MD82C54/B Intersil, MD82C54/B Datasheet - Page 5

• Manufacturer Part Number: MD82C54/B
• Manufacturer: Intersil
• Type: Programmabler

Specifications of MD82C54/B

• # Internal Timers: 1
• Propagation Delay Time: 260ns
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Package Type: CDIP
• High Level Output Current: -2.5mA
• Low Level Output Current: 2.5mA
• Pin Count: 24
• Operating Temp Range: -55C to 125C
• Operating Temperature Classification: Military
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Not Compliant

Functional Diagram
Pin Description
SYMBOL
GATE 0
GATE 1
GATE 2
D7 - D0
OUT 0
OUT 1
OUT 2
A0, A1
D
CLK 0
CLK 1
CLK 2
GND
V
WR
7
RD
CS
CC
- D
WR
RD
CS
A
A
0
0
1
8
NUMBER
DIP PIN
REGISTER
CONTROL
19 - 20
1 - 8
BUFFER
WORD
WRITE
LOGIC
10
11
12
13
14
15
16
17
18
21
22
23
24
DATA/
READ/
9
BUS
TYPE
5
I/O
O
O
O
I
I
I
I
I
I
I
I
I
I
-
DATA: Bi-directional three-state data bus lines, connected to system data bus.
CLOCK 0: Clock input of Counter 0.
OUT 0: Output of Counter 0.
GATE 0: Gate input of Counter 0.
GROUND: Power supply connection.
OUT 1: Output of Counter 1.
GATE 1: Gate input of Counter 1.
CLOCK 1: Clock input of Counter 1.
GATE 2: Gate input of Counter 2.
OUT 2: Output of Counter 2.
CLOCK 2: Clock input of Counter 2.
ADDRESS: Select inputs for one of the three counters or Control Word Register for read/write
operations. Normally connected to the system address bus.
CHIP SELECT: A low on this input enables the 82C54 to respond to RD and WR signals. RD and WR
are ignored otherwise.
READ: This input is low during CPU read operations.
WRITE: This input is low during CPU write operations.
V
decoupling.
CC
: The +5V power supply pin. A 0.1µF capacitor between pins VCC and GND is recommended for
COUNTER
COUNTER
COUNTER
0
1
2
CLK 0
GATE 0
OUT 0
CLK 1
GATE 1
OUT 1
CLK 2
GATE 2
OUT 2
82C54
CLK n
A1
0
0
1
1
REGISTER
CONTROL
CONTROL
GATE n
WORD
LOGIC
OUT n
A0
0
1
0
1
REGISTER
DEFINITION
STATUS
STATUS
LATCH
COUNTER INTERNAL BLOCK DIAGRAM
Counter 0
Counter 1
Counter 2
Control Word Register
INTERNAL BUS
SELECTS
CR
OL
M
M
CE
CR
OL
L
L