• Pin Compatible with NMOS 8285 and Intersil 82C85
• Generates System Clocks for Microprocessors and Peripherals
• Complete Control Over System Clock Operation for Very Low
System Power
- Stop-Oscillator
- Stop-Clock
- Low Frequency (Slo) Mode
- Full Speed Operation
• DC to 15MHz Operation (DC to 5MHz System Clock)
• Generates Both 50% and 33% Duty Cycle Clocks (Synchronized)
• Uses Either Parallel Mode Crystal Circuit or External Frequency
Source
• Hardened Field, Self-Aligned, Junction Isolated CMOS Process
• Single 5V Supply
• Military Temperature Range -55
5
RAD (Si)
8
RAD (Si)/s
o
C to +125oC
Description
The Intersil HS-82C85RH is a high performance, radiation hardened
CMOS Clock Controller/Generator designed to support systems utilizing
radiation hardened static CMOS microprocessors such as the
HS-80C86RH. The HS-82C85RH contains a crystal controlled oscillator,
reset pulse conditioning, halt/restart logic, and divide-by-256 circuitry.
These features provide the means to stop the system clock, stop the clock
oscillator, or run the system at a low frequency (CLK/256), enhancing
control of static system power dissipation and allowing system shut-down
during periods of external stress.
Static CMOS circuit design insures low operating power and permits
operation with an external frequency source from DC to 15MHz. Crystal
controlled operation to 15MHz is guaranteed with the use of a parallel,
fundamental mode crystal and two small load capacitors. Outputs are
guaranteed compatible with both CMOS and TTL specifications. The Intersil hardened field CMOS process results in performance equal to or
greater than existing radiation resistant products at a fraction of the power.
HS1-82C85RH-Q-55oC to +125oC24 Lead SBDIP
HS1-82C85RH-8-55oC to +125oC24 Lead SBDIP
HS1-82C85RH/Sample+25oC24 Lead SBDIP
HS9-82C85RH/Proto-55oC to +125oC24 Lead Ceramic Flatpack
HS9-82C85RH-Q-55oC to +125oC24 Lead Ceramic Flatpack
HS9-82C85RH-8-55oC to +125oC24 Lead Ceramic Flatpack
HS9-82C85RH/Sample+25oC24 Lead Ceramic Flatpack
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
EFI20IEXTERNAL FREQUENCY IN: When F/C is HIGH, CLK is generated from the EFI input signal.
F/C19IFREQUENCY/CRYSTAL SELECT: F/C selects either the crystal oscillator or the EFI input as the
START11IA low-to-high transition on START will restart the CLK, CLK50 and PCLK outputs after the
S0
S1
S2/STOP
SLO/FST12ISLO/FST is a level-triggered input. When HIGH, the CLK and CLK50 outputs run at the maximum
CLK8OPROCESSOR CLOCK: CLK is the clock output used by the HS-80C86RH processor and other
CLK5010O50% DUTY CYCLE CLOCK: CLK50 is an auxiliary clock with a 50% duty cycle and is synchro-
PCLK2OPERIPHERAL CLOCK: PCLK is a peripheral clock signal whose output frequency is equal to the
OSC18OOSCILLATOR OUTPUT: OSC is the output of the internal oscillator circuitry. Its frequency is
NUMBERTYPEDESCRIPTION
23
22
13
14
15
I
CRYSTAL CONNECTIONS: X1 and X2 are the crystal oscillator connections. The crystal
O
frequency must be three times the maximum desired processor clock frequency. X1 is the
oscillator circuit input and X2 is the output of the oscillator circuit.
This input signal should be a square wave with a frequency of three times the maximum desired
CLK output frequency.
main frequency source. When F/C is LOW, the HS-82C85RH clocks are derived from the crystal
oscillator circuit. When F/C is HIGH, CLK is generated from the EFI input. F/C cannot be dynamically switched during normal operation.
appropriate restart sequence is completed.
When in the crystal mode (F/C LOW) with the oscillator stopped, the oscillator will be restarted
when a Start command is received. The CLK, CLK50 and PCLK outputs will start after the oscillator input signal (X1) reaches the Schmitt trigger input threshold and an 8K internal counter
reaches terminal count. If F/C is HIGH (EFI mode), CLK, CLK50 and PCLK will restart within 3 EFI
cycles after START is recognized.
The HS-82C85RH will restart in the same mode (SLO/FST) in which it stopped. A high level on
START disables the STOP mode.
I
S2/STOP, S1, S0 are used to stop the HS-82C85RH clock outputs (CLK, CLK50, PCLK) and are
I
sampled by the rising edge of CLK. CLK, CLK50 and PCLK are stopped byS2/STOP,S1, S0 being
I
in the LHH state on the low-to-high transition of CLK. This LHH state must follow a passive HHH
state occurring on the previous low-to-high CLK transition. CLK and CLK50 stop in the high state.
PCLK stops in it’s current state (high or low).
When in the crystal mode (F/C) low and a STOP command is issued, the HS-82C85RH oscillator
will stop along with the CLK, CLK50 and PCLK outputs. When in the EFI mode, only the CLK,
CLK50 and PCLK outputs will be halted. The oscillator circuit if operational, will continue to run.
The oscillator and/or clock is restarted by the START input signal going true (HIGH) or the reset
input (RES) going low.
frequency (crystal or EFI frequency divided by 3). When LOW, CLK and CLK50 frequencies are
equal to the crystal or EFI frequency divided by 768. SLO/FST mode changes are internally
synchronized to eliminate glitches on the CLK and CLK50. START and STOP control of the
oscillator or EFI is available in either the SLOW or FAST frequency modes.
The SLO/FST input must be held LOW for at least 195 OSC/EFI clock cycles before it will be
recognized. This eliminates unwanted frequency changes which could be caused by glitches or
noise transients. The SLO/FST input must be held HIGH for at least 6 OSC/EFI clock pulses to
guarantee a transition to FAST mode operation.
peripheral devices. When SLO/FST is high, CLK has an output frequency which is equal to the
crystal or EFI input frequency divided by three. When SLO/FST is low, CLK has an output frequency which is equal to the crystal or EFI input frequency divide by 768. CLK has a 33% duty cycle.
nized to the falling edge of CLK. When SLO/FST is high, CLK50 has an output frequency which
is equal to the crystal or EFI input frequency divided by 3. When SLO/FST is low, CLK50 has an
output frequency equal to the crystal or EFI input frequency divided by 768.
crystal or EFI input frequency divided by six and has a 50% duty cycle. PCLK frequency is
unaffected by the state of the SLO/FST input.
equal to that of the crystal oscillator circuit. OSC is unaffected by the state of the SLO/FST input.
When the HS-82C85RH is in the crystal mode (F/C LOW) and a STOP command is issued, the
OSC output will stop in the HIGH state. When the HS-82C85RH is in the EFI mode (F/C HIGH),
the oscillator (if operational) will continue to run when a STOP command is issued and OSC
remains active.
993
Spec Number 518061
HS-82C85RH
Pin Description
(Continued)
PIN
PIN
NUMBERTYPEDESCRIPTION
RES17IRESET IN: RES is an active LOW signal which is used to generate RESET. The HS-82C85RH
provides a Schmitt trigger input so that an RC connection can be used to establish the power-up
reset of proper duration. RES starts crystal oscillator operation.
RESET16ORESET: RESET is an active HIGH signal which is used to reset the HS-80C86RH processor. Its
timing characteristics are determined by RES. RESET is guaranteed to be HIGH for a minimum
of 16 CLK pulses after the rising edge of RES.
CSYNC1ICLOCK SYNCHRONIZATION: CSYNC is an active HIGH signal which allows multiple HS-
82C85RHs to be synchronized to provide multiple in-phase clock signals. When CSYNC is HIGH,
the internal counters are reset and force CLK, CLK50 and PCLK into a HIGH state. When CSYNC
is LOW, the internal counters are allowed to count and the CLK,CLK50 and PCLK outputs are
active. CSYNC must be externally synchronized to EFI.
AEN1
AEN2
3
7
I
ADDRESS ENABLE: AEN is an active LOW signal. AEN serves to qualify its respective Bus
I
Ready Signal (RDY1 or RDY2). AEN1 validates RDY1 while AEN2 validates RDY2. Two AEN
signal inputs are useful in system configurations which permit the processor to access two MultiMaster System Buses.
RDY1
RDY2
4
6
I
BUS READY: (Transfer Complete). RDY is an active HIGH signal which is an indication from a
I
device located on the system data bus that data has been received, or is available. RDY1 is
qualified by AEN1 while RDY2 is qualified by AEN2.
ASYNC21IREADY SYNCHRONIZATION SELECT: ASYNC is an input which defines the synchronization
mode of the READY logic. When ASYNC is LOW, two stages of READY synchronization are provided. When ASYNC is left open or HIGH a single stage of READY synchronization is provided.
READY5OREADY: READY is an active HIGH signal which is used to inform the HS-80C86RH that it may
conclude a pending data transfer.
GND9IGround
VDD24I+5V power supply
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.
to CLK
RDY1, RDY2 Hold to CLKTCLR1X9, 10, 11-55oC, +25oC, +125oC0 -ns
ASYNC Setup to CLKTAYVCL9, 10, 11-55oC, +25oC, +125oC84 -ns
ASYNC Hold to CLKTCLAYX9, 10, 11-55oC, +25oC, +125oC0 -ns
AEN1, AEN2 Setup to
RDY1, RDY2
AEN1, AEN2 Hold to CLKTCLA1X9, 10, 11-55oC, +25oC, +125oC0 -ns
CSYNC Setup to EFITYHEH9, 10, 11-55oC, +25oC, +125oC17 -ns
CSYNC Hold to EFITEHYL9, 10, 11-55oC, +25oC, +125oC17 -ns
CSYNC Pulse WidthTYHYL9, 10, 11-55oC, +25oC, +125oC2TELEL-ns
RES Setup to CLKTI1HCLNote 39, 10, 11-55oC, +25oC, +125oC105-ns
S0, S1, S2/STOP Setup to
CLK
S0, S1, S2/STOP Hold to
CLK
RES, START Setup to CLKTRSVCHNote 39, 10, 11-55oC, +25oC, +125oC105-ns
RES (Low) or START (High)
Time
CLK/CLK50 Fall TimeTCL1CL2VDD = 4.5V and 5.5V, 3.5V to
Output Rise Time
(Except CLK)
Output Fall Time
(Except CLK)
(+)VT - (-)VTVDD = 4.5V and 5.5V-55oC < TA < +125oC0.25-V
TSTARTVDD = 4.5V and 5.5V-55oC < TA < +125oC2TELEL
+3
TSTOPVDD = 4.5V and 5.5V-55oC < TA < +125oCTCLCL +
TCLCH
TCH1CH2VDD = 4.5V and 5.5V, 1.0V to
3.5V
1.0V
TOLOHVDD = 4.5V and 5.5V, 0.8V to
2.0V
TOHOLVDD = 4.5V and 5.5V, 2.0V to
0.8V
-55oC < TA < +125oC-15ns
-55oC < TA < +125oC-15ns
-55oC < TA < +125oC-25ns
-55oC < TA < +125oC-25ns
-ns
3TCHCH
+55
UNITSMINMAX
ns
997
Spec Number 518061
Specifications HS-82C85RH
TABLE 3. ELECTRICAL PERFORMANCE CHARACTERISTICS
PARAMETERSYMBOLCONDITIONTEMPERATURE
LIMITS
UNITSMINMAX
Start/Reset Valid to
CLK Low
RESET Output Time
High
NOTES:
1. The parameters listed in table 3 are controlled via design or process parameters and are not directly tested. These parameters are
characterized upon initial design release and upon design changes which would affect these characteristics.
2. All measurements referenced to device ground.
3. Oscillator start-up time depends on several factors including crystal frequency, crystal manufacturer, capacitive load, temperature, power
supply voltage, etc. This parameter is given for information only.
See +25oC limits in Table 1 and Table 2 for Post RAD limits (Subgroups 1, 7, 9)
TOSTVDD = 4.5V and 5.5V (TYP)
Note 3
TRSTVDD = 4.5V and 5.5V-55oC < TA < +125oC16
TABLE 4. POST 100K RAD ELECTRICAL PERFORMANCE CHARACTERISTICS