Memory ICs 1, 2, and 4k bit EEPROMs for direct connection to serial ports BR9010 / BR9010F / BR9010FV / BR9020 / BR9020F / BR9040 / BR9040F Features Pin assignments BR9010 / F / FV (1k bit): 64 words 16 bits * CS 1 8 VCC R / B 1 8 WC BR9020 / F (2k bit): 128 words 16 bits BR9040 / F (4k bit): 256 words 16 bits * SK R / B VCC BR9010F / GND 2 7 2 7 BR9010 / BR9010FV / Single power supply operation BR9020 / 9040 BR9020F / DI 3 6 WC CS 3 6 DO Serial data input and output BR9040F Automatic erase-before-write DO 4 5 GND SK 4 5 DI Low current consumption * This pin is N.C. (non connection) on BR9010. 1.5mA (max.) active current: 3V 2m A (max.) standby current: 3V Pin description Noise filter built into SK pin Compact DIP8, SOP8, SSOP-B8 packages (SSOP- Pin Function name B8 is available only with BR9010). 100,000 ERASE / WRITE cycles CS Chip select input 10 years Data Retention SK Serial data clock input Easily connects to serial port Operating code, address, and serial data input DI Serial data output DO Reference voltage for all I / O, 0V GND Write control input WC READY, BUSY status signal output R / B Power supply connection VCC Overview The BR90 series are serial EEPROMs that can be connected directly to a serial port and can be erased and written electrically. Writing and reading is performed in word units, using four types of operation commands. Communication occurs through CS, SK, DI, and DO pins, WC pin control is used to initiate a write disabled state, enabling these EEPROMs to be used as one-time ROMs. During writing, operation is checked via the internal status check. 1BR9010 / BR9010F / BR9010FV / BR9020 / BR9020F / BR9040 / BR9040F Memory ICs Block diagram BR9010 / F / FV Command decode Power supply CS voltage detector Control Clock generation Write High voltage SK disable generator WC Command DI register Address Address 6bit buffer decoder 1024bit 6bit EEPROM R / W array Data 16bit register amplifier 16bit DO BR9020 / F, BR9040 / F R / B Command decode CS Power supply voltage detector Control Clock generation SK Write High voltage disable generator WC Command DI register Address Address 7 (8) 2,048 buffer decoder 7 (8) 4,096 bit bit ( ) bit EEPROM Data R / W 16bit array amplifier register 16bit DO Values in parentheses are for the BR9040 / F. * 2