Memory ICs
1, 2, and 4k bit EEPROMs for direct
connection to serial ports
BR9010 / BR9010F / BR9010FV / BR9020 /
BR9020F / BR9040 / BR9040F
Features
••BR9010 / F / FV (1k bit): 64 words × 16 bits
BR9020 / F (2k bit): 128 words × 16 bits
BR9040 / F (4k bit): 256 words × 16 bits
•Single power supply operation
•Serial data input and output
•Automatic erase-before-write
•Low current consumption
–1.5mA (max.) active current: 3V
–2µA (max.) standby current: 3V
•Noise filter built into SK pin
•Compact DIP8, SOP8, SSOP-B8 packages (SSOPB8 is available only with BR9010).
•100,000 ERASE / WRITE cycles
•10 years Data Retention
•Easily connects to serial port
•Pin assignments
8
VCC R / B∗ 1
7
R / B∗ VCC 2
3
6
WC
CS
3
4
5
GND
SK
4
CS
1
SK
2
DI
DO
BR9010 /
BR9020 / 9040
8
BR9010F /
BR9010FV /
BR9020F /
BR9040F
WC
7
GND
6
DO
5
DI
∗ This pin is N.C. (non connection) on BR9010.
•Pin description
Pin
name
Function
CS
Chip select input
SK
Serial data clock input
DI
Operating code, address, and serial data input
DO
Serial data output
GND
Reference voltage for all I / O, 0V
WC
Write control input
R /B
READY, BUSY status signal output
VCC
Power supply connection
•Overviewseries are serial EEPROMs that can be connected directly to a serial port and can be erased and written
The BR90
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.
1
