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1
Memory ICs
System reset IC
BH6150F
The BH6150F has two reset circuits, one detects the power supply voltage, and the other detects the input voltage.
With this one IC it is possible to apply a reset to the logic systems of CPUs, and mechanical systems.
•
Applications
Personal computers, CPUs, MPUs, logic circuits, reset
circuits for mechanical systems, level detector circuits,
battery voltage detector circuits, and backup power
supply switching circuits
•
Features
Two types of reset circuit provided.
1) Reset circuit 1 (input voltage detector)
Detection voltage: 1.25V (Typ.)
Transmission delay time: 200µs (Typ.)
Open collector output, and 10kΩ pull-up resistor on
chip.
2) Reset circuit 2 (supply voltage detector)
Detection voltage: 4.2V (Typ.)
Transmission delay time: 25, 50, 100 and 200 ms
(select using the Ct0 and Ct1 pins)
Manual reset function provided
Open collector output, and 10kΩ pull-up resistor on
chip.
•
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
V
CC
Pd
Topr
Tstg
V
mW
°C
°C
∗
Reduced by 4.5mW for each increase in Ta of 1°C over 25°C.
– 0.3 ~ + 7.0
– 20 ~ + 75
– 40 ~ + 125
450
∗
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Memory ICs BH6150F
•
Block diagram
–
+
–
+
–
Delay
Circuit
Reset Circuit 2
Reset Circuit 1
10k
10k
1234
8765
Vref
1.25V
Vref
1.25V
•
Pin descriptions
Pin No. Pin name Function
1
2
3
4
5
6
7
8
∗
When neither Ct0 or Ct1 are connected, the delay time is 100ms (Typ.).
Ct0
Input
Ct1
GND
Output 2
Output 1
V
CC
Manual reset
Delay time control
∗
Reset circuit 1 input
Delay time control
∗
GND
Reset circuit 2 output
Reset circuit 1 output
Power supply
Manual reset input
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Memory ICs BH6150F
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Input / output circuits
Input
Ct0, Ct1
Manual reset Output 1, Output 2
Page 4
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Memory ICs BH6150F
•
Electrical characteristics (unless otherwise specified VCC = 4.5V to 5.5V and Ta = 25°C)
Reset circuit 1
Parameter
Symbol Min. Typ. Max. Unit Conditions
Detection voltage
Hysteresis voltage
High level transmission delay time
Low level transmission delay time
Output low level voltage
Input voltage range
Input current
V
S1
∆VS1
TPLH1
TPHL1
VOL1
VIN
IIN
1.20
9
80
—
—
– 0.3
—
1.25
15
200
10
0.1
—
200
1.30
23
500
—
0.4
V
CC
500
V
mV
µs
µs
V
V
nA
—
—
—
CL = 100pF
CL = 100pF
V
IN < 1.2V, IOL = 5mA
V
IN = 1.25V
Reset circuit 2
Parameter
Symbol Min. Typ. Max. Unit Conditions
Detection voltage
Hysteresis voltage
High level transmission delay time
Low level transmission delay time
Output low level voltage
Manual reset
Input high level voltage
Input high level current
Input low level voltage
VS2
∆VS2
TPLH2
TPHL2
VOL2
VRESH
IRESH
VRESL
4.0
30
15
30
60
120
—
—
2
—
– 0.3
4.2
50
25
50
100
200
0.5
0.1
—
20
—
4.4
100
35
70
140
280
—
0.4
V
CC
80
0.8
V
mV
ms
ms
ms
ms
µs
V
V
µA
V
Ct0 = L, Ct1 = H
Ct0 = H, Ct1 = L
Ct0 = H, Ct1 = H
Ct0 = L, Ct1 = L
CL = 100pF
V
CC < 4V, IOL = 5mA
V
RES = 2V
CL = 100pF
—
—
—
—
Common specifications
Parameter
Symbol Min. Typ. Max. Unit Conditions
Circuit current when off
Circuit current when on
Detection voltage temperature coefficient
Output high level voltage
Operation limit voltage
I
CC1
ICC2
VS / ∆T
V
OH1,2
VOPL1,2
—
—
—
V
CC – 0.7
—
1000
2
0.01
V
CC – 0.4
0.71
1400
3
—
—
0.85
µA
mA
% / °C
V
V
V
CC = 5V, VIN > VS1
VCC = 4V, VIN < VS1
IOH = 40µA
V
SAT ⬉ 0.4V, RL = 1K
—
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Memory ICs BH6150F
A
A
V
V
IOH
IOL
VOH2
VOL2
VOPL2
CL
IOH
IOL
VOH1
VOL1
VOPL1
CL
V
CC
RL = 1k
V
OPL2: ON
V
CC
RL = 1k
V
OPL2: ON
8
BH6150F
ICC1
ICC2
765
1234
A
VCC
MRES VCC OUT 1 OUT 2
Ct0 IN Ct1 GND
I
RESH
VRES
IIN
∆VS1
VS1
V
IN
•
Measurement circuit
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Memory ICs BH6150F
•
Circuit operation
VIN
VS1 + ∆VS1 (Typ. = 1.265V)
V
S1 (Typ. = 1.25V)
5V
TPHL2
TPLH1 TPHL1 TPLH1
TPLH2 TPLH2
0V
V
OHVOUT1
VOL1
VCC
VS2 + ∆VS2 (Typ. = 4.25V)
V
S2 (Typ. = 4.2V)
V
CC
0V
V
OHVOUT2
VOL2
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Memory ICs BH6150F
– 20
1.20
1.15
1.25
1.30
1.35
0 20406080
DETECTING VOLTAGE: VS1 (V)
AMBIENT TEMPERATURE: Ta (°C)
Fig. 1 Reset circuit 1 detector
voltage vs.
ambient temperature
•
Electrical characteristic curves
– 20
10
5
15
20
25
0 20406080
HYSTERESIS VOLTAGE: ∆VS1 (mV)
AMBIENT TEMPERATURE: Ta (°C)
Fig. 2 Reset circuit 1 Hysteresis
voltage vs.
ambient temperature
– 20
120
80
160
200
240
280
0 20406080
“H” PROPAGATION DELAY TIME: TPLH1 (µS)
AMBIENT TEMPERATURE: Ta (°C)
Fig. 3 Reset circuit 1 high level
transmission delay time vs.
ambient temperature
– 20
3.8
4.0
4.1
4.2
4.3
4.4
0 20406080
DETECTING VOLTAGE: VS2 (V)
AMBIENT TEMPERATURE: Ta (°C)
Fig. 4 Reset circuit 2 detector
voltage vs.
ambient temperature
– 20
0
20
40
60
80
100
0 20406080
HYSTERESIS VOLTAGE: ∆ VS2 (mV)
AMBIENT TEMPERATURE: Ta (°C)
Fig. 5 Reset circuit 2 Hysteresis
voltage vs.
ambient temperature
– 20
40
0
80
120
160
200
0 20406080
“H” PROPAGATION DELAY TIME: TPLH2 (mS)
AMBIENT TEMPERATURE: Ta (°C)
Fig. 6 Reset circuit 2 high level
transmission delay time vs.
ambient temperature
Ct0 = L, Ct1 = H
Ct0 = H, Ct1 = L
Ct0 = H, Ct1 = H
Ct0 = L, Ct1 = L
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Memory ICs BH6150F
0
0.5
0
1.0
0.5 1.0
MAXIMUM OPERATING VOLTAGE: VOPL1, 2 (V)
POWER SUPPLY VOLTAGE: VCC (V)
Fig. 7 Operation limit voltage vs.
power supply voltage
RL = 1k
R
L = 27k
R
L = ∞
•
External dimensions (Units: mm)
SOP8
0.4 ± 0.11.27
0.15
0.3Min.
0.15 ± 0.1
0.11
6.2 ± 0.3
4.4 ± 0.2
5.0 ± 0.2
85
41
1.5 ± 0.1
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