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DS1321E+T&R

IC CTRL NV W/BATT MON 5V 20TSSOP

Product Category: Memory Controllers
Mfr. Part #
DS1321E+T&R
Manufacturer: Maxim Integrated
Package: 20-TSSOP (0.173", 4.40mm Width)
Lead Free Status /RoHS Status:
Data Sheet: DS1321E+T&R Datasheet
Inventory: In Stock

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Mfr. Part #: DS1321E+T&R

Specifications
Product Details

Specifications

Manufacturer Maxim Integrated

Product Category Memory Controllers

Series DS1321E

Type Non-Volatile SRAM (NVSRAM)

Packaging Tape & Reel (TR) Alternate Packaging

Unit-Weight 0.006737 oz

Mounting-Style SMD/SMT

Package-Case 20-TSSOP (0.173", 4.40mm Width)

Operating-Temperature -40Â°C ~ 85Â°C

Voltage-Supply 4.75 V ~ 5.5 V

Supplier-Device-Package 20-TSSOP

Memory-Type Nonvolatile SRAM

Controller-Type Nonvolatile RAM

Maximum Operating Temperature + 85 C

Operating temperature range - 40 C

Description-Function Converts Full CMOS SRAMs into Nonvolatile Memories

Operating-Supply-Current 50 uA

Battery-Backup-Switching Yes

Part-#-Aliases 90-1321E+T20 DS1321E

Supply-Voltage-Max 5.5 V

Supply-Voltage-Min 4.75 V

Package-Case TSSOP-20

Number-of-Memory-Channels 4 Memory Channels

Lithium-Battery-Monitor Yes

Product Details

DESCRIPTION

The DS1321 Flexible Nonvolatile Controller with Lithium Battery Monitor is a CMOS circuit which solves the application problem of converting CMOS SRAMs into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable outputs are inhibited to accomplish write protection and the battery is switched on to supply the SRAMs with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption. One DS1321 can support as many as four SRAMs arranged in any of three memory configurations.

FEATURES

â– Converts CMOS SRAM into nonvolatile
memory
â– Unconditionally write-protects SRAM when
VCC is out of tolerance
â– Automatically switches to battery backup
supply when VCC power failure occurs
â– Flexible memory organization
- Mode 0: 4 banks with 1 SRAM each
- Mode 1: 2 banks with 2 SRAMs each
- Mode 2: 1 bank with 4 SRAMs each
â– Monitors voltage of a lithium cell and
provides advanced warning of impending
battery failure
â– Signals low-battery condition on active low
Battery Warning output signal
â– Resets processor when power failure occurs
and holds processor in reset during system
power-up
â– Optional 5% or 10% power-fail detection
â– 16-pin PDIP, 16-pin SO and 20-pin TSSOP
packages
â– Industrial temperature range of -40Â°C to
+85Â°C

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Mfr. Part #: DS1321E+T&R