MB3793 Fujitsu, MB3793 Datasheet

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MB3793

Manufacturer Part Number
MB3793
Description
Manufacturer
Fujitsu
Datasheet

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FUJITSU SEMICONDUCTOR
ASSP For Power Supply Applications
BIPOLAR
Power Voltage Monitoring IC
with Watchdog Timer
MB3793
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.
FEATURES
• Precise detection of power voltage fall: 2.5%
• Detection voltage with hysteresis
• Low power dispersion: I
• Internal dual-input watchdog timer
• Watchdog-timer halt function (by inhibition pin)
• Independently-set wacthdog and reset times
PACKAGE
DATA SHEET
8-pin, Plastic SSOP
8-pin, Plastic SOP
(FPT-8P-M01)
(FPT-8P-M03)
-27A
CC
= 31 A (reference)
8-pin, Plastic SOP
8-pin, Plastic DIP
(FPT-8P-M02)
(DIT-8P-M01)
DS04-27404-2E

Related parts for MB3793

MB3793 Summary of contents

Page 1

... 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 ...

Page 2

... MB3793 -27A 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 4 5 GND (FPT-8P-M01) ...

Page 3

... 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 -27A 295 240 k 4 GND 3 ...

Page 4

... When V CC This function enables the MB3793 to detect an abnomality 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

... D Tstg — –55 Symbol Conditions Min V — 1 — – — 0.001 TP C — 0.001 TW Ta — –40 MB3793 -27A (Ta = +25 C) Rating Unit Max + +10 mA 200 mW +125 C Value Unit Typ Max — 6.0 V — — — ...

Page 6

... MB3793 -27A 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 V power 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 -27A (11) (12) (13) 7 ...

Page 8

... MB3793 -27A 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 WD long as the input clock pulse. t CKW t CKT ...

Page 10

... MB3793 -27A 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 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

... Reset output voltage vs. reset output current 1.0 0 0.5 0.4 0.3 0.2 0 (mA) Reset output current I RESET = 3.3 (V 0 0. MB3793 -27A V ( MAX TYP MIN 100 (N-MOS side ...

Page 14

... MB3793 -27A (Continued) Reset output voltage vs. power supply voltage 7 Pull-up resistance 100 Power supply voltage Watchdog timer reset time vs.ambient temperature (When monitoring ...

Page 15

... TP Reset time vs Power-on reset time setting capacitance capacitance MB3793 -27A capacitance ...

Page 16

... 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 C ...

Page 17

... V CC RESET 1 RESET Microprocessor 1 8 CK1 CK GND 7 GND CK2 4 and C ) and set time Remark 0. and 3 5 MB3793 -27A V RESET Microprocessor 2 CK GND = ...

Page 18

... Do not apply a negative voltage - Applying a negative voltage of 0 less to an LSI may generate a parasitic transistor, resulting in malfunction. ORDERING INFORMATION Part number MB3793-27AP MB3793-27APF MB3793-27APNF MB3793-27APFV resistors in series. Package Marking 8-pin Plastic DIP 3793-Y (DIP-8P-M01) 8-pin Plastic SOP ...

Page 19

... Note 4) Pins width do not include tie bar cutting remainder. 0.17 .007 2 5.30±0.30 7.80±0.40 * (.209±.012) (.307±.016) "A" 0.13(.005) M Dimensions in mm (inches) . Note : The values in parentheses are reference values. MB3793 -27A +0.03 –0.04 +.001 –.002 Details of "A" part +0.25 2.00 –0.15 (Mounting height) +.010 .079 – ...

Page 20

... MB3793 -27A 8-pin Plastic SOP (FPT-8P-M02) +0.25 +.010 * 1 5.05 .199 –0.20 –.008 8 1 1.27(.050) 0.10(.004) 0.10(.004) 2002 FUJITSU LIMITED F08004S-c-4 Note These dimensions include resin protrusion. Note These dimensions do not include resin protrusion. Note 3) Pins width and pins thickness include plating thickness. ...

Page 21

... Details of "A" part 1.25 .049 "A" 0~8 ˚ 0.10(.004) M 0.50±0.20 (.020±.008) 0.60±0.15 (.024±.006) Dimensions in mm (inches) . Note : The values in parentheses are reference values. MB3793 -27A +0.20 –0.10 (Mounting height) +.008 –.004 0.25(.010) 0.10±0.10 (.004±.004) (Stand off) (Continued) 21 ...

Page 22

... MB3793 -27A (Continued) 8-pin Plastic DIP (DIP-8P-M01) 4.36(.172)MAX 3.00(.118)MIN +0.30 0.99 –0 +.012 .039 –0 +0.35 0.89 –0.30 +.014 .035 –.012 1994 FUJITSU LIMITED D08006S-2C +0.40 9.40 –0.30 +.016 .370 –.012 6.20±0.25 1 PIN INDEX (.244±.010) 0.51(.020)MIN 0.25±0.05 (.010±.002) 0.46±0.08 (.018± ...

Page 23

... MB3793 -27A 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, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of Fujitsu semiconductor device ...

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