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DS1238A Datasheet PDF

Dallas
Part Number DS1238A
Manufacturer Dallas
Title MicroManager
Description VBAT VCCO VCC GND PF RVT OSCIN OSCSEL IN NMI ST CEO CEI WDS RST RST - +3-Volt Battery Input - Switched SRAM Supply Output - +5-Volt Power Suppl...
Features Holds microprocessor in check during power transients Halts and restarts an out-of-control microprocessor Warns microprocessor of an impending power failure Converts CMOS SRAM into nonvolatile memory Unconditionally write protects memory when power supply is out of tolerance Delays write protection ...

File Size 211.42KB
Datasheet PDF File DS1238A PDF File


DS1238A DS1238A DS1238A




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DS1230AB : 19-5635; Rev 11/10 www.maxim-ic.com DS1230Y/AB 256k Nonvolatile SRAM FEATURES  10 years minimum data retention in the absence of external power  Data is automatically protected during power loss  Replaces 32k x 8 volatile static RAM, EEPROM or Flash memory  Unlimited write cycles  Low-power CMOS  Read and write access times of 70 ns  Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time  Full ±10% VCC operating range (DS1230Y)  Optional ±5% VCC operating range (DS1230AB)  Optional industrial temperature range of -40°C to +85°C, designated IND  JEDEC standard 28-pin DIP package  PowerCap Module (PCM) package - Directly .

DS1230W : A0 - A14 DQ0 - DQ7 CE WE OE VCC GND NC - Address Inputs - Data In/Data Out - Chip Enable - Write Enable - Output Enable - Power (+3.3V) - Ground - No Connect 1 of 11 111899 DS1230W DESCRIPTION The DS1230W 3.3V 256k Nonvolatile SRAM is a 262,144-bit, fully static, nonvolatile SRAM organized as 32,768 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. DIP-package DS1230W devices can be used in place of existing 32k x 8 sta.

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DS1231S : IN MODE TOL GND RST RST NMI VCC NC – – – – – – – – – Input Selects input pin characteristics Selects 5% or 10% VCC detect Ground Reset (Active High) Reset (Active Low, open drain) Non–Maskable Interrupt +5V Supply No Connections DESCRIPTION The DS1231 Power Monitor Chip uses a precise temperature-compensated reference circuit which provides an orderly shutdown and an automatic restart of a processor-based system. A signal warning of an impending power failure is generated well before regulated DC voltages go out of specification by monitoring high voltage inputs to the power supply regulators. If line isolation is required a UL-approved opto-isolator can be directly interfaced to the DS1231.

DS1232 : PBRST TD TOL GND RST - Pushbutton Reset Input - Time Delay Set - Selects 5% or 10% VCC Detect - Ground - Reset Output (Active High) RST - Reset Output (Active Low, open drain) .

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DS1233A : PIN 1 PIN 2 PIN 3 PIN 4 GROUND RESET VCC GROUND (SOT-223 ONLY) DESCRIPTION The DS1233A EconoReset monitors two vital conditions for a microprocessor: power supply and external override. A precision temperature-compensated reference and comparator circuit are used to monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 350ms to allow the power supply and processor to stabilize. The second function of the DS1233A is pushbutton reset control. The DS1233A debounce.

DS1233D : PIN 1 PIN 2 PIN 3 PIN 4 GROUND RESET VCC GROUND (SOT-223 ONLY) DESCRIPTION The DS1233D EconoReset uses a precision temperature-compensated reference and comparator circuit to monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 350 ms to allow the power supply and processor to stabilize. OPERATION - POWER MONITOR The DS1233D provides the functions of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power fai.

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DS1234 : VCCO NC – RAM Supply – No Connection CEI – Chip Enable Input WEI – Write Enable Input CEO – Chip Enable Output to RAM WEO – Write Enable Output to RAM GND – Ground PF – Power Fail Output A0-A3 – Address Inputs VBAT VCCI – Battery Input – +5V Supply DESCRIPTION The DS1234 is a CMOS circuit that converts CMOS RAM into nonvolatile memory and adds two software selectable switches. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable and write enable to the RAM are inhibited to accomplish write protection, and the battery is switched on to supply the memory with uninterrupted power. The two software selectable switches provi.

DS1235AB : .

DS1235Y : .

DS1236 : VBAT VCCO VCC GND PF PF WC/ SC RC IN NMI ST CEO CEI PBRST RST RST - +3-Volt Battery Input - Switched SRAM Supply Output - +5-Volt Power Supply Input - Ground - Power-Fail (Active High) - Power-Fail (Active Low) - Wake-Up Control (Sleep) - Reset Control - Early Warning Input - Non-Maskable Interrupt - Strobe Input - Chip Enable Output - Chip Enable Input - Pushbutton Reset Input - Reset Output (Active Low) - Reset Output (Active High) DESCRIPTION The DS1236 MicroManager Chip provides all the necessary functions for power supply monitoring, reset control, and memory backup in microprocessor-based systems. A precise internal voltage reference and comparator circuit monitor power supply stat.

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