SPI Serial EEPROM AT25010A AT25020A AT25040A. Not Recommended for New Design

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1 Features Serial Peripheral Interface (SPI) Compatible Supports SPI Modes (,) and 3 (1,1) Data Sheet Describes Mode Operation Low-voltage and Standard-voltage Operation 2.7 (V CC = 2.7V to 5.5V) 1.8 (V CC = 1.8V to 5.5V) 2 MHz Clock Rate (5V) 8-byte Page Mode Block Write Protection Protect 1/4, 1/2, or Entire Array Write Protect (WP) Pin and Write Disable Itructio for Both Hardware and Software Data Protection Self-timed Write Cycle (5 ms max) High Reliability Endurance: One Million Write Cycles Data Retention: 1 Years Automotive Devices Available 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead Ultra Thin mini-map (MLP 2x3) and 8- lead TSSOP Packages Die Sales: Wafer Form, Waffle Pack, Bumped Wafers Description The AT251A/2A/4A provides 124/248/496 bits of serial electrically erasable programmable read-only memory (EEPROM) organized as 128/256/512 words of 8 bits each. The device is optimized for use in many industrial and commercial applicatio where low-power and low-voltage operation are essential. The AT251A/2A/4A is available in space saving 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead Ultra Thin mini-map (MLP 2x3), and 8-lead TSSOP packages. The AT251A/2A/4A is enabled through the Chip Select pin (CS) and accessed via a three-wire interface coisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All programming cycles are completely self-timed, and no separate erase cycle is required before write. Block write protection is enabled by programming the status register with one of four blocks of write protection. Separate Program Enable and Program disable itructio are provided for additional data protection. Hardware data protection is provided via the WP pin to protect agait inadvertent write attempts. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence. Table 1. Pin Configuration Pin Name CS SCK SI Function Chip Select Serial Data Clock Serial Data Input CS SO WP GND 8-lead PDIP VCC HOLD SCK SI CS SO W P G N D 8-lead SOIC VCC HOL SCK SI SPI Serial EEPROM 1K (128x8) 2K (256x8) 4K (512x8) AT251A AT252A AT254A Not Recommended for New Design SO Serial Data Output 8-lead Ultra Thin mini-map (MLP 2x3) 8-lead TSSOP GND VCC WP Ground Power Supply Write Protect VCC 8 HOLD 7 SCK 6 SI 5 1 CS 2 SO 3 WP 4 GND CS SO W P G N D VCC HOL SCK SI HOLD Suspends Serial Input Bottom view

2 Absolute Maximum Ratings* Operating Temperature 4 C to C Storage Temperature 65 C to + 15 C Voltage on Any Pin with Respect to Ground 1.V to + 7.V Maximum Operating Voltage V *NOTICE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditio beyond those indicated in the operational sectio of this specification is not implied. Exposure to absolute maximum rating conditio for extended periods may affect device reliability. DC Output Current ma Figure 1. Block Diagram STATUS REGISTER MEMORY ARRAY 128/256/512 X 8 ADDRESS DECODER DATA REGISTER MODE DECODE LOGIC OUTPUT BUFFER CLOCK GENERATOR 2 AT251A/2A/4A

3 AT251A/2A/4A Table 2. Pin Capacitance (1) Applicable over recommended operating range from T A = 25 C, f = 1. MHz, V CC = +5.V (unless otherwise noted) Symbol Test Conditio Max Units Conditio C OUT Output Capacitance (SO) 8 pf V OUT =V C IN Input Capacitance (CS, SCK, SI, WP, HOLD) 6 pf V IN =V Note: 1. This parameter is characterized and is not 1% tested. Table 3. DC Characteristics (1) Applicable over recommended operating range from: T AI = 4 Cto+85 C, V CC = +1.8V to +5.5V, (unless otherwise noted) Symbol Parameter Test Condition Min Typ Max Units V CC1 Supply Voltage V V CC2 Supply Voltage V V CC3 Supply Voltage V I CC1 Supply Current V CC = 5.V at 2 MHz, SO = Open, Read ma I CC2 Supply Current V CC = 5.V at 1 MHz, SO = Open, Read, Write ma I CC3 Supply Current V CC = 5.V at 1 MHz, SO = Open, Read, Write ma I SB1 Standby Current V CC = 1.8V, CS = V CC.1.5 µa I SB2 Standby Current V CC = 2.7V, CS = V CC.2 1. µa I SB3 Standby Current V CC = 5.V, CS = V CC µa I IL Input Leakage V IN =VtoV CC 3. µa I OL Output Leakage V IN =VtoV CC,T AC = C to 7 C µa V IL (1) V IH (1) Input Low-voltage.6 V CC x.3 Input High-voltage V CC x.7 V CC +.5 V OL1 Output Low-voltage I OL = 3. ma.4 V 3.6V V CC 5.5V V OH1 Output High-voltage I OH = 1.6 ma V CC.8 V V OL2 Output Low-voltage I OL =.15 ma.2 V 1.8V V CC 3.6V V OH2 Output High-voltage I OH = 1 µa V CC.2 V Note: 1. V IL min and V IH max are reference only and are not tested. V V 3

4 Table 4. AC Characteristics Applicable over recommended operating range from T AI = 4 to +85 C, V CC = As Specified, CL = 1 TTL Gate and 3 pf (unless otherwise noted) Symbol Parameter Voltage Min Max Units f SCK SCK Clock Frequency MHz t RI Input Rise Time µs t FI Input Fall Time µs t WH SCK High Time t WL SCK Low Time t CS CS High Time t CSS CS Setup Time t CSH CS Hold Time t SU Data In Setup Time t H Data In Hold Time t HD Hold Setup Time t CD Hold Hold Time t V Output Valid t HO Output Hold Time AT251A/2A/4A

5 AT251A/2A/4A Table 4. AC Characteristics (Continued) Applicable over recommended operating range from T AI = 4 to +85 C, V CC = As Specified, CL = 1 TTL Gate and 3 pf (unless otherwise noted) Symbol Parameter Voltage Min Max Units t LZ t HZ t DIS t WC Hold to Output Low Z Hold to Output High Z Output Disable Time Write Cycle Time Note: 1. This parameter is characterized and is not 1% tested Endurance (1) 5.V, 25 C, Page Mode 1M Write Cycles ms 5

6 Serial Interface Description MASTER: The device that generates the serial clock. SLAVE: Because the serial clock pin (SCK) is always an input, the AT251A/2A/4A always operates as a slave. TRANSMITTER/RECEIVER: The AT251A/2A/4A has separate pi designated for data tramission (SO) and reception (SI). MSB: The Most Significant Bit (MSB) is the first bit tramitted and received. SERIAL OP-CODE: After the device is selected with CS going low, the first byte will be received. This byte contai the op-code that defines the operatio to be performed. The op-code also contai address bit A8 in both the read and write itructio. INVALID OP-CODE: If an invalid op-code is received, no data will be shifted into the AT251A/2A/4A, and the serial output pin (SO) will remain in a high impedance state until the falling edge of CS is detected again. This will reinitialize the serial communication. CHIP SELECT: The AT251A/2A/4A is selected when the CS pin is low. When the device is not selected, data will not be accepted via the SI pin, and the SO pin will remain in a high impedance state. HOLD: The HOLD pin is used in conjunction with the CS pin to select the AT251A/2A/4A. When the device is selected and a serial sequence is underway, HOLD can be used to pause the serial communication with the master device without resetting the serial sequence. To pause, the HOLD pin must be brought low while the SCK pin is low. To resume serial communication, the HOLD pin is brought high while the SCK pin is low (SCK may still toggle during HOLD). Inputs to the SI pin will be ignored while the SO pin is in the high impedance state. WRITE PROTECT: The write protect pin (WP) will allow normal read/write operatio when held high. When the WP pin is brought low, all write operatio are inhibited. WP going low while CS is still low will interrupt a write to the AT251A/2A/4A. If the internal write cycle has already been initiated, WP going low will have no effect on any write operation. 6 AT251A/2A/4A

7 AT251A/2A/4A Figure 2. SPI Serial Interface AT251A/2A/4A 7

8 Functional Description The AT251A/2A/4A is designed to interface directly with the synchronous serial peripheral interface (SPI) of the 685 and 68HC11 series of microcontrollers. The AT251A/2A/4A utilizes an 8-bit itruction register. The list of itructio and their operation codes are contained in Figure 5. All itructio, addresses, and data are traferred with the MSB first and start with a high-to-low CS traition. Table 5. Itruction Set for the AT251A/2A/4A Itruction Name Itruction Format Operation WREN X11 Set Write Enable Latch WRDI X1 Reset Write Enable Latch RDSR X11 Read Status Register WRSR X1 Write Status Register READ A11 Read Data from Memory Array WRITE A1 Write Data to Memory Array Note: A represents MSB address bit A8. WRITE ENABLE (WREN): The device will power up in the write disable state when V CC is applied. All programming itructio must therefore be preceded by a Write Enable itruction. The WP pin must be held high during a WREN itruction. WRITE DISABLE (WRDI): To protect the device agait inadvertent writes, the Write Disable itruction disables all programming modes. The WRDI itruction is independent of the status of the WP pin. READ STATUS REGISTER (RDSR): The Read Status Register itruction provides access to the status register. The read/busy and write enable status of the device can be determined by the RDSR itruction. Similarly, the block write protection bits indicate the extent of protection employed. These bits are set by using the WRSR itruction. Table 6. Status Register Format Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit X X X X BP1 BP WEN RDY Table 7. Read Status Register Bit Definition Bit Bit(RDY) Bit 1 (WEN) Definition Bit 2 (BP) See Table 8. Bit 3 (BP1) See Table 8. Bit = (RDY) indicates the device is ready. Bit = 1 indicates the write cycle is in progress. Bit 1 = indicates the device is not write enabled. Bit 1 = 1 indicates the device is write enabled. Bits 4 7 are s when device is not in an internal write cycle. Bits 7 are 1 s during an internal write cycle. WRITE STATUS REGISTER (WRSR): The WRSR itruction allows the user to select one of four levels of protection. The AT251A/2A/4A is divided into four array segments. One-quarter, one-half, or all of the memory segments can be protected. Any of 8 AT251A/2A/4A

9 AT251A/2A/4A the data within any selected segment will therefore be read only. The block write protection levels and corresponding status register control bits are shown in Table 8. Bits BP1 and BP are nonvolatile cells that have the same properties and functio as the regular memory cells (e.g., WREN, t WC, RDSR). Table 8. Block Write Protect Bits Level Status Register Bits Array Addresses Protected BP1 BP AT251A AT252A AT254A None None None 1 (1/4) 1 6 7F C FF 18 FF 2 (1/2) 1 4 7F 8 FF 1 1FF 3 (All) 1 1 7F FF 1FF READ SEQUENCE (READ): Reading the AT251A/2A/4A via the SO pin requires the following sequence. After the CS line is pulled low to select a device, the read op-code (including A8) is tramitted via the SI line followed by the byte address to be read (A7 A). Upon completion, any data on the SI line will be ignored. The data (D7 D) at the specified address is then shifted out onto the SO line. If only one byte is to be read, the CS line should be driven high after the data comes out. The read sequence can be continued since the byte address is automatically incremented and data will continue to be shifted out. When the highest address is reached, the address counter will roll over to the lowest address allowing the entire memory to be read in one continuous read cycle. WRITE SEQUENCE (WRITE): In order to program the AT251A/2A/4A, the Write Protect pin (WP) must be held high and two separate itructio must be executed. First, the device must be write enabled via the WREN itruction. Then a Write (WRITE) itruction may be executed. Also, the address of the memory location(s) to be programmed must be outside the protected address field location selected by the block write protection level. During an internal write cycle, all commands will be ignored except the RDSR itruction. A Write itruction requires the following sequence. After the CS line is pulled low to select the device, the WRITE op-code (including A8) is tramitted via the SI line followed by the byte address (A7 A) and the data (D7 D) to be programmed. Programming will start after the CS pin is brought high. The low-to-high traition of the CS pin must occur during the SCK low time immediately after clocking in the D (LSB) data bit. The ready/busy status of the device can be determined by initiating a Read Status Register (RDSR) itruction. If Bit = 1, the write cycle is still in progress. If Bit =, the write cycle has ended. Only the RDSR itruction is enabled during the write programming cycle. The AT251A/2A/4A is capable of an 8-byte page write operation. After each byte of data is received, the three low-order address bits are internally incremented by one; the six high-order bits of the address will remain cotant. If more than 8 bytes of data are tramitted, the address counter will roll over and the previously written data will be overwritten. The AT251A/2A/4A is automatically returned to the write disable state at the completion of a write cycle. NOTE: If the WP pin is brought low or if the device is not write enabled (WREN), the device will ignore the Write itruction and will return to the standby state, when CS is brought high. A new CS falling edge is required to reinitiate the serial communication. 9

10 Timing Diagrams Figure 3. Synchronous Data Timing (for Mode ) t CS CS V IH V IL tcss t CSH SCK V IH t WH t WL V IL t SU t H SI V IH V IL VALID IN t V t HO t DIS SO V OH HI-Z HI-Z V OL Figure 4. WREN Timing Figure 5. WRDI Timing 1 AT251A/2A/4A

11 AT251A/2A/4A Figure 6. RDSR Timing CS SCK SI INSTRUCTION DATA OUT HIGH IMPEDANCE SO MSB Figure 7. WRSR Timing CS SCK SI INSTRUCTION DATA IN SO HIGH IMPEDANCE Figure 8. READ Timing 11

12 Figure 9. WRITE Timing CS SCK SI INSTRUCTION BYTE ADDRESS TH BIT OF ADDRESS DATA IN SO HIGH IMPEDANCE Figure 1. HOLD Timing CS t CD t CD SCK t HD HOLD t HD t HZ SO t LZ 12 AT251A/2A/4A

13 AT251A/2A/4A AT251A Ordering Information (1) Ordering Code Package Operation Range AT251A-1PU-2.7 (2) AT251A-1PU-1.8 (2) AT251AN-1SU-2.7 (2) AT251AN-1SU-1.8 (2) AT251A-1TU-2.7 (2) AT251A-1TU-1.8 (2) AT251AY1-1YU-1.8 (2) (Not recommended for new desig) AT251AY6-1YH-1.8 (3) 8P3 8P3 8S1 8S1 8A2 8A2 8Y1 8Y6 Lead-free/Halogen-free/ Industrial Temperature ( 4 to 85 C) AT251A-W (4) Die Sale Industrial Temperature ( 4 to 85 C) Notes: 1. For 2.7V devices used in the 4.5 to 5.5V range, please refer to performance values in Table on page 3 and Table 4 on page U designates Green Package + RoHS compliant. 3. H designates Green Package + RoHS compliant, with NiPdAu Lead Finish. 4. Available in waffle pack and wafer form; order as SL788 for inkless wafer form. Bumped die available upon request. Please contact Serial EEPROM Marketing. Package Type 8P3 8-lead,.3" Wide, Plastic Dual Inline Package (PDIP) 8S1 8-lead,.15" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC) 8A2 8-lead,.17" Wide, Thin Shrink Small Outline Package (TSSOP) 8Y1 8-lead, 4.9 mm x 3. mm Body, Dual Footprint, Non-leaded, Miniature Array Package (MAP) 8Y6 8-lead, 2.mm x 3.mm Body,.5 mm Pitch, Ultra Thin Mini-MAP, Dual No Lead Package (DFN), (MLP 2x3 mm) Optio 2.7 Low Voltage (2.7 to 5.5V) 1.8 Low Voltage (1.8 to 5.5V) 13

14 AT252A Ordering Information (1) Ordering Code Package Operation Range AT252A-1PU-2.7 (2) AT252A-1PU-1.8 (2) AT252AN-1SU-2.7 (2) AT252AN-1SU-1.8 (2) AT252A-1TU-2.7 (2) AT252A-1TU-1.8 (2) AT252AY1-1YU-1.8 (2) (Not recommended for new desig) AT252AY6-1YH-1.8 (3) AT252A-W (4) Notes: 1. For 2.7V devices used in the 4.5 to 5.5V range, please refer to performance values in Table on page 3 and Table 4 on page U designates Green Package + RoHS compliant. 3. H designates Green Package + RoHS compliant, with NiPdAu Lead Finish. 4. Available in waffle pack and wafer form; order as SL788 for inkless wafer form. Bumped die available upon request. Please contact Serial EEPROM Marketing. 8P3 8P3 8S1 8S1 8A2 8A2 8Y1 8Y6 Die Sale Lead-free/Halogen-free/ Industrial Temperature ( 4 to 85 C) Industrial Temperature ( 4 to 85 C) Package Type 8P3 8-lead,.3" Wide, Plastic Dual Inline Package (PDIP) 8S1 8-lead,.15" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC) 8A2 8-lead,.17" Wide, Thin Shrink Small Outline Package (TSSOP) 8Y1 8-lead, 4.9 mm x 3. mm Body, Dual Footprint, Non-leaded, Miniature Array Package (MAP) 8Y6 8-lead, 2.mm x 3.mm Body,.5 mm Pitch, Ultra Thin Mini-MAP, Dual No Lead Package (DFN), (MLP 2x3 mm) Optio 2.7 Low Voltage (2.7 to 5.5V) 1.8 Low Voltage (1.8 to 5.5V) 14 AT251A/2A/4A

15 AT251A/2A/4A AT254A Ordering Information Ordering Code Package Operation Range AT254A-1PU-2.7 (2) AT254A-1PU-1.8 (2) AT254AN-1SU-2.7 (2) AT254AN-1SU-1.8 (2) AT254A-1TU-2.7 (2) AT254A-1TU-1.8 (2) AT254AY1-1YU-1.8 (2) (Not recommended for new desig) AT254AY6-1YH-1.8 (3) AT254A-W (4) Notes: 1. For 2.7V devices used in the 4.5 to 5.5V range, please refer to performance values in Table on page 3 and Table 4 on page U designates Green Package + RoHS compliant. 3. H designates Green Package + RoHS compliant, with NiPdAu Lead Finish. 4. Available in waffle pack and wafer form; order as SL788 for inkless wafer form. Bumped die available upon request. Please contact Serial EEPROM Marketing. 8P3 8P3 8S1 8S1 8A2 8A2 8Y1 8Y6 Die Sale Lead-free/Halogen-free/ Industrial Temperature ( 4 to 85 C) Industrial Temperature ( 4 to 85 C) Package Type 8P3 8-lead,.3" Wide, Plastic Dual Inline Package (PDIP) 8S1 8-lead,.15" Wide, Plastic Gull Wing Small Outline Package (JEDEC SOIC) 8A2 8-lead,.17" Wide, Thin Shrink Small Outline Package (TSSOP) 8Y1 8-lead, 4.9 mm x 3. mm Body, Dual Footprint, Non-leaded, Miniature Array Package (MAP) 8Y6 8-lead, 2.mm x 3.mm Body,.5 mm Pitch, Ultra Thin Mini-MAP, Dual No Lead Package (DFN), (MLP 2x3 mm) Optio 2.7 Low Voltage (2.7 to 5.5V) 1.8 Low Voltage (1.8 to 5.5V) 15

16 Packaging Information 8P3 PDIP 1 E E1 N Top View c ea End View D1 D e A2 A COMMON DIMENSIONS (Unit of Measure = inches) SYMBOL MIN NOM MAX NOTE A.21 2 A b b b c b3 4 PLCS b2 b L D D1.5 3 E E Side View e.1 BSC ea.3 BSC 4 L Notes: R 1. This drawing is for general information only; refer to JEDEC Drawing MS-1, Variation BA, for additional information. 2. Dimeio A and L are measured with the package seated in JEDEC seating plane Gauge GS D, D1 and E1 dimeio do not include mold Flash or protrusio. Mold Flash or protrusio shall not exceed.1 inch. 4. E and ea measured with the leads cotrained to be perpendicular to datum. 5. Pointed or rounded lead tips are preferred to ease iertion. 6. b2 and b3 maximum dimeio do not include Dambar protrusio. Dambar protrusio shall not exceed.1 (.25 mm) Orchard Parkway San Jose, CA TITLE 8P3, 8-lead,.3" Wide Body, Plastic Dual In-line Package (PDIP) 1/9/2 DRAWING NO. REV. 8P3 B 16 AT251A/2A/4A

17 AT251A/2A/4A 8S1 JEDEC SOIC C 1 E E1 N L Top View End View e B A COMMON DIMENSIONS (Unit of Measure = mm) D Side View A1 SYMBOL MIN NOM MAX NOTE A A b C D E E e 1.27 BSC L Note: These drawings are for general information only. Refer to JEDEC Drawing MS-12, Variation AA for proper dimeio, tolerances, datums, etc. 1/7/3 R 115 E. Cheyenne Mtn. Blvd. Colorado Springs, CO 896 TITLE 8S1, 8-lead (.15" Wide Body), Plastic Gull Wing Small Outline (JEDEC SOIC) DRAWING NO. 8S1 REV. B 17

18 8A2 TSSOP Pin 1 indicator this corner E1 E L1 N Top View L End View b e D Side View A2 A COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL MIN NOM MAX NOTE D , 5 E 6.4 BSC E , 5 A 1.2 A b e.65 BSC L L1 1. REF Notes: 1. This drawing is for general information only. Refer to JEDEC Drawing MO-153, Variation AA, for proper dimeio, tolerances, datums, etc. 2. Dimeion D does not include mold Flash, protrusio or gate burrs. Mold Flash, protrusio and gate burrs shall not exceed.15 mm (.6 in) per side. 3. Dimeion E1 does not include inter-lead Flash or protrusio. Inter-lead Flash and protrusio shall not exceed.25 mm (.1 in) per side. 4. Dimeion b does not include Dambar protrusion. Allowable Dambar protrusion shall be.8 mm total in excess of the b dimeion at maximum material condition. Dambar cannot be located on the lower radius of the foot. Minimum space between protrusion and adjacent lead is.7 mm. 5. Dimeion D and E1 to be determined at Datum Plane H. 5/3/2 R 2325 Orchard Parkway San Jose, CA TITLE 8A2, 8-lead, 4.4 mm Body, Plastic Thin Shrink Small Outline Package (TSSOP) DRAWING NO. 8A2 REV. B 18 AT251A/2A/4A

19 AT251A/2A/4A 8Y1 MAP PIN 1 INDEX AREA A PIN 1 INDEX AREA E1 D D1 L E A1 b e Top View End View Bottom View Side View A COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL MIN NOM MAX NOTE A.9 A1..5 D E D E b e.65 TYP L /28/3 R 2325 Orchard Parkway San Jose, CA TITLE 8Y1, 8-lead (4.9 x 3. mm Body) MSOP Array Package (MAP) Y1 DRAWING NO. 8Y1 REV. C 19

20 8Y6 - Mini-Map A D2 b (8X) Pin 1 Index Area E E2 Pin 1 ID L (8X) D A2 A1 e (6X) 1.5 REF. A3 COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL MIN NOM MAX NOTE D 2. BSC E 3. BSC D E A A A A3.2 REF L e.5 BSC b Notes: 1. This drawing is for general information only. Refer to JEDEC Drawing MO-229, for proper dimeio, tolerances, datums, etc. 2. Dimeion b applies to metallized terminal and is measured between.15 mm and.3 mm from the terminal tip. If the terminal has the optional radius on the other end of the terminal, the dimeion should not be measured in that radius area. 8/26/5 R 2325 Orchard Parkway San Jose, CA TITLE 8Y6, 8-lead 2. x 3. mm Body,.5 mm Pitch, Utlra Thin Mini-Map, Dual No Lead Package (DFN),(MLP 2x3) DRAWING NO. 8Y6 REV. C 2 AT251A/2A/4A

21 AT251A/2A/4A Revision History Doc. Rev. 3348J Comments Revision History implemented; Added ordering codes for At252A and AT254A. 21

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23 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Microchip: AT251A-1PU-1.8 AT251A-1PU-2.7 AT251A-1TU-1.8 AT251A-1TU-2.7 AT251AN-1SU-1.8 AT251AN-1SU-2.7 AT251AY6-1YH-1.8 AT252A-1TU-1.8 AT252A-1TU-2.7 AT252AN-1SU-1.8 AT252AN-1SU-2.7 AT252AY1-1YU-1.8 AT252AY6-1YH-1.8 AT254A-1TU-1.8 AT254A-1TU-2.7 AT254AN-1SU-1.8 AT254AN-1SU-2.7 AT254AY6-1YH-1.8