參數(shù)資料
型號: IDT5V9955
廠商: Integrated Device Technology, Inc.
英文描述: Scan Test Devices With 18-Bit Bus Transceivers And Registers 64-LQFP -40 to 85
中文描述: 3.3V的可編程相偏雙PLL時鐘驅(qū)動器TURBOCLOCK糯
文件頁數(shù): 1/11頁
文件大小: 129K
代理商: IDT5V9955
1
INDUSTRIAL TEMPERATURE RANGE
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
J UNE 2002
2002 Integrated Device Technology, Inc.
DSC 5974/9
c
INDUS T RIAL T E MPE RAT URE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FEATURES:
Ref input is 5V tolerant
8 pairs of programmable skew outputs
Two separate A and B banks for individual control
Low skew: 185ps same pair, 250ps same bank, 350ps both
banks
Selectable positive or negative edge synchronization on each
bank: excellent for DSP applications
Synchronous output enable on each bank
Input frequency: 2MHz to 200MHz
Output frequency: 6MHz to 200MHz
3-level inputs for skew and PLL range control
3-level inputs for feedback divide selection multiply / divide
ratios of (1-6, 8, 10, 12) / (2, 4)
PLL bypass for DC testing
External feedback, internal loop filter
12mA balanced drive outputs
Low Jitter: <100ps cycle-to-cycle
Power-down mode on each bank
Lock indicator on each bank
Available in BGA package
FUNCTIONAL BLOCK DIAGRAM
B
FS
B
PE
B
LOCK
PLL
3
BsOE
/ N
3
3
B
FB
3
3
Skew
Skew
Skew
Skew
3
3
3
3
3
3
B1Q
0
B1Q
1
B1F1:0
B2Q
0
B2Q
1
B2F1:0
BDS1:0
B3Q
0
B3Q
1
B3F1:0
B4Q
0
B4Q
1
B4F1:0
BPD
3
A
FS
A
PE
A
LOCK
PLL
3
A
sOE
REF
/ N
3
3
A
FB
3
3
Skew
Select
3
3
3
3
3
3
A1Q
0
A1Q
1
A1F1:0
A2Q
0
A2Q
1
A2F1:0
ADS1:0
A3Q
0
A3Q
1
A3F1:0
A4Q
0
A4Q
1
A4F1:0
APD
TEST
3
Skew
Select
Skew
Select
Skew
Select
IDT5V9955
3.3V PROGRAMMABLE
SKEW DUAL PLL CLOCK
DRIVER TURBOCLOCK W
DESCRIPTION
The IDT5V9955 is a high fanout 3.3V PLL based clock driver intended
for high performance computing and data-communications applications. A
key feature of the programmable skew is the ability of outputs to lead or lag
the REF input signal. The IDT5V9955 has sixteen programmable skew
outputs in eight banks of 2. The two separate PLLs allow the user to
independently control A and B banks. Skew is controlled by 3-level input
signals that may be hard-wired to appropriate HIGH-MID-LOW levels.
The feedback input allows divide-by-functionality from1 to 12 through
the use of the xDS[1:0] inputs. This provides the user with frequency
multiplication from1 to 12 without using divided outputs for feedback.
When the x
sOE
pin is held low, all the xbank outputs are synchronously
enabled. However, if x
sOE
is held high, all the xbank outputs except x2Q0
and x2Q1 are synchronously disabled. The xLOCK is high when the
xbank PLL has achieved phase lock.
Furthermore, when xPE is held high, all the outputs are synchronized
with the positive edge of the REF clock input. When xPE is held low, all the
xbank outputs are synchronized with the negative edge of REF. The
IDT5V9955 has LVTTL outputs with 12mA balanced drive outputs.
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