CY7B991-2 CYPRESS [Cypress Semiconductor], CY7B991-2 Datasheet - Page 3

• Manufacturer Part Number: CY7B991-2
• Description: Programmable Skew Clock Buffer
• Manufacturer: CYPRESS [Cypress Semiconductor]

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
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
Document #: 38-07138 Rev. **
(N/A)
(N/A)
(N/A)
(N/A)
1Fx
2Fx
MM
MH
HM
HH
LM
LH
ML
HL
LL
LL/HH
(N/A)
(N/A)
(N/A)
(N/A)
3Fx
4Fx
MM
MH
HM
HH
LM
LH
ML
HL
REFInput
FBInput
DIVIDED
INVERT
– 6t
– 4t
– 3t
– 2t
– 1t
+1t
+2t
+3t
+4t
+6t
0t
Figure 1. Typical Outputs with FB Connected to a Zero-Skew Output
U
U
U
U
U
U
U
U
U
U
U
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
Operating Range
Commercial
Industrial
Military
Notes:
4.
5.
FB connected to an output selected for “zero” skew (i.e., xF1 = xF0 =
MID).
Indicates case temperature.
Range
[5]
–55 C to +125 C
–40 C to +85 C
Temperature
0 C to +70 C
Ambient
[4]
7B991–3
CY7B991
CY7B992
5V
5V
5V
Page 3 of 15
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