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PDF BR24C21FJ Data sheet ( Hoja de datos )
| Número de pieza | BR24C21FJ | |
| Descripción | ID ROM for CRT display | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Memory ICs
BR24C21 / BR24C21F / BR24C21FJ / BR24C21FV
ID ROM for CRT display
BR24C21 / BR24C21F / BR24C21FJ / BR24C21FV
The BR24C21 series are 1kbits serial EEPROMs and support DDC1TM and DDC2TM interfaces for PLUG&PLAY
displays.
!Features
1) 128 x 8 bits serial EEPROM
2) Operating voltage range (2.5V∼5.5V)
3) Completely implements DDC1TM / DDC2TM interface
for monitor identification
Transmit-Only Mode
Recovery Mode
Bi-directional Mode
4) Page write function : 8 bytes
5) Low current consumption
Active (at 5V) : 1.5mA (Typ.)
Standby (at 5V) : 10µA (Typ.)
6) DATA security
Write enable feature
Inhibit to WRITE at low Vcc
7) Compact packages
8) High reliability fine pattern CMOS technology
9) Rewriting possible up to 100,000 times
10) Data can be stored for ten years without corruption
11) Noise filters at SCL, SDA and VCLK pins
!Absolute maximum ratings (Ta=25°C)
Parameter
Supply voltage
Symbol
VCC
Power disssipation
Pd
Storage temperature range
Tstg
Operating temperature range Topr
Terminal voltage
−
∗1 Degradation is done at 8.0mW/°C for operation above 25°C.
∗2 Degradation is done at 4.5mW/°C for operation above 25°C.
∗3 Degradation is done at 3.5mW/°C for operation above 25°C.
Limits
−0.3~+6.5
800(DIP8) ∗1
450(SOP8) ∗2
450(SOP-J8) ∗2
350(SSOP-B8) ∗3
−65~+125
−40~+85
−0.3~VCC+0.3
Unit
V
mW
°C
°C
V
!Recommended operating conditions (Ta=25°C)
Parameter
Supply voltage
Input voltage
Symbol
VCC
VIN
Limits
2.5~5.5
0~VCC
Unit
V
V
1 page  
Memory ICs
BR24C21 / BR24C21F / BR24C21FJ / BR24C21FV
!Circuit operation
The BR24C21, BR24C21F, BR24C21FJ and BR24C21FV operate in two modes, Transmit-Only Mode and Bi-directional
Mode. The devices operate in Transmit-Only Mode when they will power up. In this mode, the devices transmit data on
the SDA pin with the VCLK clock. This mode is continued by providing a valid high to low transition on the SCL pin.
The devices can be switched into Bi-directional Mode by providing a valid high to low transition on the SCL pin. They
begin to count the VCLK clock at once. If the VCLK counter reaches 128 clock without the command for Bi-directional
Mode, the device revert to Transmit-Only Mode. (Recovery function) If the devices are received the command for Bi-
directional Mode and respond with an Acknowledge before the VCLK counter reaches 128 clock, it is impossible to revert
to Transmit-Only Mode. (The way to switch Bi-directional Mode to Transmit-Only Mode is that the power down again.)
* When the power is on, the SCL pin set to VCC (High level).
(1) Transmit-Only Mode
•After the power is on, the BR24C21, BR24C21F, BR24C21FJ and BR24C21FV are in Transmit-Only Mode. In this
mode, the data can be output by providing the clock on the VCLK pin.
•When the power is on, the SCL pin set to VCC (High level).
•The state of SDA is high-impedance during input of the first 9 clocks, and a data is output starting with the 10th rising
clock edge on VCLK. After the power is on, the output data is as follow
00h address data → 01h address data → 02h address data → …
The address is incremented by one with every 9 clock of VCLK. All address is output in this mode. When the counter
reaches the last address, the next output data is 00h address data.
•In the mode, the NULL bit (High data) is output between the address data and the next address data.
•The read operation in Transmit-Only Mode can be started after the power stabilized.
VCC
SCL
VCLK
tVPU
1
SDA
VCLK
SDA
9 10
D7 D6 D5 D4
00h ADDRESS DATA
D3
Fig.10 TRANSMIT-ONLY MODE
tVHIGH tVLOW
tVPD
D1 D0
D7 D6
ADDRESS n
DATA
NULL BIT
DATA=1
ADDRESS n+1
DATA
Fig.11 NULL BIT
5 Page 
Memory ICs
BR24C21 / BR24C21F / BR24C21FJ / BR24C21FV
!External dimension (Units : mm)
9.3 ± 0.3
85
14
7.62
0.3 ± 0.1
2.54 0.5 ± 0.1 0°~15°
DIP8
4.9 ± 0.2
8765
5.0 ± 0.2
85
14
1.27 0.4 ± 0.1
0.3Min.
0.15
SOP8
3.0 ± 0.2
85
1234
0.45Min.
1.27 0.42 ± 0.1
0.1
SOP-J8
14
(0.52)
0.22 ± 0.1
0.65
0.3Min.
SSOP-B8
0.1
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet BR24C21FJ.PDF ] | |
Hoja de datos destacado
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| BR24C21FJ | ID ROM for CRT display | ROHM Semiconductor |
| BR24C21FJ | EDID Memory (For display) | ROHM Semiconductor |
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