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ID82C85 Datasheet

  • ID82C85

  • CMOS Static Clock Controller/Generator

  • 21頁(yè)

  • INTERSIL   INTERSIL

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TM
82C85
CMOS Static Clock Controller/Generator
Description
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.
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
Scaled SAJI IV CMOS process. In addition to clock control
circuitry, the 82C85 also contains a crystal controlled
oscillator (up to 25MHz), clock generation logic, complete
鈥淩eady鈥?synchronization and reset logic. This permits the
designer to tailor the system power-performance product to
provide optimum performance at low power levels.
March 1997
Features
鈥?Generates the System Clock For CMOS or NMOS
Microprocessors and Peripherals
鈥?Complete Control Over System Operation for Very
Low System Power
- Stop-Oscillator
- Low Frequency
- Stop-Clock
- Full Speed Operation
鈥?DC to 25MHz Operation (DC to 8MHz System Clock)
鈥?Generates 50% and 33% Duty Cycle Clocks
(Synchronized)
鈥?Uses a Parallel Mode Crystal Circuit or External
Frequency Source
鈥?TTL Compatible Inputs/Outputs
鈥?24 Lead Slimline Dual-In-Line or 28 Pad Square LCC
Package Options
鈥?Single 5V Power Supply
鈥?Operating Temperature Range
- C82C85 . . . . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to +70
o
C
- I82C85 . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to +85
o
C
- M82C85 . . . . . . . . . . . . . . . . . . . . . . . -55
o
C to +125
o
C
Ordering Information
PART NUMBER
CS82C85
IS82C85
CD82C85
ID82C85
MD82C85/B
MR82C85/B
28 Pad CLCC
24 Ld CERDIP
PACKAGE
28 Ld PLCC
TEMP. RANGE
0
o
C to +70
o
C
-40
o
C to +85
o
C
0
o
C to +70
o
C
-40
o
C to +85
o
C
-55
o
C to +125
o
C
-55
o
C to +125
o
C
PKG. NO.
N28.45
N28.45
F24.3
F24.3
F24.3
J28.A
Pinouts
24 LEAD CERDIP
TOP VIEW
CSYNC
1
PCLK
2
AEN1
3
RDY1
4
READY
5
RDY2
6
AEN2
7
CLK
8
GND
9
CLK50
10
START
11
SLO/FST
12
24
V
CC
23
X1
22
X2
21
ASYNC
20
EFI
19
F/C
18
OSC
17
RES
16
RESET
15
S2/STOP
14
S1
13
S0
28 LEAD PLCC, CLCC
TOP VIEW
AEN1
PCLK
CSYNC
NC
V
CC
X1
S0
S1
X2
25
NC
24
ASYNC
23
EFI
22
F/C
21
OSC
20
RES
19
RESET
12 13 14 15 16 17 18
4
3
2
1 28 27 26
RDY1
READY
RDY2
AEN2
CLK
GND
NC
5
6
7
8
9
10
11
CLK50
START
SLO/FST
NC
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.
Copyright 漏 Intersil Americas Inc. 2002. All Rights Reserved
S2/STOP
FN2976.1
297

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