m51945a Renesas Electronics Corporation., m51945a Datasheet

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m51945a

Manufacturer Part Number
m51945a
Description
Voltage Detecting, System Resetting Ic Series
Manufacturer
Renesas Electronics Corporation.
Datasheet

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M51945A,B/M51946A,B
Voltage Detecting, System Resetting IC Series
Description
M51945A,B/M51946A,B are semiconductor integrated circuits for resetting of all types of logic circuits such as CPUs,
and has the feature of setting the detection voltage by adding external resistance.
They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping
circuit.
Features
• Few external parts
• Low threshold operating voltage (Supply voltage to keep low-state at low supply voltage):
• Wide supply voltage range: 2 V to 17 V
• Wide application range
Application
• Reset circuit of Pch, Nch, CMOS, microcomputer, CPU and MCU, Reset of logic circuit, Battery check circuit,
Recommended Operating Condition
• Supply voltage range: 2 V to 17 V
Pin Arrangement
REJ03D0774-0300 Rev.3.00 Sep 18, 2007
Page 1 of 10
0.6 V (Typ) at R
switching circuit back-up voltage, level detecting circuit, waveform shaping circuit, delay waveform generating
circuit, DC/DC converter, over voltage protection circuit
M51945AL/BL
M51946AL/BL
Outline: 5P5T
(Top view)
5
4
3
2
1
L
= 22 kΩ
Output
NC
GND
Input
Power-supply
Input
GND
NC: No Connection
NC
NC
Outline: PRSP0008DE-C (recommend)
1
2
3
4
PRSP0008DA-A (8P2S-A) (not recommend for new design)
M51945AFP/BFP
M51946AFP/BFP
(Top view)
8
7
6
5
NC
Power-supply
Output
NC
REJ03D0774-0300
Sep 18, 2007
Rev.3.00

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m51945a Summary of contents

Page 1

... Voltage Detecting, System Resetting IC Series Description M51945A,B/M51946A,B are semiconductor integrated circuits for resetting of all types of logic circuits such as CPUs, and has the feature of setting the detection voltage by adding external resistance. They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping circuit ...

Page 2

... M51945A,B/M51946A,B Block Diagram M51945A, B Power- supply 25µA Typ – Input + 1.25V GND Operating Waveform M51945A, B 1.25V H L REJ03D0774-0300 Rev.3.00 Sep 18, 2007 Page Built-in Load B: Open Collector Output Input 1.25V 1.25V M51946A, B Power- A: Built-in Load supply B: Open Collector 25µ ...

Page 3

... Power dissipation Pd Thermal derating Kθ Operating temperature Topr Storage temperature Tstg Input voltage range V IN Electrical Characteristics • “L” reset type M51945A, M51945B • “H” reset type M51946A, M51946B Item Symbol Min Detecting voltage V 1.20 S ∆V Hysteresis voltage S Detecting voltage V /∆ ...

Page 4

... M51945A,B/M51946A,B Typical Characteristics Thermal Derating (Maximum Rating) 500 5-pin SIP 8-pin SOP 400 (PRSP0008DE-C) : recommend 8-pin SOP 300 (PRSP0008DA-A) : not recommend 200 100 Ambient Temperature Ta (°C) Detection Voltage vs. Supply Voltage (Input voltage detection series) 1.28 1.27 1.26 1.25 1.24 1.23 1. Supply Voltage V ...

Page 5

... M51945A,B/M51946A,B Example of Application Circuit Reset Circuit of M5194xx Series R 1 Input R 2 Notes: 1. When the detecting supply voltage is 4.25 V, M51943 and M51944 are used and R When the voltage is anything except 4.25 V, M51945 and M51946 are used. In this case, the detecting supply voltage is 1.25 × and 15 V ...

Page 6

... M51945A,B/M51946A,B Notice for use About the Power Supply Line 1. About bypass capacitor Because the ripple and the spike of the high frequency noise and the low frequency are superimposed to the power supply line necessary to remove these. Therefore, please install C and C 1 and the GND line as shown in following figure 2 ...

Page 7

... M51945A,B/M51946A,B Independent Input M51945 Vin M51946 GND Example 1. Independent power supply system Please do enough verifying about transition characteristic of V and Calculation of detecting voltage Detecting voltage Vs can be calculated by the following expression. However, the error margin is caused in the detecting voltage because input current Iin (standard 100 nA) exists if it sets too big resistance ...

Page 8

... M51945A,B/M51946A,B Setting of Output Load Resistance (M51945B/M51946B) High level output voltage can be set without depending on the power-supply voltage because the output terminal is an open collector type. However, please guard the following notes. 1. Please set it in value ( within the range of the power-supply voltage recommendation. ...

Page 9

... M51945A,B/M51946A,B Package Dimensions 5P5T EIAJ Package Code JEDEC Code – SIP5-P-240-2. SEATING PLANE JEITA Package Code RENESAS Code P-SOP8-4.4x4.85-1.27 PRSP0008DE Index mark REJ03D0774-0300 Rev.3.00 Sep 18, 2007 Page Weight(g) Lead Material 0.22 Cu Alloy ...

Page 10

... M51945A,B/M51946A,B JEITA Package Code RENESAS Code P-SOP8-4.4x5-1.27 PRSP0008DA Index mark * REJ03D0774-0300 Rev.3.00 Sep 18, 2007 Page Previous Code MASS[Typ.] 8P2S-A 0.07g NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET ...

Page 11

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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