THIS SPEC IS OBSOLETE
Spec No: 002-08559
Spec Title: MB3793-28A POWER-VOLTAGE MONITORING
IC WITH WATCHDOG TIMER DATASHEET
Replaced by: NONE
Cypress Semiconductor Corporation • 198 Champion Court • San Jose,CA 95134-1709 • 408-943-2600
Document Number: 002-08559 Rev. *D Revised January 25, 2019
MB3793-28A
Power-Voltage Monitoring IC
with Watchdog Timer Datasheet
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 fail-safe function for various
application systems.
Features
■Precise detection of power voltage fall: ±2.5%
■Detection voltage with hysteresis
■Low power dispersion: ICC = 41 μA (Typ)
■Internal dual-input watchdog timer
■Watchdog timer halt function
■Independently-set watchdog and reset times
Application
■Arcade Amusement etc.
Model No. Marking Code Detection voltage
MB3793-28A 3793AR 2.8 V
Document Number: 002-08559 Rev. *D Page 2 of 23
MB3793-28A
Contents
Description ........................................................................ 1
Features ............................................................................. 1
Application ........................................................................ 1
Contents ............................................................................ 2
1. Pin Assignment ...................................................3
2. Pin Description ....................................................3
3. Block Diagram .....................................................4
4. Block Functions ..................................................5
4.1 Comp. S ................................................................ 5
4.2 Output circuit ......................................................... 5
4.3 Pulse generator ..................................................... 5
4.4 Watchdog timer ..................................................... 5
4.5 Logic circuit ........................................................... 5
5. Absolute Maximum Ratings ...............................6
6. Recommended Operating ConditionS ..............6
7. Electrical Characteristics ...................................7
7.1 DC Characteristics ................................................ 7
7.2 AC Characteristics ................................................. 7
8. Timing Diagram ...................................................8
8.1 Basic operation (Positive clock pulse) ..................8
8.2 Basic operation (Negative clock pulse) ................ 9
8.3 Single-clock input monitoring (Positive clock pulse) 10
8.4 Inhibition operation (Positive clock pulse) ........... 11
8.5 Clock pulse input supplementation
(Positive clock pulse) ........................................................ 12
9. Operation Sequence .........................................13
9.1 Positive clock pulse input .................................... 13
9.2 Negative clock pulse input ................................... 13
9.3 Single-clock input monitoring ..............................13
9.4 Description of Operations .................................... 13
10. Typical Characteristics ..................................15
11. Application Example .......................................18
11.1 Supply voltage monitor and watchdog timer ..... 18
11.2 Supply voltage monitor and watchdog timer stop 19
11.3 Setting of compulsory reset ..............................19
12. Usage Precaution ............................................20
13. Ordering Information ......................................20
14. RoHS Compliance Information of Lead (Pb)
Free version ...........................................................20
15. Package Dimensions ......................................21
16. Document History ...........................................22
Sales, Solutions, and Legal Information ...................... 23
Document Number: 002-08559 Rev. *D Page 3 of 23
MB3793-28A
1. Pin Assignment
2. Pin Description
Pin No. Symbol Description
1 RESET Outputs reset pin
2 CTW Sets watchdog timer monitoring time pin
3 CTP Sets power-on reset hold time pin
4 GND Ground pin
5 VCC Power supply pin
6INH
This pin forces the watchdog timer on/off. When this pin is High level, the watch-
dog timer is stopped.
7 CK2 Inputs clock 2 pin
8 CK1 Inputs clock 1 pin
(SOB008)
CTW
CTP
GND VCC
INH
CK2
CK1
(TOP VIEW)
1
2
3
4
8
7
6
5
RESET
Document Number: 002-08559 Rev. *D Page 4 of 23
MB3793-28A
3. Block Diagram
I1 = 3 μA
..I2 = 30 μA
..
R1 =
315 kΩ
..
3
1
6
2
8
7
5
4
CTP
To VCC of all blocks
Pulse generator 1
Watchdog
timer
Reference
voltage
generator
To GND of
all blocks
Pulse generator 2
Output circuit
Logic circuit
RESET
INH
CTW
CK1
CK2
VCC
GND
Comp.S
−
+
VS
VREF = 1.24 V
..
R2 =
240 kΩ
..
Document Number: 002-08559 Rev. *D Page 5 of 23
MB3793-28A
4. Block Functions
4.1 Comp. S
Comp. S is a comparator with hysteresis to compare the reference voltage with a voltage (VS) that is the result of dividing the power
voltage (VCC) by resistors R1 and R2. When VS falls below 1.24 V, a reset signal is output. This function enables the MB3793 to detect
an abnormality within 1 μs when the power is cut or falls abruptly.
4.2 Output Circuit
The output circuit has a comparator to control the reset signal (RESET) output. When the voltage at the CTP pin for setting the
power-on reset hold time exceeds the threshold voltage, resetting is canceled.
Since the reset (RESET) output buffer has the CMOS organization, no pull-up resistor is needed.
4.3 Pulse Generator
The pulse generator generates pulses when the voltage at the CK1 and CK2 input clock pins changes from Low level to High level
(positive-edge trigger) and exceeds the threshold voltage; it sends the clock signal to the watchdog timer.
4.4 Watchdog Timer
The watchdog timer can monitor two clock pulses. Short-circuit the CK1 and CK2 clock pins to monitor a single clock pulse.
4.5 Logic Circuit
Logic circuit controls charging and discharging of the power-on reset hold time setting capacity (CTP) on a signal of Comp.S and
Watchdog timer.
Document Number: 002-08559 Rev. *D Page 6 of 23
MB3793-28A
5. Absolute Maximum Ratings
* : The voltage is based on the ground voltage (0 V).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.)
in excess of absolute maximum ratings. Do not exceed these ratings.
6. Recommended Operating Conditions
* : The watchdog timer monitor time range depends on the rating of the setting capacitor.
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor
device. All of the device's electrical characteristics are warranted when the device is operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on the
data sheet. Users considering application outside the listed conditions are advised to contact their
representatives beforehand.
Parameter Symbol Conditions Rating Unit
Min Max
Power supply voltage* VCC —−0.3 +7V
Input voltage*
CK1 VCK1 —
−0.3 VCC + 0.3
( ≤ +7) VCK2 VCK2 —
INH VINH —
Reset output voltage*
RESET
VOL
VOH
—−0.3 VCC + 0.3
( ≤ +7) V
Reset output current IOL
IOH
—−10 +10 mA
Power dissipation PDTa ≤ +85 ⋅C200 mW
Storage temperature Tstg — −55 +125 °C
Parameter Symbol Conditions Value Unit
Min Typ Max
Power supply voltage VCC — 1.2 3.3 4.0 V
Reset (RESET) output current
IOL —0— + 5
mA
IOH —−5— 0
Power-on reset hold time setting
capacity CTP — 0.001 0.1 10 μF
Watchdog-timer monitoring time
setting capacity* CTW — 0.001 0.01 1 μF
Operating ambient temperature Ta — −40 +25 +85 °C
Document Number: 002-08559 Rev. *D Page 7 of 23
MB3793-28A
7. Electrical Characteristics
7.1 DC Characteristics
* : This parameter is guaranteed by design, which is not supported by a final test.
7.2 AC Characteristics
*: The voltage range is 10% to 90% at testing the reset output transition time.
(VCC = +3.3 V, Ta = +25°C)
Parameter Symbol Conditions Value Unit
Min Typ Max
Power current ICC1 After exit from reset ⎯41 55 μA
Detection voltage
VSL VCC falling
Ta = +25°C 2.73 2.80 2.87 V
Ta = −40 to +85°C 2.69* 2.80 2.91*
VSH VCC rising
Ta = +25°C 2.80 2.87 2.94 V
Ta = −40 to +85°C 2.76* 2.87 2.98*
Detection voltage hysteresis difference VSHYS VSH - VSL 25 70 100 mV
CK input threshold voltage
VCIH ⎯0.7* 1.3 1.9 V
VCIL ⎯0.5 1.0 1.5* V
CK input hysteresis VCHYS ⎯0.1* 0.3 0.6* V
INH input voltage
VIIH ⎯2.2 ⎯VCC V
VIIL ⎯0⎯0.8 V
Input current
(CK1,CK2,INH)
IIH VIH = VCC ⎯01.0μA
IIL VIL = 0 V −1.0 0 ⎯μA
Reset output voltage
VOH IRESET = −3 mA 2.8 3.1 ⎯V
VOL IRESET = +3 mA ⎯0.12 0.4 V
Reset-output minimum power voltage VCCL IRESET = +50 μA⎯0.8 1.2 V
(VCC = +3.3 V, Ta = +25°C)
Parameter Symbol Conditions Value Unit
Min Typ Max
Power-on reset hold time tPR CTP = 0.1 μF 30 75 120 ms
Watchdog timer monitoring time tWD CTW = 0.01 μF,
CTP = 0.1 μF81624ms
Watchdog timer reset time tWR CTP = 0.1 μF25.59ms
CK input pulse width tCKW ⎯500 ⎯⎯ns
CK input pulse cycle tCKT ⎯20 ⎯⎯μs
Reset (RESET) output transition time
Rising tr* CL = 50 pF ⎯⎯500 ns
Falling tf* CL = 50 pF ⎯⎯500 ns
Document Number: 002-08559 Rev. *D Page 8 of 23
MB3793-28A
8. Timing Diagram
8.1 Basic Operation (Positive Clock Pulse)
CTP
RESET
INH
CTW
CK1
CK2
VSH
VCC
VSL
Vth
VH
VL
(1) (2) (3) (4)(5) (5) (6) (7) (8) (9) (10) (11) (12) (13)
tPR tWD tPR
tWR
tCKW
tCKT
Document Number: 002-08559 Rev. *D Page 9 of 23
MB3793-28A
8.2 Basic Operation (Negative Clock Pulse)
CTP
RESET
INH
CTW
CK1
CK2
VSH
VCC
VSL
Vth
VH
VL
tPR tWD tPR
tWR
tCKW
tCKT
(1) (2) (3) (4)(5) (5) (6) (7) (8) (9) (10) (11) (12) (13)
Document Number: 002-08559 Rev. *D Page 10 of 23
MB3793-28A
8.3 Single-clock Input Monitoring (Positive Clock Pulse)
CTP
RESET
CTW
CK1
Vth
VH
VL
CK2
tWR
tWD
tCKT
tCKW
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 tWD to the time that allows the MB3793
to monitor the period twice as long as the input clock pulse.
Document Number: 002-08559 Rev. *D Page 11 of 23
MB3793-28A
8.4 Inhibition Operation (Positive Clock Pulse)
Document Number: 002-08559 Rev. *D Page 12 of 23
MB3793-28A
8.5 Clock Pulse Input Supplementation (Positive Clock Pulse)
CTW
CK1
CK2
VH
VL
tCKT
tCKW *1
*2
Note : The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity
(CTW) switches to charging from discharging.
When two consecutive pulses occur on one side of this alternation before switching, the second
pulse is ignored.
In the above figure, pulse *1 and *2 are ignored.
Document Number: 002-08559 Rev. *D Page 13 of 23
MB3793-28A
9. Operation Sequence
9.1 Positive Clock Pulse Input
Refer to “Basic Operation (Positive Clock Pulse)” under “Timing Diagram”.
9.2 Negative Clock Pulse Input
Refer to “Basic Operation (Negative Clock Pulse)” under “Timing Diagram”.
The MB3793 operates in the same way whether it inputs positive or negative pulses.
9.3 Single-clock Input 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.
Refer to “Single-clock Input Monitoring (Positive Clock Pulse)” under “Timing Diagram”.
9.4 Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “Timing Diagram”.
(1) The MB3793 outputs a reset signal when the supply voltage (VCC) reaches about 0.8 V (VCCL)
(2) If VCC reaches or exceeds the rise-time detected voltage VSH, the MB3793 starts charging the power-on
reset hold time setting capacitor CTP. At this time, the output remains in a reset state. The VSH value is
2.87 V (Typ) .
(3) When CTP has been charged for a certain period of time TPR (until the CTP pin voltage exceeds the
threshold voltage (Vth) after the start of charging), the MB3793 cancels the reset (setting the RESET pin
to “H” level from “L” level).
The Vth value is about 2.4 V with VCC = 3.3 V
The power-on reset hold time tPR is set with the following equation:
tPR (ms) ≈ A × CTP (μF)
The value of A is about 750 with VCC = 3.3 V and about 700 with VCC = 3.0 V. The MB3793 also starts
charging the watchdog timer monitor time setting capacitor (CTW).
(4) When the voltage at the watchdog timer monitor time setting pin CTW reaches the “H” level threshold
voltage VH, the CTW switches from the charge state to the discharge state.
The value of VH is always about 1.24 V regardless of the detected voltage.
(5) If the CK2 pin inputs a clock pulse (positive edge trigger) when the CTW is being discharged in the
CK1-CK2 order or simultaneously, the CTW switches from the discharge state to the charge state.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses with the
system logic circuit operating normally.
(6) If no clock pulse is fed to the CK1 or CK2 pin within the watchdog timer monitor time tWD due to some
problem with the system logic circuit, the CTW pin is set to the “L” level threshold voltage VL or less and
the MB3793 outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of VL is always about 0.24 V regardless of the detected voltage.
The watchdog timer monitor time tWD is set with the following equation:
tWD (ms) ≈ B × CTW (μF) + C × CTP (μF)
The value of B is hardly affected by the power supply voltage; it is about 1600 with VCC = 3.0 V to 3.3 V.
The value of C is 0.
For this reason:
tWD (ms) ≈ B × CTW (μF)
Document Number: 002-08559 Rev. *D Page 14 of 23
MB3793-28A
(7) When a certain period of time tWR has passed (until the CTP pin voltage reaches or exceeds Vth again
after recharging the CTP), the MB3793 cancels the reset signal and starts operating the watchdog timer.
The watchdog timer monitor reset time tWR is set with the following equation:
tWR (ms) ≈ D × CTP (μF)
The value of D is 55 with VCC = 3.3 V and about 50 with VCC = 3.0 V.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. If no clock pulse is input,
the MB3793 repeats operations (6) and (7).
(8) If VCC is lowered to the fall-time detected voltage (VSL) or less, the CTP pin voltage decreases and the
MB3793 outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of VSL is 2.80 V (Typ) .
(9) When VCC reaches or exceeds VSH again, the MB3793 starts charging the CTP.
(10) When the CTP pin voltage reaches or exceeds Vth, the MB3793 cancels the reset and restarts operating
the watchdog timer. It repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses.
(11) Making the inhibit pin active (setting the INH pin to “H” from “L”) forces the watchdog timer to stop
operation.
This stops only the watchdog timer, leaving the MB3793 monitoring VCC (operations (8) to (10)).
The watchdog timer remains inactive unless the inhibit input is canceled.
The inhibition (INH) pin must be connecting a voltage of more low impedance, to evade of the noise.
(12) Canceling the inhibit input (setting the INH pin to “L” from “H”) restarts the watchdog timer.
(13) The reset signal is output when the power supply is turned off to set VCC to VSL or less.
1. Equation of time-setting capacitances (CTP and CTW) and set time
tPR [ms] ≈ A × CTP [μF]
tWD [ms] ≈ B × CTW [μF] + C × CTP [μF]
However, when CTP/CTW ≈ 10 or less, tWD [ms] ≈ B× CTW [μF]
tWR [ms] ≈ D × CTP [μF]
Values of A, B, C, and D
Note: The width of value of tPR, tWD and tWR becomes the same ratio as width (Min, Max) of each
specification value.
2. Example (when CTP = 0.1 μF and CTW = 0.01 μF)
A B C D Remark
750 1600 0 55 VCC = 3.3 V
700 1600 0 50 VCC = 3.0 V
time
(ms)
Symbol VCC = 3.3 V VCC = 3.0 V
tPR 75 70
tWD 16 16
tWR 5.5 5
Document Number: 002-08559 Rev. *D Page 15 of 23
MB3793-28A
10. Typical Characteristics
(Continued)
45
40
35
30
25
20
0 1.0 2.0 3.0 4.0
MB3793
VINH VCC
(VINH = 0 V)
2.6
-20-40 0 +20 +40 +60 +80 +100 +120
2.7
2.8
2.9
3.0
3.1
VSH
VSL
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.3
3.2
0
−
1
−
2
−
3
−
4
−
5
−
6
−
7
−
8
−
9
−
10
at V
CC
=
3.3 V
Ta
= +25
°C
Ta
= +85
°C
Ta
= −40
°C
0
100
400
300
200
500
600
012345678910
at VCC = 3.3 V
Ta
= +25 °C
Ta
= +85 °C
Ta
= −40 °C
ICC - VCC characteristics
Power current
ICC (μA)
Power voltage VCC (V)
Watchdog timer monitoring
Detection voltage
VSH and VSL (V)
Operating ambient temperature Ta (°C)
Reset output current I RESET (mA)
Reset output voltage
V RESET (V)
V RESET - I RESET characteristics
(P-MOS side)
V RESET - I RESET characteristics
(N-MOS side)
Reset output voltage
V RESET (V)
Reset output current I RESET(mA)
VSH, VSL - Ta characteristics
fCK= 1 kHz, Duty = 10%
VL = 0 V/VH = VCC
CTW = 0.01 μF, CTP = 0.1 μF
Document Number: 002-08559 Rev. *D Page 16 of 23
MB3793-28A
(Continued)
7
6
5
4
3
2
1
0
01234
Ta = +85 °C
Ta = +25 °C
Ta = -40 °C
-40 -20 0 +20 +40 +60 +80 +100 +120
0
20
40
60
80
100
120
140
160
at VCC = 3.3 V
−40 −20 0 +20 +40 +60 +80 +100 +120
0
2
4
6
8
10
12
14
16
at VCC = 3.3 V
−40 −20 0 +20 +40 +60 +80 +100 +120
0
2
4
6
8
10
12
14
16
18
20
22
24
26
at VCC = 3.3 V
VRESET - VCC characteristics
Power voltage VCC (V)
Reset output voltage
VRESET (V)
Pull-up resistance : 100 kΩ
tPR - Ta characteristics
Operating ambient temperature Ta (°C)
Power-on reset hold time
tPR (ms)
tWR - Ta characteristics tWD - Ta characteristics
Operating ambient temperature Ta (°C) Operating ambient temperature Ta (°C)
Watchdog timer reset time
tWR (ms)
Watchdog timer monitoring time
tWD (ms)
Document Number: 002-08559 Rev. *D Page 17 of 23
MB3793-28A
(Continued)
104
103
102
101
1
10 −1
10−410−310−210−1110
1102
Ta = −40 °C
at VCC = 3.3 V
Ta = +25 °C
Ta = +85 °C
103
102
101
1
10−1
10−410−310−210−1110
2
101
10−2
Ta = −40 °C
at V
CC
= 3.3 V
Ta = +25 °C
Ta = +85 °C
103
102
101
1
10−1
10−410−310−210−1110
1
10−5
Ta = −40 °C
Ta = +25 °C
Ta = +85 °C
at VCC = 3.3 V
tPR - CTP characteristics tWR - CTP characteristics
Power-on reset hold time
tPR (ms)
Power-on reset hold time setting capacitance
CTP (μF)
Power-on reset hold time setting capacitance
CTP (μF)
tWD - CTW characteristics
Watchdog timer monitoring time
tWD (ms)
Watchdog timer monitoring time setting capacitance
CTW (μF)
Watchdog timer reset time
tWR (ms)
Document Number: 002-08559 Rev. *D Page 18 of 23
MB3793-28A
11. Application Example
11.1 Supply Voltage Monitor and Watchdog Timer
11.1.1 1-clock monitor
11.1.2 2-clock monitor
5
2
3
6
4
7
8
1
RESET VCC
RESET
CK
GND
GND
GND
CTW*CTP*
VCC
VCC
CTW
CTP CK1
CK2INH
MB3793
* : Use a capacitor with less leakage current.
Microprocessor
2
3
6
1
8
7
4
5
VCC
CTW*CTP*
GND
INH GND
VCC
CTP
CTW RESET
CK1
CK2
RESET
CK
GND
VCC RESET
CK
GND
VCC
MB3793
* : Use a capacitor with less leakage current.
Microprocessor1 Microprocessor2
Document Number: 002-08559 Rev. *D Page 19 of 23
MB3793-28A
11.2 Supply Voltage Monitor and Watchdog Timer Stop
11.3 Setting of Compulsory Reset
GND
CTW*CTP*
VCC
RESET VCC
CK
GND
RESET VCC
CK
GND
HALT
HALT
5
2
3
6
4
7
8
1
RESET
GND
VCC
INH
CTW
CK1
CK2
CTP
MB3793
* : Use a capacitor with less leakage current.
Microprocessor1 Microprocessor2
5
2
3
6
4
7
8
1
RESET VCC
RESET
CK
GND
GND
GND
CTW
*CTP
*
RESIN
10 kΩ
VCC
VCC
CTW
CTP CK1
CK2INH
MB3793
* : Use a capacitor with less leakage current.
It is possible for the RESET pin to fix to “L” if the CTP pin is short-circuited to GND.
Take care not to change the value of the CTP capacity because of the influence of Tr that
is used at the time.
Microprocessor
Document Number: 002-08559 Rev. *D Page 20 of 23
MB3793-28A
12. Usage Precaution
1. Do not Configure the IC Over the Maximum Ratings
If the lC is used over the maximum ratings, the LSl may be permanently damaged.
It is preferable for the device to normally operate within the recommended usage conditions. Usage outside of these
conditions can have a bad effect on the reliability of the LSI.
2. Use the Devices within Recommended Operating Conditions
The recommended operating conditions are under which the LSl is guaranteed to operate.
The electrical ratings are guaranteed when the device is used within the recommended operating conditions and
under the conditions stated for each item.
3. Printed Circuit Board Ground Lines Should be Set up with Consideration for Common Impedance
4. Take Appropriate Measures Against Static Electricity
• Containers for semiconductor materials should have anti-static protection or be made of conductive material.
• After mounting, printed circuit boards should be stored and shipped in conductive bags or containers.
• Work platforms, tools, and instruments should be properly grounded.
• Working personnel should be grounded with resistance of 250 kΩ to 1 MΩ between body and ground.
5. Do not Apply Negative Voltages
The use of negative voltages below –0.3 V may create parasitic transistors on LSI lines, which can cause
malfunctions.
13. Ordering Information
14. RoHS Compliance Information of Lead (Pb) Free version
The LSI products of Fujitsu Microelectronics with “E1” are compliant with RoHS Directive , and has observed the standard of lead,
cadmium, mercury, Hexavalent chromium, polybrominated biphenyls (PBB) , and polybrominated diphenyl ethers (PBDE) .
The product that conforms to this standard is added “E1” at the end of the part number.
Part Number Package Remarks
MB3793-28APNF 8-pin plastic SOP
(SOB008) –
Document Number: 002-08559 Rev. *D Page 21 of 23
MB3793-28A
15. Package Dimensions
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127(6
L11.05 REF
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1.40
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1.75
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b0.36 0.44 0.52
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DIMENSIONS
L20.25 BSC
h0.40 BSC.
11. JEDEC SPECIFICATION NO. REF : N/A
D
4
5
E1 E
0.20 CA-B D
AA2
A1
10
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SEATING
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0.25 H D
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INDEX AREA
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BOTTOM VIEW
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Package Code: SOB008
002-15856 Rev. **
Document Number: 002-08559 Rev. *D Page 22 of 23
MB3793-28A
16. Document History
Document Title: MB3793-28A Power-Voltage Monitoring IC with Watchdog Timer Datasheet
Document Number: 002-08559
Revision ECN Orig. of
Change
Submission
Date Description of Change
** −TAOA 12/03/2009 Migrated to Cypress and assigned document number 002-08559.
No change to document contents or format.
*A 5186892 TAOA 03/31/2016 Updated to Cypress template
*B 5606220 HIXT 02/07/2017
Updated Pin Assignment: Change the package name from FPT-8P-M01 to SOE008
Updated Ordering Information: Change the package name from FPT-8P-M01 to SOE008
Updated Package Dimensions: Updated to Cypress format
Deleted “Marking Format (Lead Free version)”
Deleted “Labeling Sample (Lead free version)”
Deleted “MB3793-28APNF Recommended Conditions of Moisture Sensitivity Level”
*C 5782377 MASG 06/22/2017 Adapted Cypress new logo.
*D 6459753 SSAS 01/25/2019 Obsoleted.
Document Number: 002-08559 Rev. *D Revised January 25, 2019 Page 23 of 23
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