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BR35H160-WC Datasheet(PDF) 11 Page - Rohm |
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BR35H160-WC Datasheet(HTML) 11 Page - Rohm |
11 / 17 page Technical Note 11/16 BR35H□□□-WC Series www.rohm.com 2011.03 - Rev.C © 2011 ROHM Co., Ltd. All rights reserved. ● High speed operations In order to realize stable high speed operations, pay attention to the following input / output pin conditions. ○ Input pin pull up, pull down resistance When attaching pull up, pull down resistance to the EEPROM input pin, select an appropriate value for the microcontroller VOL, IOL from the VIL characteristics of this IC. ○ Pull up resistance Also, in order to prevent malfunction or erroneous write at power ON/OFF, be sure to make CSB pull up. ○ Pull down resistance The operations speed changes according to the amplitude VIHE, VILE of the signals input to the EEPROM. More stable high speed operations can be realized by inputting signals with Vcc / GND levels of amplitude. On the contrary, when signals with an amplitude of 0.8Vcc / 0.2Vcc are input, operation speed slows down. *1 In order to realize more stable high speed operation, it is recommended to set the values of RPU, RPD as large as possible, and to have the amplitude of the signals input to the EEPROM close to the Vcc / GND amplitude level. ( *1 In this case, the guaranteed value of operating timing is guaranteed.) ○ SO load capacitance condition The load capacitance of the SO output pin affects the SO output delay characteristic. (Data output delay time, time from HOLDB to High-Z, output rise time, output fall time.). Make the SO load capacitance small to improve the output delay characteristic. ○ Other cautions Make all wires from the microcontroller to EEPROM input pin the same length. This in order to prevent setup / hold violation to the EEPROM. IOLM VILE VOLM “L” output “L” input Microcontroll EEPROM RPU Fig.44 Pull up resistance RPU≧ 5-0.4 2×10 -3 ∴ RPU≧ 2.3[kΩ] Example) When Vcc=5V, VILE=1.5V, VOLM=0.4V, IOLM=2mA, from the equation ①, IOHM VIHE VOHM Microcontroll EEPROM “H” output “H” input RPD Fig.45 Pull down resistance RPD≧ VOHM IOHM ・・・③ VOHM≧ VIHE ・・・④ Example) When VCC=5V, VOHM=VCC-0.5V, IOHM=0.4mA, VIHE=VCC×0.7V, from the equation③, RPD≧ 5-0.5 0.4×10 -3 ∴ RPU≧ 11.3[kΩ] EEPROM SO CL Fig.46 SO load dependency of data output delay time tPD RPU≥ VCC-VOLM IOLM ・・・① VOLM≤ VILE ・・・② With the value of Rpu to satisfy the above equation, VOLM becomes 0.4V or lower, and with VILE (=1.5V), the equation ② is also satisfied. ・ VILE :EEPROM VIL specifications ・ VOLM :Microcontroller VOL specifications ・ IOLM :Microcontroller IOL specifications |
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