Selectable positive or negative edge synchronization
Synchronous output enable
Output frequency: 15MHz to 85MHz
3 skew grades:
IDT5V9910A-2: t
SKEW0
<250ps
IDT5V9910A-5: t
SKEW0
<500ps
IDT5V9910A-7: t
SKEW0
<750ps
3-level inputs for PLL range control
PLL bypass for DC testing
External feedback, internal loop filter
12mA balanced drive outputs
Low Jitter: <200ps peak-to-peak
Available in SOIC package
IDT5V9910A
DESCRIPTION:
The IDT5V9910A is a high fanout phase locked-loop clock driver
intended for high performance computing and data-communications appli-
cations. It has eight zero delay LVTTL outputs.
When the GND/sOE pin is held low, all the outputs are synchronously
enabled. However, if GND/sOE is held high, all the outputs except Q
2
and
Q
3
are synchronously disabled.
Furthermore, when the V
CCQ
/PE is held high, all the outputs are
synchronized with the positive edge of the REF clock input. When V
CCQ
/
PE is held low, all the outputs are synchronized with the negative edge of
REF.
The FB signal is compared with the input REF signal at the phase detector
in order to drive the VCO. Phase differences cause the VCO of the PLL to
adjust upwards or downwards accordingly.
An internal loop filter moderates the response of the VCO to the phase
detector. The loop filter transfer function has been chosen to provide minimal
jitter (or frequency variation) while still providing accurate responses to input
frequency changes.
•
•
•
•
•
•
FUNCTIONAL BLOCK DIAGRAM
V
CCQ
/PE
GND/sOE
Q
0
Q
1
Q
2
Q
3
PLL
REF
Q
4
Q
5
FS
Q
6
Q
7
FB
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
c
2001
Integrated Device Technology, Inc.
SEPTEMBER 2001
DSC 5847/1
IDT5V9910A
3.3V LOW SKEW PLL CLOCK DRIVER TURBOCLOCK JR.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
I
Description
Supply Voltage to Ground
DC Input Voltage
REF Input Voltage
Maximum Power Dissipation (T
A
= 85°C)
T
STG
Storage Temperature
Max
–0.5 to +7
–0.5 to V
CC
+0.5
–0.5 to +5.5
530
–65 to +150
Unit
V
V
V
mW
°C
REF
V
CC Q
FS
NC
V
C C Q
/P E
V
C CN
Q
0
Q
1
G ND
Q
2
Q
3
V
C CN
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
G ND
TE ST
NC
G ND/sO E
V
CCN
Q
7
Q
6
G ND
Q
5
Q
4
V
CCN
FB
NOTE:
1. Stresses beyond those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability.
CAPACITANCE
(T
A
= +25°C, f = 1MHz, V
IN
= 0V)
Parameter
C
IN
Description
Input Capacitance
Typ.
5
Max.
7
Unit
pF
SOIC
TOP VIEW
NOTE:
1. Capacitance applies to all inputs except TEST and FS. It is characterized but not
production tested.
PIN DESCRIPTION
Pin Name
REF
FB
TEST
(1)
GND/
sOE
(1)
V
CCQ
/PE
FS
(2)
Type
IN
IN
IN
IN
IN
IN
Description
Reference Clock Input
Feedback Input
When MID or HIGH, disables PLL (except for conditions of Note 1). REF goes to all outputs. Set LOW for normal operation.
Synchronous Output Enable. When HIGH, it stops clock outputs (except Q
2
and Q
3
) in a LOW state - Q
2
and Q
3
may be used as the
feedback signal to maintain phase lock. Set GND/sOE LOW for normal operation.
Selectable positive or negative edge control. When LOW/HIGH the outputs are synchronized with the negative/positive edge of the
reference clock.
Frequency range select:
FS = GND: 15 to 35MHz
FS = MID (or open): 25 to 60MHz
FS = V
CC
: 40 to 85MHz
Q
0
- Q
7
V
CCN
V
CCQ
GND
OUT
PWR
PWR
PWR
Eight clock output
Power supply for output buffers
Power supply for phase locked loop and other internal circuitry
Ground
NOTES:
1. When TEST = MID and GND/sOE = HIGH, PLL remains active.
2. This input is wired to Vcc, GND, or unconnected. Default is MID level. If it is switched in the real time mode, the outputs may glitch, and the PLL may require an additional
lock time before all data sheet limits are achieved.
2
IDT5V9910A
3.3V LOW SKEW PLL CLOCK DRIVER TURBOCLOCK JR.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
RECOMMENDED OPERATING RANGE
IDT5V9910A-5, -7
(Industrial)
Symbol
V
CC
T
A
Description
Power Supply Voltage
Ambient Operating Temperature
Min.
3
-40
Max.
3.6
+85
3
0
IDT5V9910A-2
(Commercial)
Min.
Max.
3.6
+70
Unit
V
°C
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol
V
IH
V
IL
V
IHH
V
IMM
V
ILL
I
IN
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Voltage
(1)
Input MID Voltage
(1)
Input LOW Voltage
(1)
Input Leakage Current
(REF, FB Inputs Only)
I
3
I
PU
I
PD
V
OH
V
OL
3-Level Input DC Current (TEST, FS)
Input Pull-Up Current (V
CCQ
/PE)
Input Pull-Down Current (GND/sOE)
Output HIGH Voltage
Output LOW Voltage
Conditions
Guaranteed Logic HIGH (REF, FB Inputs Only)
Guaranteed Logic LOW (REF, FB Inputs Only)
3-Level Inputs Only
3-Level Inputs Only
3-Level Inputs Only
V
IN
= V
CC
or GND
V
CC
= Max.
V
IN
= V
CC
V
IN
= V
CC
/2
V
IN
= GND
V
CC
= Max., V
IN
= GND
V
CC
= Max., V
IN
= V
CC
V
CC
= Min., I
OH
=
−
12mA
V
CC
= Min., I
OL
= 12mA
HIGH Level
MID Level
LOW Level
—
—
—
—
—
2.4
—
±200
±50
±200
±100
±100
—
0.55
µA
µA
V
V
µA
Min.
2
—
V
CC
/2
−
0.3
—
—
V
CC
−
0.6
Max.
—
0.8
—
V
CC
/2+0.3
0.6
±5
Unit
V
V
V
V
V
µA
NOTE:
1. These inputs are normally wired to V
CC
, GND, or unconnected. Internal termination resistors bias unconnected inputs to V
CC
/2. If these inputs are switched, the function and
timing of the outputs may be glitched, and the PLL may require an additional t
LOCK
time before all datasheet limits are achieved.
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
I
TOT
Parameter
Quiescent Power Supply Current
Power Supply Current per Input HIGH
Dynamic Power Supply Current per Output
Total Power Supply Current
Test Conditions
(1)
V
CC
= Max., TEST = MID, REF = LOW,
GND/sOE = LOW, All outputs unloaded
V
CC
= Max., V
IN
= 3V
V
CC
= Max., C
L
= 0pF
V
CC
= 3.3V, F
REF
= 25MHz, C
L
= 160pF
(1)
V
CC
= 3.3V, F
REF
= 33MHz, C
L
= 160pF
(1)
V
CC
= 3.3V, F
REF
= 66MHz, C
L
= 160pF
(1)
NOTE:
1. For eight outputs, each loaded with 20pF.
Typ.
(2)
8
1
55
34
42
76
Max.
25
30
90
—
—
—
Unit
mA
µA
µA/MHz
mA
3
IDT5V9910A
3.3V LOW SKEW PLL CLOCK DRIVER TURBOCLOCK JR.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
INPUT TIMING REQUIREMENTS
Symbol
t
R
, t
F
t
PWC
D
H
R
EF
Description
(1)
Maximum input rise and fall times, 0.8V to 2V
Input clock pulse, HIGH or LOW
Input duty cycle
Reference clock input
Min.
—
3
10
15
Max.
10
—
90
85
Unit
ns/V
ns
%
MHz
NOTE:
1. Where pulse width implied by D
H
is less than t
PWC
limit, t
PWC
limit applies.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
IDT5V9910A-2
Symbol Parameter
FS = LOW
F
REF
t
RPWH
t
RPWL
t
SKEW0
t
DEV
t
PD
t
ODCV
t
ORISE
t
OFALL
t
LOCK
t
JR
REF Frequency Range
REF Pulse Width HIGH
(8)
REF Pulse Width LOW
(8)
Zero Output Skew (All Outputs)
(1,3,4)
Device-to-Device Skew
(1,2,5)
REF Input to FB Propagation Delay
(1,7)
Output Duty Cycle Variation from 50%
(1)
Output Rise Time
(1)
Output Fall Time
(1)
PLL Lock Time
(1,6)
Cycle-to-Cycle Output Jitter
(1)
RMS
Peak-to-Peak
FS = MED
FS = HIGH
Min.
15
25
40
3
3
—
—
Typ.
—
—
—
—
—
0.1
—
0
0
1
1
—
—
—
Max.
35
60
85
—
—
0.25
0.75
0.25
1.2
1.2
1.2
0.5
25
200
Min.
15
25
40
3
3
—
—
IDT5V9910A-5
Typ.
—
—
—
—
—
0.25
—
0
0
1
1
—
—
—
Max.
35
60
85
—
—
0.5
1.25
0.5
1.2
1.5
1.5
0.5
25
200
15
25
40
3
3
—
—
IDT5V9910A-7
Min.
Typ.
—
—
—
—
—
0.3
—
0
0
1.5
1.5
—
—
—
Max.
35
60
85
—
—
0.75
1.65
0.7
1.2
2.5
2.5
0.5
25
200
ns
ns
ns
ns
ns
ns
ns
ns
ms
ps
MHz
Unit
−
0.25
−
1.2
0.15
0.15
—
—
—
−
0.5
−
1.2
0.15
0.15
—
—
—
−
0.7
−
1.2
0.15
0.15
—
—
—
NOTES:
1. All timing and jitter tolerances apply for F
NOM
> 25MHz.
2. Skew is the time between the earliest and the latest output transition among all outputs with the specified load.
3. t
SKEW
is the skew between all outlets. See AC TEST LOADS.
4. For IDT5V9910A-2 t
SKEW0
is measured with C
L
= 0pF; for C
L
= 20pF, t
SKEW0
= 0.35ns Max.
5. t
DEV
is the output-to-output skew between any two devices operating under the same conditions (V
CC
, ambient temperature, air flow, etc.)
6. t
LOCK
is the time that is required before synchronization is achieved. This specification is valid only after V
CC
is stable and within normal operating limits. This parameter is
measured from the application of a new signal or frequency at REF or FB until t
PD
is within specified limits.
7. t
PD
is measured with REF input rise and fall times (from 0.8V to 2V ) of 1ns.
8. Refer to INPUT TIMING REQUIREMENTS for more detail.
4
IDT5V9910A
3.3V LOW SKEW PLL CLOCK DRIVER TURBOCLOCK JR.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
AC TEST LOADS AND WAVEFORMS
≤
1ns
≤
1ns
V
CC
3.0V
2.0V
Vth =1.5V
150
Ω
Outpu t
0.8V
0V
LVTTL Input Test Waveform
150
Ω
20p F
t
O R ISE
t
OF AL L
Test Load
2.0V
0.8V
LVTTL Output Waveform
AC TIMING DIAGRAM
t
R EF
t
R PW H
REF
t
RP W L
t
PD
t
O D CV
t
O D CV
FB
t
JR
Q
t
S K EW
t
SK E W
OTHER Q
NOTES:
Skew:
t
SKEW
:
t
DEV
:
t
ODCV
:
t
LOCK
:
The time between the earliest and the latest output transition among all outputs when all are loaded with 20pF and terminated with 75Ω to V
CC
/2.
The skew between all outputs.
The output-to-output skew between any two devices operating under the same conditions (V
CC
, ambient temperature, air flow, etc.)
The deviation of the output from a 50% duty cycle.
The time that is required before synchronization is achieved. This specification is valid only after V
CC
is stable and within normal operating limits. This parameter
is measured from the application of a new signal or frequency at REF or FB until t
便携式数字数据采集系统（PDDAS）使用了LabVIEW实时模块和PXI，以控制风洞测试和采集记录来自128个不同通道的空气压力数据 "通过LabVIEW实时模块，可以在各种操作情况下获得采集空气压力数据及向风洞提供反馈控制信号所需的确定性响应时间。" – Dave Scheibenhoffer, G Systems 挑战: 用一个可采集、分析和存储来自下一代喷气式战斗机引擎设计的动...[详细]
介绍如何利用现代化布线设计工具集来应对复杂性的挑战。选项代码和表达式可以模拟汽车项目的变量。功能齐全的工具套件可以获取以约束形式被采用的最佳实践和规则。自动化可以帮助设计师稳定、连贯且低成本地管理复杂性。
Mentor Graphics国际 Capital 套件设计环境中的自动布线合成流程
Simon Holdsworth 表示：“利用规则和约束来指导一系列“变化与影响”的计算，...[详细]
为我们提建议&公告
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
