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BR25S128F-WE2 Datasheet(PDF) 4 Page - Rohm |
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BR25S128F-WE2 Datasheet(HTML) 4 Page - Rohm |
4 / 19 page Technical Note 4/18 BR25S□□□ Series www.rohm.com 2010.12 - Rev.B © 2010 ROHM Co., Ltd. All rights reserved. ●Pin assignment and description Terminal name Input /Output Function Vcc - Power source to be connected GND - All input / output reference voltage, 0V CSB Input Chip select input SCK Input Serial clock input SI Input Start bit, ope code, address, and serial data input SO Output Serial data output HOLDB Input Hold input Command communications may be suspended temporarily (HOLD status) WPB Input Write protect input Write command is prohibited Write status register command is prohibited ●Sync data input / output timing ●AC timing characteristics conditions Parameter Symbol Limits Unit Min. Typ. Max. Load capacity CL - - 30 pF Input rise time - - - 50 ns Input fall time - - - 50 ns Input voltage - 0.2Vcc/0.8Vcc V Input / Output judgment voltage - 0.3Vcc/0.7Vcc V ●Characteristic data (The following characteristic data are Typ. Values.) Vcc HOLDB SCK SI CSB SO WPB GND BR25S320-W BR25S640-W BR25S128-W BR25S256-W Fig.2 Pin assignment diagram Fig.3 Input timing CSB SCK SI SO tCS tCSS tSCKS tSCKWL tSCKWH tDIS tDIH tRC tFC High-Z SI is taken into IC inside in sync with data rise edge of SCK. Input address and data from the most significant bit MSB Fig.4 Input / Output timing CSB SCK SI SO tPD tOH tRO,tFO tOZ tCSH tSCKH tCS High-Z Fig.5 HOLD timing CSB SCK SI n+1 "H" "L" n Dn n-1 Dn Dn-1 HOLDB SO Dn+1 tHFS tHFH tHOZ tHRS tHRH tDIS tHPD High-Z SO is output in sync with data fall edge of SCK. Data is output from the most significant bit MSB. 0 0.2 0.4 0.6 0.8 1 0 12 345 6 IOL[mA] Ta=-40℃ Ta=25℃ Ta=85℃ SPEC Fig.8 "L" output voltage VOL1 (Vcc=2.5V) 0 1 2 3 4 5 6 01 2 34 56 Vcc[V] SPEC Ta=-40℃ Ta=25℃ Ta=85℃ Fig.6 "H" input voltage VIH(CSB,SCK,SI,HOLDB,WPB) 0 1 2 3 4 5 6 01 2 3 456 Vcc[V] SPEC Ta=-40℃ Ta=25℃ Ta=85℃ Fig.7 "L" input voltage VIL(CSB,SCK,SI,HOLDB,WPB) |
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