ICS9179-12 Datasheet, PDF (1/9 Pages) Integrated Circuit Systems – 3 DIMM Buffer

Integrated
Circuit
Systems, Inc.
ICS9179 - 12
3 DIMM Buffer
General Description
The ICS9179-12 is a buffer intended for reduced pin count
2 - chip Intel BX chipset designs
An I²C interface is included, enabling individual outputs to be
turned on or off. With 13 outputs, up to 3 DIMMs are supported.
Features
• Thirteen high speed, low noise buffers, supports up to
three SDRAM DIMMs.
• Buffer outputs skew matched to within 250 ps.
• I²C Serial Configuration interface to allow individual
OUTPUTs to be stopped low.
• Multiple VDD, VSS pins for noise reduction
• 3.3V±5% supply voltage
• 28-pin SOIC and SSOP package
• Propagation delay between 1 to 5.5ns
• Operation to 133MHz at 3.3V±5%
Block Diagram
Pin Configuration
Power Groups
VDD (0:4), GND (0:4) = Power supply for OUTPUT buffer
VDDI, GNDI = Power supply for I²C circuitry
9179-12 Rev C 7/16/99
28-Pin SOIC and SSOP
* Internal pull-up resistor of 100K
Ohms to 3.3V on indicated inputs
PentiumPro is a trademark of Intel Corporation
I²C is a trademark of Philips Corporation
PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.