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Features
•Write Protect Pin for Hardware Data Protection –Utilizes Different Array Protection Compared to the AT24C02/04/08/16•Medium-voltage and Standard-voltage Operation –5.0 (V CC = 4.5V to 5.5V)–2.7 (V CC = 2.7V to 5.5V)
•Internally Organized 256 x 8 (2K), 512 x 8 (4K), 1024 x 8 (8K) or 2048 x 8 (16K)•Two-wire Serial Interface
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Schmitt Trigger, Filtered Inputs for Noi Suppression •Bidirectional Data Transfer Protocol •400 kHz
(2.7V, 5V) Clock Rate
肖培东•8-byte Page (2K), 16-byte Page (4K, 8K, 16K) Write Modes •Partial Page Writes Allowed
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•Self-timed Write Cycle (5 ms Max)•High Reliability
–Endurance: One Million Write Cycles –Data Retention: 100 Years
•Automotive Grade, Extended Temperature, and Lead-Free/Halogen-Free Devices Available
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8-lead PDIP , 8-lead JEDEC SOIC, and 8-lead TSSOP Packages
Description
The AT24C02A/04A/08A/16A provides 2048/4096/8192/16384 bits of rial electri-cally erasable and programmable read-only memory (EEPROM) organized as 256/512/1024/2048 words of 8 bits each. The device is optimized for u in many automotive applications where low-power and low-voltage operation are esntial.The A T24C02A/04A/08A/16A is available in space-saving 8-lead PDIP , 8-le
ad JEDEC SOIC, and 8-lead TSSOP packages and is accesd via a two-wire rial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) version.Table 1. Pin Configurations
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AT24C02A/04A/08A/16A
5083A–SEEPR–9/04
Figure 1. Block Diagram
Pin Description
SERIAL CLOCK (SCL): The SCL input is ud to positive edge clock data into each EEPROM device and negative edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bidirectional for rial data transfer. This pin is open-drain driven and may be wire-ORed with any number of other open-drain or open-collector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1, and A0 pins are device address inputs that must be hardwired for the AT24C02A. As many as eight 2K devices may be addresd on a single bus system. (Device addressing is discusd in detail under Device Addressing, page 9).
The AT24C04A us the A2 and A1 inputs for hardwire addressing, and a total of four 4K devices may be addresd on a single bus system. The A0 pin is a no-connect.
Absolute Maximum Ratings*
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*NOTICE:
Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent dam-age to the device. This is a stress rating only and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
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AT24C02A/04A/08A/16A成功的因素
5083A–SEEPR–9/04
The AT24C08A only us the A2 input for hardwire addressing, and a total of two 8K devices may be addresd on a single bus system. The A0 and A1 pins are no-connects.
The AT24C16A does not u the device address pins, which limits the number of devices on a single bus to one. The A0, A1, and A2 pins are no-connects.
WRITE PROTECT (WP): The AT24C02A/04A/08A/16A have a WP pin that provides hardware data protection. The WP pin allows normal read/write operations when con-nected to ground (GND). When the WP pin is connected to V CC , the write protection feature is enabled and operates as shown. (See Table 1.)Table 1. Write Protect我想离婚
Memory Organization
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AT24C02A, 2K SERIAL EEPROM: The 2K is internally organized with 32 pages of 8bytes each. Random word addressing requires an 8-bit data word address.
AT24C04A, 4K SERIAL EEPROM: The 4K is internally organized with 32 pages of 16bytes each. Random word addressing requires a 9-bit data word address.
AT24C08A, 8K SERIAL EEPROM: The 8K is internally organized with 64 pages of 16bytes each. Random word addressing requires a 10-bit data word address.
AT24C16A, 16K SERIAL EEPROM: The 16K is internally organized with 128 pages of 16 bytes each. Random word addressing requires an 11-bit data word address.
Note:
This parameter is characterized and is not 100% tested.
Table 2. Pin Capacitance
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AT24C02A/04A/08A/16A
5083A–SEEPR–9/04
Note:
1.V IL min and V IH max are reference only and are not tested.
Table 3. DC Characteristics
Applicable over recommended operating range from: T AE = −40°C to +125°C, V CC = +2.7V to +5.5V
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AT24C02A/04A/08A/16A
5083A–SEEPR–9/04
Note:
1.This parameter is characterized and is not 100% tested (T A = 25°C).
2.This parameter is characterized and is not 100% tested.
Table 4. AC Characteristics
Applicable over recommended operating range from T AE = −40°C to +125°C, V CC = +2.7V to +5.5V, CL = 1 TTL Gate and 100 pF (unless otherwi noted).
