistance (Typical, Note 1)
Operating Conditions
Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.5V to 5.5V
Operating Temperature Range
CX82C55A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
IX82C55A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 85°C
MX82C55A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-55°C to 125°C
Die Characteristics
JA (°C/W)
JC(°C/W)
CERDIP Package. . . . . . . . . . . . . . . . .
50
10
CLCC Package . . . . . . . . . . . . . . . . . .
65
14
PDIP Package . . . . . . . . . . . . . . . . . . .
50
N/A
PLCC Package. . . . . . . . . . . . . . . . . . .
55
N/A
MQFP Package . . . . . . . . . . . . . . . . . .
62
N/A
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Junction Temperature
CDIP Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +175°C
PDIP Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C
(PLCC and MQFP Lead Tips Only)
Gate Count. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 Gates
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. JA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
SYMBOL
VCC = 5.0V ±10%; TA = Operating Temperature Range
PARAMETER
TEST CONDITIONS
MIN
MAX
UNITS
VIH
Logical One Input Voltage
2.0
2.2
-
V
VIL
Logical Zero Input Voltage
-
0.8
V
3.0
VCC -0.4
-
V
-
0.4
V
VOH
Logical One Output Voltage
IOH = -2.5mA,
IOH = -100A
VOL
Logical Zero Output Voltage
IOL +2.5mA
II
Input Leakage Current
VIN = VCC or GND, RD, CS, A1, A0, RESET, WR
-1.0
+1.0
A
IO
I/O Pin Leakage Current
VO = VCC or GND, D0 - D7
-10
+10
A
Bus Hold High Current
VO = 3.0V. Ports A, B, C
TA = -55°C
-50
-450
A
TA = +128°C
-50
-400
A
TA = -55°C
50
450
A
TA = +128°C
50
400
A
-2.5
Note 2, 4
mA
IBHH
IBHL
IDAR
Bus Hold Low Current
VO = 1.0V. Port A ONLY
Darlington Drive Current
Ports A, B, C. Test Condition 3
ICCSB
Standby Power Supply Current
VCC = 5.5V, VIN = VCC or GND. Output Open
-
10
A
ICCOP
Operating Power Supply Current
TA = +25°C, VCC = 5.0V, Typical (See Note 3)
-
1
mA/MHz
NOTES:
2. No internal current limiting exists on Port Outputs. A resistor must be added externally to limit the current.
3. ICCOP = 1mA/MHz of Peripheral Read/Write cycle time. (Example: 1.0s I/O Read/Write cycle time = 1mA).
4. Tested as VOH at -2.5mA.
Capacitance TA = +25°C
SYMBOL
PARAMETER
TYPICAL
UNITS
CIN
Input Capacitance
10
pF
CI/O
I/O Capacitance
20
pF
18
TEST CONDITIONS
FREQ = 1MHz, All Measurements are referenced to
device GND
FN2969.11
December 8, 2015
82C55A
AC Electrical Specifications
VCC = +5V 10%, GND = 0V; TA = Operating Temperature Range
82C55A-5
SYMBOL
PARAMETER
82C55A
MIN
MAX
MIN
MAX
UNITS
TEST
CONDITIONS
READ TIMING
(1) tAR
Address Stable Before RD
0
-
0
-
ns
(2) tRA
Address Stable After RD
0
-
0
-
ns
(3) tRR
RD Pulse Width
250
-
150
-
ns
(4) tRD
Data Valid From RD
-
200
-
120
ns
1
(5) tDF
Data Float After RD
10
75
10
75
ns
2
(6) tRV
Time Between RDs and/or WRs
300
-
300
-
ns
WRITE TIMING
(7) tAW
Address Stable Before WR
0
-
0
-
ns
(8) tWA
Address Stable After WR
20
-
20
-
ns
(9) tWW
WR Pulse Width
100
-
100
-
ns
(10) tDW
Data Valid to WR High
100
-
100
-
ns
(11) tWD
Data Valid After WR High
30
-
30
-
ns
OTHER TIMING
(12) tWB
WR = 1 to Output
-
350
-
350
ns
(13) tIR
Peripheral Data Before RD
0
-
0
-
ns
(14) tHR
Peripheral Data After RD
0
-
0
-
ns
(15) tAK
ACK Pulse Width
200
-
200
-
ns
(16) tST
STB Pulse Width
100
-
100
-
ns
(17) tPS
Peripheral Data Before STB High
20
-
20
-
ns
(18) tPH
Peripheral Data After STB High
50
-
50
-
ns
(19) tAD
ACK = 0 to Output
-
175
-
175
ns
1
(20) tKD
ACK = 1 to Output Float
20
250
20
250
ns
2
(21) tWOB
WR = 1 to OBF = 0
-
150
-
150
ns
1
(22) tAOB
ACK = 0 to OBF = 1
-
150
-
150
ns
1
(23) tSIB
STB = 0 to IBF = 1
-
150
-
150
ns
1
(24) tRIB
RD = 1 to IBF = 0
-
150
-
150
ns
1
(25) tRIT
RD = 0 to INTR = 0
-
200
-
200
ns
1
(26) tSIT
STB = 1 to INTR = 1
-
150
-
150
ns
1
(27) tAIT
ACK = 1 to INTR = 1
-
150
-
150
ns
1
(28) tWIT
WR = 0 to INTR = 0
-
200
-
200
ns
1
(29) tRES
Reset Pulse Width
500
-
500
-
ns
1, (Note)
1
NOTE: Period of initial Reset pulse after power-on must be at least 50sec. Subsequent Reset pulses may be 500ns minimum.
19
FN2969.11
December 8, 2015
82C55A
Timing Waveforms
tRR (3)
RD
tIR (13)
tHR (14)
INPUT
tAR (1)
tRA (2)
CS, A1, A0
D7-D0
tRD (4)
tDF (5)
FIGURE 25. MODE 0 (BASIC INPUT)
tWW (9)
WR
tDW
(10)
tWD (11)
D7-D0
tAW (7)
tWA (8)
CS, A1, A0
OUTPUT
tWS (12)
FIGURE 26. MODE 0 (BASIC OUTPUT)
tST (16)
STB
tSIB
(23)
IBF
tSIT
(26)
tRIB (24)
tRIT
(25)
INTR
RD
tPH
(18)
INPUT FROM
PERIPHERAL
tPS (17)
FIGURE 27. MODE 1 (STROBED INPUT)
20
FN2969.11
December 8, 2015
82C55A
Timing Waveforms
(Continued)
tWOB (21)
WR
tAOB (22)
OBF
tWIT
(28)
INTR
ACK
tAK (15)
tAIT (27)
OUTPUT
tWB (12)
FIGURE 28. MODE 1 (STROBED OUTPUT)
DATA FROM
CPU TO 82C55A
WR
(NOTE)
tAOB
(22)
OBF
tWOB
(21)
INTR
tAK
(15)
ACK
tST
(16)
STB
(NOTE)
tSIB
(23)
IBF
tAD (19)
tPS (17)
tKD
(20)
PERIPHERAL
BUS
tRIB (24)
tPH (18)
RD
DATA FROM
PERIPHERAL TO 82C55A
DATA FROM
82C55A TO PERIPHERAL
DATA FROM
82C55A TO CPU
FIGURE 29. MODE 2 (BIDIRECTIONAL)
NOTE: Any sequence where WR occurs before ACK and STB occurs before RD is permissible. (INTR = IBF  MASK  STB  RD  OBF  MASK
 ACK  WR)
21
FN2969.11
December 8, 2015
82C55A
Timing Waveforms
(Continued)
A0-A1,
CS
tWA (8)
tAW (7)
DATA
BUS
tDW (10)
tWD (11)
A0-A1,
CS
tRA (2)
tAR (1)
tRR (3)
RD
(4) tRD
WR
tDF (5)
DATA
BUS
VALID
tWW (9)
HIGH IMPEDANCE
FIGURE 30. WRITE TIMING
FIGURE 31. READ TIMING
AC Test Circuit
AC Testing Input, Output Waveforms
V1
INPUT
OUTPUT
VIH + 0.4V
VOH
1.5V
R1
OUTPUT FROM
DEVICE UNDER
TEST
TEST
POINT
R2
C1
(SEE NOTE)
1.5V
VIL - 0.4V
VOL
AC Testing: All AC Parameters tested as per test circuits. Input RISE
and FALL times are driven at 1ns/V.
TEST CONDITION DEFINITION TABLE
NOTE: Includes STRAY and JIG Capacitance
22
TEST CONDITION
V1
R1
R2
C1
1
1.7V
523
Open
150pF
2
VCC
2k
1.7k
50pF
3
1.5V
750
Open
50pF
FN2969.11
December 8, 2015
82C55A
Burn-In Circuits
CERDIP
37
F14
5
36
F2
F3
6
35
F5
GND
7
34
GND
6
5
4
3
2
F2
4
F4
F14
F9
F13
F13
F11
38
F12
3
F6
F12
F8
F7
F11
39
F8
40
2
F9
1
F7
F4
F6
F3
CLCC
1 44 43 42 41 40
7
39
F15
8
38
F5
F0
8
33
F11
F0
9
37
F15
F1
9
32
F12
10
36
F10
10
31
F13
F1
F10
11
35
F11
F12
F6
11
30
F14
F6
12
34
F13
F7
13
33
F14
F8
14
32
F15
F9
15
31
F11
F10
16
30
F12
F6
17
29
26
F6
16
25
F13
F7
17
24
F14
F8
18
23
F15
F9
19
22
F11
F10
20
21
F12
NOTES:
C1
18 19 20 21 22 23 24 25 26 27 28
C1
F13
15
VCC
VCC
F10
F12
F14
27
F15
14
F11
F9
F12
F11
F10
F15
28
F9
29
13
F8
12
F8
F7
F7
NOTES:
1. VCC = 5.5V  0.5V
1. C1 = 0.01F minimum
2. VIH = 4.5V  10%
2. All resistors are 47k  5%
3. VIL = -0.2V to 0.4V
3. f0 = 100kHz  10%
4. GND = 0V
4. f1 = f0  2; f2 = f1  2; . . . ; f15 = f14  2
23
FN2969.11
December 8, 2015
82C55A
GLASSIVATION:
Die Characteristics
Type: SiO2
Thickness: 8kÅ 1kÅ
METALLIZATION:
Type: Silicon - Aluminum
Thickness: 11kÅ 1kÅ
Metallization Mask Layout
82C55A
RD
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7 WR
RESET
CS
D0
GND
D1
A1
D2
A0
D3
PC7
D4
PC6
D5
PC5
D6
PC4
D7
PC0
VCC
PC1
PC2
24
PC3
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
FN2969.11
December 8, 2015
82C55A
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to the web to make
sure that you have the latest revision.
DATE
REVISION
December 8, 2015
FN2969.11
CHANGE
- Ordering Information Table on page 1.
- Added Revision History.
- Added About Intersil Verbiage.
About Intersil
Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products
address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets.
For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com.
You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask.
Reliability reports are also available from our website at www.intersil.com/support
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9001 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
25
FN2969.11
December 8, 2015
82C55A
Dual-In-Line Plastic Packages (PDIP)
E40.6 (JEDEC MS-011-AC ISSUE B)
N
40 LEAD DUAL-IN-LINE PLASTIC PACKAGE
E1
INDEX
AREA
1 2 3
INCHES
N/2
SYMBOL
-B-
-C-
SEATING
PLANE
A2
e
B1
D1
A1
eC
B
0.010 (0.25) M
C A B S
MAX
NOTES
-
0.250
-
6.35
4
0.015
-
0.39
-
4
A2
0.125
0.195
3.18
4.95
-
B
0.014
0.022
0.356
0.558
-
C
L
B1
0.030
0.070
0.77
1.77
8
eA
C
0.008
0.015
0.204
0.381
-
D
1.980
2.095
D1
0.005
-
A
L
D1
MIN
A
E
BASE
PLANE
MAX
A1
-AD
MILLIMETERS
MIN
C
eB
NOTES:
1. Controlling Dimensions: INCH. In case of conflict between English
and Metric dimensions, the inch dimensions control.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Symbols are defined in the “MO Series Symbol List” in Section 2.2
of Publication No. 95.
4. Dimensions A, A1 and L are measured with the package seated in
JEDEC seating plane gauge GS-3.
5. D, D1, and E1 dimensions do not include mold flash or protrusions.
Mold flash or protrusions shall not exceed 0.010 inch (0.25mm).
6. E and eA are measured with the leads constrained to be perpendicular to datum -C- .
50.3
53.2
5
-
5
0.13
E
0.600
0.625
15.24
15.87
6
E1
0.485
0.580
12.32
14.73
5
e
0.100 BSC
2.54 BSC
-
eA
0.600 BSC
15.24 BSC
6
eB
-
0.700
-
17.78
7
L
0.115
0.200
2.93
5.08
4
N
40
40
9
Rev. 0 12/93
7. eB and eC are measured at the lead tips with the leads unconstrained. eC must be zero or greater.
8. B1 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25mm).
9. N is the maximum number of terminal positions.
10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3, E28.3,
E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 - 1.14mm).
26
FN2969.11
December 8, 2015
82C55A
Ceramic Dual-In-Line Frit Seal Packages (CERDIP)
F40.6 MIL-STD-1835 GDIP1-T40 (D-5, CONFIGURATION A)
40 LEAD CERAMIC DUAL-IN-LINE FRIT SEAL PACKAGE
LEAD FINISH
c1
-D-
-A-
BASE
METAL
(c)
E
M
-Bbbb S
C A-B S
Q
-C-
SEATING
PLANE
S1
b2
b
ccc M
C A-B S
eA/2
-
0.225
-
5.72
-
0.026
0.36
0.66
2
b1
0.014
0.023
0.36
0.58
3
b2
0.045
0.065
1.14
1.65
-
b3
0.023
0.045
0.58
1.14
4
c
0.008
0.018
0.20
0.46
2
c1
0.008
0.015
0.20
0.38
3
D
-
2.096
-
53.24
5
E
0.510
0.620
15.75
5
c
aaa M C A - B S D S
D S
NOTES
0.014
eA
e
MAX
b

A A
MIN
A
A
L
MILLIMETERS
MAX
M
(b)
D
BASE
PLANE
MIN
b1
SECTION A-A
D S
INCHES
SYMBOL
NOTES:
1. Index area: A notch or a pin one identification mark shall be located adjacent to pin one and shall be located within the shaded
area shown. The manufacturer’s identification shall not be used
as a pin one identification mark.
e
12.95
0.100 BSC
2.54 BSC
-
eA
0.600 BSC
15.24 BSC
-
eA/2
0.300 BSC
7.62 BSC
-
L
0.125
0.200
3.18
5.08
-
Q
0.015
0.070
0.38
1.78
6
S1
0.005
-
0.13
-
7
105o
90o
105o
-
2. The maximum limits of lead dimensions b and c or M shall be
measured at the centroid of the finished lead surfaces, when
solder dip or tin plate lead finish is applied.

90o
aaa
-
0.015
-
0.38
-
3. Dimensions b1 and c1 apply to lead base metal only. Dimension
M applies to lead plating and finish thickness.
bbb
-
0.030
-
0.76
-
ccc
-
0.010
-
0.25
-
M
-
0.0015
-
0.038
2, 3
4. Corner leads (1, N, N/2, and N/2+1) may be configured with a
partial lead paddle. For this configuration dimension b3 replaces
dimension b2.
5. This dimension allows for off-center lid, meniscus, and glass
overrun.
N
40
40
8
Rev. 0 4/94
6. Dimension Q shall be measured from the seating plane to the
base plane.
7. Measure dimension S1 at all four corners.
8. N is the maximum number of terminal positions.
9. Dimensioning and tolerancing per ANSI Y14.5M - 1982.
10. Controlling dimension: INCH.
27
FN2969.11
December 8, 2015
82C55A
Ceramic Leadless Chip Carrier Packages (CLCC)
J44.A
MIL-STD-1835 CQCC1-N44 (C-5)
44 PAD CERAMIC LEADLESS CHIP CARRIER PACKAGE
0.010 S E H S
D
INCHES
D3
SYMBOL
j x 45o
E3
B
E
h x 45o
0.010 S E F S
A
A1
PLANE 2
PLANE 1
-E-
B1
e
L
-H-
L3
MILLIMETERS
MAX
MAX
NOTES
A
0.064
0.120
1.63
3.05
6, 7
0.054
0.088
1.37
2.24
-
B
0.033
0.039
0.84
0.99
4
B1
0.022
0.028
0.56
0.71
2, 4
B2
0.072 REF
1.83 REF
-
B3
0.006
0.022
0.15
0.56
-
D
0.640
0.662
16.26
16.81
-
D1
0.500 BSC
12.70 BSC
-
D2
0.250 BSC
6.35 BSC
-
D3
-
0.662
E
0.640
0.662
16.26
16.81
2
16.81
-
E1
0.500 BSC
12.70 BSC
-
E2
0.250 BSC
6.35 BSC
-
E3
e
-
0.662
0.050 BSC
0.015
-
-
16.81
1.27 BSC
0.38
2
-
-
2
h
0.040 REF
1.02 REF
5
j
0.020 REF
0.51 REF
5
L
0.045
0.055
1.14
1.40
-
L1
0.045
0.055
1.14
1.40
-
L2
0.075
0.095
1.90
2.41
-
L3
0.003
0.015
0.08
0.38
-
ND
11
11
3
NE
11
11
3
N
44
44
-F-
3
Rev. 0 5/18/94
B3
E1
E2
MIN
A1
e1
0.007 M E F S H S
MIN
1. Metallized castellations shall be connected to plane 1 terminals
and extend toward plane 2 across at least two layers of ceramic
or completely across all of the ceramic layers to make electrical
connection with the optional plane 2 terminals.
L2
B2
L1
D2
e1
D1
NOTES:
2. Unless otherwise specified, a minimum clearance of 0.015 inch
(0.38mm) shall be maintained between all metallized features
(e.g., lid, castellations, terminals, thermal pads, etc.)
3. Symbol “N” is the maximum number of terminals. Symbols “ND”
and “NE” are the number of terminals along the sides of length
“D” and “E”, respectively.
4. The required plane 1 terminals and optional plane 2 terminals (if
used) shall be electrically connected.
5. The corner shape (square, notch, radius, etc.) may vary at the
manufacturer’s option, from that shown on the drawing.
6. Chip carriers shall be constructed of a minimum of two ceramic
layers.
7. Dimension “A” controls the overall package thickness. The maximum “A” dimension is package height before being solder dipped.
8. Dimensioning and tolerancing per ANSI Y14.5M-1982.
9. Controlling dimension: INCH.
28
FN2969.11
December 8, 2015
82C55A
Plastic Leaded Chip Carrier Packages (PLCC)
0.042 (1.07)
0.048 (1.22)
PIN (1) IDENTIFIER
0.042 (1.07)
0.056 (1.42)
0.004 (0.10)
C
0.025 (0.64)
R
0.045 (1.14)
0.050 (1.27) TP
C
L
N44.65 (JEDEC MS-018AC ISSUE A)
44 LEAD PLASTIC LEADED CHIP CARRIER PACKAGE
INCHES
SYMBOL
D2/E2
E1 E
C
L
D2/E2
VIEW “A”
0.020 (0.51)
MIN
A1
A
D1
D
SEATING
-C- PLANE
0.020 (0.51) MAX
3 PLCS
0.026 (0.66)
0.032 (0.81)
MAX
MILLIMETERS
MIN
MAX
NOTES
A
0.165
0.180
4.20
4.57
-
A1
0.090
0.120
2.29
3.04
-
D
0.685
0.695
17.40
17.65
-
D1
0.650
0.656
16.51
16.66
3
D2
0.291
0.319
7.40
8.10
4, 5
E
0.685
0.695
17.40
17.65
-
E1
0.650
0.656
16.51
16.66
3
E2
0.291
0.319
7.40
8.10
4, 5
N
44
44
6
Rev. 2 11/97
0.013 (0.33)
0.021 (0.53)
0.025 (0.64)
MIN
0.045 (1.14)
MIN
MIN
VIEW “A” TYP.
NOTES:
1. Controlling dimension: INCH. Converted millimeter dimensions are
not necessarily exact.
2. Dimensions and tolerancing per ANSI Y14.5M-1982.
3. Dimensions D1 and E1 do not include mold protrusions. Allowable
mold protrusion is 0.010 inch (0.25mm) per side. Dimensions D1
and E1 include mold mismatch and are measured at the extreme
material condition at the body parting line.
4. To be measured at seating plane -C- contact point.
5. Centerline to be determined where center leads exit plastic body.
6. “N” is the number of terminal positions.
29
FN2969.11
December 8, 2015
82C55A
Metric Plastic Quad Flatpack Packages (MQFP)
D
Q44.10x10 (JEDEC MS-022AB ISSUE B)
44 LEAD METRIC PLASTIC QUAD FLATPACK PACKAGE
D1
-D-
INCHES
SYMBOL
-A-
-B-
E E1
e
PIN 1
SEATING
A PLANE
-H-
0.076
0.003
-C-
12o-16o
0.40
0.016 MIN
0.20
M
0.008
C A-B S
0o MIN
D S
b
A2 A1
0o-7o
L
b1
30
MILLIMETERS
MIN
MAX
NOTES
A
-
0.096
-
2.45
-
A1
0.004
0.010
0.10
0.25
-
A2
0.077
0.083
1.95
2.10
-
b
0.012
0.018
0.30
0.45
6
b1
0.012
0.016
0.30
0.40
-
D
0.515
0.524
13.08
13.32
3
D1
0.389
0.399
9.88
10.12
4, 5
E
0.516
0.523
13.10
13.30
3
E1
0.390
0.398
9.90
10.10
4, 5
L
0.029
0.040
0.73
1.03
-
N
44
44
7
e
0.032 BSC
0.80 BSC
Rev. 2 4/99
NOTES:
1. Controlling dimension: MILLIMETER. Converted inch
dimensions are not necessarily exact.
2. All dimensions and tolerances per ANSI Y14.5M-1982.
3. Dimensions D and E to be determined at seating plane -C- .
4. Dimensions D1 and E1 to be determined at datum plane
-H- .
6. Dimension b does not include dambar protrusion. Allowable
dambar protrusion shall be 0.08mm (0.003 inch) total.
BASE METAL
WITH PLATING
MAX
5. Dimensions D1 and E1 do not include mold protrusion.
Allowable protrusion is 0.25mm (0.010 inch) per side.
0.13/0.17
0.005/0.007
12o-16o
MIN
7. “N” is the number of terminal positions.
0.13/0.23
0.005/0.009
FN2969.11
December 8, 2015
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