Electrical characteristics – Cypress CY7B991 User Manual
Page 6
CY7B991
CY7B992
Document Number: 38-07138 Rev. *B
Page 6 of 19
Electrical Characteristics
Over the Operating Range
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)
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)
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)
Min
≤ V
CC
≤
Maximum
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
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
V
CCN
= V
CCQ
= Max,
I
OUT
= 0 mA
Input Selects Open, f
MAX
14
19
mA
PD
Power Dissipation per
Output Pair
V
CCN
= V
CCQ
= Max,
I
OUT
= 0 mA
Input Selects Open, f
MAX
78
104
mW
Notes
6. For more information see
.
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 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:
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. Applies to REF and FB inputs only. Tested initially and after any design or process changes that may affect these parameters.