Hitachi HA16117FPC Cmos watchdog timer Datasheet

HA16117F Series
CMOS Watchdog Timer
Description
The HA16117F Series of ICs make a micro-processor (MPU) system fail-safe by monitoring its power
supply to detect voltage drops, and monitoring a P-RUN (program running) pulse to detect system crashes.
Also referred to as watchdog timers, these devices are essential in systems that aim for high levels of crash
protection. Fabricated by a CMOS process, they consume little power and are ideally suited for batteryoperated systems.
These ICs are available in versions for industrial and communications equipment and automotive
applications, as well as for consumer products.
Functions
• Power-on reset
 Sends a RES signal to the MPU for a fixed time at power-on
• Watchdog timer (WDT)
 Monitors a P-RUN signal from the MPU and sends the MPU a RES signal if P-RUN departs from a
set frequency range
• Auto-reset
 Outputs RES signals to the MPU at clocked intervals while P-RUN remains abnormal
• Supply voltage supervision
 Outputs a low RES signal if the supply voltage (same as the MPU's VCC) falls below a low threshold
level (VTL). The threshold differs for different ICs in the series, allowing designers to choose an IC
matching system requirements (see ordering information)
Features
• Low power consumption : Operating (ACC pin low) = 0.5 mW (Typ)
: Standby (ACC pin high) = 0.2 mW (Typ)
• Watchdog timer on/off control by ACC input signal
• Independent auto-reset high and low times (tRH and tRL)
• Watchdog monitoring by frequency filtering (independent of duty cycle)
• High-precision low voltage detection (±2%)
• Space- and weight-saving 8-pin SOP package
HA16117F Series
Ordering Information
The HA16117F Series includes three ICs with different low threshold levels (VTL).
Type No.
Low Threshold Voltage (VTL)
HA16117FPA/FPAJ
4.4 V Typ
HA16117FPB/FPBJ
4.2 V Typ
HA16117FPC/FPCJ
4.0 V Typ
Pin Arrangement
VCC
P-RUN
CF
CR
1
2
3
4
8
7
6
5
Tadj
ACC
GND
RES
(Top view)
Pin Description
Pin No.
Symbol
Function
1
VCC
Power supply voltage input
2
P-RUN
Watchdog timer (WDT) input
3
CF
Connected capacitor C F determines WDT filter characteristic
(normal frequency range)
4
CR
Connected capacitor C R determines tON for power-on reset and tOFF, t RH,
and tRL for auto-reset
5
RES
Reset signal output from WDT and voltage supervision circuits
6
GND
Ground
7
ACC
WDT on/off control input (on when ACC is low)
8
Tadj *
For adjusting tRH and tOFF (divide V CC to get the adjustment voltage)
Note: The low-voltage threshold cannot be modified by changing the external resistors connected to the
Tadj pin.
2
HA16117F Series
Block Diagram
VCC
5V
6
1
2.52 (117FA)
2.36 (117FB)
2.20 (117FC)
GND
1
Low voltage detector
−
+
≈1.25 V
COMP.
GND
RES
0.1 µ
4
CR
5
I1
Power-on and auto-reset circuit
(*I1 < I2)
−
+
SW2
I2 adjustment
R1
510 k
8
Tadj
R2
750 k
SW1
I2
(SW1 and SW2 are active high)
Watchdog timer
Watchdog filter (f-duty converter)
W.D out
duty (%)
2
to Microcomputer
COMP.
P-RUN
1/2 frequency W.D in
divider
duty 50%
Normal range
n
W.D out
fL/2
fH/2
duty n%
W.D in frequency (Hz)
3
PULSE from I/O port
CF
0.01 µ
Mode
ACC Voltage
Operating
Low
Function
Low voltage detection and WDT
Standby
High
Low voltage detection
7
ACC
Operating: "Low"
Standby: "High"
Note: The power-on reset circuit operates in both operating and standby modes.
The HA16117F consists of a low voltage detector, power-on and auto-reset circuit, and watchdog timer.
Low Voltage Detector
Uses a reference voltage source (≈ 1.25 V) and high-precision comparator to detect drops in the supply
voltage.
Power-On and Auto-Reset Circuit
Generates the RES waveform, using a multivibrator consisting of a current source I1 that charges the
external capacitor C R, a current source I 2 that discharges CR, and a comparator.
3
HA16117F Series
Watchdog Timer
Reshapes the P-RUN signal (programming-running pulse) from the MPU to obtain a 50% duty cycle, then
converts frequency to duty cycle in the watchdog filter (WD filter).
The watchdog filter is a bandpass filter. The duty cycle of the filter output is highest in the normal
frequency range of P-RUN.
The watchdog filter output controls I2 in the multivibrator, the higher the duty cycle of the watchdog filter
output, the shorter the time during which I2 discharges CR. If the duty cycle is high enough then CR is held
at a high potential, preventing the multivibrator from firing, and the RES output remains high.
Absolute Maximum Ratings (Ta = 25°C)
Ratings
Item
Symbol
HA16117FPA/FPB/FPC
HA16117FPAJ/FPBJ/FPCJ
Unit
Power supply voltage
VCC
–0.3 to +14
–0.3 to +14
V
P-RUN input voltage
VP
VCC
VCC
V
ACC input voltage
VACC
14
14
V
I RES
10
10
mA
PT
300
300
mW
Operating temperature range
Topr
–30 to +85
–40 to +85
°C
Storage temperature
Tstg
–55 to +125
–55 to +125
°C
RES output current
Permissible dissipation *
Note:
1
1. This is the value when mounted on a glass epoxy substrate with 30% wiring density, up to an
ambient temperature of 83°C. Above that temperature, derate by 7.14 mW/°C.
Permissible dissipation PT (mW)
40mm
4
Substrate
0.8 mm ceramic or
1.5 mm epoxy
400
300
200
83°C
−7.14 mW/°C
(30% wiring density)
100
85°C
0
−30 −20 0 20 40 60 80 100
Ambient operating temperature range Ta (°C)
HA16117F Series
Electrical Characteristics
(VCC = 5 V, Ta = 25°C, CF = 0.01 µF, CR = 0.1 µF, R1 = 510 kΩ, R2 = 750 kΩ)
Item
General
Symbol
Min
Typ
Max
Unit
Test Conditions
ICC1
—
100
—
µA
VACC = 0 V,
fP-RUN = 100 Hz
ICC2
—
200
600
µA
VACC = 0 V,
fP-RUN = 20 kHz
Standby supply current
ISTBY
—
43
100
µA
VACC = 12 V
Low voltage
threshold
level
VTL
4.3
4.4
4.5
V
When VCC drops
HA16117FPB/FPBJ
4.1
4.2
4.3
V
HA16117FPC/FPCJ
3.9
4.0
4.1
V
Operating supply current
Low
voltage
detector
HA16117FPA/FPAJ
Hysteresis width
VHYS
50
100
150
mV
Low input voltage
VIL1
—
—
0.8
V
High input voltage
VIH1
2.0
—
—
V
P-RUN
Low input voltage
VIL2
—
—
0.8
V
input
High input voltage
VIH2
2.0
—
—
V
WDT
Power-on reset time
tON
24
40
56
ms
Reset-clock off time
tOFF *1
78
130
182
ms
Reset low time
tRL
12
20
28
ms
Reset high time
tRH
36
60
84
ms
Low setup time
tSL
1
—
—
ms
High setup time
tSH
—
—
1
ms
RES
RES low voltage
VOL
—
—
0.4
V
IOL = 1 mA
output
RES high voltage
VOH
—
VCC
—
V
Open
Reset function starting voltage
VRES
—
0.8
1.4
V
Constant range of R 1 and R 2
K
0.55
0.6
0.8
—
VCCRNG
VTL
—
6.0
V
ACC
Constant
range
Operating supply voltage range
Note:
P-RUN pin = 0 V
K =R2 / (R1 + R2)
1. Reset-clock off time tOFF is provided a shown in the under figure.
f = 500 Hz, Duty = 50%
P-RUN
RES
tOFF
5
HA16117F Series
Timing Waveforms and Functional Description
VTL
VCC
P-RUN
Crash
t RH
Watchdog function on
RES
(VACC = "Low")
t ON
t OFF
t ON
t RL
Watchdog function off
RES
(VACC = "High")
t ON
t ON
Figure 1 Timing Waveforms
Watchdog On/Off Function
A feature of the HA16117F is that watchdog supervision can be switched on and off. When the watchdog
function is switched on, both the supply voltage and
P-RUN input are monitored to detect abnormal conditions. When the watchdog function is switched off
(standby mode), only the supply voltage is monitored. Watchdog supervision is switched on and off by the
input at the ACC pin (pin 7): Supervision is on when ACC is low, and off when ACC is high.
Many MPUs have a standby mode in which the CPU stops running but memory contents are retained. In
standby mode, program execution halts and I/O ports go to the high-impedance state, so there is no need for
the watchdog timer to supervise pulse output from an I/O port to detect abnormal conditions. Power can be
saved by placing both the MPU and HA16117F in standby mode at the same time. The HA16117F is
designed to draw a typical standby current I STBY of only 43 µA Typ when the watchdog function is switched
off.
ACC Pin (pin 7) and RES Output
When the MPU returns from standby mode to normal operation it generally takes 10 to 200 ms for the
clock oscillator in the MPU to stabilize. The RES signal is not output during this setup time. After the
setup time (tSL) has elapsed, RES is output if the P-RUN signal from the MPU is still abnormal.
Adjust according to
MPU’s setup time
ACC pin
t SH
t SL
RES (due to MPU crash)
Figure 2 ACC Pin and RES Output
6
HA16117F Series
Internal Operation and Usage Notes
Figure 3 shows an equivalent circuit of the watchdog timer block with a VCC pin level of 5 V and ACC pin
level of 0 V, and the following pages show internal operation timing charts for different P-RUN
frequencies. (Descriptions apply to conditions CF = 0.01 µF, CR = 0.1 µF, R2/(R1 + R2) = 0.6.)
Operation
The power-on and auto-reset circuit is a multivibrator with timing controlled by CR charge current I 1 and
discharge current I2. As I1 : I2 ≈ 3 : 1 (Typ design value), when the (WD) (watchdog filter circuit output)
on-duty is 25% or above, the C R pin potential does not fall below 1.6 V. Therefore, (C) in the figure below
is fixed low, and RES is not output. The (WD) on-duty varies according to the P-RUN frequency. If the
frequency is lower or higher than the design value, the (WD) on-duty decreases, and at 25% or below, RES
is output. Refer to the timing charts on the following pages for an explanation of the operation of the
watchdog filter.
Usage Notes
• When the P-RUN frequency reaches 20 kHz or above, tOFF is short (see the timing charts on the
following pages). This must be borne in mind in the design stage.
• If the P-RUN frequency fluctuates, RES may also be output within the normal detection set frequency
(see the timing charts on the following pages).
• Detection frequencies fH and fL described in the Data Book are Typ values, and a certain amount of
dispersion can be expected. A margin of ±30% or more should be allowed for in the design.
0.1 µ
A
VCC (5 V)
I1
8 µ typ
Iw
0.8 µ
typ
3.6 V
−
+
−
+
Q
0.01 µ
0.9 V
−
+
WD
D Q
C
RES
3.2 V
1.6 V
CF
P-RUN
Low voltage detection block
CR
B
I2
10.7 µ
typ
φ Q
Q
1/2
frequency divider
Watchdog filter circuit
Power-on and auto-reset circuit
Figure 3 Watchdog Timer Evaliation Circuit
7
HA16117F Series
1. When P-RUN signal is not input
The watchdog filter circuit output (WD) is fixed low, so the RES signal is output as shown in
the figure below in accordance with power-on and auto-reset circuit CR charge/discharge.
H
P-RUN
L
H
Q
L
H
Q
L
H
A
L
5V
3.6 V
CF
0.9 V
0V
H
WD
L
5V
3.2 V
CR
1.6 V
0V
H
B
L
H
C
L
H
RES
L
20 ms
8
60 ms
HA16117F Series
2. With a low-frequency P-RUN signal ( 13 Hz to 26 Hz)
When fP-RUN is 13 Hz to 26 Hz, the WD duty (D = 100 × t2/2T) is 25% to 50%. When the WD
duty is 25% or above, multivibrator (power-on and auto-reset circuit) oscillation stops. As a
result, the RES signal is fixed high.
40 ms (25 Hz)
H
P-RUN
L
H
Q
L
2T
H
Q
L
H
A
L
5V
3.6 V
CF
0.9 V
0V
t1 5 µs
H
WD
t2
33 ms
L
5V
3.2 V
CR
1.6 V
0V
H
B
L
H
C
L
H
60 ms
RES
L
20 ms
9
HA16117F Series
3. With a 10 kHz P-RUN signal
When fP-RUN is 10 kHz, the WD duty (D = 100 × (T − t2)/2T) is 48%. As the duty is above
25%, the multivibrator (power-on and auto-reset circuit) does not oscillate. The RES signal
remains high.
100 µs (10 kHz)
H
P-RUN
L
H
Q
L
2T
H
Q
L
H
A
L
5V
3.6 V
CF
0.9 V
0V
H
WD
L
5V
3.2 V
CR
1.6 V
0V
H
B
L
H
C
L
H
RES
L
10
t1 5 µs
HA16117F Series
4. With a 150 kHz P-RUN signal
When fP-RUN is 100 kHz or above, the WD duty (D = 100 × (T − t2)/2T) is 25% or below.
Therefore, CR is discharged, and the RES signal is output at the instant that the pin potential
falls to the comparator circuit threshold value (VTL = 1.6 V).
6.6 µs (150 kHz)
H
P-RUN
L
H
Q
L
H
2T
Q
L
H
A
L
5V
t1 5 µs
3.6 V
CF
0.9 V
0V
H
WD
L
5V
3.2 V
CR
1.6 V
0V
H
B
L
H
C
L
H
RES
L
11
HA16117F Series
5. tOFF when P-RUN signal 90 kHz
When the P-RUN frequency is high, even though within specification, the CR pin potential
falls. If the P-RUN frequency falls sharply at this time, tOFF may be short.
With values of CF = 0.01 µF and CR = 0.1 µF, the CR pin potential will not fall as long as the
P-RUN frequency is 20 kHz or below.
H
fP_RUN ≈ 90 kHz
50 ms
P-RUN
L
H
Q
L
H
Q
L
H
A
L
5V
3.6 V
CF
0.9 V
0V
H
WD
L
5V
3.2 V
≈ 2.3 V
CR
1.6 V
0V
H
B
L
H
C
L
H
RES
L
tOFF
26 ms
12
HA16117F Series
6. When P-RUN frequency fluctuates (1)
If there is a double-pulse in P-RUN, the WD filter duty will be decreased and RES will be
output, as shown in the figure below, for example. In this case, the condition for non-output of
the RES signal is a value of 3 or less for the ratio of P-RUN pulse interval minimum value to
maximum value (when fP-RUN ≤ 20 kHz). This is because the CR pin charge/discharge current
ratio is 3.
2 ms
H
28 ms
P-RUN
L
H
Q
L
H
Q
L
H
A
L
5V
3.6 V
CF
0.9 V
0V
H
WD
L
5V
3.2 V
CR
1.6 V
0V
H
B
L
H
C
L
H
RES
L
20 ms
13
HA16117F Series
7. When P-RUN frequency fluctuates (2)
If there is a double-pulse in P-RUN, RES will not be output as long as the ratio of P-RUN
pulse interval minimum value to maximum value is 3 or less. The timing chart for a P-RUN
minimum interval of 8 ms and maximum interval of 22 ms is shown below.
8 ms
H
P-RUN
L
H
Q
L
H
Q
L
H
A
L
5V
3.6 V
CF
0.9 V
0V
H
WD
L
5V
3.2 V
CR
1.6 V
0V
H
B
L
H
C
L
H
RES
L
14
22 ms
HA16117F Series
8. Summary of cases where P-RUN frequency fluctuates
If there is a double-pulse in P-RUN, RES may be output if the double-pulse has multiple frequency
components. If the P-RUN frequency fluctuates, refer to the following when making the P-RUN
setting.
• P-RUN normal detection region, duty dependency
1M
Note: 1
When fP-RUN ≥ 20 kHz,
tOFF is frequency-dependent,
so care is required when
making the P-RUN setting
(see figure below).
P-RUN frequency fP-RUN (Hz)
100 k
10 k
1k
Normal detection region*2
100
10
1
0
50
100
P-RUN pulse duty D (%)
Note: 2. This is the region when fP-RUN is constant.
If fP-RUN fluctuates within the normal detection region, the following applies:
Normal detection is performed when the condition fP-RUN H/fP-RUN L < M is satisfied.
CR voltage VCR (V)
• fP-RUN dependency of VCR, tOFF, M
5
tOFF
(s)
4
100 m
3
50 m
3
2 M
2
Multivibrator threshold voltage (1.6 V)
0
1
1
0
1k
3k
5 k 7 k 10 k
30 k
50 k 70 k 100 k
P-RUN frequency (Hz)
15
HA16117F Series
Setting of RES Timing and Watchdog Frequency Range
Different MPUs have different RES timing requirements. The minimum reset time (tON ) required at poweron (rise of VCC) is 20 ms for some MPUs and 100 ms for others.
RES timing waveform parameters must be selected according to the MPU. With the HA16117F the timing
of the RES output and the watchdog frequency range can both be set by external constants (CF, CR, and K).
Parameters
Item
Symbol
CR (pin 4)
Power-on reset time
t ON
●
Reset-clock off time
t OFF
●
Reset low time
t RL
●
Reset high time
t RH
●
Watchdog frequency high
fH
Watchdog frequency low
fL
CF (pin 3)
K (pin 8) *1
▲ *2
●
●
●
●
●
●
●
Notes: 1. K = R2 / (R1 + R2)
2. Variability of tOFF increases with increasing CF. The variability ∆t OFF is approximately
3.3 (MΩ) × CF (µF), so CF ≤ 0.01 (µF) is recommended.
3. External constants should be selected with reference to the formulas in tables 1 and 2.
Table 1
Calculation of RES Output Timing
Item
Formula
Notes
t ON (ms)
400 (Ω) × CR (µF)
t ON and t OFF can be set independently
t OFF (ms)
1.99 × tRH (ms)
t RL (ms)
0.5 × tON (ms)
t RH (ms)
1.6 (V)
× CR (µF) × 103
K × 31 (µA) − 15.8 (µA)
t SL (ms)
≈ tOFF (ms)
Table 2
Calculation of Watchdog Frequency Range
Item
Formula
f H (MHz)
1
tRH (ms) − tRL (ms)
×
500 (Ω) × CF (µF)
tRH (ms) + tRL (ms)
f L (Hz)
1
tRL (ms)
×
1.7 (MΩ) × CF (µF)
tRH (ms) + tRL (ms)
Whichever is larger
16
t RL and tRH can be set independently
or
1
3
× 10
tOFF (ms)
HA16117F Series
Selection of External Constants
If the reset duration necessary for the MPU to operate reliably at power-on is known, there is a simple
procedure for selecting external constants, starting from the power-on reset time (tON).
START
Set power-on
reset time tON
Set reset high
time tRH
• Decide reset
low time (tRL)
• Select external
constant CR
Select external
constant CF
External
constant
Check watchdog values
frequency range
fH and fL
• Decide reset-clock
off time (tOFF)
• Select external
constants R1 and R2
Figure 4 Procedure for Selecting External Constants
Application Example
SW
R1
510 kΩ
Battery
5V
regulator
CF
0.01 µF
CR
0.1 µF
VCC
Tadj
P-RUN
ACC
HA16117F
CF
GND
CR
R2
750 kΩ
VCC
Microprocessor
system
RES
PORT
GND
RES
17
HA16117F Series
Operating Characteristics and Test Circuits
510 k
5V
VTL
5V
0V
VCC
VCC
Tadj
750 k
P-RUN ACC
0V
tON
5V
0.01 µ
CF
GND
CR
RES
0.1 µ
Oscilloscope
RES
Circuit for measuring tON
0V
50 ms/div
time
Power-on reset time (tON)
5V
5V
0V
f = 500Hz
duty 50%
SW,OFF
5V
510 k
VCC
P-RUN
Tadj
750 k
P-RUN ACC
50‰
0V
5V
tOFF
RES
0.01 µ
CF
GND
CR
RES
0.1 µ
Oscilloscope
0V
50 ms/div
Circuit for measuring tOFF
time
Reset-clock off time (tOFF)
tRH
510 k
5V
VCC
RES
P-RUN ACC
CR
0.01 µ
0V
GND
CR
RES
0.1 µ
Oscilloscope
time
RES and CR waveforms at detect abnormal conditions
18
CF
Oscilloscope
tRL
20 ms/div
Tadj
750 k
5V
Circuit for measuring RES and CR waveforms
HA16117F Series
Low Voltage Threshold vs. Ambient Temperature
5.0
12 V
Low voltage threshold VTL (V)
HA16117FA
VTL -Ta
510 k
VCC
4.5
VCC
P-RUN ACC
(−50ppm/°C)
0.01 µ
4.0
Tadj
0.1 µ
CF
GND
CR
RES
750 k
5V
regulator
Oscilloscope
3.5
−30
0
50
85
Ambient temperature Ta (°C)
Test circuit
Threshold Hysteresis Width vs. Ambient Temperature
Threshold hysteresis width VHYS (mV)
150
12V
HA16117FA
VHYS -Ta
510k
VCC
100
VCC
0.01
50
Tadj
P-RUN ACC
CF
GND
CR
RES
750k
5V
regulator
0.1
Oscilloscope
0
−30
0
50
Ambient temperature Ta (°C)
85
Test circuit
19
HA16117F Series
Operating Supply Current vs. P-RUN Input Frequency
500 µ
Operating supply current ICC (A)
Ta = 25°C
100 µ
10 µ
100
1k
10 k
P-RUN input frequency fP-RUN (Hz)
A
ICC
510 k
VCC pin
5V
Pulse genelator
0.01 µ
VCC
0 V to 5 V
Tadj
P-RUN ACC
CF
GND
CR
RES
0.1 µ
Test circuit
20
750 k
20 k
HA16117F Series
Standby Supply Current vs. Supply Voltage
200 µ
Ta = 25°C
VCC
ISTBY
V
VCC
Tadj
510 k
750 k
P-RUN ACC
100 µ
12 V
0.01 µ
CF
GND
CR
RES
0.1 µ
Test circuit
0
5
7
Supply Voltage VCC (V)
Supply Current vs. Ambient Temperature
300 µ
Supply current ISTBY, ICC (A)
Standby supply current ISTBY (A)
A
f = 20 kHz ICC
200 µ
100 µ
f = 100 Hz ICC
ISTBY
0
−30
0
50
85
Ambient temperature Ta (°C)
21
HA16117F Series
RES Low Voltage vs. RES pin Sink Current
RES low voltage VOL (V)
0.4
VCC
0.3
5V
P-RUN ACC
)
0Ω
0.2
N
6
≈1
(R O
Tadj
CF
GND
CR
RES
0.01 µ
V
0.1
Test circuit
0
0.5 m
1m
1.5 m
RES pin sink current IOL (A)
RES Low Voltage vs. Ambient Temperature
RES low voltage VOL (V)
0.3
IOL = 1mA
0.2
0.1
0
−30
0
50
Ambient temperature Ta (°C)
22
51 k
75 k
85
Io sink
HA16117F Series
RES High Voltage vs. RES pin Source Current
5
RES high voltage VOH (V)
Ta = 25°C
VCC
5V
Tadj
P-RUN ACC
4
0.01 µ
51 k
75 k
CF
GND
CR
RES
0.1 µ
V
Io sink
Test circuit
3
0
500 µ
RES pin source current Io source (A)
23
HA16117F Series
Power-on Reset Time vs. CR Capacitance
1
Ta = 25°C
Power-on reset time tON (sec)
VCC
5V
Tadj
510 k
750 k
P-RUN ACC
100 m
0.01 µ
CF
GND
CR
RES
CR
Oscilloscope
10 m
VCC
RES
tON
Test circuit
1m
0.01 µ
0.1 µ
1.0 µ
External capacitance CR (F)
RES Output Timing vs. CR Capacitance
1
RES output timing tRH, tRL (sec)
Ta = 25°C
VCC
100 m
tRH
5V
0.01 µ
tRL
Tadj
P-RUN ACC
CF
GND
CR
RES
CR
10 m
Oscilloscope
tRH
RES
1m
0.01 µ
0.1 µ
External capacitance CR (F)
24
510 k
750 k
5V
0V
1.0 µ
Test circuit
HA16117F Series
High Setup Time vs. CR Capacitance
1000 µ
High setup time tSH (sec)
Ta = 25°C
100 µ
VCC
5V
10 µ
0.01 µ
510 k
750 k
Tadj
P-RUN ACC
CF
GND
CR
RES
0V
CR
RES
tSH
Oscilloscope
Test circuit
1µ
0.01 µ
0.1 µ
1.0 µ
External Capacitance CR (F)
Low Setup Time vs. CR Capacitance
10
Ta = 25°C
VCC
Low setup time tSL (sec)
5V
P-RUN ACC
1
0.01 µ
Tadj
510 k
750 k
CF
GND
CR
RES
CR
Oscilloscope
100 m
15 V
0V
RES
10 m
0.01 µ
0.1 µ
tSL
1.0 µ
External Capacitance CR (F)
Test circuit
25
HA16117F Series
Reset High Time vs. K (Tadj Constant)
Reset high time tRH (sec)
100 m
VCC
5V
0.01 µ
10 m
0.56
0.6
0.7
R1
R2
Tadj
P-RUN ACC
CF
GND
CR
RES
0.1 µ
0.8
Oscilloscope
Tadj constant K
K=
Test circuit
R2
R1 + R2
Duty-cycle dependence of
P-RUN normal frequency range
1M
MPU system abnormal
P-RUN input frequency fP-RUN (Hz)
100 k
5V
Abnormal if duty
cycle is 0%
VCC
10 k
Pulse
generator
1k
0V
Abnormal if duty
cycle is 100%
100
P-RUN ACC
5V
MPU system normal
0.01 µ
Tadj
510 R
750 R
CF
GND
CR
RES
0.1 µ
Oscilloscope
Test circuit
10
MPU system abnormal
1
0
50
100
P-RUN input pulse duty cycle (%)
26
Notes: 1. Normal detection is assumed when RES is not output.
2. The figure at left is for a constant P-RUN frequency.
See "8. Summary of cases where P-RUN frequency
fluctuates" for cases where the frequency fluctuates.
HA16117F Series
P-RUN Input Frequency vs. K (Tadj constant)
1M
Ta = 25°C
R2
R1 + R2
K=
P-RUN input frequency fP-RUN (Hz)
R1
R2
5V
100 k
VCC
Pulse
generator
10 k
Tadj
P-RUN ACC
5V
0V
CF
GND
CR
RES
duty 50%
1k
MPU system normal
0.01 µ
0.1 µ
Oscilloscope
100
K=
R2
R1 + R2
Test circuit
10
MPU system abnormal
1
0.55 0.6
0.7
Tadj constant K
Notes: 1. Normal detection is assumed when RES is not output.
2. The figure at left is for a constant P-RUN frequency.
0.8
P-RUN High Threshold Frequency vs. CF Capacitance
10 M
Ta = 25°C
P-RUN high threshold frequency fH (Hz)
510 k
VCC
5V
Tadj
P-RUN ACC
750 k
MPU system abnormal
1M
Pulse
generator
CF
CF
GND
CR
RES
CR
Oscilloscope
100 k
0 V to 5 V duty 50%
Test circuit
MPU system normal
Notes: 1. Normal detection is assumed when RES is not output.
10 k
500 p 1000 p
2. The figure at left is for a constant P-RUN frequency.
0.01 µ 0.03 µ
External capacitance CF (F)
27
HA16117F Series
P-RUN Low Threshold Frequency vs. CF Capacitance
1k
P-RUN low threshold frequency fL (Hz)
Ta = 25°C
VCC
Normal
P-RUN ACC
5V
CR = 0.01 µF
100
Tadj
51 k
75 k
CF
GND
CR
RES
Pulse
generator
CR = 0.1 µF
Abnormal
CF
10
Oscilloscope
CR
Test circuit
CR = 1.0 µF
Notes: 1. Normal detection is assumed when RES is not output.
1
500 p 1000 p
2. The figure at left is for a constant P-RUN frequency.
0.01 µ 0.03 µ
External Capacitance CF (F)
P-RUN Input Frequency vs. Ambient Temperature
1M
P-RUN abnormal
VCC
P-RUN input frequency fP-RUN (Hz)
100 k
10 k
duty 50%
CF
GND
CR
RES
Pulse
generator
P-RUN normal
Oscilloscope
100
0.01 µ
fL
0.1 µ
Test circuit
10
P-RUN abnormal
1
−30
0
50
Notes: 1. Normal detection is assumed when RES is not output.
85
Ambient temperature Ta (°C)
28
P-RUN ACC
5V
fH
1k
Tadj
510 k
750 k
2. The figure at left is for a constant P-RUN frequency.
HA16117F Series
Power-on reset time tON (ms)
Power-on Reset Time vs. Ambient Temperature
100
VCC
5V
Tadj
510 k
750 k
P-RUN ACC
CF
GND
CR
RES
50
tON
0.01 µ
CR
Oscilloscope
0
−30
0
50
100
VCC
Ambient temperature Ta (°C)
RES
Power-on Reset Time vs. Ambient Temperature
tON
Test circuit
tRH and tRL vs. Ambient Temperature
100
VCC
5V
70
P-RUN ACC
tRH and tRL (ms)
tRH
50
0.01 µ
Tadj
51 k
75 k
CF
GND
CR
RES
0.1 µ
Oscilloscope
30
tRH
tRL
5V
0V
0
−35
0
50
85
tRL
Test circuit
Ambient temperature Ta (°C)
29
HA16117F Series
Package Dimensions
Unit: mm
4.85
4.4
5.25 Max
5
8
1
0.75 Max
*0.22 ± 0.05
0.20 ± 0.04
2.03 Max
4
0.25
6.50 +– 0.15
1.05
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0° – 8°
0.25
0.60 +– 0.18
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
30
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-8D
—
Conforms
0.10 g
HA16117F Series
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,
copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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Copyright ' Hitachi, Ltd., 1998. All rights reserved. Printed in Japan.
31