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PDF M5295AFP Data sheet ( Hoja de datos )
| Número de pieza | M5295AFP | |
| Descripción | Watchdog Timer | |
| Fabricantes | Renesas | |
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M5295AL/AP/AFP
Watchdog Timer
REJ03D0780-0200
Rev.2.00
Jun 15, 2007
Description
M5295A is a semiconductor integrated circuit which is designed for system reset to detect +5 V power supply.
This IC keeps the operation microcomputer watching. When the system is abnormal, it generates reset output until the
system returns to normal states of the system.
It is possible to vary the two detective voltage by connecting the resistor, so it is suitable to high quality and high
performance system.
Features
• Watchdog timer
• Power on reset timer
• Low circuit current: 0.8 mA (Typ, VCC = 5 V)
• Wide supply voltage range: VCC(max) = 15 V
Application
• Microcomputer system
Recommended Operating Condition
• Supply voltage range: 4 V to 15 V
• Rated supply voltage: 5 V
Block Diagram
F.F
F.F
–
+
–
+
W.D.T
F.F
49.6k
–
+
20.4k
51.2k
+
–
18.8k
1.24V
Reference voltage
generator circuit
20k 30k
1
WD
2
TC
3
RST1
4
GND
5
ADJ1
678
VCC
RST2
ADJ2
REJ03D0780-0200 Rev.2.00 Jun 15, 2007
Page 1 of 12
1 page  
M5295AL/AP/AFP
1. Pin(2) (TC pin) charge time and discharge time
When input to WD pin is abnormal, TC pin output waveform is as shown below:
TC
0V
tWD
4
5
⋅ VCC
2
5
⋅ VCC
tRST(1)
tRST(2)
tRST(1) = 0.51 ⋅ C ⋅ R1
tWD = 1.1 ⋅ C ⋅ R1 (charge time)
4 ⋅ R1 – 1
tRST(2) = 1000 ⋅ C ⋅ ln
1000
2 ⋅ R1 – 3
(discharge time)
1000
VCC
R1
2
C
Resistance R1: 10kΩ ≤ R1 ≤ 30kΩ
When R1 is 10kΩ, tRST(2) is 830 ⋅ C
Figure 2
2. Pin (1) (WD pin) input frequency, input pulse width, charge time and discharge time
When input to WD pin is normal, TC pin output waveform is as shown below:
Pin (2) xV
t1 t2
(VCC = 5V)
4V
2V
Input
tWDIN
t1 = C ⋅ R1 ⋅ ln
3
5–x
( R1 + 1) x – 5
t2 = 1000 ⋅ C ⋅ ln
1000
2 ⋅ R1 – 3
1000
Figure 3
(charge time)
(discharge time)
REJ03D0780-0200 Rev.2.00 Jun 15, 2007
Page 5 of 12
5 Page 
M5295AL/AP/AFP
Package Dimensions
JEITA Package Code
P-SIP8-6.4x19-2.54
RENESAS Code
PRSS0008AA-A
Previous Code
8P5
MASS[Typ.]
0.73g
19.0 ±0.2
2.8 ±0.2
2.54
0.5 ±0.1
1.2
+0.1
-0.3
0.85
+0.3
-0.1
0.27
+0.07
-0.05
1.2 ±0.1
JEITA Package Code
P-DIP8-6.3x8.84-2.54
RENESAS Code
PRDP0008AA-A
Previous Code
8P4
MASS[Typ.]
0.5g
85
1
*2
D
4
*3 b3
bp
e
SEATING PLANE
*3 b2
REJ03D0780-0200 Rev.2.00 Jun 15, 2007
Page 11 of 12
NOTE)
1. DIMENSIONS "*1" AND "*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION "*3" DOES NOT
INCLUDE TRIM OFFSET.
Reference Dimension in Millimeters
Symbol Min Nom Max
e1 7.32 7.62 7.92
D 8.7 8.9 9.1
E 6.15 6.3 6.45
A 4.5
A1 0.51
A2 3.3
bp 0.4 0.5 0.6
b2 0.9 1.0 1.3
b3 1.4 1.5 1.8
c 0.22 0.27 0.34
0° 15°
e 2.29 2.54 2.79
L 3.0
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet M5295AFP.PDF ] | |
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