4Gb (32Mx16Banks×8) DDR4 SDRAM

The 4Gb DDR4 SDRAM is organized as 32Mbit x8 I/Os x 16banks device. This synchronous device achieves high speed double-data-rate transfer rates of up to 2400Mb/sec/ pin (DDR4-2400) for general applications.

The chip is designed to comply with the following key DDR4 SDRAM features such as posted CAS, Programmable CWL, Internal (Self) Calibration, On Die Termination using ODT pin and Asynchronous Reset.

All of the control and address inputs are synchronized with a pair of externally supplied differential clocks. Inputs are latched at the cross point of differential clocks (CK rising and CK falling). All I/Os are synchronized with a pair of bidirectional strobes (DQS and DQS) in a source synchronous fashion. The address bus is used to convey row, column, and bank address information in a RAS/CAS multiplexing style.

The DDR4 device operates with a single 1.2V (1.14V~1.26V) power supply and 1.2V (1.14V~1.26V). The 4Gb DDR4 device is available in 78ball FBGAs.
  • JEDEC standard 1.2V (1.14V~1.26V)
  • VDDQ = 1.2V (1.14V~1.26V)
  • 8-bit pre-fetch
  • 16 internal banks (x8): 4 groups of 4 banks each
  • Programmable CAS Latency (posted CAS): 10, 11, 12, 13, 14, 15, 16, 17, 18
  • Programmable Additive Latency: 0, CL-2 or CL-1 clock
  • Burst Length: 8, 4 with tCCD = 4 which does not allow seamless read or write [either On the fly using A12 or MRS]
  • Bi-directional Differential Data-Strobe
  • Internal (self) calibration: calibration through ZQ pin (RZQ: 240 ohm ± 1%)
  • On Die Termination using ODT pin
  • Average Refresh Period 7.8us at lower than TCASE 85°C, 3.9us at 85°C < TCASE < 95°C
  • Asynchronous Reset
  • CRC for Read/Write data security
  • Command address parity check
  • DBI (Data Bus Inversion)
  • Gear down mode
  • POD (Pseudo Open Drain) interface for data input/ output
  • Internal VREF for data inputs
  • External VPP for DRAM Activating Power
  • All of Lead - Free products are compliant for RoHS
  • All of products are Halogen-free