TM
82C85
March 1997
CMOS Static Clock Controller/Generator
Features
Description
• Generates the System Clock For CMOS or NMOS
Microprocessors and Peripherals
• Complete Control Over System Operation for Very
Low System Power
The Intersil 82C85 Static CMOS Clock Controller/Genera-
tor provides complete control of static CMOS system oper-
ating modes and supports full speed, slow, stop-clock and
stop-oscillator operation. While directly compatible with the
Intersil 80C86 and 80C88 16-bit Static CMOS Microproces-
sor Family, the 82C85 can also be used for general system
clock control.
- Stop-Oscillator
- Low Frequency
- Stop-Clock
- Full Speed Operation
For static system designs, separate signals are provided
on the 82C85 for stop (S0, S1, S2/STOP) and start
(START) control of the crystal oscillator and system clocks.
A single control line (SLO/FST) determines 82C85 fast
(crystal/EFI frequency divided by 3) or slow (crystal/EFI
frequency divided by 768) mode operation. Automatic
maximum mode 80C86 and 80C88 software HALT
instruction decode logic in the 82C85 enables software-
based clock control. Restart logic insures valid clock start-
up and complete synchronization of system clocks.
The 82C85 is manufactured using the Intersil advanced
• DC to 25MHz Operation (DC to 8MHz System Clock)
• Generates 50% and 33% Duty Cycle Clocks
(Synchronized)
• Uses a Parallel Mode Crystal Circuit or External
Frequency Source
• TTL Compatible Inputs/Outputs
• 24 Lead Slimline Dual-In-Line or 28 Pad Square LCC
Package Options
• Single 5V Power Supply
• Operating Temperature Range
- C82C85 . . . . . . . . . . . . . . . . . . . . . . . . . .0 C to +70 C Scaled SAJI IV CMOS process. In addition to clock control
- I82C85 . . . . . . . . . . . . . . . . . . . . . . . . . -40 C to +85 C circuitry, the 82C85 also contains a crystal controlled
o
o
o
o
o
o
- M82C85 . . . . . . . . . . . . . . . . . . . . . . . -55 C to +125 C oscillator (up to 25MHz), clock generation logic, complete
“Ready” synchronization and reset logic. This permits the
designer to tailor the system power-performance product to
Ordering Information
PART NUMBER
CS82C85
PACKAGE
TEMP. RANGE PKG. NO.
provide optimum performance at low power levels.
o
o
28 Ld PLCC
0 C to +70 C
N28.45
o
o
IS82C85
-40 C to +85 C N28.45
o
o
CD82C85
24 Ld CERDIP
0 C to +70 C
F24.3
o
o
ID82C85
-40 C to +85 C F24.3
o
o
MD82C85/B
MR82C85/B
-55 C to +125 C F24.3
o
o
28 Pad CLCC -55 C to +125 C J28.A
Pinouts
28 LEAD PLCC, CLCC
24 LEAD CERDIP
TOP VIEW
TOP VIEW
1
2
24
23
22
21
20
19
18
17
16
15
14
13
CSYNC
V
CC
PCLK
AEN1
X1
4
3
2
28 27 26
1
3
X2
25
24
23
22
21
20
19
NC
ASYNC
EFI
RDY1
READY
RDY2
AEN2
CLK
5
6
7
8
9
4
ASYNC
EFI
RDY1
5
READY
RDY2
F/C
6
F/C
OSC
RES
RESET
7
AEN2
OSC
RES
RESET
S2/STOP
S1
GND 10
NC 11
8
CLK
9
GND
12 13 14 15
17
18
16
10
11
12
CLK50
START
SLO/FST
S0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a trademark of Intersil Americas Inc.
FN2976.1
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
297