CY7B991
CY7B992
Document #: 38-07138 Rev. **
Page 4 of 15
Electrical Characteristics Over the Operating Range[6]
CY7B991
CY7B992
Parameter
Description
Test Conditions
Min.
Max.
Min.
Max.
Unit
VOH
Output HIGH Voltage
VCC = Min., IOH = –16 mA
2.4
V
VCC = Min., IOH =–40 mA
VCC–0.75
VOL
Output LOW Voltage
VCC = Min., IOL = 46 mA
0.45
V
VCC = Min., IOL = 46 mA
0.45
VIH
Input HIGH Voltage
(REF and FB inputs only)
2.0
VCC
VCC –
1.35
VCC
V
VIL
Input LOW Voltage
(REF and FB inputs only)
–0.5
0.8
–0.5
1.35
V
VIHH
Three-Level Input HIGH
Voltage (Test, FS, xFn)[7]
Min.
≤ V
CC ≤ Max.
VCC – 0.85
VCC
VCC – 0.85
VCC
V
VIMM
Three-Level Input MID
Voltage (Test, FS, xFn)[7]
Min.
≤ V
CC ≤ Max.
VCC/2 –
500 mV
VCC/2 +
500 mV
VCC/2 –
500 mV
VCC/2 +
500 mV
V
VILL
Three-Level Input LOW
Voltage (Test, FS, xFn)[7]
Min.
≤ V
CC ≤ Max.
0.0
0.85
0.0
0.85
V
IIH
Input HIGH Leakage Current
(REF and FB inputs only)
VCC = Max., VIN = Max.
10
10
µA
IIL
Input LOW Leakage Current
(REF and FB inputs only)
VCC = Max., VIN = 0.4V
–500
–500
µA
IIHH
Input HIGH Current
(Test, FS, xFn)
VIN = VCC
200
200
µA
IIMM
Input MID Current
(Test, FS, xFn)
VIN = VCC/2
–50
50
–50
50
µA
IILL
Input LOW Current
(Test, FS, xFn)
VIN = GND
–200
–200
µA
IOS
Output Short Circuit
Current[8]
VCC = Max., VOUT
= GND (25
°C only)
–250
N/A
mA
ICCQ
Operating Current Used by
Internal Circuitry
VCCN = VCCQ =
Max., All Input
Selects Open
Com’l
85
85
mA
Mil/Ind
90
90
ICCN
Output Buffer Current per
Output Pair[9]
VCCN = VCCQ = Max.,
IOUT = 0 mA
Input Selects Open, fMAX
14
19
mA
PD
Power Dissipation per
Output Pair[10]
VCCN = VCCQ = Max.,
IOUT = 0 mA
Input Selects Open, fMAX
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 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.
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