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PDF GA1086 Data sheet ( Hoja de datos )
| Número de pieza | GA1086 | |
| Descripción | 11-Output Clock Buffer | |
| Fabricantes | TriQuint Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de GA1086 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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TRIQUINT
S E M I C O N D U C T O R, I N C .
Figure 1. Block Diagram
FBIN S1 CLK S0 NC NC GND
11 10 9 8 7 6 5
S2 12
VDD 13
Q/2 14
GND 15
FBOUT 16
Q1 17
VDD 18
Control
Logic
Phase
Detector
VCO
Divide
Logic
MUX
Precision
Output
Buffers
4 VDD
3 Q9
2 Q8
1 GND
28 Q7
27 Q6
26 VDD
19 20 21 22 23
GND Q2 Q3 VDD Q4
24 25
Q5 GND
TriQuint’s GA1086 operates from 30 MHz to 67 MHz. This TTL-level clock
buffer chip supports the tight timing requirements of high-performance
microprocessors, with near zero input-to-output delay and very low pin-to-
pin skew. The device offers 10 usable outputs synchronized in phase and
frequency to a periodic clock input signal. One of the ten outputs is a one-
half clock output (CLK ÷ 2). With split termination, the GA1086 can be
used to drive up to nineteen 15 pF loads, as shown in Figure 10.
The tight control over phase and frequency of the output clocks is achieved
with a 400 MHz internal Phase-Locked Loop (PLL). By feeding back one of
the output clocks to FBIN, the on-chip PLL continuously maintains
synchronization between the input clock (CLK) and all ten outputs. Any
drift or gradual variation in the system clock is matched and tracked at the
ten outputs. The GA1086 output buffers are symmetric, each sourcing and
sinking up to 30 mA of drive current. For diagnostic purposes, the device
has a test mode which is used to test the device and associated logic by
single-stepping through the control logic.
GA1086
11-Output
Clock Buffer
Features
• Operates from 30 MHz to 67MHz
• Pin-to-pin output skew of
250 ps (max)
• Period-to-period jitter:
75 ps (typ)
• Near-zero propagation delay:
–350 ps ± 500 ps or
–350 ps ± 1000 ps
• 10 symmetric, TTL-compatible
outputs with 30 mA drive and
rise and fall times of 1.4 ns(max)
• 28-pin J-lead surface-mount
package
• Special test mode
• Meets or exceeds Pentium™
processor timing requirements
• Typical applications include
low-skew clock distribution for:
• RISC- or CISC-based systems
• Multi-processor systems
• High-speed backplanes
The GA1086 is fabricated using TriQuint’s One-Up™ gallium arsenide
technology to achieve precise timing control and to guarantee 100% TTL
compatibility. The output frequency makes this device ideal for clock
generation and distribution in a wide range of high-performance
microprocessor-based systems. Many other CISC- and RISC-based
systems will also benefit from its tight control of skew and delay.
For additional information and latest specifications, see our website: www.triquint.com
1
1 page  
GA1086
Multi-Processor Systems (cont.)
Figure 5 shows a 4-processor system with various
33 MHz memory banks synchronized to the 66 MHz
CPUs. The GA1110E, a custom device whose six
outputs can be individually configured, (see
GA1110E data sheet), is used as the clock source for
the GA1086 devices. This configuration gives the user
18 copies of the 66 MHz clock and 7 copies of the 33
MHz clock. By using the configurability of the
GA1110E, the user can also specify and control the
placement of the edges of the outputs of the GA1110E.
Figure 5. Generating Multiple Outputs
R
33 MHz
FBIN FBOUT
GA1000
Q1
Q2
Q3
CLK Q4
Q5
33 MHz
33M6H6zMHz
–t 3
– 2t 4 @ 33 MHz
– 3t
FBIN FBOUT
Q1
GA1086
6 pF MC500
CLK
Q9
Q/2
R
Note: The GA1000 is a custom device whose outputs
can be customized to the user's requirement.
The figure above is one possible configuration.
Max Pin-to-Pin Skew from:
1 to 2 = 1.2 ns*
1 to 3 = 1.75 ns
1 to 4 = 1.5 ns
2 to 3 = 2.7 ns*
2 to 5 = 3.2 ns*
3 to 4 = 1.75 ns
3 to 5 = 2.7 ns*
4 to 5 = 1.2 ns*
FBIN FBOUT
Q1
GA1086
6 pF MC500
CLK
Q9
Q/2
* Assumes maximum skew between Q9 and Q/2 is 1.2 ns. See AC specifications.
1
9 @ 66 MHz
2
33 MHz
4
9 @ 66 MHz
5
33 MHz
For additional information and latest specifications, see our website: www.triquint.com
5
5 Page 
GA1086
28-Pin MQuad J-Leaded Package Mechanical Specification
(All dimensions are in inches)
.045
X 45°
.490 ±.005
.445 ±.005
.132 ±.005
0.125
VENT PLUG
8
.015
X 45°
PIN 1
22
.490
±.005
.445
±.005
15
.050 TYP.
NON-ACCUM.
.445 .028
±.005
.104
±.005
.172 ±.005
.040 MIN
.410
.018 ±.015
.050 TYP.
.060
28-Pin MQuad Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
GND
Q8
Q9
VDD
GND
N/C
N/C
S0
CLK
S1
FBIN
S2
VDD
Q/2
Description
Ground
Output Clock 8
Output Clock 9
+5 V
Ground
No Connect
No Connect
Select 0
Reference Clock
Select 1
Feedback In
Select 2
+5 V
Half-Clock Out
I/O
–
O
O
–
–
–
–
I
I
I
I
I
–
O
Pin #
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin Name
GND
FBOUT
Q1
VDD
GND
Q2
Q3
VDD
Q4
Q5
GND
VDD
Q6
Q7
Description
Ground
Feedback Clock
Output Clock 1
+5 V
Ground
Output Clock 2
Output Clock 3
+5 V
Output Clock 4
Output Clock 5
Ground
+5 V
Output Clock 6
Output Clock 7
I/O
–
O
O
–
–
O
O
–
O
O
–
–
O
O
For additional information and latest specifications, see our website: www.triquint.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet GA1086.PDF ] | |
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