cy7b9945v Cypress Semiconductor Corporation., cy7b9945v Datasheet - Page 4

• Manufacturer Part Number: cy7b9945v
• Description: High-speed Multi-phase Pll Clock Buffer
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-07336 Rev. *E
Output Disable Description
The output of each output bank can be independently put into
a HOLD-OFF or high-impedance state. The combination of the
MODE and DIS[1:2] inputs determines the clock outputs’ state
for each bank. When the DIS[1:2] is LOW, the outputs of the
corresponding banks will be enabled. When DIS[1:2] is HIGH,
the outputs for that bank will be disabled to a high-impedance
(HI-Z) or HOLD-OFF state. Table 5 defines the disabled
outputs functions.
The HOLD-OFF state is intended to be a power saving feature.
An output bank is disabled to the HOLD-OFF state in a
maximum of six output clock cycles from the time when the
disable input is HIGH. When disabled to the HOLD-OFF state,
Note:
(N/A)
(N/A)
(N/A)
3.
1F[1:0]
1F[3:2]
(N/A)
(N/A)
(N/A)
MM
LM
LH
ML
MH
LL
HL
HM
HH
FB connected to an output selected for “Zero” skew (i.e., FBF0 = MID or XF[1:0] = MID).
(N/A)
(N/A)
(N/A)
(N/A)
(N/A)
(N/A)
(N/A)
(N/A)
2F[1:0]
MM
HL
LL
LM
HM
LH
HH
REFInput
FBInput
+1t
+2t
+3t
+6t
+7t
+8t
–2t
+4t
–8t
–7t
–6t
–4t
–3t
–1t
0t
Figure 1. Typical Outputs with FB Connected to a Zero-Skew Output
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
outputs are driven to a logic LOW state on their falling edges.
This ensures the output clocks are stopped without a glitch.
When a bank of outputs is disabled to HI-Z state, the
respective bank of outputs will go HI-Z immediately.
Table 5. DIS[1:2] Functionality
HIGH/LOW
MODE
HIGH
LOW
MID
DIS[1:2]
HIGH
HIGH
LOW
X
[3]
RoboClock
1Q[0:3], 2Q[0:5]
FACTORY TEST
CY7B9945V
HOLD-OFF
ENABLED
HI-Z
Page 4 of 10

[+] Feedback