Winbond W634GU6RB-11

Winbond W631GU6NB-11 is a 1.5V, 512Mbit low-power double data rate 3L synchronous dynamic random access memory (DDR3L SDRAM) device. The device is internally configured as 8 banks with 16-bit I/O, organized as 32M × 8 banks × 16 bits. It employs a double data rate architecture for high-speed operation. This double data rate architecture is essentially an 8n-prefetch architecture, with an interface designed to transfer two data words per clock cycle at the I/O pins. For DDR3L SDRAM, a single read or write access consists of an 8n-bit wide, one-clock-cycle data transfer at the internal DRAM core, and eight corresponding n-bit wide, half-clock-cycle data transfers at the I/O pins. The device is designed to comply with key DDR3L DRAM features such as posted CAS# with additive latency, write latency equal to read latency minus 1, on-die termination (ODT), and dynamic ODT for write operations. All control and address inputs are synchronous to a pair of externally supplied differential clocks. Inputs are latched at the crossing point of the differential clock (rising edge of CK and falling edge of CK#). All I/O are synchronous to a pair of bidirectional differential data strobes (DQS, DQS#), which are edge-aligned with data during reads and center-aligned with data during writes. The device supports the following features: programmable CAS latency, programmable additive latency, programmable burst length (BL8, BC4, and BC4 via mode register set (MRS)), and programmable partial array self-refresh (PASR).

• Supply voltage VDD = VDDQ = 1.5V ±0.075V
• 8n-bit prefetch architecture
• Differential clock inputs (CK, CK#)
• Differential data strobe (DQS, DQS#)
• Data strobe (DQS, DQS#) edge-aligned with data during reads, center-aligned during writes
• Data Mask (DM) masks data during writes
• All address and control inputs latched at the crossing of CK and CK#
• Programmable CAS Latency: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
• Programmable Additive Latency: 0, CL-1, CL-2
• Programmable Burst Length: 8, 4 (via BC4 or BL8 mode)
• Programmable Partial Array Self-Refresh (PASR)
• Auto Self-Refresh (ASR) and Self-Refresh Temperature (SRT)
• Dynamic ODT (Rtt_WR) support
• Programmable output driver impedance (RZQ/7, RZQ/6, RZQ/5)
• Programmable ODT impedance (RZQ/6, RZQ/7, RZQ/4, RZQ/2, disabled)
• Programmable Write Recovery (WR)
• Programmable CWL: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
• Programmable DLL reset
• Programmable DLL enable/disable
• Programmable output disable
• Programmable Multi-Purpose Register (MPR)
• Programmable test mode
• Programmable precharge powerdown DLL
• Programmable write leveling
• Programmable ZQ calibration
• Programmable reset
• Programmable initialization
• Programmable mode register
• Programmable command truth table
• Programmable CKE truth table
• Programmable simplified state diagram
• Programmable electrical characteristics
• Programmable maximum ratings
• Programmable operating temperature conditions
• Programmable DC and AC operating conditions
• Programmable recommended DC operating conditions
• Programmable input and output leakage current
• Programmable interface test conditions
• Programmable DC and AC input measurement levels
• Programmable DC and AC input levels (single-ended command and address signals)
• Programmable DC and AC input levels (single-ended data signals)
• Programmable differential swing requirements (clock (CK - CK#) and strobe (DQS - DQS#))
• Programmable single-ended requirements for differential signals
• Programmable differential input crosspoint voltage
• Programmable slew rate definition for single-ended input signals
• Programmable slew rate definition for differential input signals
• Programmable DC and AC output measurement levels
• Programmable output slew rate definitions and requirements
• Programmable single-ended output slew rate
• Programmable differential output slew rate
• Programmable output driver DC electrical characteristics
• Programmable output driver temperature and voltage sensitivity
• Programmable ODT levels and characteristics
• Programmable ODT levels and I-V characteristics
• Programmable ODT DC electrical characteristics
• Programmable ODT temperature and voltage sensitivity
• Programmable RTTPU and RTTPD design guidelines
• Programmable ODT timing definitions