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DS2227
Flexible NV SRAM Stik
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Status
Active: In Production.
Description
The DS2227 combines voltage monitoring circuitry with lithium-backed memory in a flexible architecture that can be accessed as 128k x 32, 256k x 16, or 512k x 8 bits.
Using precise comparators, the DS2227 monitors incoming Vcc for an out-or-tolerance condition. When such a condition occurs, the internal lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption.
While the DS2227 is used like a standard static RAM, it can be flexibly configured by virtue of separate read, write, and chip-select bits for each of the four memory banks.
Dallas' nonvolatile memory chips are known throughout the industry for low-power consumption. They render data nonvolatile for greater than 10 years in the absence of power, greater than the useful like of the associated equipment.
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Data Sheet
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Key Features
- Memory with flexible architecture:
- 128k x 32
- 256k x 16
- 512k x 8
- NV circuitry transparent to/independent of host
- Automatic write protection circuitry
- Separate chip-enables for access by byte, word, or long word
- Access times: 70ns, 100ns, or 120ns
- Unlimited write cycles
- Equal read/write cycle times
- JEDEC-standard 72-position SIMM connection
- Lithium source with freshness seal
- Operating ranges:
- 5V±10% tolerance
- 0°C to 70°C
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Key Specifications:
| Memory (EPROM, EEPROM, ROM, NV SRAM) |
| Part Number |
Memory Type |
Memory Size |
Bus Type |
Real Time Clock |
DIP w/Int. Batt. |
Pwr. Cap Pckg. |
Battery Monitor |
GPIO |
VSUPPLY
(V) |
VSUPPLY
(V) |
| min |
max |
| DS2227 |
NV SRAM |
| 128K x 32 | | 256K x 16 | | 512K x 8 |
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Parallel |
No |
No |
No |
No |
No |
4.5 |
5.5 |
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See All Memory (EPROM, EEPROM, ROM, NV SRAM) (58)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Pin Assignment
Application Notes
Reliability Reports
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Software/Models
Ordering Information
This product cannot be purchased through our web site. Contact factory for availability.
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Rev 1;
1999-11-20
This page last modified: 2009-10-28
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