SKEW CLOCK DRIVER/ BUFFER MOBILE WITH THREE DIMMS QS5813 FEA

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SKEW CLOCK DRIVER/ BUFFER MOBILE WITH THREE DIMMS QS5813 FEA

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QS5813 SKEW CLOCK DRIVER/BUFFER MOBILE
SKEW CLOCK DRIVER/ BUFFER MOBILE WITH THREE DIMMS
QS5813
FEATURES:
output buffer/driver programming capability Power Supply Voltage 3.3V Skew Outputs (<200ps) Multiple noise reduction SSOP package
DESCRIPTION
QS5813 high speed, noise 1-13 non-inverting buffer designed SDRAM clock buffer applications. outputs,12 could used drive three SDRAM DIMMS, remaining output used external feedback stage synchronization master clock. QS5813 also includes interface, which enable disable each output clock when lines used. turning outputs off, will reducing Electro Magnetic Interference (EMI).
FUNCTIONAL BLOCK DIAGRAM
SDATA ODING BUF_IN
SCLK
1999 Integrated Device Technology, Inc.
APRIL 2000
DSC-5475/-
QS5813 SKEW CLOCK DRIVER/BUFFER MOBILE
CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Symbol Description Supply Voltage Ground Output Voltage VOUT Output Voltage Input Diode Current with Maximum Power Dissipation 85°C TSTG Storage Temperature Max.
Unit
SDRAM SDRAM SDRAM SDRAM BUF_IN SDRAM SDRAM SDRAM SDATA
SO28-7
SDRAM SDRAM SDRAM SDRAM8 SDRAM SDRAM GNDI2 SCLK
NOTE: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS cause permanent damage device. This stress rating only functional operation device these other conditions above those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect reliability.
SSOP VIEW
DESCRIPTION
Name SDRAM (0:5) SDRAM (6:11) SDRAM (12) BUF_IN SDATA SCLK GNDI2C VDDI2C Description SDRAM Byte Clock Outputs. SDRAM Byte Clock Outputs. SDRAM Byte Clock Outputs. Input Buffers. Data Input. 100k internal pull VDD. Data Input. 100k internal pull VDD. 3.3V power supply output buffers. Ground output buffers. Ground circuitry. 3.3V Power Supply circuitry.
QS5813 SKEW CLOCK DRIVER/BUFFER MOBILE
ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Operating Condition: 40°C +85°C
Symbol Parameter Input HIGH Voltage Level Input Voltage Level Input High Current Input Current Test Conditions Inputs inputs except inputs Inputs with 100k pull 0pF; fIN@66.66MHz(1) 30pF; Supply Current fIN@66.66MHz(1) 0pF; fIN@100MHz(1) 30pF; fIN@100MHz(1) BUF_IN VDD, other inputs VOLI2C Output High Voltage Output Voltage Output Voltage -36mA 25mA SDATA IOLI2C Min. Typ.(1) Max. Unit
NOTE: Typical values 3.3V, +25°C ambient.
ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol
Parameter Rise Time Fall Time Duty Cycle Skew (output-output) Propagation Delay
Test Conditions 0.4V 2.4V; 30pF 2.4V 0.4V; 30pF 1.5V; 30pF 1.5V; 30pF outputs 1.5V
Min.
Typ.
Max.
Unit
tPHL tPLH
OPERATING CHARACTERISTICS 25oC
Symbol Parameter Power Supply Voltage Operating Temperature Load Capacitance Input Capacitance Min. 3.135 Typ. Max. 3.465 Unit
QS5813 SKEW CLOCK DRIVER/BUFFER MOBILE
SERIAL INTERFACE CONTROL
interface permits individual enable/disable each clock output: unused outputs disabled reduce EMI. QS5813 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 QS5813
Address read/write writes reads. During read back, first byte read Byte Count representing number bytes following (fixed
SERIAL CONFIGURATION COMMAND BITMAPS
Byte SDRAM Active/Inactive Register Enable, Disable, outputs held LOW), Default Enable
Description SDRAM (Active/Inactive) SDRAM (Active/Inactive) Initialize Initialize 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) Initialize Initialize SDRAM (Active/Inactive) SDRAM (Active/Inactive)
Byte SDRAM Active/Inactive Register Enable, Disable, outputs held LOW), Default Enable
Description Initialize SDRAM (Active/Inactive) Reserved, power Reserved, power Reserved, power Reserved, power Reserved, power Reserved, power
QS5813 SKEW CLOCK DRIVER/BUFFER MOBILE
TEST CIRCUIT
Pulse Generator
30pF
TIMING DIAGRAM PROPAGATION DELAY
1.5V INPUT 2.4V OUTPUT 0.4V 0.5V
QS5813 SKEW CLOCK DRIVER/BUFFER MOBILE
ORDERING INFORMATION
Device Type Package
Shrink Outline Package (200-mil)
5813
Skew lock Driver/Buffer obile with Three
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SKEW CLOCK DRIVER/ BUFFER MOBILE WITH THREE DIMMS QS5813 FEA

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