m62021p Renesas Electronics Corporation., m62021p Datasheet

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m62021p

Manufacturer Part Number
m62021p
Description
System Reset Ic With Switch For Memory Backup
Manufacturer
Renesas Electronics Corporation.
Datasheet
M62021L/P/FP
System Reset IC with Switch for Memory Backup
Description
The M62021 is a system IC that controls the memory backup function of microcomputer (internal RAM).
The IC outputs reset signals (RES/RES) to a microcomputer at power-down and power failure. It also shifts the power
supply to RAM from main to backup, outputs a signal (CS) that invokes standby mode, and alters RAM to backup
circuit mode.
The M62021 contains, in a single chip, power supply monitor and RAM backup functions needed for a microcomputer
system, so that the IC makes it possible to construct a system easily and with fewer components compared with a
conventional case that uses individual ICs and discrete components.
Features
• Built-in switch for selection between main power supply and backup power supply to RAM.
• Small difference between input and output voltage (I
• Detection voltage (power supply monitor voltage) 4.40 V ± 0.2 V
• Chip select signal output (CS)
• Two channels of reset outputs (RES/RES)
• Power on reset circuit built-in
• Delay time variable by an external capacitance connected to Ct pin
• Facilitates to form backup function with a few number of components
Application
• Power supply control systems for memory backup of microcomputer system and SRAM boards with built-in backup
Block Diagram
REJ03D0784-0200 Rev.2.00 Jun 15, 2007
Page 1 of 13
function that require switching between external power supply and battery.
RES
RES
V
IN
3
7
5
R
R
1
2
1.24V
+
Com
OUT
= 80 mA, V
Reset
circuit
SW
GND
Delay
circuit
6
IN
= 5 V) 0.2 V Typ
D
1
1
2 V
8 CS
4 Ct
V
OUT
BAT
REJ03D0784-0200
Jun 15, 2007
Rev.2.00

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m62021p Summary of contents

Page 1

M62021L/P/FP System Reset IC with Switch for Memory Backup Description The M62021 is a system IC that controls the memory backup function of microcomputer (internal RAM). The IC outputs reset signals (RES/RES microcomputer at power-down and power failure. ...

Page 2

... GND Ct (Delay capcitance) 5 RES 4 Ct (Delay capcitance BAT 1 V OUT (Top view) Outline: PRSS0008AA-A (8P5) [L] REJ03D0784-0200 Rev.2.00 Jun 15, 2007 Page M62021P M62021FP OUT RES BAT GND RES (Top view) Outline: PRDP0008AA-A (8P4) [P] ...

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M62021L/P/FP Absolute Maximum Ratings Item Symbol Input voltage V IN Output current I OUT Power dissipation Pd Thermal derating Kθ Operating temperature Topr Storage temperature Tstg Electrical Characteristics Item Symbol Detection voltage V ∆V Hysteresis voltage Temperature coefficient of V ...

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M62021L/P/FP Test Circuit SW2 Im1 R Vm1 1 SW1 RES 7 RES 5 Switch Matrix Item Symbol Circuit current OUT CS Detection voltage ...

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M62021L/P/FP Pin Description Pin No. Pin Name Symbol 1 Power supply output V 2 Backup power supply V input 3 Power supply input V 4 Delay capacitor Ct connection pin 5 Positive reset output RES 6 Ground GND RES 7 ...

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M62021L/P/FP Configuration Power Supply Detection The internal reference voltage Vref is compare by means of a comparator with resistor-divided voltage V divided voltage produced by R and the input voltage set to ...

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M62021L/P/FP Schmitt Trigger Circuit Since waveforms show a gentle rise due to the RC delay circuit, INV1, INV2, R5, and R6 constitute a Schmitt trigger circuit to produce hysteresis prevent each output from chattering. Internal Circuit Ct ...

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M62021L/P/FP Timing Chart OUT CS RES RES Input In Normal Operation Voltage Input voltage: 5V Output Pin V With Q4 set to ON, OUT a voltage (V – DROP is output ...

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... M62021L/P/FP Typical Characteristics Thermal Derating (Maximum Rating) 1000 M62021L 800 M62021P 600 M62021FP 400 200 Ambient Temperature Ta (°C) Detection Voltage vs. Ambient Temperature 4.48 4.46 4.44 4.42 4.40 4.38 4.36 4.34 4.32 –40 – Ambient Temperature Ta (°C) Circuit Curent vs. Ambient Temperature –40 – ...

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M62021L/P/FP Output Curent vs. Difference between Input and Output Voltages 100 100 150 Difference between Input and Output Voltages V (mV) DROP Backup Di Forward Direction Current vs. Backup ...

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M62021L/P/FP CS "L" Output Voltage vs. Ambient Temperature 160 140 Isink = 1mA 120 100 –40 – Ambient Temperature Ta (°C) Delay Time vs. External Capacitance Connected to ...

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M62021L/P/FP Package Dimensions JEITA Package Code RENESAS Code P-SIP8-6.4x19-2.54 PRSS0008AA-A JEITA Package Code RENESAS Code P-DIP8-6.3x8.84-2.54 PRDP0008AA REJ03D0784-0200 Rev.2.00 Jun 15, 2007 Page Previous Code ...

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M62021L/P/FP JEITA Package Code RENESAS Code P-SOP8-4.4x4.85-1.27 PRSP0008DE Index mark JEITA Package Code RENESAS Code P-SOP8-4.4x5-1.27 PRSP0008DA Index mark * REJ03D0784-0200 Rev.2.00 Jun 15, 2007 Page ...

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Notes: 1. This document is provided for reference purposes only so that Renesas customers may select the appropriate Renesas products for their use. Renesas neither makes warranties or representations with respect to the accuracy or completeness of the information contained ...

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