M51957AFP Renesas Electronics Corporation., M51957AFP Datasheet

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M51957AFP

Manufacturer Part Number
M51957AFP
Description
Manufacturer
Renesas Electronics Corporation.
Datasheet

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M51957A,B/M51958A,B
Voltage Detecting, System Resetting IC Series
Description
M51957A,B/M51958A,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 include a built-in delay circuit to provide the desired retardation time simply by adding an external capacitor.
They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping
circuit.
Features
• Few external parts
• Large delay time with a capacitor of small capacitance (td ≈ 100 ms, at 0.33 µF) (M51957, M51958)
• 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
REJ03D0778-0300 Rev.3.00 Sep 18, 2007
Page 1 of 13
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
M51957AL/BL
M51958AL/BL
Outline: 5P5T
(Top view)
5
4
3
2
1
L
= 22 kΩ
Output
Delay capacitor
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)
M51957AFP/BFP
M51958AFP/BFP
(Top view)
8
7
6
5
NC
Power-supply
Output
Delay capacitor
REJ03D0778-0300
Sep 18, 2007
Rev.3.00

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M51957AFP Summary of contents

Page 1

... Pin Arrangement M51957AL/BL M51958AL/BL 5 Output 4 Delay capacitor 3 GND 2 Input 1 Power-supply (Top view) Outline: 5P5T REJ03D0778-0300 Rev.3.00 Sep 18, 2007 Page M51957AFP/BFP M51958AFP/BFP Input GND 4 5 (Top view) NC: No Connection Outline: PRSP0008DE-C (recommend) PRSP0008DA-A (8P2S-A) (not recommend for new design) REJ03D0778-0300 Rev ...

Page 2

M51957A,B/M51958A,B Block Diagram M51957A, B Power- A: Built-in Load supply B: Open Collector 5µA Typ – Input – + 1.25V GND Delay capacitor Operating Waveform M51957A, B 1.25V ≈ 0.34 × Cd(pF) µs REJ03D0778-0300 Rev.3.00 Sep ...

Page 3

M51957A,B/M51958A,B Absolute Maximum Ratings Item Symbol Supply voltage V CC Output sink current Isink Output voltage V O Power dissipation Pd Thermal derating Kθ Operating temperature Topr Storage temperature Tstg Input voltage range V IN Electrical Characteristics • “L” reset ...

Page 4

M51957A,B/M51958A,B Typical Characteristics Thermal Derating (Maximum Rating) 500 5-pin SIP 8-pin SOP 400 (PRSP0008DE-C) : recommend 300 200 100 Ambient Temperature Ta (°C) Detection Voltage vs. Supply Voltage (Input voltage detection series) 1.28 1.27 1.26 1.25 ...

Page 5

M51957A,B/M51958A,B Canstant Current at Cd pin vs. Ambient Temperature (M5195xx, External delay capacitor type) – 15V CC –10 –8 –6 –4 –2 0 –40 – Ambient Temperature Ta (°C) Output Saturation Voltage ...

Page 6

M51957A,B/M51958A,B Example of Application Circuit Reset Circuit of M5195xx Series R 1 Input R 2 Notes: 1. When the detecting supply voltage is 4.25 V, M51951, M51952, M51953 and M51954 are used. In this case, R and R are not ...

Page 7

M51957A,B/M51958A,B Delay Waveform Generating Circuit When M51957 and M51958 are used, a waveform with a large delay time can generate only by adding a small capacitor Figure 3 Delay Waveform Generating Circuit Operating Waveform (a) M51957 Input (V ...

Page 8

M51957A,B/M51958A,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 ...

Page 9

M51957A,B/M51958A,B Independent Power-supply Input M51957 Vin M51958 GND Example 1. Independent power supply system Please do enough verifying about transition characteristic of V and Calculation of detecting voltage Detecting voltage ...

Page 10

M51957A,B/M51958A,B Setting of Delay Capacity Please use capacitor Cd for the delay within the range of 10 µF or less. When a value that is bigger than this is set, the problem such as following (1), (2), and (3) becomes ...

Page 11

M51957A,B/M51958A,B Setting of Output Load Resistance (M51957B/M51958B) 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 ...

Page 12

M51957A,B/M51958A,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 REJ03D0778-0300 Rev.3.00 Sep 18, 2007 Page Weight(g) ...

Page 13

M51957A,B/M51958A,B JEITA Package Code RENESAS Code P-SOP8-4.4x5-1.27 PRSP0008DA Index mark * REJ03D0778-0300 Rev.3.00 Sep 18, 2007 Page Previous Code MASS[Typ.] 8P2S-A 0.07g NOTE) 1. DIMENSIONS "*1" ...

Page 14

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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