CY7B991
CY7B992
[6]
Electrical Characteristics Over the Operating Range
CY7B991
CY7B992
Min. Max.
Parameter
Description
Test Conditions
Min.
Max.
Unit
V
Output HIGH Voltage
V
V
V
V
= Min., I
= Min., I
= –16 mA
=–40 mA
2.4
V
OH
CC
CC
CC
CC
OH
OH
V
–0.75
CC
V
Output LOW Voltage
= Min., I = 46 mA
0.45
V
OL
OL
= Min., I = 46 mA
0.45
OL
V
V
V
V
V
Input HIGH Voltage
(REF and FB inputs only)
2.0
V
V
1.35
–
V
CC
V
V
IH
CC
CC
Input LOW Voltage
(REF and FB inputs only)
–0.5
0.8
–0.5
1.35
IL
Three-Level Input HIGH
Voltage (Test, FS, xFn)
Min. ≤ V ≤ Max.
V
– 0.85
V
V
– 0.85
V
CC
V
IHH
IMM
ILL
CC
CC
CC
CC
[7]
Three-Level Input MID
Voltage (Test, FS, xFn)
Min. ≤ V ≤ Max.
V
/2 –
V
/2 +
V
/2 –
V /2 +
CC
500 mV
V
CC
CC
CC
500 mV
CC
[7]
500 mV
500 mV
Three-Level Input LOW
Voltage (Test, FS, xFn)
Min. ≤ V ≤ Max.
0.0
0.85
0.0
0.85
V
CC
[7]
I
I
I
I
I
I
I
InputHIGH LeakageCurrent
(REF and FB inputs only)
V
V
V
V
V
V
= Max., V = Max.
10
10
µA
µA
µA
µA
µA
mA
mA
IH
CC
CC
IN
Input LOW Leakage Current
(REF and FB inputs only)
= Max., V = 0.4V
–500
–50
–500
–50
IL
IN
Input HIGH Current
(Test, FS, xFn)
= V
CC
200
50
200
50
IHH
IMM
ILL
IN
Input MID Current
(Test, FS, xFn)
= V /2
IN
CC
Input LOW Current
(Test, FS, xFn)
= GND
–200
–250
–200
N/A
IN
Output Short Circuit
= Max., V
OUT
OS
CCQ
CC
[8]
Current
= GND (25°C only)
Operating Current Used by
Internal Circuitry
V
= V
=
Com’l
85
90
85
90
CCN
CCQ
Max., All Input
Selects Open
Mil/Ind
I
Output Buffer Current per
Output Pair
V
= V = Max.,
CCQ
= 0 mA
14
19
mA
CCN
CCN
[9]
I
OUT
Input Selects Open, f
MAX
PD
Power Dissipation per
Output Pair
V
= V
= 0 mA
= Max.,
78
104[11]
mW
CCN
CCQ
[10]
I
OUT
Input Selects Open, f
MAX
Notes:
6. See the last page of this specification for Group A subgroup testing information.
7. These inputs are normally wired to VCC, GND, or left unconnected (actual threshold voltages vary as a percentage of VCC). Internal termination resistors hold
unconnected inputs at VCC/2. If these inputs are switched, the function and timing of the outputs may glitch and the PLL may require an additional tLOCK 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: ICCN = [(4 + 0.11F) + [((835 – 3F)/Z) + (.0022FC)]N] x 1.1
CY7B992: ICCN = [(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.
4
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