BR34L02FV-W View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

View to exact match

BR34L02FV-W

256×8 bit Electrically Erasable PROM (based on Serial Presence Detect)

ROHM Semiconductor 

Memory ICs

BR34L02FV-W

• The maximum value of RS

The maximum value of RS is determined by following factors.

c SDA rise time determined by RPU and the capacitance of bus line (CBUS) of SDA must be less than tR. And the

other timing must also keep the conditions of the AC timing.

d When the device outputs LOW on SDA line, the voltage of the bus A determined by RPU and RS must be

lower than the inputs LOW level of the controller, including recommended noise margin (0.1VCC).

(VCC−VOL) × RS

RPU+RS

+ VOL+0.1VCC ≤ IOL

RS ≤

VIL−VOL−0.1VCC

1.1VCC−IIL

× RPU

Examples : When VCC=3V, VIL=0.3VCC, VOL=0.4V, RPU=20kΩ

According to 2

RS ≤ 0.3×3−0.4−0.1×3 × 20×103

1.1×3−0.3×3

≤ 1.67 [kΩ]

VCC

A

RPU

RS

VOL

CAPACITANCE OF

BUS LINE (CBUS)

VIL

CONTROLLER

EEPROM

• The minimum value of Rs

The minimum value of RS is determined by the current overload due to the conflict on the bus.

The current overload may cause noises on the power line and instantaneous power down.

The following conditions must be met, where Ι is the maximum permissible current.

The maximum permissible current depends on VCC line impedance and so on. It need to be less than 10mA for

EEPROM.

VCC ≤ Ι

RS

RS ≥

VCC

Ι

RPU

RS

"H" OUTPUT

MAXIMUM

CURRENT Ι

"L" OUTPUT

Examples : When VCC=3V, Ι=10mA

RS ≥

3

10×10−3

≥ 300 [Ω]

CONTROLLER

EEPROM

Rev.A 20/24

Share Link: