CY7B991
CY7B992
Document #: 38-07138 Rev. **
Page 3 of 15
Test Mode
The TEST input is a three-level input. In normal system oper-
ation, this pin is connected to ground, allowing the
CY7B991/CY7B992 to operate as explained briefly above (for
testing purposes, any of the three-level inputs can have a re-
movable jumper to ground, or be tied LOW through a 100
Ω
resistor. This will allow an external tester to change the state
of these pins.)
If the TEST input is forced to its MID or HIGH state, the device
will operate with its internal phase locked loop disconnected,
and input levels supplied to REF will directly control all outputs.
Relative output to output functions are the same as in normal
mode.
In contrast with normal operation (TEST tied LOW). All outputs
will function based only on the connection of their own function
select inputs (xF0 and xF1) and the waveform characteristics
of the REF input.
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature .................................–65
°C to +150°C
Ambient Temperature with
Power Applied ............................................ –55
°C to +125°C
Supply Voltage to Ground Potential ...............–0.5V to +7.0V
DC Input Voltage ............................................–0.5V to +7.0V
Output Current into Outputs (LOW)............................. 64 mA
Static Discharge Voltage ........................................... >2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current ..................................................... >200 mA
Figure 1. Typical Outputs with FB Connected to a Zero-Skew Output[4]
FBInput
REFInput
– 6t U
– 4t U
– 3t U
– 2t U
– 1t U
0tU
+1t U
+2t U
+3t U
+4t U
+6t U
DIVIDED
INVERT
LM
LH
(N/A)
ML
(N/A)
MM
(N/A)
MH
(N/A)
HL
HM
LL/HH
HH
3Fx
4Fx
(N/A)
LL
LM
LH
ML
MM
MH
HL
HM
HH
(N/A)
(N/A)
(N/A)
1Fx
2Fx
7B991–3
Operating Range
Range
Ambient
Temperature
VCC
Commercial
0
°C to +70°C
5V
± 10%
Industrial
–40
°C to +85°C
5V
± 10%
Military[5]
–55
°C to +125°C
5V
± 10%
Notes:
4.
FB connected to an output selected for “zero” skew (i.e., xF1 = xF0 =
MID).
5.
Indicates case temperature.
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