Document
PRELIMINARY INFORMATION
1
TCM809 TCM810 3-PIN µP RESET MONITORS
FEATURES
s s s s s s s 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 SOT-23B-3 Package No External Components
GENERAL DESCRIPTION
The TCM809 and TCM810 are cost-effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. No external components are required. The reset output is driven active within 20msec of V CC falling through the reset voltage threshold. Reset is maintained 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 V CC = 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.
2 3 4 5 6 7
TYPICAL APPLICATIONS
s s s s Computers Embedded Systems Battery Powered Equipment Critical µP Power Supply Monitoring
TYPICAL OPERATING CIRCUIT
VCC VCC VCC PROCESSOR RESET INPUT
ORDERING INFORMATION
Part No.
TCM809xENB TCM810xENB
Package
SOT-23B-3 SOT-23B-3
Temp. Range
– 40°C to +85°C – 40°C to +85°C
NOTE: The "X" denotes a suffix for VCC threshold - see table below.
RESET TCM809 GND
Suffix
GND
Reset VCC Threshold (V)
4.63 4.38 3.08 2.93 2.63
PIN CONFIGURATION *SOT-23B-3
L M T S R
GND
1
TCM809xENB TCM810xENB
3
VCC
RESET (RESET)
2
NOTE: *SOT-23B-3 is equivalent to JEDEC (TO-236) ** () is for TCM810
TCM809/810-04 8/29/96
8
5-15
TELCOM SEMICONDUCTOR, INC.
PRELIMINARY INFORMATION
3-PIN µP RESET MONITORS
TCM809 TCM810
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/µS Operating Temperature Range ............... – 40°C to +85°C Power Dissipation (TA ≤ 70°C) 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.
ELECTRICAL CHARACTERISTICS: Vcc = 5V, TA = Operating Temperature Range unless otherwise noted.
Symbol Parameter
VCC Range ICC VTH Supply Current Reset Threshold
Test Conditions
TA = 0°C to +70°C TA = – 40°C to +85°C TCM8xxL/M: VCC < 5.5V TCM8xxR/S/T: VCC < 3.6V (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 (Note 2) VCC = VTH to (VTH – 100mV)
Min
1.0 1.2 — — 4.56 4.50 4.31 4.25 3.04 3.00 2.89 2.85 2.59 2.55 —
Typ
— — 24 17 4.63 — 4.38 — 3.08 — 2.93 — 2.63 — 30 20 240 — — — — — — — —
Max
5.5 5.5 60 50 4.70 4.75 4.45 4.50 3.11 3.15 2.96 3.00 2.66 2.70 — — 560 0.3 0.4 0.3 — — 0.3 0.4 —
Unit
V µA
V
Reset Threshold Tempco VCC to Reset Delay Reset Active Timeout Period RESET Output Voltage Low (TCM809) RESET Output Voltage High (TCM809) RESET Output Voltage Low (TCM810) RESET Output Voltage High (TCM810)
ppm/°C µsec msec V
VOL
VOH VOL VOH
NOTES:
— 140 TCM809R/S/T: VCC = VTH min, ISINK = 1.2mA — TCM809L/M: VCC = VTH min, ISINK = 3.2mA — VCC > 1.0V, ISINK = 50µA — TCM809R/S/T: VCC > VTH max, ISOURCE = 500µA 0.8 VCC TCM809L/M: VCC > VTH max, ISOURCE = 800µA VCC – 1.5 TCM810R/S/T: VCC = VTH max, ISINK = 1.2mA — TCM810L/M: VCC = VTH max, ISINK = 3.2mA — 1.8 < VCC < VTH min, ISOURCE = 150µA 0.8 VCC
V V V
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)
1 2 2 3
5-16
Symbol
GND RESET (TCM809) RESET (TCM810) VCC
Description
Ground RESET output remains low while VCC is below the reset voltage threshold, and for 240msec (140msec min.) after VCC rises above reset threshold. RESET output remains high while VCC is below the reset voltage threshold, and for 240msec (140msec min.) after VCC rises above reset threshold. Supply voltage (Typ. +3.0V to +5.0V)
TELCOM SEMICONDUCTOR, INC.
3-PIN µP RESET MONITORS
PRELIMINARY INFORMATION
1
TCM809 TCM810
APPLICATIONS INFORMATION VCC Transient Rejection
The TCM809/810 provid.