DS1200S+ Maxim Integrated, DS1200S+ Datasheet

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DS1200S+

Manufacturer Part Number
DS1200S+
Description
SRAM
Manufacturer
Maxim Integrated
Series
DS1200r
Datasheet

Specifications of DS1200S+

Rohs
yes
Part # Aliases
90-1200S+000
FEATURES
§ 1024 Bits of Read/Write Memory
§ Low Data Retention Current for Battery
§ Four Million Bits/Second Data Rate
§ Single-Byte or Multiple-Byte Data Transfer
§ No Restrictions on the Number of Write
§ Low-Power CMOS Circuitry
APPLICATIONS
§ Software Authorization
§ Computer Identification
§ System Access Control
§ Secure Personnel Areas
§ Calibration
§ Automatic System Setup
§ Traveling Work Record
DESCRIPTION
The DS1200 serial RAM chip is a miniature read/write memory that can randomly access individual
8-bit strings (bytes) or sequentially access the entire 1024-bit contents (burst). Interface cost to a
microprocessor is minimized by on-chip circuitry, which permits data transfers with only three signals:
CLK, RST , and DQ.
Nonvolatility can be achieved by connecting a battery of 2V to 4V at the battery input V
0.5 mA should be used to size the external battery for the required data retention time. If nonvolatility is
not required the V
www.maxim-ic.com
Backup Applications
Capability
Cycles
BAT
pin should be grounded.
1 of 7
PIN ASSIGNMENT
PIN DESCRIPTION
V
DQ
CLK
GND
V
NC
RST
See Mech. Drawings Section
CC
BAT
16-Pin SO (300mil)
- +5V
- Reset
- Data Input/Output
- Clock
- Ground
- Battery (+)
- No Connection
Serial RAM Chip
BAT.
DS1200
A load of
092702

Related parts for DS1200S+

DS1200S+ Summary of contents

Page 1

FEATURES § 1024 Bits of Read/Write Memory § Low Data Retention Current for Battery Backup Applications § Four Million Bits/Second Data Rate § Single-Byte or Multiple-Byte Data Transfer Capability § No Restrictions on the Number of Write Cycles § ...

Page 2

Figure 1. ELECTRONIC TAG BLOCK DIAGRAM Figure 2. ADDRESS/COMMAND B-BURST BYTE 3 R-READ W-WRITE ...

Page 3

ADDRESS/COMMAND Each memory transfer consists of a 3-byte input called the address/command. The address/command is shown in Figure 2. As defined, the first byte of the address/command specifies whether the memory is written or read. If any one of the ...

Page 4

Figure 3. DATA TRANSFER NOTES: 1) Data input sampled on rising edge of clock cycle. 2) Data output changes on falling edge of clock ...

Page 5

Figure 4. READ/WRITE DATA TRANSFER ...

Page 6

ABSOLUTE MAXIMUM RATING* Voltage Range on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range * This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in ...

Page 7

AC ELECTRICAL CHARACTERISTICS PARAMETER Data to CLK Setup Data to CLK Hold Data to CLK Delay CLK Low Time CLK High Time CLK Frequency CLK Rise and Fall to Clock Setup RST CLK to RST Hold Inactive Time RST to ...

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