255 PBGA iNTEGRATED PLASTIC ENCAPSULATED MICROCIRCUIT 4.8Gb, 4.1 Gb, 2.4Gb & 2.1Gb SDRAM-DDR2 255 PBGA FEATURES • • • • • • • • • • • • • • • DDR2 Data rate = 667, 533, 400 MHz Available in Industrial, Enhanced and Military Temp Package: 255 PBGA, 25 x 32mm2, 1.27mm pitch Differential data strobe (DQS, DQS#) Internal, pipelined, DDR architecture 4-bit prefetch architecture DLL for alignment of DQ and DQS transitions Programmable Burst lengths: 4 or 8 Auto Refresh and Self Refresh Modes On Die Termination (ODT) Adjustable output drive strength 1.8V ±0.1V power supply and I/O (VCC/VCCQ) Programmable CAS latency: 3, 4, 5, or 6 Posted CAS additive latency: 0, 1, 2, 3 or 4 Weight: ~ 3.5 grams typical BENEFITS: • Reduction of interconnects • Defined for easy SMT manufacturability (1.27mm ball pitch) • Integrated package with full power & ground planes for improved high frequency signal • Improved parasitics • Excellent thermal properties • 47% I/O reduction vs individual CSP approach • Reduced trace lengths for lower parasitic capacitance • Suitable for hi-reliability applications • 100% tested / processed to: Industrial [IT] -40oC to +85oC Enhanced [ET] -40oC to +105oC Military [XT] -55oC to +125oC NOTE: Self Refresh Mode available on Industrial and Enhanced temp. only OPTIONS APPLICATIONS Examples Include: • Compact digital computing ~Digital radio ~Handheld GPS ~Secure communications systems • Missile guidance & navigation • Smart munitions • Portable manpack designs where weight & size is critical AS4DDR264M72PBG 4.8Gb, SDRAM-DDR2, 64M x 72 25mm x 32mm - 255 PBGA AS4DDR264M64PBG 4.1Gb, SDRAM-DDR2, 64M x 64 25mm x 32mm - 255 PBGA AS4DDR232M72PBG 2.4Gb, SDRAM-DDR2, 32M x 72 25mm x 32mm - 255 PBGA AS4DDR232M64PBG 2.1Gb, SDRAM-DDR2, 32M x 64 25mm x 32mm - 255 PBGA w w w.m icross.com MECHANICAL DEFINITIONS 1 2 3 4 6 7 5 8 9 10 11 12 13 14 15 16 T R P N M L K J 19.05 NOM 24.90 25.10 H G F E D 1.27 NOM C B A (Bottom View) 255 x 0.762 NOM 1.27 NOM 31.90 32.10 0.61 NOM 2.03 MAX SYSTEM BLOCK DIAGRAM BLOCK DIAGRAM Ax, BA0-1 ODT VRef VCC VCCQ VSS VSSQ VCCL VSSDL VCCL VCCL VSSDL VSSDL VSSDL A 2 CS0\ CS1\ CS2\ CS3\ VCCL 2 2 2 C 2 2 3 3 2 3 3 3 2 2 3 3 A DQ0-15 B DQ16-31 C DQ32-47 D Phone: 512.339.1188 [email protected] www.micross.com Rev 3.1 08/11 DQ64-79 2 2 3 3 VSSDL D 2 2 2 3 CS4\ UDMx, LDMx UDSQx,UDSQx\ LDSQx, LDSQx\ RASx\,CASx\,WEx\ CKx,CKx\,CKEx B 2 VCCL DQ48-63 For more information or to view a complete datasheet, please visit our website at www.micross.com or call (512) 339-1188.