TCM809 TCM810 - Microchip Technology

TCM809

TCM810

TCM809/810-4 7/26/00

FEATURES

■Precision VCC Monitor for 3.0V, 3.3V, 5.0V

Nominal System V Supplies

■140msec Guaranteed Minimum RESET, RESET

Output Duration

■

RESET Output Guaranteed to VCC = 1.0V (TCM809)

■Low 17µA Supply Current

■VCC Transient Immunity

■Small 3-Pin SOT-23B Package

■No External Components

TYPICAL APPLICATIONS

■Computers

■Embedded Systems

■Battery Powered Equipment

■Critical µP Power Supply Monitoring

GENERAL DESCRIPTION

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.

The reset output is driven active within 20 µsec of VCC

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 3-Pin SOT-23B

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 OPERATING CIRCUIT ORDERING INFORMATION

Part No. Package Temp. Range

TCM809xENB 3-Pin SOT-23B – 40°C to +85°C

TCM809xVNB 3-Pin SOT-23B – 40°C to +125°C

TCM810xENB 3-Pin SOT-23B – 40°C to +85°C

TCM810xVNB 3-Pin SOT-23B – 40°C to +125°C

NOTE: The "X" denotes a suffix for VCC threshold - see table below.

PIN CONFIGURATION

TCM809

VCC

RESET RESET

INPUT

GND GND

PROCESSOR

VCC

RESET**(RESET)

GND

TCM809xENB

TCM810xENB

*3-Pin SOT-23B

NOTE: *3-Pin SOT-23B is equivalent to JEDEC TO-236

** () is for TCM810

Suffix Reset VCC Threshold (V)

4.63

M 4.38

J 4.00

T 3.08

S 2.93

R 2.63

NOTE: J version is available for TCM809 only.

3-Pin Microprocessor Reset Monitors

TCM809/810-4 7/26/00

TCM809

TCM810

3-Pin Microprocessor Reset Monitors

ABSOLUTE MAXIMUM RATINGS*

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/µsec

Operating Temperature Range .............– 40°C to +125°C

Power Dissipation (TA ≤ 70°C)

3-Pin SOT-23B (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.

PIN DESCRIPTION

Pin No.

(3-Pin SOT-23B) Symbol Description

1 GND Ground

2 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) RESET output remains high while VCC is below the reset voltage threshold,

and for 240msec (140msec min.) after VCC rises above reset threshold.

CC Supply voltage (Typ. +3.0V to +5.0V)

Symbol Parameter Test Conditions Min Typ Max Unit

VCC Range TA = 0°C to +70°C 1.0 —5.5 V

TA = – 40°C to +125°C 1.2 —5.5

ICC Supply Current TCM8xxL/M/J VCC < 5.5V —24 60 µA

TCM8xxR/S/T: VCC < 3.6V —17 50

VTH Reset Threshold (Note 2) TCM8xxL: TA = +25°C 4.56 4.63 4.70 V

TA = – 40°C to +125°C 4.50 —4.75

TCM8xxM: TA = +25°C 4.31 4.38 4.45

TA = – 40°C to +125°C 4.25 —4.50

TCM809J: TA = +25°C 3.93 4.00 4.06

TA = – 40°C to +125°C 3.89 —4.10

TCM8xxT: TA = +25°C 3.04 3.08 3.11

TA = – 40°C to +125°C 3.00 —3.15

TCM8xxS: TA = +25°C 2.89 2.93 2.96

TA = – 40°C to +125°C 2.85 —3.00

TCM8xxR: TA = +25°C 2.59 2.63 2.66

TA = – 40°C to +125°C 2.55 —2.70

Reset Threshold Tempco —30 —ppm/°C

VCC to Reset Delay (Note 2) VCC = VTH to (VTH – 100mV) —20 —µsec

Reset Active Timeout Period 140 240 560 msec

VOL RESET Output Voltage Low TCM809R/S/T: VCC = VTH min, ISINK = 1.2mA ——0.3 V

(TCM809) TCM809L/M/J: VCC = VTH min, ISINK = 3.2mA ——0.4

VCC > 1.0V, ISINK = 50µA——0.3

VOH RESET Output Voltage High

TCM809R/S/T: V

> V

max, I

SOURCE

= 500µA 0.8 V

——V

(TCM809)

TCM809L/M/J: V

> V

max, I

SOURCE

= 800µAV

– 1.5 ——

VOL RESET Output Voltage Low

CM810R/S/T: VCC = VTH max, ISINK = 1.2mA ——0.3 V

(TCM810)

CM810L/M/J: VCC = VTH max, ISINK = 3.2mA ——0.4

VOH RESET Output Voltage High 1.8 < VCC < VTH min, ISOURCE = 150µA 0.8 VCC ——V

(TCM810)

NOTES: 1. Production testing done at TA = +25°C, over temperature limits guaranteed by design.

2. RESET output for TCM809, RESET Output for TCM810.

ELECTRICAL CHARACTERISTICS: Vcc = Full Range, TA = Operating Temperature Range unless other-

wise noted. Typical values are at TA = +25°C, VCC = 5V for L/M/J, 3.3V forT/S, 3.0V for R (Note 1).

TCM809

TCM810

3-Pin Microprocessor Reset Monitors

valid to VCC = 0V, a pull-down resistor must be connected

from RESET to ground to discharge stray capacitances and

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

suitable for most applications). Similarly, a pull-up resistor to

VCC is required for the TCM810 to ensure a valid high

RESET for VCC below 1.0V.

Processors With Bidirectional I/O Pins

Some µP's (such as Motorola 68HC11) have bi-direc-

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

4.7kΩ 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.

APPLICATIONS INFORMATION

VCC Transient Rejection

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

detected as a brownout or power-down. Transient immunity

can be improved by adding a capacitor in close proximity to

the VCC pin of the TCM809/810.

RESET Signal Integrity During Power-Down

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

Figure 2. Ensuring RESET Valid to VCC = 0V

Figure 1. Maximum Transient Duration vs.

Overdrive for Glitch Rejection at 25°C

Figure 3. Interfacing to Bidirectional Reset I/O

RESET COMPARATOR OVERDRIVE,

[

VTH - VCC

]

(mV)

400

240

160

320

015100 1000

MAXIMUM TRANSIENT DURATION (µsec)

TA = +25°C

Duration

Overdrive

TCM8XXL/M/J

TCM8XXR/S/T

TCM809

100k

RESET

GND

TCM809

RESET

GND

RESET

GND

BUFFERED RESET

TO OTHER SYSTEM

COMPONENTS

BUFFER

µP

4.7k

TCM809/810-4 7/26/00

TCM809

TCM810

3-Pin Microprocessor Reset Monitors

TYPICAL CHARACTERISTICS

TEMPERATURE (°C)

–40 020

–20 40 60 125

SUPPLY CURRENT (µA)

Supply Current vs.Temperature

(No Load, TCM8xxR/S/T)

VCC = 5V

VCC = 3V

VCC = 1V

TEMPERATURE (°C)

100

–40 020

–20 40 60 125

POWER-DOWN RESET DELAY (µsec)

Power-Down Reset Delay vs. Temperature

(TCM8xxR/S/T)

VOD = VTH – VCC

VOD = 10mV

VOD = 20mV

VOD = 100mV

VOD = 200mV

TEMPERATURE (°C)

–40 020

–20 40 60 125

SUPPLY CURRENT (µA)

Supply Current vs.Temperature

(No Load, TCM8xxL/M/J)

VCC = 5V

VCC = 3V

VCC = 1V

1.001

1.002

1.003

1.000

0.999

0.998

0.997

TEMPERATURE (°C)

–40 020

–20 40 60 125

NORMALIZED THRESHOLD

Normalized Reset Threshold vs. Temperature

TEMPERATURE (°C)

240

245

250

235

230

225

–40 020

–20 40 80 125

POWER-UP RESET TIMEOUT (msec)

Power-Up Reset Timeout vs. Temperature

TCM8xxL/M/J

TCM8xxR/S/T

TEMPERATURE (°C)

100

120

140

–40 020

–20 40 60 125

POWER-DOWN RESET DELAY (µsec)

Power-Down Reset Delay vs. Temperature

(TCM8xxL/M/J)

VOD = VTH – VCC

VOD = 10mV

VOD = 20mV

VOD = 100mV

VOD = 200mV

60 100

10080

10080 10080

10080

100

TCM809

TCM810

3-Pin Microprocessor Reset Monitors

TAPING FORM

3-Pin SOT-23B

MARKING

Part Numbers and Part Marking



 = part number code + temperature range

(two-digit code).

TCM809 Code

TCM809LENB J1

TCM809MENB J2

TCM809TENB J3

TCM809SENB J4

TCM809RENB J5

TCM809JENB J6

TCM809LVNB JZ

TCM809MVNB JY

TCM809TVNB JX

TCM809SVNB JV

TCM809RVNB JU

TCM809JVNB JT

User Direction of Feed

Device

Marking

Component Taping Orientation for 3-Pin SOT-23B (JEDEC TO-236) Devices

PIN 1

Standard Reel Component Orientation

For TR Suffix Device

(Mark Right Side Up)

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

3-Pin SOT-23B 8 mm 4 mm 3000 7 in

Carrier Tape, Number of Components Per Reel and Reel Size

TCM810 Code

TCM810LENB K1

TCM810MENB K2

TCM810TENB K3

TCM810SENB K4

TCM810RENB K5

TCM810LVNB KZ

TCM810MVNB KY

TCM810TVNB KX

TCM810SVNB KV

TCM810RVNB KU

ex: M809LENB = 

represents year and quarter code

represents lot ID number

TCM809/810-4 7/26/00

TCM809

TCM810

3-Pin Microprocessor Reset Monitors

PACKAGE DIMENSIONS

Dimensions: inches (mm)

.021 (0.54)

.015 (0.37)

.055 (1.40)

.047 (1.20)

.103 (2.64)

.083 (2.10)

.120 (3.05)

.105 (2.67)

.007 (0.18)

.003 (0.085)

.010 (0.25)

.005 (0.13)

.024 (0.60)

.017 (0.44)

.004 (0.10)

.001(0.02)

.040 (1.02)

.031 (0.79)

.080 (2.05)

.070 (1.78)

8° MAX.

3-Pin SOT-23B (JEDEC TO-236)

01/09/01

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TCM809/810-4 7/26/00