AT24c128-24c256 [serial]AT24c128-24c256 [serial], Elektronika - specyfikacje elementów, Pamięci serial
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Features • Low-voltage and Standard-voltage Operation – 2.7 (V CC = 2.7V to 5.5V) – 1.8 (V CC = 1.8V to 3.6V) Internally Organized 16,384 x 8 and 32,768 x 8 Two-wire Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol 1 MHz (5V), 400 kHz (2.7V, 2.5V) and 100 kHz (1.8V) Compatibility Write Protect Pin for Hardware and Software Data Protection 64-byte Page Write Mode (Partial Page Writes Allowed) Self-timed Write Cycle (5 ms Max) High Reliability – Endurance: One Million Write Cycles – Data Retention: 40 Years Extended Temperature and Lead-free/Halogen-free Devices Available 8-lead JEDEC PDIP, 8-lead JEDEC and EIAJ SOIC, 8-lead MAP, 8-lead TSSOP, 8-lead SAP and 8-ball dBGA2 Packages Die Sales: Wafer Form, Waffle Pack, and Bumped Wafers Two-wire Serial EEPROMs 128K (16,384 x 8) 256K (32,768 x 8) Description The AT24C128/256 provides 131,072/262,144 bits of serial electrically erasable and programmable read only memory (EEPROM) organized as 16,384/32,768 words of 8 bits each. The device’s cascadable feature allows up to 4 devices to share a common Two-wire bus. The device is optimized for use in many industrial and commercial appli- cations where low power and low voltage operation are essential. The devices are available in space-saving 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead EIAJ SOIC, 8-lead MAP (24C128), 8-lead TSSOP, 8-lead SOIC Array Package and 8-ball dBGA2 packages. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 3.6V) versions. AT24C128 (1) AT24C256 (2) Notes: 1. Not recommended for new design; please refer to AT24C128B datasheet. 2. Not recommended for new design; please refer to AT24C256B datasheet. 8-lead PDIP 8-lead TSSOP Table 1. Pin Configuration Pin Name Function A0 A1 NC GND 1 2 3 4 8 7 6 5 VCC WP SCL SDA A0 A1 NC GND 1 2 3 4 8 7 6 5 VCC WP SCL SDA A0 - A1 Address Inputs SDA Serial Data SCL Serial Clock Input 8-lead SOIC WP Write Protect 8-lead MAP NC No Connect A0 A1 NC GND 1 2 3 4 8 7 6 5 VCC WP SCL SDA VCC WP SCL SDA 8 7 6 5 1 2 3 4 A0 A1 NC GND GND Ground Bottom View 8-ball dBGA2 8-lead SAP VCC WP SCL SDA 8 7 6 5 1 2 3 4 A0 A1 NC GND VCC WP SCL SDA 8 7 6 5 1 2 3 4 A0 A1 NC GND Bottom View Bottom View 0670T–SEEPR–3/07 1 Absolute Maximum Ratings* Operating Temperature.................................–55 ° C to +125 ° C *NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent dam- age to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Storage Temperature ....................................–65 ° C to +150 ° C Voltage on Any Pin with Respect to Ground .................................... –1.0V to +7.0V Maximum Operating Voltage .......................................... 6.25V DC Output Current........................................................ 5.0 mA Figure 1. Block Diagram 2 AT24C128/256 0670T–SEEPR–3/07 AT24C128/256 Pin Description SERIAL CLOCK (SCL): The SCL input is used 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 serial 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/ADDRESSES (A1, A0): The A1 and A0 pins are device address inputs that are hard- wired or left not connected for hardware compatibility with other AT24CXX devices. When the pins are hardwired, as many as four 128K/256K devices may be addressed on a single bus system (device addressing is discussed in detail under the Device Addressing section). If the pins are left floating, the A1 and A0 pins will be internally pulled down to GND if the capacitive coupling to the circuit board V CC plane is <3 pF. If coupling is >3 pF, Atmel recommends con- necting the address pins to GND. WRITE PROTECT (WP): The write protect input, when connected to GND, allows normal write operations. When WP is connected high to V CC , all write operations to the memory are inhib- ited. If the pin is left floating, the WP pin will be internally pulled down to GND if the capacitive coupling to the circuit board V CC plane is <3 pF. If coupling is >3 pF, Atmel recommends con- necting the pin to GND. Memory Organization AT24C128/256, 128K/256K SERIAL EEPROM: The 128K/256K is internally organized as 256/512 pages of 64-bytes each. Random word addressing requires a 14/15-bit data word address. 3 0670T–SEEPR–3/07 Table 2. Pin Capacitance (1) Applicable over recommended operating range from T A = 25 ° C, f = 1.0 MHz, V CC = +1.8V. Symbol Test Condition Max Units Conditions C I/O Input/Output Capacitance (SDA) 8 pF V I/O = 0V C IN Input Capacitance (A 0 , A 1 , SCL) 6 pF V IN = 0V Note: 1. This parameter is characterized and is not 100% tested. Table 3. DC Characteristics (1) Applicable over recommended operating range from: T AI = – 40 ° C to +85 ° C, V CC = +1.8V to +5.5V; T AE = – 40 ° C to C (2) , V CC = +2.7V to +5.5V(unless otherwise noted). Symbol ° Parameter Test Condition Min Typ Max Units V CC1 Supply Voltage 1.8 3.6 V V CC2 Supply Voltage 2.5 5.5 V V CC3 Supply Voltage 4.5 5.5 V I CC1 Supply Current V CC = 5.0V READ at 400 kHz 1.0 2.0 mA I CC2 Supply Current V CC = 5.0V WRITE at 400 kHz 2.0 3.0 mA I SB1 Standby Current (1.8V option) V CC = 1.8V V IN = V CC or V SS 0.2 µA V CC = 3.6V 2.0 I SB2 Standby Current (2.5V option) V CC = 2.5V V IN = V CC or V SS 0.5 µA V CC = 5.5V 6.0 I SB3 Standby Current (5.0V option) V CC = 4.5 - 5.5V V IN = V CC or V SS 6.0 µA I LI Input Leakage Current V IN = V CC or V SS 0.10 3.0 µA I LO Output Leakage Current V OUT = V CC or V SS 0.05 3.0 µA V IL Input Low Level (1) –0.6 V CC x 0.3 V V IH Input High Level (1) V CC x 0.7 V CC + 0.5 V V OL2 Output Low Level V CC = 3.0V I OL = 2.1 mA 0.4 V V OL1 Output Low Level V CC = 1.8V I OL = 0.15 mA 0.2 V Notes: 1. V IL min and V IH max are reference only and are not tested. 2. The AT24C128/256 bearing the process letter “B” on the package (the mark is located in the lower right corner on the top- side of the package) are approved for operation in the extended temperature range. 4 AT24C128/256 0670T–SEEPR–3/07 +125 AT24C128/256 Table 4. AC Characteristics – Industrial Temperatures Applicable over recommended operating range from T AI = – 40 ° C to +85 ° C, V CC = +1.8V to +5.5V, CL = 100 pF (unless oth- erwise noted). Test conditions are listed in Note 2. 1.8-volt 2.5-volt 5.0-volt Symbol Parameter Min Max Min Max Min Max Units f SCL Clock Frequency, SCL 100 400 1000 kHz t LOW Clock Pulse Width Low 4.7 1.3 0.4 µs t HIGH Clock Pulse Width High 4.0 0.6 0.4 µs t AA Clock Low to Data Out Valid 0.1 4.5 0.05 0.9 0.05 0.55 µs t BUF Time the bus must be free before a new transmission can start (1) 4.7 1.3 0.5 µs t HD.STA Start Hold Time 4.0 0.6 0.25 µs t SU.STA Start Set-up Time 4.7 0.6 0.25 µs t HD.DAT Data In Hold Time 0 0 0 µs t SU.DAT Data In Set-up Time 200 100 100 ns t R Inputs Rise Time (1) 1.0 0.3 0.3 µs t F Inputs Fall Time (1) 300 300 100 ns t SU.STO Stop Set-up Time 4.7 0.6 0.25 µs t DH Data Out Hold Time 100 50 50 ns t WR Write Cycle Time 20 or 5 (3) 10 or 5 (3) 10 or 5 (3) ms Endurance (1) 25°C, Page Mode 100k or 1,000,000 (4) Write Cycles Notes: 1. This parameter is characterized and is not 100% tested. 2. AC measurement conditions: R L (connects to V CC ): 1.3 k Ω (2.5V, 5V), 10 k Ω (1.8V) Input pulse voltages: 0.3 V CC to 0.7 V CC Input rise and fall times: ≤ 50 ns Input and output timing reference voltages: 0.5 V CC 3. The Write Cycle Time of 5 ms only applies to the AT24C128/256 devices bearing the process letter “B” on the package (the mark is located in the lower right corner on the top side of the package). 4. The AT24C128/256 bearing the process letter “B” in the package (the mark is located in the lower right corner on the top side of the package), guarantees 1 million write cycle endurance (1.8 – 3.6V). 5 0670T–SEEPR–3/07 [ Pobierz całość w formacie PDF ] |
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