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RAM 8 Memory Products Typical Applications ■ Metering ■ Point-Of-Sale (POS) terminals ■ Printers ■ Internet radio ■ Ethernet ■ Wi-Fi ■ Replace parallel RAM ■ Any application needing low-cost RAM Flexible RAM Expansion Add features to your current microcontroller and get to market faster. ■ Add functionality to your current design ■ No need to buy a larger microcontroller just for the RAM ■ Familiar 4-pin SPI interface ■ Reduce cost in your current design ■ Scratchpad, buffering, high-endurance applications Serial SRAM Microchip’s Serial SRAM family provides a way to easily and inexpensively add external RAM to almost any application. These serial devices use less power and fewer I/O connections than traditional parallel SRAM, and they allow you to use a smaller microcontroller with additional on-board RAM. Microchip’s SPI-compatible Serial SRAM devices are available in 64 Kbit, 256 Kbit, 512 Kbit and 1 Mbit options and up to 20 MHz. The 512 Kbit and 1 Mbit parts support data backup via an external battery/coin cell connected VBAT pin. These 8-pin devices have unlimited endurance and zero write times. 1.5–1.95 V 2.7–3.6 V 1 Mb 23A1024/20 MHz 23LC1024/20 MHz 512 Kb 23A512/20 MHz 23LC512/20 MHz 256 Kb 23A256/16 MHz 23K256/20 MHz 64 Kb 23A640/16 MHz 23K640/20 MHz Key Features ■ SPI Bus, 20 MHz ■ Volatile memory ■ Operating voltage: 1.5–1.95 V, 2.7–3.6 V ■ Infi nite endurance ■ Zero write speeds ■ Low power consumption Key Benefi ts ■ Lower system costs – innovative products, tiny packages, low-power consumption, fewer I/O pins, small form factor ■ Save I/O pins on the MCU – more compact designs, add additional features ■ Secure data with write-protect options ■ Robust designs with broad operating conditions The Serial SRAM Advantage RAM Feature Traditional Parallel SRAM Microchip’s Serial SRAM I/O Connection to MCU 16–20 4 Standby Current 3 mA 1 μA Active Current 50 mA 1–10 mA lowest Operating Voltage 3.0 V 1.7 V Footprint 100 mm2 20 mm2 Smallest Packages 28-pin TSSOP, 28-pin SOIC 8-pin TSSOP, 8-pin SOIC MCU MCU Parallel SRAM RAM Parallel . . . 16–20 I/O lines MCU Serial SRAM RAM SPI 4 I/O lines Stand-alone Serial SRAM offering greater design flexibility and the opportunity for RAM expansion RAM MCU MCU Parallel SRAM RAM Parallel . . . 16–20 I/O lines MCU Serial SRAM RAM SPI 4 I/O lines Stand-alone Serial SRAM offering greater design flexibility and the opportunity for RAM expansion MCU MCU Parallel SRAM RAM Parallel . . . 16–20 I/O lines MCU Serial SRAM RAM SPI 4 I/O lines Stand-alone Serial SRAM offering greater design flexibility and the opportunity for RAM expansion Serial SRAM Products Device Density (Organization) Max. Clock Frequency Operating Voltage (A, K) Temperature (I, E) (°C) Read Current (mA) Max. Standby Current Packages Battery Back-Up 23X640 8 KB (64 Kbits) 20 MHz 1.8 V, 3 V −40 to 125 3 mA 4 μA PDIP, SOIC, TSSOP No 23X256 32 KB (256 Kbits) 20 MHz 1.8 V, 3 V −40 to 125 3 mA 4 μA PDIP, SOIC, TSSOP No 23X512 64 KB (512 Kbits) 20 MHz 1.8 V, 3 V, 5 V −40 to 125 3 mA 4 μA PDIP, SOIC, TSSOP Yes 23X1024 125 KB (1 Mbit) 20 MHz 1.8 V, 3 V, 5 V −40 to 125 3 mA 4 μA PDIP, SOIC, TSSOP Yes 1. Voltage Range: A = 1.5–1.95 V, K = 2.7–3.6 V 2. All devices are RoHS-compliant


EETE MAR 2015
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