CY7B991
CY7B992
4
Electrical Characteristics
Over the Operating Range
[6]
CY7B991 CY7B992
Parameter Description Test Conditions Min. Max. Min. Max. Unit
V
OH
Output HIGH Voltage V
CC
= Min., I
OH
= –16 mA 2.4 V
V
CC
= Min., I
OH
=–40 mA V
CC
–0.75
V
OL
Output LOW Voltage V
CC
= Min., I
OL
= 46 mA 0.45 V
V
CC
= Min., I
OL
= 46 mA 0.45
V
IH
Input HIGH Voltage
(REF and FB inputs only)
2.0 V
CC
V
CC
–
1.35
V
CC
V
V
IL
Input LOW Voltage
(REF and FB inputs only)
–0.5 0.8 –0.5 1.35 V
V
IHH
Three-Level Input HIGH
Voltage (Test, FS, xFn)
[7]
Min. ≤ V
CC
≤ Max. V
CC
– 0.85 V
CC
V
CC
– 0.85 V
CC
V
V
IMM
Three-Level Input MID
Voltage (Test, FS, xFn)
[7]
Min. ≤ V
CC
≤ Max. V
CC
/2 –
500 mV
V
CC
/2 +
500 mV
V
CC
/2 –
500 mV
V
CC
/2 +
500 mV
V
V
ILL
Three-Level Input LOW
Voltage (Test, FS, xFn)
[7]
Min. ≤ V
CC
≤ Max. 0.0 0.85 0.0 0.85 V
I
IH
Input HIGH Leakage Current
(REF and FB inputs only)
V
CC
= Max., V
IN
= Max. 10 10
µA
I
IL
Input LOW Leakage Current
(REF and FB inputs only)
V
CC
= Max., V
IN
= 0.4V –500 –500
µA
I
IHH
Input HIGH Current
(Test, FS, xFn)
V
IN
= V
CC
200 200
µA
I
IMM
Input MID Current
(Test, FS, xFn)
V
IN
= V
CC
/2 –50 50 –50 50
µA
I
ILL
Input LOW Current
(Test, FS, xFn)
V
IN
= GND –200 –200
µA
I
OS
Output Short Circuit
Current
[8]
V
CC
= Max., V
OUT
= GND (25
°
C only)
–250 N/A mA
I
CCQ
Operating Current Used by
Internal Circuitry
V
CCN
= V
CCQ
=
Max., All Input
Selects Open
Com’l 85 85 mA
Mil/Ind 90 90
I
CCN
Output Buffer Current per
Output Pair
[9]
V
CCN
= V
CCQ
= Max.,
I
OUT
= 0 mA
Input Selects Open, f
MAX
14 19 mA
PD Power Dissipation per
Output Pair
[10]
V
CCN
= V
CCQ
= Max.,
I
OUT
= 0 mA
Input Selects Open, f
MAX
78 104
[11]
mW
Notes:
6. See the last page of this specification for Group A subgroup testing information.
7. These inputs are normally wired to V
CC
, GND, or left unconnected (actual threshold voltages vary as a percentage of V
CC
). Internal termination resistors hold
unconnected inputs at V
CC
/2. If these inputs are switched, the function and timing of the outputs may glitch and the PLL may require an additional t
LOCK
time
before all datasheet limits are achieved.
8. CY7B991 should be tested one output at a time, output shorted for less than one second, less than 10% duty cycle. Room temperature only. CY7B992 outputs
should not be shorted to GND. Doing so may cause permanent damage.
9. Total output current per output pair can be approximated by the following expression that includes device current plus load current:
CY7B991: I
CCN
= [(4 + 0.11F) + [((835 – 3F)/Z) + (.0022FC)]N] x 1.1
CY7B992: I
CCN
= [(3.5+ 0.17F) + [((1160 – 2.8F)/Z) + (.0025FC)]N] x 1.1
Where
F = frequency in MHz
C = capacitive load in pF
Z = line impedance in ohms
N = number of loaded outputs; 0, 1, or 2
FC = F
<
C
10. Total power dissipation per output pair can be approximated by the following expression that includes device power dissipation plus power dissipation due to
the load circuit:
CY7B991: PD = [(22 + 0.61F) + [((1550 – 2.7F)/Z) + (.0125FC)]N] x 1.1
CY7B992: PD = [(19.25+ 0.94F) + [((700 + 6F)/Z) + (.017FC)]N] x 1.1
See note 9 for variable definition.
11. CMOS output buffer current and power dissipation specified at 50-MHz reference frequency.
(12 Seiten)
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