256B Datasheet(PDF) - MF3ICDQ1 - NXP Semiconductors

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	MF3ICDQ1	112Kb/18P	MIFARE DESFire EV1 256B contactless smartcard IC Rev.3.0-5 November2015
List of Unclassifed Man...	VRS550	868Kb/40P	VRS550 - 8kB Flash, 256B RAM, 25MHz, 8-Bit MCU VRS560 - 16kB Flash, 256B RAM, 25MHz, 8-Bit MCU
IBM	256B	343Kb/21P	256b/257b Transcoding for 100 Gb/s Backplane and Copper Cable
NXP Semiconductors	P80C3XX2	409Kb/62P	low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz)null 128B/256B RAM 2003 Jan 24
	P87C654X2	497Kb/88P	80C51 8-bit microcontroller family 16 kB OTP/ROM, 256B RAM, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) 2004 Apr 20
	P83C654X2	501Kb/88P	80C51 8-bit microcontroller family 16 kB OTP/ROM, 256B RAM, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) 2004 Apr 20
	80C31X2	380Kb/62P	80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz 2003 Jan 24
	P80C31X2	408Kb/62P	80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) 2003 Jan 24

256B Datasheet, PDF