TL7702AIP/A STMicroelectronics

TL7700A Series SUPPLY VOLTAGE SUPERVISORS . POWER-ON RESET GENERATOR .AUTOMATIC RESET GENERATION AFTER VOLTAGE DROP .WIDE SUPPLY VOLTAGE RANGE ... 3V TO 18V . PRECISION VOLTAGE SENSOR .TEMPERATURE-COMPENSATED VOLTAGE REFERENCE . TRUE AND COMPLEMENT RESET OUTPUTS N . EXTERNALLY ADJUSTABLE PULSE WIDTH Minidip DESCRIPTION The TL7700A series are monolithic supply voltage supervisor ICs specifically designed for use as reset D controllers in microcomputer and microprocessor SO8 systems. During power-up the device tests the sup- ply voltage and keeps the RESET and RESET out- puts active (high and low, respectively) as long as the supply voltage has not reached its nominal volt- age value. Taking RESIN low has the same effect. To ensure that the microcomputer system has reset, the TL7700A then initiates an internal time count that delays the return of the reset outputs to their in- ORDERING NUMBERS active states. Since the time delay for most micro- Temperature Range Minidip S08 computers and microprocessors is in the order of o several machine cycles, the device internal time de- 0 to 70 C TL77XXACP TL77XXACD o lay is determined by an external capacitor con- -25 to 85 C TL77XXAIP TL77XXAID nected to the C input (pin 3). T 4 t x C po = 1.3 x 10 T (top view) PIN CONNECTION Where : C is in farads (F) and t in seconds (s). In T po addition, when the supply voltage drops below the nominal value, the outputs will be active until the supply voltage returns to the nominal value. An ex- ternal capacitor (typically 0.1 F) must be connected to the REF output (pin 1) to reduce the influence of fast transients in the supply voltage. The TL7700AI series is characterized for operation o o from 25 C to 85 C the TL7700AC series is char- o o acterized from 0 C to 70 C. 1/7 July 2000 Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) TL7700A Series BLOCK DIAGRAM * TL7702A R1 = 0, R2 = open TL7705A R1 = 7.8 K, R2 = 10k TL7709A R1 = 19.7 K, R2 = 10k TL7712A R1 = 32.7k, R2 = 10k TL7715A R1 = 43.4 K, R2 = 10k. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Supply Voltage, V - (see note 1) 20 V S CC V Input Voltage Range at RESIN -0.3 to 20 V i V Input Voltage at SENSE : TL7702A (see note 2) -0.3 to 6 V i TL7705A -0.3 to 10 I High-level Output Current at RESET -30 mA OH I Low-level Output Current at RESET 30 mA OL o T Operating Free-air Temperature Range : C amb TL77XXAI -25 to 85 TL77XXAC 0 to 70 o T Storage Temperature Range -65 to 150 C stg Notes : 1. All voltage values are with respect to the network ground terminal 2. For the TL7700A, the voltage applied to the SENSE terminal must never exceed Vs. THERMAL DATA Symbol Parameter Value Unit o R Thermal Resistance Junction-ambient Max. 120 C/W th j-amb RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min. Max. Unit V Supply Voltage 3.6 18 V S V High-level Input Voltage at RESIN 2 V IH V Low-level Input Voltage at RESIN 0.6 V IL V Voltage at Sense Input TL7702A 0 See note 3 V i TL7705A 0 10 I High-level Output Current at RESET -16 mA OH I Low-level Output Current at RESET 16 mA OL o T Operating Free-air Temperature Range TL77-AI -25 85 C amb TL77-AC 0 70 Note : 3. For proper operation of the TL7702A, the voltage applied to the SENSE terminal should not exceed Vs - 1V or 6V, which ever is less. 2/7 Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s)