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BA6129AF データシート(PDF) 6 Page - Rohm |
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BA6129AF データシート(HTML) 6 Page - Rohm |
6 / 9 page 6 Memory ICs BA6129AF / BA6162 / BA6162F •Circuit operation These ICs have two distinct functions, a logic output function and a power supply switching function. The logic output circuit consists of the following: (1) Reset output (NPN Tr open collector) (2) CS output (PNP Tr open collector + pull-down resistor) (3) CSB output (NPN Tr open collector + pull-up resistor) The power supply switching circuit consists of a PNP power transistor and an SBD (Schottky barrier diode). The normal power supply VCC and the battery backup power supply (VBAT) are both connected to the switch- ing circuit. When the PNP power transistor is turned on and off, the IC power is switched from the normal power supply to the battery backup power supply, and vice versa. The power supply voltage detection circuit consists of a standard voltage source VREF and a hysteresis com- parator. The power supply VCC is detected using a split resistance. When the power supply voltage drops below the detection voltage (BA6129AF: VS = 3.5Vtyp. when VCC drops and VS + 0.1Vtyp. when VCC rises; BA6162 / F: VS = 4.2Vtyp. when VCC drops, and VS + 0.1Vtyp. when VCC rises), the Reset signal (Low) and the CS signal (CS-Low, CSB-High) are output by the logic output function, and the SRAM (or other memory device) is switched to backup mode. If the power supply VCC drops further and goes below the switching voltage (BA6129AF and BA6162 / F: VB = 3.3Vtyp. when VCC drops, VB + 0.1Vtyp. when VCC rises), the SBD develops a forward bias because the PNP power transistor is off. The power supply output VO switches from the power supply VCC to the battery power supply (VBAT). When the normal power supply VCC rises, the above process is reversed. Fig. 2 Timing chart VCC VO RESET CSB CS 5V OV (BA6129AF) (BA6162 / F) [ GND] [ GND] [ GND] VS [3.5VTyp.] [4.2VTyp.] VB OV VRESH VRESL VCSH VCSL VCSBH VCSBL [3.3VTyp.] [5V—VSAT1] [3V—VSAT2] [ VCC] [ VCC] [ VO] VO (Vcc) VO (BAT) |
同様の部品番号 - BA6129AF |
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同様の説明 - BA6129AF |
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