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Rohm Semiconductor Electronic Components Datasheet

BR9040F Datasheet

1/ 2/ and 4k bit EEPROMs for direct connection to serial ports

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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 / B1
8 WC
SK 2 BR9010 /
7
BR9020 / 9040
DI 3
6
R / BVCC 2
WC CS 3
DO 4
5 GND SK 4
BR9010F /
BR9010FV /
BR9020F /
BR9040F
7
6
5
GND
DO
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.
1


Rohm Semiconductor Electronic Components Datasheet

BR9040F Datasheet

1/ 2/ and 4k bit EEPROMs for direct connection to serial ports

No Preview Available !

Memory ICs
Block diagram
BR9010 / F / FV
Command decode
CS
Control
SK Clock generation
BR9010 / BR9010F / BR9010FV / BR9020 / BR9020F /
BR9040 / BR9040F
Power supply
voltage detector
Write
disable
High voltage
generator
WC
DI
Command
register
DO
Address
buffer
6bit
Data
register
16bit
Address
decoder
R/W
amplifier
6bit
16bit
1024bit
EEPROM
array
BR9020 / F, BR9040 / F
Command decode
CS
Control
SK Clock generation
Power supply
voltage detector
Write
disable
High voltage
generator
R/B
WC
DI
Command
register
DO
Values in parentheses are for the BR9040 / F.
Address
buffer
Data
register
7 (8)
bit
16bit
Address
decoder
R/W
amplifier
7 (8)
bit
16bit
2,048
(4,096) bit
EEPROM
array
2


Part Number BR9040F
Description 1/ 2/ and 4k bit EEPROMs for direct connection to serial ports
Maker Rohm
Total Page 17 Pages
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BR9040F Datasheet PDF

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