PULSECORE PCS811PIUKF

PCS811/PCS812
January 2007
rev 0.1
5-Pin µP Voltage Supervisor with Manual Reset
FEATURES
DESCRIPTION
PCS811/PCS812 are low-power microprocessor (µP)
•
Ultra Low Supply Current 1µA(typ.)
supervisory circuits used to monitor power supplies in µP
•
Guaranteed Reset Valid to VCC=0.9V
and digital systems. They provide applications with
•
Available in two Output Types: Push-Pull
benefits of circuit reliability and low cost by eliminating
Active Low (PCS811), Push-Pull Active High
external components. PCS811/PCS812 also offer a
(PCS812)
manual reset input.
•
140ms Min. Power-On Reset Pulse Width
•
Internally Fixed Threshold 2.3V, 2.6V, 2.7V,
These devices perform as valid singles in applications with
2.9V, 3.1V, 4.0V, 4.4V, and 4.6V
VCC ranging from 6.0V down to 0.9V. The reset signal
•
Tight Voltage Threshold Tolerance: 1.5%
lasts for a minimum period of 140ms whenever VCC
•
Low profile Package: SOT-23-5
supply voltage falls below preset threshold. Both PCS811
and PCS812 were designed with a reset comparator to
APPLICATIONS
help identify invalid signals, which last less than 140ms.
•
Notebook Computers
The only difference between them is that they have an
•
Digital Still Cameras
active-low RESET output and active-high RESET output,
•
PDAs
respectively.
•
Critical Microprocessor Monitoring
Low supply current (1µA) makes PCS811/PCS812 ideal
RESET THRESHOLD
Suffix
Voltage(V)
L
4.6
M
4.4
J
4.0
T
3.1
S
2.9
Q
2.7
R
2.6
P
2.3
for portable equipment. The devices are available in 5SOT-23 package
Typical Operating Circuit
VCC
VCC
PCS811
(PCS812)
RESET
(RESET)
VCC
µP
RESET
INPUT
MR
GND
GND
Pushbutton
Switch
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
PCS811/PCS812
January 2007
rev 0.1
Pin Diagram
GND 1
NC 2
RESET (RESET) 3
5 VCC
PCS811
(PCS812)
4
MR
Pin Description
Pin#
Pin Name
PCS811
PCS812
1
1
GND
2
2
NC
Ground.
No Connection
RESET
3
Description
-
RESET is asserted LOW if VCC falls below VTH. RESET remains LOW for atleast
140ms (TRST) once VCC exceeds the Threshold. In addition, RESET is active LOW
as long as the manual reset (MR) is low.
RESET is asserted HIGH if VCC falls below VTH. RESET remains HIGH for atleast
-
3
RESET
140ms (TRST) once VCC exceeds the threshold. In addition, RESET is active HIGH
as long as the manual reset (MR) is low.
Manual Reset Input. A logic LOW on MR asserts reset. Reset remains active as
long as MR is LOW and for at least 180ms (TMRST) once MR returns HIGH. The
4
active low input has an internal 20kΩ pull-up resistor. The input should be left
4
open if not used. It can be driven by TTL or CMOS logic or shorted to ground by a
MR
switch.
5
5
VCC
Power supply input voltage (3.0V, 3.3V, 5.0V)
Block Diagram
RESET (RESET)
Bandgap
VCC
RESET Generator
R1
RPULL_UP
20K
R2
MR
GND
5-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice.
2 of 8
PCS811/PCS812
January 2007
rev 0.1
DETAIL DESCRIPTION
If a brownout condition occurs (VCC drops below the reset
RESET OUTPUT
threshold), RESET goes low. Any time VCC goes below
µP will be activated at a valid reset state. These µP
the reset threshold, the internal timer resets to zero, and
supervisory circuits assert reset to prevent code execution
RESET goes low. The internal timer is activated after VCC
errors
returns above the reset threshold, and RESET remains
during
power-up,
power-down,
or
brownout
conditions.
low for the reset timeout period.
RESET is guaranteed to be a logic low for
VTH>VCC>0.9V. Once VCC exceeds the reset threshold,
The manual reset input (MR) can also initiate a reset.
an internal timer keeps RESET low for the reset timeout
inverse of PCS811’s RESET output.PCS811’s RESET
period; after this interval, RESET goes high.
output.
MANUAL RESET INPUT
to prevent noise caused by long cables of MR or noisy
Many µP-based products require manual reset capability,
environment.
PCS812 has an active-high RESET output that is the
allowing operators, test technicians, or external logic
circuitry to initiate a reset. Logic low on MR asserts reset.
BENEFITS
Reset will remain asserted for the Reset Active Timeout
THRESHOLD
Period (tRP) after MR returns high. This input has an
PCS811/812 with specified voltage as 5V±10% or
internal 20KΩ pull-up resistor, so it can be floating if it is
3V±10% are ideal for systems using a 5V±5% or 3V±5%
not used. MR can be driven with TTL or CMOS-logic
power supply. The reset is guaranteed to assert after the
levels, or with open-drain/collector outputs. Another
power supply falls out of regulation, but before power
alternative is to connect a normal switch from MR to GND
drops below the minimum specified operating voltage
to create a manual reset function. Connecting a 0.1µF
range of the system ICs. The pre-trimmed thresholds are
capacitor from MR to ground can provide noise immunity
reducing the range over which an undesirable reset may
OF
HIGHLY
ACCURATE
RESET
occur.
APPLICATION INFORMATION
NEGATIVE-GOING VCC TRANSIENTS
must be valid down to 0V, adding a pull-down resistor to
In addition to issuing a reset to the µP during power-up,
RESET causes any leakage currents to flow to ground,
power-down, and brownout conditions, PCS811 series are
holding RESET low.
relatively resistant to short-duration negative-going VCC
INTERFACING TO µP WITH BIDIRECTIONAL RESET
transient.
PINS
ENSURING A VALID RESET OUTPUT DOWN TO
µPs with bidirectional reset pins can contend with
VCC=0
PCS811/812 reset outputs. If PCS811 RESET output is
When VCC falls below 0.9V, PCS811 RESET output no
asserted high and the µP wants to pull it low,
longer sinks current; it becomes an open circuit. In this
indeterminate logic levels may occur. To correct such
case, high-impedance CMOS logic inputs connecting to
cases, connect a resistor between PCS811 RESET (or
RESET can drift to undetermined voltages. Therefore,
PCS812 RESET) output and the µP reset I/O. Buffer the
PCS811/812 with CMOS is perfect for most applications of
reset output to other system components.
VCC below 0.9V. However in applications where RESET
5-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice.
3 of 8
PCS811/PCS812
January 2007
rev 0.1
Absolute Maximum Rating
Parameter
Min
Max
Unit
VCC
0.3
6.5
V
RESET,RESET
0.3
Vcc+0.3
V
Input Current (VCC,MR)
20
mA
Output Current (RESET or RESET)
20
mA
320
mW
Continuous Power Dissipation (TA=+70°C)
-40
Operating Junction Temperature Range
Junction Temperature
-65
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
+85
°C
125
°C
150
°C
260
°C
Test Circuit
TEST CIRCUIT
VCC
VCC
0.1uF
RESET
(RESET)
MR
GND
Pushbutton
Switch
5-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice.
4 of 8
PCS811/PCS812
January 2007
rev 0.1
Electrical Characteristics:
(Typical valves are at TA=+25°C unless otherwise specified.) (Note1)
Parameter
Opreating Voltage
Supply Current
Symbol
Test Conditions
VCC
ICC
Typ
0.9
VCC= VTH +0.1V
P device
R device
Q device
S device
RESET threshold
Min
VTH
T device
J device
M device
L device
1
TA=+25°C
2.265
TA-40°C to 85°C
2.254
TA=+25°C
2.561
TA-40°C to 85°C
2.548
TA=+25°C
2.660
TA-40°C to 85°C
2.646
TA=+25°C
2.857
TA-40°C to 85°C
2.842
TA=+25°C
3.054
TA-40°C to 85°C
3.038
TA=+25°C
3.940
TA-40°C to 85°C
3.920
TA=+25°C
4.334
TA-40°C to 85°C
4.312
TA=+25°C
4.531
TA-40°C to 85°C
4.508
VCC to Reset Delay
TRD
VCC=VTH to (VTH-0.1V), VTH =3.1V
Reset Active Timeout Period
TRP
VCC=VTH (MAX)
MR to Reset Progation delay
TMD
VCC=6V
MR Input Threshold
VIH
2.3
2.6
2.7
2.9
3.1
4.0
4.4
4.6
TA=+25°C
140
TA-40°C to 85°C
100
230
RESET output Voltage
V
3
μA
2.335
2.346
2.639
2.652
2.741
2.754
2.944
2.958
3.147
4.060
4.080
4.466
4.488
4.669
4.692
μS
560
1030
0.25VCC
VOH
VCC = VTH +0.1V, ISOURECE =1mA
VOL
VCC= VTH -0.1V, ISINK =1mA
VOH
VCC = VTH +0.1V, ISOURECE =1mA
VOL
VCC= VTH -0.1V, ISINK =1mA
20
mS
μS
0.7VCC
10
V
3.162
0.5
MR Pull-up Resistance
Unit
6
20
VIL
RESET output Voltage
Max
30
V
kΩ
0.8VCC
0.2VCC
0.8VCC
V
0.2VCC
Note1: Specifications are production tested at T =25°C. Specifications over the -40°C to 85°C operating temperature range are assured
A
by design, characterization and correlation with Statistical Quality Controls (SQC).
Note 2: RESET output is for PCS811: RESET output for PCS812
5-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice.
5 of 8
PCS811/PCS812
January 2007
rev 0.1
Ordering Information
Part #
Threshold Voltage
Temperature Range
Package
Top Marking
PCS811LIUKF
PCS811MIUKF
4.6
4.4
-40°C to +85°C
-40°C to +85°C
5-SOT-23
5-SOT-23
BQ46P
BQ44P
PCS811JIUKF
4.0
-40°C to +85°C
5-SOT-23
BQ40P
PCS811TIUKF
3.1
-40°C to +85°C
5-SOT-23
BQ31P
PCS811SIUKF
2.9
-40°C to +85°C
5-SOT-23
BQ29P
PCS811QIUKF
2.7
-40°C to +85°C
5-SOT-23
BQ27P
PCS811RIUKF
2.6
-40°C to +85°C
5-SOT-23
BQ26P
PCS811PIUKF
2.3
-40°C to +85°C
5-SOT-23
BQ23P
5-SOT-23
5-SOT-23
BR46P
BR44P
PCS812 ACTIVE HIGH RESET, LEAD FREE DEVICE
PCS812LIUKF
PCS812MIUKF
4.6
4.4
-40°C to +85°C
-40°C to +85°C
PCS812JIUKF
4.0
-40°C to +85°C
5-SOT-23
BR40P
PCS812TIUKF
3.1
-40°C to +85°C
5-SOT-23
BR31P
PCS812SIUKF
2.9
-40°C to +85°C
5-SOT-23
BR29P
PCS812QIUKF
2.7
-40°C to +85°C
5-SOT-23
BR27P
PCS812RIUKF
2.6
-40°C to +85°C
5-SOT-23
BR26P
PCS812PIUKF
2.3
-40°C to +85°C
5-SOT-23
BR23P
Note:
For parts to be packed in tape and reel, add “T” at the end of the part number
PulseCore Semiconductor parts are RoHS Compliant. All parts are lead free by default.
5-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice.
6 of 8
PCS811/PCS812
January 2007
rev 0.1
Package Information: 5L SOT 23 Package
Dimensions
Symbol
Inches
Min
Max
Millimeters
Min
Max
A
0.035
0.057
0.95
1.45
A1
0.00
0.006
0.05
0.15
A2
0.035
0.051
0.90
1.30
b
0.009
0.015
0.30
0.50
c
0.003
0.009
0.08
0.22
D
0.111
0.117
2.80
3.00
E
0.106
0.114
2.60
3.00
E1
0.060
0.066
1.50
1.70
L
0.014
0.022
0.30
0.60
L1
0.023 REF
0.60 REF
e
0.0256 BSC
0.95 BSC
e1
0.0768 BSC
1.90 BSC
θ
0°
8°
0°
8°
5-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice.
7 of 8
PCS811/PCS812
January 2007
rev 0.1
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Copyright © PulseCore Semiconductor
All Rights Reserved
Part Number: PCS811/812
Document Version: 0.1
Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued PulseCore Semiconductor, dated 11-11-2003
© Copyright 2007 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered
trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective
companies. PulseCore reserves the right to make changes to this document and its products at any time without notice.
PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein represents
PulseCore’s best data and/or estimates at the time of issuance. PulseCore reserves the right to change or correct this data at
any time, without notice. If the product described herein is under development, significant changes to these specifications are
possible. The information in this product data sheet is intended to be general descriptive information for potential customers
and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. PulseCore does
not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any
express or implied warranties related to the sale and/or use of PulseCore products including liability or warranties related to
fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to
in PulseCore’s Terms and Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made
exclusively according to PulseCore’s Terms and Conditions of Sale. The purchase of products from PulseCore does not
convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of
PulseCore or third parties. PulseCore does not authorize its products for use as critical components in life-supporting systems
where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of
PulseCore products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to
indemnify PulseCore against all claims arising from such use.
5-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice.
8 of 8