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W40S11-23
Clock Buffer/Driver
Features
* Thirteen skew-controlled CMOS clock outputs (SDRAM0:12) * Supports three SDRAM DIMMs * Ideal for high-performance systems designed around Intel's latest chip set * I2C serial configuration interface * Clock Skew between any two outputs is less than 250 ps * 1- to 5-ns propagation delay * DC to 133-MHz operation * Single 3.3V supply voltage * Low power CMOS design packaged in a 28-pin, 300-mil SOIC (Small Outline Integrated Circuit)
Key Specifications
Supply Voltages:........................................... VDD = 3.3V5% Operating Temperature:.................................... 0C to +70C Input Threshold: .................................................. 1.5V typical Maximum Input Voltage: .......................................VDD + 0.5V Input Frequency:............................................... 0 to 133 MHz BUF_IN to SDRAM0:12 Propagation Delay: ...... 1.0 to 5.0 ns Output Edge Rate:.............................................. >1.5 V/ns Output Clock Skew: .................................................. 250 ps Output Duty Cycle: .................................. 45/55% worst case Output Impedance: ...............................................15 typical Output Type: ................................................ CMOS rail-to-rail
Overview
The Cypress W40S11-23 is a low-voltage, thirteen-output clock buffer. Output buffer impedance is approximately 15, which is ideal for driving SDRAM DIMMs.
Block Diagram
Pin Configuration
SDATA SCLOCK
Serial Port
Device Control SDRAM0 SDRAM1 SDRAM2 SDRAM3 SDRAM4 SDRAM5 SDRAM6 SDRAM7 SDRAM8
SOIC VDD SDRAM0 SDRAM1 GND VDD SDRAM2 SDRAM3 GND BUF_IN SDRAM4 SDRAM5 SDRAM12 VDD SDATA[1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD SDRAM11 SDRAM10 GND VDD SDRAM9 SDRAM8 GND VDD SDRAM7 SDRAM6 GND GND [1] SCLOCK
BUF_IN
SDRAM9 SDRAM10 SDRAM11 SDRAM12 Note: 1. Internal pull-up resistor of 250K on SDATA and SCLOCK inputs (not CMOS level).
Cypress Semiconductor Corporation
*
3901 North First Street
*
San Jose
*
CA 95134 * 408-943-2600 September 28, 1999 rev. **
W40S11-23
Pin Definitions
Pin Name SDRAM0:12 Pin No. 2, 3, 6, 7, 10, 11, 18, 19, 22, 23, 26, 27, 12 9 14 15 1, 5, 13, 20, 24, 28 4, 8, 16, 17, 21, 25 Pin Type O Pin Description SDRAM Outputs: Provides buffered copy of BUF_IN. The propagation delay from a rising input edge to a rising output edge is 1 to 5 ns. All outputs are skew controlled to within 250 ps of each other. Clock Input: This clock input has an input threshold voltage of 1.5V (typ). I2C Data input: Data should be presented to this input as described in the I2C section of this data sheet. Internal 250-k pull-up resistor. I2C clock input: The I2C data clock should be presented to this input as described in the I2C section of this data sheet. Internal 250-k pull-up resistor. Power Connection: Power supply for core logic and output buffers. Connected to 3.3V supply. Ground Connection: Connect all ground pins to the common system ground plane.
BUF_IN SDATA SCLOCK VDD GND
I I/O I P G
Functional Description
Output Drivers The W40S11-23 output buffers are CMOS type which deliver a rail-to-rail (GND to VDD) output voltage swing into a nominal Table 1. Byte Writing Sequence Byte Sequence 1 Byte Name Slave Address Bit Sequence 11010010
capacitive load. Thus, output signaling is both TTL and CMOS level compatible. Nominal output buffer impedance is 15. Operation Data is written to the W40S11-23 in ten bytes of eight bits each. Bytes are written in the order shown in Table 1.
Byte Description Commands the W40S11-23 to accept the bits in Data Bytes 0-6 for internal register configuration. Since other devices may exist on the same common serial data bus, it is necessary to have a specific slave address for each potential receiver. The slave receiver address for the W40S11-23 is 11010010. Register setting will not be made if the Slave Address is not correct (or is for an alternate slave receiver). Unused by the W40S11-23, therefore bit values are ignored (don't care). This byte must be included in the data write sequence to maintain proper byte allocation. The Command Code Byte is part of the standard serial communication protocol and may be used when writing to another addressed slave receiver on the serial data bus. Unused by the W40S11-23, therefore bit values are ignored (don't care). This byte must be included in the data write sequence to maintain proper byte allocation. The Byte Count Byte is part of the standard serial communication protocol and may be used when writing to another addressed slave receiver on the serial data bus. The data bits in these bytes set internal W40S11-23 registers that control device operation. The data bits are only accepted when the Address Byte bit sequence is 11010010, as noted above. For description of bit control functions, refer to Table 2, Data Byte Serial Configuration Map. Refer to Cypress Frequency Timing Generators.
2
Command Code
Don't Care
3
Byte Count
Don't Care
4 5 6 7 8 9 10
Data Byte 0 Data Byte 1 Data Byte 2 Data Byte 3 Data Byte 4 Data Byte 5 Data Byte 6
Refer to Table 2
Don't Care
2
W40S11-23
Writing Data Bytes Each bit in the data bytes control a particular device function. Bits are written MSB (most significant bit) first, which is bit 7. Table 2. Data Bytes 0-2 Serial Configuration Map[2] Affected Pin Bit(s) 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 Pin No. 11 10 N/A N/A 7 6 3 2 27 26 23 22 N/A N/A 19 18 N/A 12 N/A N/A N/A N/A N/A N/A Pin Name SDRAM5 SDRAM4 Reserved Reserved SDRAM3 SDRAM2 SDRAM1 SDRAM0 SDRAM11 SDRAM10 SDRAM9 SDRAM8 Reserved Reserved SDRAM7 SDRAM6 Reserved SDRAM12 Reserved Reserved Reserved Reserved Reserved Reserved Control Function Clock Output Disable Clock Output Disable (Reserved) (Reserved) Clock Output Disable Clock Output Disable Clock Output Disable Clock Output Disable Clock Output Disable Clock Output Disable Clock Output Disable Clock Output Disable (Reserved) (Reserved) Clock Output Disable Clock Output Disable (Reserved) Clock Output Disable (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) 0 Low Low Low Low Low Low Low Low Low Low Low Low Low ------Data Byte 0 SDRAM Active/Inactive Register (1=Enable, 0=Disable) Active Active Active Active Active Active Active Active Active Active Active Active Active ------Bit Control 1 Table 2 gives the bit formats for registers located in Data Bytes 0-6.
Data Byte 1 SDRAM Active/Inactive Register (1=Enable, 0=Disable)
Data Byte 2 SDRAM Active/Inactive Register (1=Enable, 0=Disable)
Note: 2. At power-up all SDRAM outputs are enabled and active. Program Reserved bits to a "0."
3
W40S11-23
How To Use the Serial Data Interface
Electrical Requirements Figure 1 illustrates electrical characteristics for the serial interface bus used with the W40S11-23. Devices send data over the bus with an open drain logic output that can (a) pull the bus line LOW, or (b) let the bus default to logic 1. The pull-up resistor on the bus (both clock and data lines) establish a default logic 1. All bus devices generally have logic inputs to receive data. Although the W40S11-23 is a receive-only device (no data write-back capability), it does transmit an "acknowledge" data pulse after each byte is received. Thus, the SDATA line can both transmit and receive data. The pull-up resistor should be sized to meet the rise and fall times specified in AC parameters, taking into consideration total bus line capacitance.
VDD
VDD
~ 2k SERIAL BUS DATA LINE SERIAL BUS CLOCK LINE
~ 2k
SDCLK CLOCK IN CLOCK OUT N DATA IN DATA OUT
SDATA CLOCK IN N
SCLOCK DATA IN DATA OUT
SDATA
N
CHIP SET (SERIAL BUS MASTER TRANSMITTER)
CLOCK DEVICE (SERIAL BUS SLAVE RECEIVER)
Figure 1. Serial Interface Bus Electrical Characteristics
4
W40S11-23
Signaling Requirements As shown in Figure 2, valid data bits are defined as stable logic 0 or 1 condition on the data line during a clock HIGH (logic 1) pulse. A transitioning data line during a clock HIGH pulse may be interpreted as a start or stop pulse (it will be interpreted as a start or stop pulse if the start/stop timing parameters are met). A write sequence is initiated by a "start bit" as shown in Figure 3. A "stop bit" signifies that a transmission has ended. As stated previously, the W40S11-23 sends an "acknowledge" pulse after receiving eight data bits in each byte as shown in Figure 4.
SDATA
SCLOCK
Valid Data Bit
Change of Data Allowed
Figure 2. Serial Data Bus Valid Data Bit
SDATA
SCLOCK Start Bit Stop Bit
Figure 3. Serial Data Bus Start and Stop Bit
5
Figure 4. Serial Data Bus Write Sequence
Signaling from System Core Logic Start Condition Slave Address (First Byte)
SDATA MSB 1 1 0 1 0 0 1 LSB 0 MSB
Stop Condition Command Code (Second Byte)
LSB
Byte Count (Third Byte)
MSB MSB
Last Data Byte (Last Byte)
LSB
SCLOCK
1
2
3
4
5
6
7
8
A
1
2
3
4
5
6
7
8
A
1
2
3
4
1
2
3
4
5
6
7
8
A
SDATA
Signaling by Clock Device
Acknowledgment Bit from Clock Device
6 Figure 5. Serial Data Bus Timing Diagram
SDATA tSPF tLOW SCLOCK tSTHD tR tHIGH tF tDSU tDHD tSP tSPSU tSTHD t SPSU
W40S11-23
W40S11-23
Absolute Maximum Ratings
Stresses greater than those listed in this table may cause permanent damage to the device. These represent a stress rating only. Operation of the device at these or any other conditions Parameter VDD, VIN TSTG TA TB Description Voltage on any pin with respect to GND Storage Temperature Operating Temperature Ambient Temperature under Bias above those specified in the operating sections of this specification is not implied. Maximum conditions for extended periods may affect reliability Rating -0.5 to +7.0 -65 to +150 0 to +70 -55 to +125 Unit V C C C
DC Electrical Characteristics: TA = 0C to +70C, VDD = 3.3V5%
Parameter IDD Logic Inputs VIL VIH IILEAK IILEAK VOL VOH IOL IOH CIN COUT LIN Input Low Voltage Input High Voltage Input Leakage Current, BUF_IN Input Leakage Current[3] Output Low Voltage Output High Voltage Output Low Current Output High Current Input Pin Capacitance Output Pin Capacitance Input Pin Inductance IOL = 1 mA IOH = -1 mA VOL = 1.5V VOH = 1.5V 3.1 65 70 100 110 160 185 5 6 7 GND-0.3 2.0 -5 -20 0.8 VDD+0.5 +5 +5 50 V V A A mV V mA mA pF pF nH Description 3.3V Supply Current Test Condition/Comments BUF_IN = 100 MHz Min Typ Max 250 Unit mA
Logic Outputs (SDRAM0:12)
Pin Capacitance/Inductance
Note: 3. SDATA and SCLOCK logic pins have 250-k internal pull-up resistors.
7
W40S11-23
AC Electrical Characteristics: TA = 0C to +70C, VDD = 3.3V5% (Lump Capacitance Test Load = 30 pF)
Parameter fIN tR tF tSR tSF tEN tDIS tPR tPF tD Zo tPR Description Input Frequency Output Rise Edge Rate Output Fall Edge Rate Output Skew, Rising Edges Output Skew, Falling Edges Output Enable Time Output Disable Time Rising Edge Propagation Delay Falling Edge Propagation Delay Duty Cycle AC Output Impedance Rising Edge Propagation Delay 1.0 Measured at 1.5V 1.0 1.0 1.0 1.0 45 15 5.0 Measured from 0.4V to 2.4V Measured from 2.4V to 0.4V Test Condition Min 0 1.5 1.5 Typ Max 133 4.0 4.0 250 250 8.0 8.0 5.0 5.0 55 Unit MHz V/ns V/ns ps ps ns ns ns ns % ns
Ordering Information
Ordering Code W40S11 Document #: 38-00793 Freq. Mask Code -23 Package Name G Package Type 28-pin SOIC (300 mils)
8
W40S11-23
Package Diagram
28-Pin Small Outline Integrated Circuit (SOIC, 0.300 inch)
(c) Cypress Semiconductor Corporation, 1999. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.

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