External SRAM

The STK501 contains a footprint where an external SRAM device can be mounted. Make sure the SRAM device has the same voltage range as the rest of the design.

CAUTION:

Special care should be taken if a low voltage SRAM is used, since High-voltage Programming requires a programming voltage higher than 4.5V. Low-voltage SRAM may be damaged if High-voltage Programming of the target AVR is done.

Table 1 shows a list of recommended SRAM devices, and typical range of operation. It is important that the SRAM device is soldered with the correct orientation as shown in Figure 1.

Note:

The SRAM is disabled by default. To enable SRAM support, put a jumper between the SRAMEN and GND pin on the PORTG/AUX connector.

Figure 1. PIN1 on SRAM Footprint and Pinout

Table 1. Recommended SRAM Devices
Manufacturer Part number Vcc Package
ISSI IS63LV1024-T 3.3V TSOP-II
IS63LV1024-J 3.3V SOJ 300-mil
IS63LV1024-K 3.3V SOJ 400-mil
IDT IDR71124-Y 5V SOJ 400-mil
IDT71V124SA-TY 3.3V SOJ 300-mil
IDT71V124SA-Y 3.3V SOJ 400-mil
IDT71V124SA-PH 3.3V TSOP-II