4Gb (32Mx8Banksx16) DDR3 SDRAM

The H2A404G1666J is a high speed Double Date Rate 3 (DDR3) Synchronous DRAM fabricated with ultra high performance CMOS process containing 4G bits which organized as 32Mbits x 8 banks by 16 bits.
This synchronous device achieves high speed double-data-rate transfer rates of up to 1866 Mb/sec/pin (DDR3-1866) for general applications.

The chip is designed to comply with the following key DDR3 SDRAM features:

1. posted CAS with additive latency,
2. write latency = read latency -1,
3. On Die Termination
4. programmable driver strength data,
5. seamless BL4 access.

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 differential data 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 and /CAS multiplexing style.