参数资料
型号: R5109N481C-TR-FE
厂商: RICOH COMPANY LTD
元件分类: 电源管理
英文描述: 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封装: HALOGEN FREE AND ROHS COMPLIANT, SSOP-8
文件页数: 14/40页
文件大小: 517K
代理商: R5109N481C-TR-FE
R510xx
21
Released Delay Time (Power-on Reset delay time)
The released delay time can be set with an external capacitor connected to the CD pin. The next equation
describes the relation between the capacitance value and the released delay time (tPLH).
tPLH (s)
=3.7 × 106 × C (F)
The capacitor connected to CD pin determines tWD, tWR, and tPLH.
When the VDD voltage becomes equal or less than (-VDET), discharge of the capacitor connected to the CD pin
starts. Therefore, if the discharge is not enough and VDD voltage returns to (+VDET) or more, thereafter the delay
time will be shorter than tPLH which is expected.
Power on Reset Operation against the input glitch (tPLH1 < tPLH)
VDD
VCD
VRESETB
Complete
Discharge
+VDET
-VDET
+VTCD
-VTCD
tPLH1
0V
tPLH
Incomplete
Discharge
Minimum Operating Voltage
We specified the minimum operating voltage as the minimum input voltage in which the condition of RESETB
pin being 0.1V or lower than 0.1V. (Herein, pull-up resistance is set as 100k
Ω in the case of the Nch open-drain
output type.)
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