ISSI Serial RAM Devices

ISSI Serial RAM Devices contain 8Mb/16Mb/32Mb pseudo-static Random Access Memory (RAM) using a self-refresh DRAM array. These arrays are organized as 1M words by 8 bits, 2M words by 8 bits, and 4M words by 8 bits for 8Mb, 16Mb, and 32Mb, respectively. The serial RAM devices support Serial Peripheral Interface (SPI) and Quad Peripheral Interface (QPI) protocols and low signal count. These devices also support hidden refresh operation, industrial temperature, and automotive A2 grade temperature. In-band reset is supported instead of a dedicated RESET# pin and the minimum transferred data size is 8bit.

Features

Industry Standard Serial Interface:
- SPI protocol:
  - 1-1-1 and 1-4-4 operation
- QPI protocol:
  - 4-4-4 operation
- Low signal counts:
  - 6 Signal pins (CE#, CLK, and SIO0~SIO3)
High performance:
- Clock rate:
  - 33MHz(max) for normal read
  - 104MHz (max) for fast read
- Page Size:
  - 1024 Byte
- Configurable wrapped burst length:
  - 32 and 1024 (Default=1024)
- Always wrapped burst operation within a page:
- Drive Strength:
  - 50Ω
Low power consumption:
- Single 1.65V to 1.95V voltage supply range
- Single 2.7V to 3.6V voltage supply range
- 15mA maximum active QPI mode read current @ 104MHz, 105°C
- 150µA typical standby current
Hardware features:
- CLK input:
  - Serial clock input
- SIO0 – SIO3:
  - Serial data input or serial data output

Temperature grades:
- Industrial:
  - -40°C to 85°C
- Auto (A1) grade:
  - -40°C to 85°C
- Auto (A2) grade:
  - -40°C to 105°C
Industry-standard package:
K = 8-contact WSON 6mm x 5mm
T = 8-contact USON 4mm x 3mm
N = 8-pin SOIC 150mil
Y = 12-ball WLCSP

ISSI Serial RAM Devices

Features

Block Diagram

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