IC PWR VOLT MON WD TIMER 8SOP

MB3793-45PF-G-BND-JN-6E1

Manufacturer Part NumberMB3793-45PF-G-BND-JN-6E1
DescriptionIC PWR VOLT MON WD TIMER 8SOP
ManufacturerFujitsu Semiconductor America Inc
TypeSimple Reset/Power-On Reset
MB3793-45PF-G-BND-JN-6E1 datasheet
 


Specifications of MB3793-45PF-G-BND-JN-6E1

Number Of Voltages Monitored1OutputCMOS Inverted
ResetActive LowReset Timeout80 ms Minimum
Voltage - Threshold4.5VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case8-SOP
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names865-1030
MB3793-45PF-G-JN-6E1
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FUJITSU SEMICONDUCTOR
DATA SHEET
ASSP For Power Supply Applications
BIPOLAR
Power Voltage Monitoring IC
with Watchdog Timer
MB3793
-45
DESCRIPTION
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer.
A reset signal is output when the power is cut or falls abruptly. When the power recovers normally after resetting,
a power-on reset signal is output to microprocessor units (MPUs). An internal watchdog timer with two inputs for
system operation diagnosis can provide a fall-safe function for various application systems.
There is also a mask option that can detect voltages of 4.9 to 2.4 V in 0.1-V steps.
The model number is MB3793-45 corresponding to the detected voltage. The model number and package code
are as shown below.
Model No.
MB3793-45
FEATURES
• Precise detection of power voltage fall: 2.5%
• Detection voltage with hysteresis
• Low power dispersion: I
= 31 A (reference)
CC
• Internal dual-input watchdog timer
• Watchdog-timer halt function (by inhibition pin)
• Independently-set wacthdog and reset times
PACKAGE
8-pin plastic SOP
(FPT-8P-M01)
Package code
Detection voltage
3793-7
4.5 V
8-pin plastic SOL
(FPT-8P-M02)
DS04-27405-1E

MB3793-45PF-G-BND-JN-6E1 Summary of contents

  • Page 1

    ... There is also a mask option that can detect voltages of 4 0.1-V steps. The model number is MB3793-45 corresponding to the detected voltage. The model number and package code are as shown below. Model No. ...

  • Page 2

    ... MB3793-45 PIN ASSIGNMENT PIN DESCRIPTION Pin no. Symbol Descriptions 1 RESET Outputs reset pin Watchdog timer monitor time 2 CTW setting pin Power-on reset hold time 3 CTP setting pin 4 GND Ground pin 2 (Top view RESET 2 7 CTW 3 6 CTP GND 4 5 (FPT-8P-M01) (FPT-8P-M02) Pin no. ...

  • Page 3

    ... BLOCK DIAGRAM all blocks CC CTP 3 1 RESET Output circuit INH 6 CTW 2 Watchdog timer Pulse generator 1 CK1 8 Pulse generator 2 7 CK2 . . Logic circuit Comp.S Reference voltage generator . REF To GND of all blocks MB3793- 650 240 k 4 GND 3 ...

  • Page 4

    ... Comp comparator with hysteresis to compare the reference voltage with a voltage (V of dividing the power voltage (V This function enables the MB3793 to detect an abnormality within 1 s when the power is cut or falls abruptly. 2. Output circuit The output circuit contains a RESET output control comparator that compares the voltage at the CTP pin to the threshold voltage to release the RESET output if the CTP pin voltage exceeds the threshold value ...

  • Page 5

    ... INH I OL — – +85 C — D Tstg — –55 Symbol Conditions Min. V — 1 — – — 0.001 TP C — 0.001 TW Ta — –40 MB3793-45 (Ta = +25 C) Rating Unit Max +10 mA 200 mW +125 C Value Unit Typ. Max. — 6.0 V — — — — + ...

  • Page 6

    ... MB3793-45 ELECTRICAL CHARACTERISTICS 1. DC Characteristics Parameter Symbol Power supply current Detection voltage Detection voltage hysteresis V difference V Clock-input threshold voltage V Clock-input hysteresis V Inhibition-input voltage Input current (CK1, CK2, INH) V Reset output voltage Reset-output minimum power V voltage *: The values enclosed in parentheses () are setting assurance values. ...

  • Page 7

    ... DIAGRAM 1. Basic operation (Positive clock pulse CK1 t CKT CK2 INH V th CTP V H CTW V L RESET t PR (1) (2) (3) t CKW (4)(5) (5) (6) (7) (8) (9) (10) MB3793-45 (11) (12) (13) 7 ...

  • Page 8

    ... MB3793-45 2. Basic operation (Negative clock pulse CK1 t CKT CK2 INH V th CTP V H CTW V L RESET t PR (1) (2) (3) (4)(5) ( CKW (6) (7) (8) (9) (10) (11) (12) (13) ...

  • Page 9

    ... CK2 V th CTP V H CTW V L RESET Note: The MB3793 can monitor only one clock. The MB3793 checks the clock signal at every other input pulse. Therefore, set watchdog timer monitor time t the period twice as long as the input clock pulse. t CKW t CKT ...

  • Page 10

    ... MB3793-45 4. Inhibition operation (Positive clock pulse CK1 CK2 INH V th CTP V H CTW V L RESET t PR (1) (2) ( CKW (4)(5) (5) (6) (7) (11) (8) (9) (10) (12) (13) ...

  • Page 11

    ... Clock monitoring To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2. Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock signal at every other input pulse. See “3. Single-clock input monitoring (positive clock pulse)” under “ DIAGRAM”. ...

  • Page 12

    ... The value about 100 with V The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses clock pulse is input, the MB3793 repeats operations (6) and (7). ( lowered to the fall-time detected voltage (V CC MB3793 outputs a reset signal (setting the RESET pin to “L” level from “H” level). ...

  • Page 13

    ... APPLICATION EXAMPLE 1. Supply voltage monitor and watchdog timer (1-clock monitor GND *: Use a capacitor with less leakage current. The MB3793 monitors the clock (CK1/2) at every other input pulse. 2. Supply voltage monitor and watchdog timer stop INH CTW GND 3 CTP 4 GND *: Use a capacitor with less leakage current. ...

  • Page 14

    ... TYPICAL APPLICATION GND *: Use a capacitor with less leakage current. 1. Equation of time-setting capacitances ( [ms [ms However, when . = t [ms Values and D A 1300 2. (Example) when C time (ms CTW RESET 1 RESET MB3793 Microprocessor 1 8 CTP CK1 CK 7 INH GND CK2 4 and [ms] about 10 1500 3 100 = 0 0.01 F and F ...

  • Page 15

    ... ORDERING INFORMATION Part number MB3793-45PF MB3793-45PNF Package 8-pin Plastic SOP (FPT-8P-M01) 8-pin Plastic SOL (FPT-8P-M02) MB3793-45 Remarks 15 ...

  • Page 16

    ... MB3793-45 PACKAGE DIMENSIONS 8-pin plastic SOP (FPT-8P-M01) +0.25 +.010 6.35 .250 –0.20 –.008 INDEX 1.27(.050) TYP 3.81(.150)REF "A" 0.10(.004) 2000 FUJITSU LIMITED F08002S-4C 5.30±0.30 7.80±0.40 (.209±.012) (.307±.016) 0.45±0.10 Ø0.13(.005) M (.018± ...

  • Page 17

    ... M (.017±.004) 0.10(.004) MB3793-45 1.55±0.20(.061±.008) (Mounting height) 0.15±0.10 (STAND OFF) (.006±.004) 5.00±0.30 (.197±.012) 0.20±0.05 0.50±.020 (.008± ...

  • Page 18

    ... MB3793-45 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, ...