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QS5818 ADVANCE INFORMATION
QUALITY SEMICONDUCTOR, INC.
Skew Clock Driver/ Buffer Desktop with DIMMS
QS5818 ADVANCE INFORMATION
DESCRIPTION
QS5818 high speed, noise noninverting buffer designed SDRAM clock buffer applications. outputs used drive four SDRAM DIMMs, remaining used external feedback PLL. QS5818 also includes interface, which enable disable each output clock driver. Turning unused outputs reduces EMI.
output buffer/driver Tri-state testing programming capability Power Supply Voltage 3.3V Skew outputs (<250ps) Multiple noise reduction SSOP package
Figure Functional Block Diagram
SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM
BUF_IN SDATA DECODING PORT
SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM
SCLK
MDSC-00039-02 SEPTEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS5818 ADVANCE INFORMATION Figure Configuration (All Pins View)
SSOP
SDRAM SDRAM SDRAM SDRAM BUF_IN SDRAM SDRAM SDRAM SDRAM SDRAM VDDI2C SDATA SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM GNDI2C SCLK
Table Description
Name SDRAM (0:3) SDRAM (4:7) SDRAM (8:11) SDRAM (12:15) SDRAM (16:17) BUF_IN SDATA SCLK GNDI2C VDDI2C
Number 1,2,47,48 4,5,8,9 13,14,17,18 31,32,35,36 40,41,44,45 21,28 3,7,12,16,20, 29,33,37,42,46 6,10,15,19,22, 27,30,34,39,43
Type
Functional Description Pins internally connected. SDRAM Byte Clock outputs. SDRAM Byte Clock outputs. SDRAM Byte Clock outputs. SDRAM Byte Clock outputs. SDRAM Clock Outputs useable feedback. Input buffers. Tri-state output enable. Includes internal pull VDD. When asserted LOW, clock outputs high impedance. Data Pin. Includes internal pull VDD. Clock Pin. Includes internal pull VDD. 3.3V power supply output buffers. Ground output buffers Ground circuitry. 3.3V power supply circuitry.
QUALITY SEMICONDUCTOR, INC.
MDSC-00039-02 SEPTEMBER 1998
QS5818 ADVANCE INFORMATION Table Absolute Maximum Ratings
Supply Voltage Ground -0.5V 4.6V Output Voltage VOUT -0.5V 4.6V Input Voltage -0.5V 4.6V Input Diode Current with -20mA Maximum Power Dissipation 85°C, 600mW TSTG Storage Temperature -65° 150°C
Note: Stresses greater than those listed under absolute maximum ratings cause permanent damage devices that result functional reliability type failures.
Table Recommended Operating Conditions
Symbol Parameter Power Supply Voltage Operating Temperature Load Capacitance Input Capacitance
3.135
3.465
Unit
MDSC-00039-02 SEPTEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS5818 ADVANCE INFORMATION Table Electrical Characteristics Over Operating Range
Symbol Parameter Input High Voltage Input Voltage Test Condition inputs inputs except inputs inputs (SDATA SCLK) Input High Input Current Input Current BUF_IN SDATA, SCLK Supply Current 0pF; 66.66MHz(1) 0pF; 100MHz(1) 30pF; 66.66MHz(1) 30pF; 100MHz(1) BUF_IN VDD, other inputs Output High Voltage SDRAM(0:17) -36mA Output Voltage SDRAM(0:17) 25mA Output Voltage SDATA IOLI2C -100 Unit
VOLI2C
Table Electrical Characteristics Over Operating Range
Symbol
TPHL TPLH TPZL TPZH TPLZ TPHZ
Skew (output output)(1) Propagation Delay Enable Delay Disable Delay 1.5V Figure 1.5V Figure
Parameter Rise Time(1) Fall Time(1) Duty Cycle(1) Test Condition 0.4V 2.4V; 30pF 2.4V 0.4V; 30pF 1.5V; 30pF; With Input Clock 1.5V; 30pF outputs Figure 1.5V
Unit
Note: Applies SDRAM(0:17) outputs. Guaranteed design, subject 100% production testing.
QUALITY SEMICONDUCTOR, INC.
MDSC-00039-02 SEPTEMBER 1998
QS5818 ADVANCE INFORMATION Serial Interface Control
interface permits individual enable/disable each clock output: unused outputs disabled reduce EMI. QS5818 slave receiver device. read back data stored latches verification. data transfer rate supported interface 100K bits/sec. Data transferred bytes (with addition start, stop, acknowledge bits) sequential order from lowest highest byte with ability stop after complete byte been transferred. first bytes transferred must Command Code followed Byte Count. Both these bytes ignored device. address QS5818
Address read/write writes reads. During read back, first byte read Byte Count representing number bytes following (fixed
Table Serial Configuration Command Bitmaps
Byte SDRAM Active/Inactive Register Enable, Disable, outputs held low), Default Enable
Description SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive)
Byte SDRAM Active/Inactive Register Enable, Disable, outputs held low), Default Enable
Description SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive) SDRAM (Active/Inactive)
Byte SDRAM Active/Inactive Register Enable, Disable, outputs held low), Default Enable
Description SDRAM (Active/Inactive) SDRAM (Active/Inactive) Reserved, power Reserved, power Reserved, power Reserved, power Reserved, power Reserved, power
MDSC-00039-02 SEPTEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS5818 ADVANCE INFORMATION Figure Test Circuit
Pulse Generator VOUT 7.0V Parameter Switch Tested Position Closed tPLZ, tPZL Others Coax Oscilloscope Open
30pF
Figure Timing Diagram
ENABLE
DISABLE
CONTROL INPUT OUTPUT NORMALLY tPZL SWITCH CLOSED tPZH 0.5VCC 0.5VCC
tPLZ 0.3V tPHZ 0.3V
1.5V 3.5V
INPUT
OUTPUT NORMALLY HIGH
SWITCH OPEN
Enable Disable Times
1.5V tPLH OUTPUT tPHL 2.0V 0.5VCC 0.8V
OUTPUT tPLH tPHL INPUT
1.5V 0.5VCC
Propagation Delay
Pulse Skew tSK(p)
QUALITY SEMICONDUCTOR, INC.
MDSC-00039-02 SEPTEMBER 1998
QS5818 ADVANCE INFORMATION Figure Ordering Information
Clock Management Product Prefix (QS5) Part Number Package (300-mil SSOP)
Figure Packaging Information 300-mil SSOP Package Code
Shrink Small Outline Package Plastic Small Outline Gull-Wing
Notes: Refer applicable symbol list. dimensions inches. number lead positions. Dimensions measured maximum material condition include mold flash. Allowable mold flash 0.006in. side. Lead coplanarity 0.004in. maximum.
SEATING PLANE
DWG# Symbol
MO-118AA PSS-48B 0.102 0.012 0.010 0.008 0.625 0.295 0.025 0.410 0.030 0.025
JEDEC#
MO-118AB PSS-56B 0.110 0.116 0.0135 0.010 0.630 0.299 0.420 0.040 0.028 0.095 0.008 0.008 0.005 0.720 0.291 0.395 0.020 0.022 0.102 0.012 0.010 0.008 0.725 0.295 0.025 0.410 0.030 0.025 0.028 0.420 0.040 0.110 0.016 0.0135 0.010 0.730 0.299
0.095 0.008 0.008 0.005 0.620 0.291 0.395 0.020
0.022
MDSC-00039-02 SEPTEMBER 1998
QUALITY SEMICONDUCTOR, INC.
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