|Category||Power Management => Supervisory Circuits => System Supervisors/Reset => Precision Reset|
|Description||Precision Reset Controller And 4k I2C Memory With Both Active High And Active Low Reset Outputs|
|Company||Summit Microelectronics, Inc.|
|Datasheet||Download S24042 datasheet
Precision RESET Controller and 4K I2C Memory With Both RESET and RESET Outputs
FEATURES Precision Supply Voltage Monitor Dual reset outputs for complex microcontroller systems Integrated memory write lockout Guaranteed RESET (RESET#) assertion to VCC=1V Power-Fail Accuracy Guaranteed No External Components 3 and 5 Volt system versions Low Power CMOS Active current less than 3mA Standby current less than 25µA Memory Internally Organized X 8 Two Wire Serial Interface (I2CTM) Bidirectional data transfer protocol Standard 100KHz and Fast 400KHz
High Reliability Endurance: 100,000 erase/write cycles Data retention: 100 years 8-Pin PDIP or SOIC Packages
OVERVIEW The S24042 and S24043 are power supervisory devices with 4,096 bits of serial E2PROM. They are fabricated using SUMMIT's advanced CMOS E2PROM technology and are suitable for both 3 and 5 volt systems. The memory is internally organized 8. It features the I2C serial interface and software protocol allowing operation on a simple two-wire bus. The S24042 provides a precision VCC sense circuit and two open drain outputs: one (RESET) drives high and the other (RESET#) drives low whenever VCC falls below VTRIP. The S24043 is identical to the S24042 with the exception being RESET is not bonded out on pin 7.1.26V SCL SDA 6 5 MODE DECODE ADDRESS DECODER WRITE CONTROL
PIN CONFIGURATIONS RESET RESET# is an active low open drain output. It is driven low whenever VCC is below VTRIP. It is also an input and can be used to debounce a switch input or perform signal conditioning. The pin has an internal pullup and should be left unconnected if the signal is not used in the system. However, when the pin is tied to a system RESET# line an external pull-up resistor should be employed. RESET - RESET is an active high open drain output. It is driven high whenever VCC is below VTRIP. RESET is also an input and can be used to debounce a switch input or perform signal conditioning. The RESET pin does have an internal pull-down and should be left unconnected if the signal is not used in the system. However, when the pin is tied to a system reset line an external pull-down resistor should be employed.
ENDURANCE AND DATA RETENTION The S24042/43 is designed for applications requiring 100,000 erase/write cycles and unlimited read cycles. It provides 100 years of secure data retention, with or without power applied, after the execution of 100,000 erase/write cycles. APPLICATIONS Reset Controller Description The S24042/43 provides a precision RESET controller that ensures correct system operation during brown-out and power-up/-down conditions. It is configured with two open drain RESET outputs; pin is an active high output and pin is an active low output. During power-up, the RESET outputs remain active until VCC reaches the VTRIP threshold and will continue driving the outputs for approximately 200ms after reaching VTRIP. The RESET outputs will be valid so long as VCC > 1.0V. During power-down, the RESET outputs will begin driving active when VCC falls below VTRIP. The RESET pins are I/Os; therefore, the S24042/43 can act as a signal conditioning circuit for an externally applied reset. The inputs are edge triggered; that is, the RESET input will initiate a reset timeout after detecting a low to high transition and the RESET# input will initiate a reset timeout after detecting a high to low transition. Refer to the applications Information section for more details on device operation as a reset conditioning circuit.
PIN NAMES SDA SCL RESET & RESET# VSS VCC NC PIN DESCRIPTIONS Serial Clock (SCL) - The SCL input is used to clock data into and out of the device. In the WRITE mode, data must remain stable while SCL is HIGH. In the READ mode, data is clocked out on the falling edge of SCL. Serial Data (SDA) - The SDA pin is a bidirectional pin used to transfer data into and out of the device. Data may change only when SCL is LOW, except START and STOP conditions. is an open-drain output and may be wireORed with any number of open-drain or open-collector outputs. No Connects (NC) the no connect pins may be left floating or tied to ground. They cannot be tied high. Serial Data I/O Serial Clock Input Reset Output Ground Supply Voltage No ConnectFIGURE 1. TYPICAL SYSTEM CONFIGURATION FOR DUAL RESET
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