CY7B991
CY7B992
Electrical Characteristics
Over the Operating Range[6]
CY7B991
CY7B992
Min Max
Parameter
Description
Test Conditions
VCC = Min IOH = –16 mA
VCC = Min, IOH =–40 mA
VCC = Min, IOL = 46 mA
VCC = Min, IOL = 46 mA
Min
Max
Unit
VOH
Output HIGH Voltage
2.4
V
VCC–0.75
VOL
Output LOW Voltage
0.45
V
0.45
VCC
VIH
VIL
Input HIGH Voltage
(REF and FB inputs only)
2.0
–0.5
VCC
0.8
VCC
–
V
V
1.35
Input LOW Voltage
(REF and FB inputs only)
–0.5
1.35
VCC
VIHH
VIMM
VILL
IIH
Three Level Input HIGH
Voltage (Test, FS, xFn)[10]
Min ≤ VCC ≤ Max
Min ≤ VCC ≤ Max
VCC – 0.85
VCC
VCC – 0.85
V
Three Level Input MID
VCC/2 –
500 mV
VCC/2 +
500 mV
VCC/2 –
500 mV
VCC/2 +
500 mV
V
Voltage (Test, FS, xFn)[10]
Three Level Input LOW
Min ≤ VCC
Maximum
≤
0.0
–500
–50
0.85
0.0
–500
–50
0.85
V
Voltage (Test, FS, xFn)[10]
InputHIGHLeakageCurrent VCC = Max, VIN = Max.
(REF and FB inputs only)
10
10
μA
μA
μA
μA
μA
mA
mA
IIL
Input LOW Leakage Current VCC = Max, VIN = 0.4V
(REF and FB inputs only)
IIHH
IIMM
IILL
Input HIGH Current
(Test, FS, xFn)
VIN = VCC
VIN = VCC/2
VIN = GND
200
50
200
50
Input MID Current
(Test, FS, xFn)
Input LOW Current
(Test, FS, xFn)
–200
–250
–200
N/A
IOS
Output Short Circuit
Current[8]
VCC = Max, VOUT
= GND (25°C only)
ICCQ
Operating Current Used by VCCN =VCCQ =Max, Com’l
Internal Circuitry
85
90
85
90
All Input
Selects Open
Mil/Ind
ICCN
Output Buffer Current per
Output Pair[9]
VCCN = VCCQ = Max,
14
19
mA
IOUT = 0 mA
Input Selects Open, fMAX
PD
Power Dissipation per
Output Pair[10]
VCCN = VCCQ = Max,
78
104[11]
mW
IOUT = 0 mA
Input Selects Open, fMAX
Notes
6. For more information see “Group A Subgroup Testing” on page 17.
7. These inputs are normally wired to V , GND, or left unconnected (actual threshold voltages vary as a percentage of V ). Internal termination resistors hold
CC
CC
unconnected inputs at V /2. If these inputs are switched, the function and timing of the outputs may glitch and the PLL may require an additional t
CC
time before
LOCK
all datasheet limits are achieved.
8. CY7B991 must be tested one output at a time, output shorted for less than one second, less than 10% duty cycle. Room temperature only. CY7B992 outputs must
not be shorted to GND. Doing so may cause permanent damage.
9. Total output current per output pairis approximated by the following expression that includes device current plus load current:
CY7B991:
CY7B992:
Where
I
I
= [(4 + 0.11F) + [((835 – 3F)/Z) + (.0022FC)]N] x 1.1
= [(3.5+ 0.17F) + [((1160 – 2.8F)/Z) + (.0025FC)]N] x 1.1
CCN
CCN
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. Applies to REF and FB inputs only. Tested initially and after any design or process changes that may affect these parameters.
Document Number: 38-07138 Rev. *B
Page 6 of 19
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