7B991RPFI
器件描述：Programmable Skew Clock Buffer (PSCB)
器件厂商：MAXWELL [Maxwell Technologies]
文件大小：253.76KB，共17页
Sponsor by e络盟器件资料摘要：
1
Memory
All data sheets are subject to change without notice
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
Programmable Skew
7B991
©2002 Maxwell Technologies.
All rights reserved.
Clock Buffer (PSCB)
09.23.02 Rev 4
FEATURES:
• All output pair skew < 100 ps typical (250 max.)
3.75 to 80 MHz output operation
User-selectable output functions
Selectable skew to 18 ns
Inverted and non-inverted
Operation at ½ and ¼ input frequency
Operation at 2x and 4x input frequency (input as low as
3.75 MHz)
Zero input to output delay
50% duty-cycle outputs
Outputs drive 50Ω terminated lines
Low operating current
Package: 32-pin RAD-PAK® flat package
Jitter < 200 ps peak-to-peak (< 25 ps RMS)
Compatible with Pentium™-based processor
Total dose hardness:
- >100 krads (Si), depending upon space mission
Excellent Single Event Effects:
- SEL > 116MeV/mg/cm
2
- SEU
TH
-3 MeV/mg/cm
2
- SEU sat cross section: 1E-3/device
DESCRIPTION:
Maxwell Technologies’ 7B991 Programmable Skew Clock
Buffers (PSCB) offer user-selectable control over system
clock functions. These multiple-output clock drivers provide
the system integrator with functions necessary to optimize tim-
ing of high-performance computer systems. Eight individual
drivers, arranged as four pairs of user-controllable outputs,
can each drive terminated transmission lines with impedances
as low as 50Ω while delivering minimal and specified output
skews and full-swing logic levels.
Each output can be hardwired to one of nine delay or function
configurations. Delay increments of 0.7 to 1.5 ns are deter-
mined by the operating frequency with outputs able to skew up
to ± 6 time units from their nominal “zero” skew position. The
completely integrated PLL allows external load and transmis-
sion line delay effects to be canceled. When this “zero delay”
capability of the PSCB is combined with the selectable output
skew functions, the user can create output-to-output delays of
up to ±12 time units.
Maxwell Technologies' patented RAD-PAK® packaging technol-
ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, RAD-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
Logic Diagram
Memory
All data sheets are subject to change without notice
(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com
Programmable Skew
7B991
©2002 Maxwell Technologies.
All rights reserved.
Clock Buffer (PSCB)
09.23.02 Rev 4
FEATURES:
• All output pair skew < 100 ps typical (250 max.)
3.75 to 80 MHz output operation
User-selectable output functions
Selectable skew to 18 ns
Inverted and non-inverted
Operation at ½ and ¼ input frequency
Operation at 2x and 4x input frequency (input as low as
3.75 MHz)
Zero input to output delay
50% duty-cycle outputs
Outputs drive 50Ω terminated lines
Low operating current
Package: 32-pin RAD-PAK® flat package
Jitter < 200 ps peak-to-peak (< 25 ps RMS)
Compatible with Pentium™-based processor
Total dose hardness:
- >100 krads (Si), depending upon space mission
Excellent Single Event Effects:
- SEL > 116MeV/mg/cm
2
- SEU
TH
-3 MeV/mg/cm
2
- SEU sat cross section: 1E-3/device
DESCRIPTION:
Maxwell Technologies’ 7B991 Programmable Skew Clock
Buffers (PSCB) offer user-selectable control over system
clock functions. These multiple-output clock drivers provide
the system integrator with functions necessary to optimize tim-
ing of high-performance computer systems. Eight individual
drivers, arranged as four pairs of user-controllable outputs,
can each drive terminated transmission lines with impedances
as low as 50Ω while delivering minimal and specified output
skews and full-swing logic levels.
Each output can be hardwired to one of nine delay or function
configurations. Delay increments of 0.7 to 1.5 ns are deter-
mined by the operating frequency with outputs able to skew up
to ± 6 time units from their nominal “zero” skew position. The
completely integrated PLL allows external load and transmis-
sion line delay effects to be canceled. When this “zero delay”
capability of the PSCB is combined with the selectable output
skew functions, the user can create output-to-output delays of
up to ±12 time units.
Maxwell Technologies' patented RAD-PAK® packaging technol-
ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, RAD-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
Logic Diagram