BR9010 Datasheet, PDF (1/17 Pages) Rohm – 1, 2, and 4k bit EEPROMs for direct connection to serial ports

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 (SSOP-
B8 is available only with BR9010).
•100,000 ERASE / WRITE cycles
•10 years Data Retention
•Easily connects to serial port
•^{Pin assignments}
CS 1
8 VCC R / B^∗ 1
8 WC
SK 2 _{BR9010 /}
7
BR9020 / 9040
DI 3
6
R / B^∗ VCC 2
WC CS 3
DO 4
5 GND SK 4
BR9010F / 7 GND
BR9010FV /
BR9020F / _{6 DO}
BR9040F
5 DI
∗ This pin is N.C. (non connection) on BR9010.
•^{Pin description}
Pin
name
CS
SK
DI
DO
GND
WC
R /B
VCC
Function
Chip select input
Serial data clock input
Operating code, address, and serial data input
Serial data output
Reference voltage for all I / O, 0V
Write control input
READY, BUSY status signal output
Power supply connection
•^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.
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