ICD2051 Cypress Semiconductor Corp., ICD2051 Datasheet - Page 6

• Manufacturer Part Number: ICD2051
• Description: Dual Programmable Clock Generator
• Manufacturer: Cypress Semiconductor Corp.

ICD2051:1/95
Revision: April 11, 1995
Switching Characteristics
Switching Waveforms
Duty Cycle Timing
f
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Note:
(REF)
(REF)
2
3
4
5
6
6H
6L
7
8
9
10
11
12
13
14
15
2.
Parameter
Input capacitance is typically 10 pF, except for the crystal pads.
1.5V
Output Frequency
Reference Frequency
Reference Clock Period
Duty Cycle
Output Rise Time
Output Fall Time
CLKA/2/4 skew
MUXREF Set-Up Time
SCLK Cycle Time
SCLK HIGH Time
SCLK LOW Time
Output Clock Stable
Time
Data Set-Up Time
Data Hold Time
Transition Time
Transition Time
Transition Time
Transition Time
Output Disable Time
Output Enable Time
Name
t
1A
1.5V
Over the Operating Range
t
1B
Reference Oscillator nominal value
t
Duty cycle for the output oscillators defined as
t
Rise time for the outputs into a 25-pF load
Fall time for the outputs into a 25-pF load
Skew delay between the CLKA output and the
CLKA/2 and CLKA/4 outputs
Delay required after MUXREF goes LOW prior
to starting the SCLK clock line
Minimum cycle time for the SCLK clock
Minimum HIGH time for the SCLK clock
Minimum LOW time for the SCLK clock
Time required for CLKA or CLKB output to be-
come valid after last SCLK clock
Time required for the data to be valid prior to the
rising edge of SCLK
Time required for the data to remain valid after
the rising edge of SCLK
Time for CLKA or CLKB to go HIGH after asser-
tion of MUXREF
Delay of CLKA or CLKB prior to valid t
at output
Time for CLKA or CLKB to go HIGH after re-
lease of MUXREF
Delay of CLKA or CLKB prior to valid new fre-
quency at output
Time for the outputs to go into three-state mode
after OE signal assertion
Time for the outputs to recover from three-state
mode after OE signal goes HIGH
(REF)
1A
1.5V
t
1B
= 1/f
(REF)
[2]
Description
ICD2051–3
6
(REF)
signal
2
t
t
0.320
(REF)
t
t
freq2
Min.
40%
t
*
(REF)
(REF)
freq1
t
40
10
(REF)
1
5
0
0
/2
/2
3(t
3(t
Max.
1000
t
60%
t
(REF)
100
(REF)
freq2
freq1
25
10
12
12
3
3
2
ICD2051
/2)
/2)
msec
MHz
MHz
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns