TCM810 [TELCOM]
3-PIN UP RESET MONITORS; 3 -PIN UP RESET监听音箱
| 型号： | TCM810 |
| 厂家： | 
TELCOM SEMICONDUCTOR, INC |
| 描述： | 3-PIN UP RESET MONITORS |
| 文件： | 总4页 (文件大小：62K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRELIMINARY INFORMATION
5
TCM809
TCM810
3-PIN µP RESET MONITORS
FEATURES
GENERAL DESCRIPTION
■ Precision VCC Monitor for 3.0V, 3.3V, 5.0V
Nominal System V Supplies
■ 140msec Guaranteed Minimum RESET, RESET
Output Duration
The TCM809 and TCM810 are cost-effective system
supervisor circuits designed to monitor VCC in digital sys-
tems and provide a reset signal to the host processor when
necessary. No external components are required.
■
RESET Output Guaranteed to VCC = 1.0V (TCM809)
The reset output is driven active within 20msec of V
CC
■ Low 17µA Supply Current
■ VCC Transient Immunity
■ Small SOT-23B-3 Package
■ No External Components
falling through the reset voltage threshold. Reset is main-
tained active for a minimum of 140msec after VCC rises
above the reset threshold. The TCM810 has an active-high
reset output while the TCM809 has an active-low reset
output. The output of the TCM809 is guaranteed valid down
to VCC = 1V. Both devices are available in a
SOT-23B-3 package.
The TCM809/810 are optimized to reject fast transient
glitches on the VCC line. Low supply current of 17µA
(VCC = 3.3V) makes these devices suitable for battery
powered applications.
TYPICAL APPLICATIONS
■ Computers
■ Embedded Systems
■ Battery Powered Equipment
■ Critical µP Power Supply Monitoring
TYPICAL OPERATING CIRCUIT
ORDERING INFORMATION
VCC
Part No.
Package
Temp. Range
T
CM809xENB
SOT-23B-3
SOT-23B-3
– 40°C to +85°C
– 40°C to +85°C
VCC
VCC
TCM810xENB
PROCESSOR
NOTE: The "X" denotes a suffix for VCC threshold - see table below.
RESET
INPUT
RESET
TCM809
Suffix
Reset VCC Threshold (V)
GND
GND
L
M
T
4.63
4.38
3.08
2.93
2.63
S
R
PIN CONFIGURATION
*SOT-23B-3
1
GND
V
TCM809xENB
TCM810xENB
3
CC
RESET (RESET)
2
NOTE: *SOT-23B-3 is equivalent to JEDEC (TO-236)
** () is for TCM810
TCM809/810-04 8/29/96
TELCOM SEMICONDUCTOR, INC.
5-15
PRELIMINARY INFORMATION
3-PIN µP RESET MONITORS
TCM809
TCM810
Power Dissipation (TA ≤ 70°C)
ABSOLUTE MAXIMUM RATINGS*
SOT-23B-3 (derate 4mW/°C above +70°C) ...230mW
Storage Temperature Range ................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +260°C
*This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational sections of
the specifications is not implied. Exposure to Absolute Maximum Rating
Conditions for extended periods may affect device reliability.
Supply Voltage (VCC to GND) ................................ +6.0V
RESET, RESET ............................ – 0.3V to (VCC + 0.3V)
Input Current, VCC.. ..................................................20mA
Output Current, RESET, RESET .............................20mA
dV/dt (VCC) .......................................................... 100V/µS
Operating Temperature Range ............... – 40°C to +85°C
ELECTRICAL CHARACTERISTICS: Vcc = 5V, TA = Operating Temperature Range unless otherwise noted.
Symbol Parameter
Test Conditions
Min
Typ
Max
Unit
VCC Range
TA = 0°C to +70°C
TA = – 40°C to +85°C
1.0
1.2
—
—
5.5
5.5
V
ICC
Supply Current
TCM8xxL/M: VCC < 5.5V
TCM8xxR/S/T: VCC < 3.6V
—
—
24
17
60
50
µA
VTH
Reset Threshold
(Note 2)
TCM8xxL: TA = +25°C
TA = – 40°C to +85°C
TCM8xxM: TA = +25°C
TA = – 40°C to +85°C
TCM8xxT: TA = +25°C
TA = – 40°C to +85°C
TCM8xxS: TA = +25°C
TA = – 40°C to +85°C
TCM8xxR: TA = +25°C
TA = – 40°C to +85°C
4.56
4.50
4.31
4.25
3.04
3.00
2.89
2.85
2.59
2.55
4.63
—
4.38
—
3.08
—
2.93
—
4.70
4.75
4.45
4.50
3.11
3.15
2.96
3.00
2.66
2.70
V
2.63
—
Reset Threshold Tempco
VCC to Reset Delay
—
30
—
ppm/°C
(Note 2)
VCC = VTH to (VTH – 100mV)
—
20
—
µsec
msec
V
Reset Active Timeout Period
140
240
560
VOL
RESET Output Voltage Low
(TCM809)
TCM809R/S/T: VCC = VTH min, ISINK = 1.2mA
TCM809L/M: VCC = VTH min, ISINK = 3.2mA
VCC > 1.0V, ISINK = 50µA
—
—
—
—
—
—
0.3
0.4
0.3
VOH
VOL
RESET Output Voltage High
(TCM809)
TCM809R/S/T: VCC > VTH max, ISOURCE = 500µA
TCM809L/M: VCC > VTH max, ISOURCE = 800µA VCC – 1.5
0.8 VCC
—
—
—
—
V
V
V
RESET Output Voltage Low
(TCM810)
T
T
CM810R/S/T: VCC = VTH max, ISINK = 1.2mA
CM810L/M: VCC = VTH max, ISINK = 3.2mA
—
—
—
—
0.3
0.4
VOH
RESET Output Voltage High
(TCM810)
1.8 < VCC < VTH min, ISOURCE = 150µA
0.8 VCC
—
—
NOTES:
1. Production testing done at TA = +25°C, over temperature limits guaranteed by design.
2. RESET output for TCM809, RESET Output for TCM810.
PIN DESCRIPTION
Pin No.
(SOT-23B-3)
Symbol
Description
1
2
GND
Ground
RESET (TCM809)
RESET output remains low while VCC is below the reset voltage threshold, and
for 240msec (140msec min.) after VCC rises above reset threshold.
2
RESET (TCM810)
VCC
RESET output remains high while VCC is below the reset voltage threshold,
and for 240msec (140msec min.) after VCC rises above reset threshold.
3
Supply voltage (Typ. +3.0V to +5.0V)
5-16
TELCOM SEMICONDUCTOR, INC.
PRELIMINARY INFORMATION
3-PIN µP RESET MONITORS
5
TCM809
TCM810
APPLICATIONS INFORMATION
VCC Transient Rejection
valid to VCC = 0V, a pull-down resistor must be connected
fromRESETtogroundtodischarge straycapacitancesand
hold the output low (Figure 2). This resistor value, though
not critical, should be chosen such that it does not apprecia-
bly load RESET under normal operation (100kΩ will be
suitableformostapplications).Similarly,apull-upresistorto
VCC is required for the TCM810 to ensure a valid high
RESET for VCC below 1.0V.
The TCM809/810 provides accurate VCC monitoring
and reset timing during power-up, power-down, and brown-
out/sag conditions, and rejects negative-going transients
(glitches) on the power supply line. Figure 1 shows the
maximum transient duration vs. maximum negative excur-
sion (overdrive) for glitch rejection. Any combination of
duration and overdrive which lies under the curve will not
generate a reset signal. Combinations above the curve are
detectedasabrownoutorpower-down. Transientimmunity
can be improved by adding a capacitor in close proximity to
the VCC pin of the TCM809/810.
VCC
VCC
TCM809
RESET
V
CC
V
TH
R1
100k
Overdrive
GND
Duration
Figure 2. Ensuring RESET Valid to VCC = 0V
Processors With Bidirectional I/O Pins
400
T
= +25°C
A
Some µP's (such as Motorola 68HC11) have bidirec-
tional reset pins. Depending on the current drive capability
of the processor pin, an indeterminate logic level may result
if there is a logic conflict. This can be avoided by adding a
4.7k resistor in series with the output of the TCM809/810
(Figure 3). If there are other components in the system
which require a reset signal, they should be buffered so as
not to load the reset line. If the other components are
required to follow the reset I/O of the µP, the buffer should
be connected as shown with the solid line.
320
240
160
TCM8xxLM
80
0
TCM8xxR/S/T
10
BUFFERED RESET
TO OTHER SYSTEM
COMPONENTS
1
1000
100
BUFFER
RESET COMPARATOR OVERDRIVE,
(V - V (mV)
TH
CC
VCC
Figure 1. Maximum Transient Duration vs.
VCC
µP
RESET
VCC
Overdrive for Glitch Rejection at 25°C
TCM809
4.7k
RESET Signal Integrity During Power-Down
RESET
The TCM809 RESET output is valid to VCC = 1.0V.
Below this voltage the output becomes an "open circuit" and
does not sink current. This means CMOS logic inputs to the
µP will be floating at an undetermined voltage. Most digital
systems are completely shutdown well above this voltage.
However, in situations where RESET must be maintained
GND
GND
Figure 3. Interfacing to Bidirectional Reset I/O
TELCOM SEMICONDUCTOR, INC.
5-17
PRELIMINARY INFORMATION
3-PIN µP RESET MONITORS
TCM809
TCM810
TYPICAL CHARACTERISTICS
Supply Current vs.Temperature
(No Load, TCM8xxR/S/T)
Supply Current vs.Temperature
(No Load, TCM8xxL/M)
30
25
20
35
30
V
= 5V
= 3V
CC
V
= 5V
= 3V
CC
25
20
15
10
5
V
V
CC
CC
15
10
V
= 1V
5
0
CC
V
= 1V
CC
0
0
0
–40
–20
40
60
–40
–20
40
TEMPERATURE (°C)
60
20
20
85
85
TEMPERATURE (°C)
Power-Down Reset Delay vs. Temperature
(TCM8xxR/S/T)
Power-Down Reset Delay vs. Temperature
(TCM8xxL/M)
100
80
140
120
100
80
V
V
= VTH – V
= 10mV
V
V
= V
– V
TH CC
OD
OD
CC
OD
OD
= 10mV
60
V
= 20mV
OD
V
= 20mV
OD
60
40
40
V
V
= 100mV
20
0
V
= 100mV
OD
OD
OD
OD
20
0
V
= 200mV
60
= 200mV
60
0
0
–40
–20
40
–40
–20
40
20
20
85
85
TEMPERATURE (°C)
TEMPERATURE (°C)
Normalized Reset Threshold vs. Temperature
Power-Up Reset Timeout vs. Temperature
1.003
1.002
1.001
250
245
240
235
TCM8xxL/M
1.000
0.999
TCM8xxR/S/T
230
0.998
0.997
225
0
–40
–20
40
60
20
85
0
–40
–20
40
TEMPERATURE (°C)
60
20
85
TEMPERATURE (°C)
5-18
TELCOM SEMICONDUCTOR, INC.
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