SKEW CLOCK DRIVER/ BUFFER MOBILE WITH FOUR SO-DIMMS output buffer

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SKEW CLOCK DRIVER/ BUFFER MOBILE WITH FOUR SO-DIMMS output buffer

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QS5814 SKEW CLOCK DRIVER/BUFFER MOBILE
SKEW CLOCK DRIVER/ BUFFER MOBILE WITH FOUR SO-DIMMS
output buffer/driver Tri-state testing programming capability Power Supply Voltage 3.3V Skew Outputs (<200ps) Multiple noise reduction SSOP package
QS5814
DESCRIPTION
QS5814 high speed, noise non-inverting buffer designed SDRAM clock buffer applications. outputs, could used drive four SDRAM SO-DIMMS, remaining used external feedback stage synchronization master clock. QS5814 also includes interface, which enable disable each output clock when lines used. turning outputs off, will reducing Electro Magnetic Interference (EMI).
FUNCTIONAL BLOCK DIAGRAM
SDRAM SDRAM SDRAM SDATA DECODING PORT SDRAM SDRAM SDRAM SDRAM BUF_IN SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM
SCLK
1999 Integrated Device Technology, Inc.
APRIL 2000
DSC-5476/-
QS5814 SKEW CLOCK DRIVER/BUFFER MOBILE
CONFIGURATION
SDRAM SDRAM SDRAM SDRAM BUF_IN SDRAM SDRAM SDRAM SDATA SO28-7 SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM SDRAM GNDI2 SCLK
ABSOLUTE MAXIMUM RATINGS(1)
Symbol TSTG Description Supply Voltage Ground Output Voltage Output Voltage Input Diode Current Maximum Power Dissipation 85°C Storage Temperature Max. 4.6V 4.6V Unit
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 (12:13) BUF_IN SDATA SCLK GNDI2C VDDI2C Description SDRAM Byte Clock Outputs. SDRAM Byte Clock Outputs. SDRAM Byte Clock Outputs. Input Buffers. Tri-State Output Enable. When asserted LOW, clock outputs high impedance. 100k internal pull VDD. 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.
QS5814 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 (SDATA SCLK) Inputs with 100k pull 0pF; Supply Current 0pF; fIN@66.66MHz(1) fIN@100MHz(1) fIN@100MHz(1) 30pF; fIN@66.66MHz(1) 30pF; VOLI2C Output High Voltage Output Voltage Output Voltage Min. Typ.(1) Max. Unit
BUF_IN -36mA 25mA SDATA IOLI2C
NOTE: Typical values 3.3V, +25°C ambient.
ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol
Parameter Rise Time(1) Fall Time(1) Duty Cycle(1) Skew (output-to-output)(1) Propagation Delay Enable Delay Disable Delay
Test Conditions 0.4V 2.4V; 30pF 2.4V 0.4V; 30pF 1.5V; 30pF 1.5V; 30pF outputs 1.5V 1.5V 1.5V
Min.
Typ.(1)
Max.
Unit
TPHL TPLH TPROP TPROP
NOTE: Guaranteed design, subject 100% production testing.
OPERATING CHARACTERISTICS 25oC
Symbol Parameter Power Supply Voltage Operating Temperature Load Capacitance Input Capacitance(1) Min. 3.135 Typ. Max. 3.465 Unit
QS5814 SKEW CLOCK DRIVER/BUFFER MOBILE
SERIAL INTERFACE CONTROL
interface permits individual enable/disable each clock output: unused outputs disabled reduce EMI. QS5814 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 QS5814
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), 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), 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), Default Enable
Description SDRAM (Active/Inactive) SDRAM (Active/Inactive) Reserved, power Reserved, power Reserved, power Reserved, power Reserved, power Reserved, power
QS5814 SKEW CLOCK DRIVER/BUFFER MOBILE
TEST CIRCUIT
Pulse Generator
aram eter Tested itch osition
tPLZ, tPZL Others
Closed Open
30pF
TIMING DIAGRAM ENABLE DISABLE TIMES
ENABLE CONTROL INPUT tPZL OUTPUT NORMALLY tPZH OUTPUT NORMALLY HIGH 0.5Vcc 0.5Vcc tPHZ 0.3V tPLZ DISABLE 1.5V 0.3V
PROPAGATION DELAY
1.5V INPUT tPHL 2.4V 0.5V 0.4V
OUTPUT
QS5814 SKEW CLOCK DRIVER/BUFFER MOBILE
ORDERING INFORMATION
Device Type Package
Shrink Outline Package (S028-7)
5814
Skew Clock Driver
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SKEW CLOCK DRIVER/ BUFFER MOBILE WITH FOUR SO-DIMMS output buffer

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