Features: • Organization- 1,048,576 words × 8 bits × 2 banks (2M × 8) 11 row, 9 column address- 524,288 words × 16 bits × 2 banks (1M × 16) 11 row, 8 column address• All signals referenced to positive edge of clock, fully synchronous• Dual internal banks controlled by A11 (bank s...
AS4LC1M16S0: Features: • Organization- 1,048,576 words × 8 bits × 2 banks (2M × 8) 11 row, 9 column address- 524,288 words × 16 bits × 2 banks (1M × 16) 11 row, 8 column address• All signals referenc...
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Features: • Organization: 1,048,576 words × 16 bits• High speed - 50/60 ns RAS access ...
Features: • Organization- 1,048,576 words × 8 bits × 2 banks (2M × 8) 11 row, 9 column addre...
Parameter |
Symbol |
Min |
Max |
Unit |
Notes |
Input voltage Power supply voltage Storage temperature (plastic) Power dissipation Short circuit output current |
V IN,V OUT V CC,V CCQ T STG P D IOUT |
1.0 1.0 55 |
+4.6 +4.6 +150 1 50 |
V V °C W mA |
Note: Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions outside those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
The AS4LC2M8S1, AS4LC2M8S0, and AS4LC1M16S1, AS4LC1M16S0 are high-performance 16-megabit CMOS Synchronous Dynamic Random Access Memory (SDRAM) devices organized as 1,048,576 words × 8 bits × 2 banks (2048 rows × 512 columns) and 524,288 words × 16 bits × 2 banks (2048 rows × 256 columns), respectively. Very high bandwidth is achieved using a pipelined architecture where all inputs and outputs are referenced to the rising edge of a common clock. Programmable burst mode can be used to read up to a full page of data (512 bytes for 2M × 8 and 256 bytes for 1M × 16) without selecting a new column address.
The operational advantages of an SDRAM AS4LC1M16S0 are as follows: (1) the ability to synchronously output data at a high clock frequency with automatic increments of column-address (burst access); (2) bank-interleaving, which hides precharge time and attains seamless operation; and (3) the capability to change column-address randomly on every clock cycle during burst access.
This SDRAM product also features of AS4LC1M16S0 a programmable mode register, allowing users to select read latency as well as burst length and type (sequential or interleaved). Lower latency improves first data access in terms of CLK cycles, while higher latency improves maximum frequency of operation. This feature enables flexible performance optimization for a variety of applications.
SDRAM commands and functions of AS4LC1M16S0 are decoded from control inputs. Basic commands are as follows:
• Mode register set • Deactivate bank • Deactivate all banks • Select row; activate bank
• Select column; write • Select column; read • Deselect; power down • CBR refresh
• Auto precharge with read/write • Self-refresh
Both devices are available in 400-mil plastic TSOP type 2 package. The AS4LC2M8S1/ AS4LC2M8S0 have 44 pins, and the AS4LC1M16S1/ AS4LC1M16S0 have 50 pins. All devices operate with a power supply of 3.3V ± 0.3V. Multiple power and ground pins are provided for low switching noise and EMI. Inputs and outputs are LVTTL compatible.