DDR110-xxT7RL ® ASD™ IPAD™ Computer DOUBLE DATA RATE TERMINATION NETWORK WITH DISABLE SWITCH MAIN APPLICATION DDR (double data rate) Termination Network used on. ■ Motherboard ■ Workstation ■ Server ■ Notebooks 24 1 12 DESCRIPTION The DDR110 provides 10 bits resistor Network to be used for SDR/DDR (double data rate) SDRAM bus Termination. This device has a series resistors (Rs) to reduce signal reflection noise. This eliminates the need for external terminating resistors. The DDR Termination Nerwork is enabled with the output Enable pin (OE). When OE is HIGH Inputs are connected to Outputs (A connected to B). When OE is LOW every inputs are in High impedance state (Hi - Z). The DDR Termination Network is a bidirectional device when the internal switch is ON. When the switch is OFF, the device will block current in both directions. This device is made using ST IPADTM (Integrated Passive & Active devices) technology. TSSOP24 VCC 24 1 VSS Rs B0 A0 Rs B1 A1 Rs B2 A2 Rs B3 A3 Rs FEATURES AND BENEFITS ■ ■ ■ ■ ■ ■ 10 bits Termination Network. Integrated Termination resistor (Rs) Enable input TTL level compatible Impedance matching ± 2% (A0-B0 / An-Bn) Optimized Low Crosstalk for parallel Termination to Vtt. Optimized Low propagation delay B4 A4 Rs B5 A5 Rs B6 A6 Rs B7 A7 Rs B8 A8 Rs B9 A9 12 OE May 2001 - Ed: 2 GATE CONTROL NC 1/5 DDR110-xxT7RL FUNCTION TABLE OE B0 - B9 Function High A0 - A9 Connect Termination Low Hi - Z Disconnect Termination ABSOLUTE MAXIMUM RATINGS (Tamb = 25°C) Value Symbol Parameter Test Conditions Tambient = 25°C Unit Min. Typ. Max. 5 7 V VCC Supply voltage range - 0.5 VIN Input voltage range DQ0/7, DM0, DQS0 - 0.5 7 V VTT Termination voltage - 0.5 7 V VOE Termination Enable Voltage range - 0.5 7 V 30 mA 2 kV 150 °C IIN Continuous input current VESD ESD ratings (input / output YOE) TSTG Storage temperature HBM MIL STD 883C - 65 RECOMMENDED OPERATING CONDITIONS (Tamb = 25°C) Test Conditions Value Symbol Parameter VIN Input voltage DQ0/7, DM0, DQS0 OE LOW OE HIGH 0 0 VIH Output Enable (OE) HIGH voltage Guaranteed logic HIGH level 2 VIL Output Enable (OE) LOW voltage Guaranteed logic LOW level VCC Supply voltage VTT Termination voltage Min. 4.5 Typ. Max. + 3.3 + 2.5 5 (1) 5 1.25 Unit V V 0.8 V 5.5 V V (1) Open collector output with 10k pull-up resistor to 5V is recommended for typical OE signal. 2/5 ® DDR110-xxT7RL ELECTRICAL CHARACTERISTICS (Tamb = 25°C - Vcc = 5V) Value Symbol Parameter Test conditions RON Switch ON Resistance VTT = 1.25V, VIN = 0V,OE = + 5V DDR110-27 DDR110-56 IOFF INPUT Leakage current Switch OFF INPUT = + 3.3V, OE = 0V COFF OFF-state capacitance VIN = 0V, 1MHz, 30mVRMS, OE = 0V Unit Min. Typ. Max. 22 45 27 56 32 67 Ω Ω 1 µA 6 pF APPLICATION SCHEMATICS 5V Enable VTT DDR 110 OE DDR Data / Strobe SDR 168-pin DIMM slot (North Bridge) SDR 168-pin DIMM slot DDR Control DDR 184-pin DIMM slot DDR Address DDR 184-pin DIMM slot System Controller Chipset 10 bits DDR 110 10 bits DDR 110 10 bits DDR 110 VCC GND DQ7 DQ6 DM0 DQ5 DQ4 DQ3 DQ2 DQS0 DQ1 DQ0 VTT Island Decoupling Capacitor to GND Plane NC OE ENABLE HIGH HIGH ® 3/5 DDR110-xxT7RL PIN ASSIGNEMENT Pin # Assignement for DDR Termination Pin # Assignement for DDR Termination 1 VSS = GND 24 VCC 2 A0 23 B0 3 A1 22 B1 4 A2 21 B2 5 A3 20 B3 6 A4 19 B4 7 A5 18 B5 8 A6 17 B6 9 A7 16 B7 10 A8 15 B8 11 A9 14 B9 12 Termination enable HIGH 13 Not Connected 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 OTHER INFORMATION DDR1 10 - 27 T7 RL Double Data Rate Single switch Tape & Reel 10-BIT Wide Rs value in Ω 27Ω, 56Ω 4/5 Package code T7: TSSOP24 ® DDR110-xxT7RL PACKAGE MECHANICAL DATA TSSOP-24 DIMENSIONS REF. Millimeters Min. A E1 A2 A e b k c A1 L1 13 E 1 Max. Min. Typ. Max. 1.200 0.047 0.150 0.002 0.006 A1 0.050 A2 0.800 1.000 1.050 0.031 0.039 0.041 L D 24 Typ. Inches b 0.190 0.300 0.007 0.012 c 0.090 0.200 0.004 0.008 D 7.700 7.800 7.900 0.303 0.307 0.311 E 12 E1 6.400 4.300 4.400 4.500 0.169 0.173 0.177 e 0.65 k L 0.252 0° 0.026 8° 0° 8° 0.450 0.600 0.750 0.017 0.024 0.029 L1 1.000 0.039 FOOTPRINT 0.65mm 6.8mm 0.30mm 4.4mm 8.00mm ■ Type Marking Package Weight Base qty Delivery mode DDR110-27T7RL DDR110-27 TSSOP-24 0.088 g 2500 Tape & Reel DDR110-56T7RL DDR110-56 TSSOP-24 0.088 g 2500 Tape & Reel Epoxy meets UL94 - V0 standard Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © 2001 STMicroelectronics - Printed in Italy - All rights reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com ® 5/5