Features (cid:129) Fast read access time – 45ns (cid:129) Low-power CMOS operation – 100µA max standby – 20mA max active at 5MHz (cid:129) JEDEC standard packages – 28-lead PDIP – 32-lead PLCC (cid:129) 5V±10% supply 256K (32K x 8) (cid:129) High reliability CMOS technology One-time – 2,000V ESD protection Programmable, – 200mA latchup immunity (cid:129) Rapid programming algorithm – 100µs/byte (typical) Read-only Memory (cid:129) CMOS- and TTL-compatible inputs and outputs (cid:129) Integrated product identification code (cid:129) Industrial and automotive temperature ranges Atmel AT27C256R (cid:129) Green (Pb/halide-free) packaging option 1. Description The Atmel® AT27C256R is a low-power, high-performance, 262,144-bit, one-time pro- grammable, read-only memory (OTP EPROM) organized as 32K by 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 45ns, eliminating the need for speed reducing WAIT states on high-performance micropro- cessor systems. The Atmel scaled CMOS technology provides low active power consumption and fast pro- gramming. Power consumption is typically only 8mA in active mode and less than 10µA in standby mode. The AT27C256R is available in a choice of industry-standard, JEDEC-approved, one-time programmable (OTP) PDIP and PLCC packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention. With 32K byte storage capability, the AT27C256R allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media. The AT27C256R has additional features to ensure high quality and efficient production use. The rapid programming algorithm reduces the time required to program the part and guar- antees reliable programming. Programming time is typically only 100µs/byte. The integrated product identification code electronically identifies the device and manufacturer. This feature is used by industry-standard programming equipment to select the proper pro- gramming algorithms and voltages. 0014O–EPROM–10/11

2. Pin configurations 32-lead PLCC 28-lead PDIP Pin name Function Top view Top view A0 - A14 Addresses 7 12 PP C CC 14 13 O0 - O7 Outputs A A V N V A A VPP 1 28 VCC CE Chip enable 4 3 2 1 32 31 30 A12 2 27 A14 A6 5 29 A8 A7 3 26 A13 OE Output enable A5 6 28 A9 A6 4 25 A8 A4 7 27 A11 A5 5 24 A9 NC No connect A3 8 26 NC A4 6 23 A11 A2 9 25 OE A3 7 22 OE A1 10 24 A10 A2 8 21 A10 A0 11 23 CE A1 9 20 CE NC 12 22 O7 A0 10 19 O7 O0 13 21 O6 O0 11 18 O6 4 5 6 7 8 9 0 1 1 1 1 1 1 2 O1 12 17 O5 1 2 D C 3 4 5 O2 13 16 O4 O O N N O O O G GND 14 15 O3 Note: PLCC package pins 1 and 17 are “don’t connect” 3. System considerations Switching between active and standby conditions via the chip enable pin may produce transient voltage excursions. Unless accommodated by the system design, these transients may exceed datasheet limits, resulting in device non-conformance. At a minimum, a 0.1µF, high-frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected between the V and ground terminals of the device, as close to the device as possible. CC Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7µF bulk electrolytic capacitor should be utilized, again connected between the V and ground terminals. This capacitor should be positioned as CC close as possible to the point where the power supply is connected to the array. Figure 3-1. Block diagram Atmel AT27C256R 2 0014O–EPROM–10/11

Atmel AT27C256R 4. Absolute maximum ratings* Temperature under bias. . . . . . . . . . . . . .-55°C to +125°C *NOTICE: Stresses beyond those listed under “Absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only, and functional Storage temperature. . . . . . . . . . . . . . . . .-65°C to +150°C operation of the device at these or any other conditions beyond those indicated in the operational sections of Voltage on any pin with this specification is not implied. Exposure to absolute respect to ground. . . . . . . . . . . . . . . . . . . -2.0V to +7.0V(1) maximum rating conditions for extended periods may affect device reliability. Voltage on A9 with respect to ground . . . . . . . . . . . . . . . . .-2.0V to +14.0V(1) V supply voltage with PP respect to ground. . . . . . . . . . . . . . . . . .-2.0V to +14.0V(1) Note: 1. Minimum voltage is -0.6V DC, which may undershoot to -2.0V for pulses of less than 20ns. Maximum output pin voltage is V + 0.75V DC, which may overshoot to +7.0V for pulses of less than 20ns. CC 5. DC and AC characteristics Table 5-1. Operating Modes Mode/Pin CE OE Ai V Outputs PP Read V V Ai V D IL IL CC OUT Output disable V V X(1) V High Z IL IH CC Standby V X(1) X(1) V High Z IH CC Rapid program(2) V V Ai V D IL IH PP IN PGM verify(2) X(1) V Ai V D IL PP OUT Optional PGM verify(2) V V Ai V D IL IL CC OUT PGM inhibit(2) V V X(1) V High Z IH IH PP A9 = V (3) H Product identification(4) V V A0 = V or V V Identification code IL IL IH IL CC A1 - A14 = V IL Notes: 1. X can be V or V . IL IH 2. Refer to programming characteristics. 3. V = 12.0 ± 0.5V. H 4. Two identifier bytes may be selected. All Ai inputs are held low (V ), except A9, which is set to V , and A0, which is tog- IL H gled low (V ) to select the manufacturer’s identification byte and high (V ) to select the device code byte. IL IH Table 5-2. DC and AC operating conditions for read operation Atmel AT27C256R -45 -70 Operating temp. (case) Ind. -40C - 85C -40C - 85C Auto. -40C - 125C V supply 5V ±10% 5V ±10% CC 3 0014O–EPROM–10/11

Table 5-3. DC and operating characteristics for read operation Symbol Parameter Condition Min Max Units Ind. ±1 µA I Input load current V = 0V to V LI IN CC Auto. ±5 µA Ind. ±5 µA I Output leakage current V = 0V to V LO OUT CC Auto. ±10 µA I (2) V (1) read/standby current V = V 10 µA PP1 PP PP CC I (CMOS), CE = V  0.3V 100 µA I V (1) standby current SB1 CC SB CC I (TTL), CE = 2.0 to V + 0.5V 1 mA SB2 CC I V active current f = 5MHz, I = 0mA, E = V 20 mA CC CC OUT IL V Input low voltage -0.6 0.8 V IL V Input high voltage 2.0 V + 0.5 V IH CC V Output low voltage I = 2.1mA 0.4 V OL OL V Output high voltage I = -400µA 2.4 V OH OH Notes: 1. V must be applied simultaneously with or before V , and removed simultaneously with or after V . CC PP PP 2. V may be connected directly to V , except during programming. The supply current would then be the sum of I and PP CC CC I . PP Table 5-4. AC characteristics for read operation Atmel AT27C256R -45 -70 Symbol Parameter Condition Min Max Min Max Units t (1) Address to output delay CE = OE = V 45 70 ns ACC IL t (1) CE to output delay OE = V 45 70 ns CE IL t (1) OE to output delay CE = V 20 30 ns OE IL t (1) OE or CE high to output float, whichever occurred first 20 25 ns DF Output hold from address, CE or OE, whichever occurred t 7 7 ns OH first Note: 1. See AC waveforms for read operation. Atmel AT27C256R 4 0014O–EPROM–10/11

Atmel AT27C256R Figure 5-1. AC waveforms for read operation(1) Notes: 1. Timing measurement reference level is 1.5V for -45 devices. Input AC drive levels are V = 0.0V and V = 3.0V. Timing IL IH measurement reference levels for all other speed grades are V = 0.8V and V = 2.0V. Input AC drive levels are V = OL OH IL 0.45V and V = 2.4V. IH 2. OE may be delayed up to t - t after the falling edge of CE without impact on t . CE OE CE 3. OE may be delayed up to t - t after the address is valid without impact on t . ACC OE ACC 4. This parameter is only sampled, and is not 100% tested. 5. Output float is defined as the point when data is no longer driven. Figure 5-2. Input test waveforms and measurement levels For -45 devices only: t , t < 5ns (10% to 90%) R F For -70 devices: t , t < 20ns (10% to 90%) R F 5 0014O–EPROM–10/11

Figure 5-3. Output test load Note: 1. C = 100pF including jig capacitance, except for the -45 devices, where C = 30pF. L L Table 5-5. Pin capacitance f = 1MHz, T = 25°C(1) Symbol Typ Max Units Conditions C 4 6 pF V = 0V IN IN C 8 12 pF V = 0V OUT OUT Note: 1. Typical values for nominal supply voltage. This parameter is only sampled, and is not 100% tested. Figure 5-4. Programming Waveforms(1) Notes: 1. The input timing reference is 0.8V for V and 2.0V for V . IL IH 2. t and t are characteristics of the device, but must be accommodated by the programmer. OE DFP 3. When programming the Atmel AT27C256R, a 0.1µF capacitor is required across V and ground to suppress spurious volt- PP age transients. Atmel AT27C256R 6 0014O–EPROM–10/11

Atmel AT27C256R Table 5-6. DC programming characteristics T = 25  5°C, V = 6.5  0.25V, V = 13.0  0.25V A CC PP Limits Symbol Parameter Test Conditions Min Max Units I Input load current V = V ,V ±10 µA LI IN IL IH V Input low level -0.6 0.8 V IL V Input high level 2.0 V + 1 V IH CC V Output low volt I = 2.1mA 0.4 V OL OL V Output high volt I = -400µA 2.4 V OH OH I V supply current (program and verify) 25 mA CC2 CC I V current CE = V 25 mA PP2 PP IL V A9 product identification voltage 11.5 12.5 V ID Table 5-7. AC programming characteristics T = 25  5°C, V = 6.5  0.25V, V = 13.0  0.25V A CC PP Limits Symbol Parameter Test conditions(1) Min Max Units t Address setup time 2 µs AS tOES OE setup time Input rise and fall times 2 µs t Data setup time (10% to 90%) 20ns 2 µs DS t Address hold time 0 µs AH Input pulse levels t Data hold time 2 µs DH 0.45V to 2.4V t OE high to output float delay(2) 0 130 ns DFP Input timing reference level t V setup time 2 µs VPS PP 0.8V to 2.0V t V setup time 2 µs VCS CC t CE program pulse width(3) Output timing reference level 95 105 µs PW t Data valid from OE(2) 0.8V to 2.0V 150 ns OE t V pulse rise time during programming 50 ns PRT PP Notes: 1. V must be applied simultaneously with or before V and removed simultaneously with or after V . CC PP PP 2. This parameter is only sampled, and is not 100% tested. Output float is defined as the point where data is no longer driven. See timing diagram. 3. Program pulse width tolerance is 100µs 5%. Table 5-8. The Atmel AT27C256R integrated product identification code Pins Hex Codes A0 O7 O6 O5 O4 O3 O2 O1 O0 data Manufacturer 0 0 0 0 1 1 1 1 0 1E Device type 1 1 0 0 0 1 1 0 0 8C 7 0014O–EPROM–10/11

6. Rapidprogramming algorithm A 100µs CE pulse width is used to program. The address is set to the first location. V is raised to 6.5V and V is raised to CC PP 13.0V. Each address is first programmed with one 100µs CE pulse without verification. Then a verification/reprogramming loop is executed for each address. In the event a byte fails to pass verification, up to 10 successive 100µs pulses are applied with a verification after each pulse. If the byte fails to verify after 10 pulses have been applied, the part is considered failed. After the byte verifies properly, the next address is selected until all have been checked. V is then PP lowered to 5.0V and V to 5.0V. All bytes are read again and compared with the original data to determine if the device CC passes or fails. Figure 6-1. Rapid programming algorithm Atmel AT27C256R 8 0014O–EPROM–10/11

Atmel AT27C256R 7. Ordering information Green package (Pb/halide-free) tACC ICC (mA) (ns) Active Standby Atmel ordering code Package Lead finish Operation range AT27C256R-45JU 32J Matte tin Industrial 45 20 0.1 AT27C256R-45PU 28P6 Matte tin (-40C to 85C) AT27C256R-70JU 32J Matte tin Industrial 70 20 0.1 AT27C256R-70PU 28P6 Matte tin (-40C to 85C) Package type 32J 32-lead,plastic,J-leadedchipcarrier(PLCC) 28P6 28-lead,0.600"wide,plastic,dualinlinepackage(PDIP) 9 0014O–EPROM–10/11

8. Packaging information 32J – PLCC 1.14(0.045) X 45° PIN NO. 1 1.14(0.045) X 45° IDENTIFIER 0.318(0.0125) 0.191(0.0075) E1 E B1 E2 B e A2 D1 A1 D A 0.51(0.020)MAX 45° MAX (3X) COMMON DIMENSIONS (Unit of measure = mm) SYMBOL MIN NOM MAX NOTE D2 A 3.175 – 3.556 A1 1.524 – 2.413 A2 0.381 – – D 12.319 – 12.573 D1 11.354 – 11.506 Note 2 D2 9.906 – 10.922 Notes: 1. This package conforms to JEDEC reference MS-016, variation AE. E 14.859 – 15.113 2. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is .010"(0.254mm) per side. Dimension D1 E1 13.894 – 14.046 Note 2 and E1 include mold mismatch and are measured at the extreme E2 12.471 – 13.487 material condition at the upper or lower parting line. 3. Lead coplanarity is 0.004" (0.10mm) maximum. B 0.660 – 0.813 B1 0.330 – 0.533 e 1.270 TYP 10/04/01 TITLE DRAWING NO. REV. Package drawing contact: 32J, 32-lead, plastic J-leaded chip carrier (PLCC) packagedrawings@atmel.com 32J B Atmel AT27C256R 10 0014O–EPROM–10/11

Atmel AT27C256R 28P6 – PDIP D PIN 1 E1 A SEATING PLANE A1 L B B1 e E COMMON DIMENSIONS 0º ~ 15º REF (Unit of Measure = mm) C SYMBOL MIN NOM MAX NOTE eB A – – 4.826 A1 0.381 – – D 36.703 – 37.338 Note 2 E 15.240 – 15.875 E1 13.462 – 13.970 Note 2 B 0.356 – 0.559 B1 1.041 – 1.651 Notes: 1. This package conforms to JEDEC reference MS-011, variation AB 2. Dimensions D and E1 do not include mold flash or protrusion L 3.048 – 3.556 mold flash or protrusion shall not exceed 0.25mm (0.010") C 0.203 – 0.381 eB 15.494 – 17.526 e 2.540 TYP 09/28/01 TITLE DRAWING NO. REV. Package drawing contact: 28P6, 28-lead (0.600"/15.24mm wide) plastic dual packagedrawings@atmel.com 28P6 B inline package (PDIP) 11 0014O–EPROM–10/11

9. Revision history Doc. rev. Date Comments 0014O 10/2011 Correct pinouts 0014N 04/2011 Remove TSOP and SOIC packages Add lead finish to ordering information 0014M 12/2007 Atmel AT27C256R 12 0014O–EPROM–10/11

Atmel Corporation Atmel Asia Limited Atmel Munich GmbH Atmel Japan 2325 Orchard Parkway Unit 01-5 & 16, 19F Business Campus 9F, Tonetsu Shinkawa Bldg. San Jose, CA 95131 BEA Tower, Millennium City 5 Parkring 4 1-24-8 Shinkawa USA 418 Kwun Tong Road D-85748 Garching b. Munich Chuo-ku, Tokyo 104-0033 Tel: (+1) (408) 441-0311 Kwun Tong, Kowloon GERMANY JAPAN Fax: (+1) (408) 487-2600 HONG KONG Tel: (+49) 89-31970-0 Tel: (+81) (3) 3523-3551 www.atmel.com Tel: (+852) 2245-6100 Fax: (+49) 89-3194621 Fax: (+81) (3) 3523-7581 Fax: (+852) 2722-1369 © 2011 Atmel Corporation. All rights reserved. / Rev.: 0014O–EPROM–10/11 Atmel®, logo and combinations thereof, and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trade- marks of others. Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS AND PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: AT27C256R-90JI AT27C256R-90JC AT27C256R-90TC AT27C256R-70JI AT27C256R-45JC AT27C256R-45JI AT27C256R-45TC AT27C256R-45PI AT27C256R-45RI AT27C256R-12JC AT27C256R-12JI AT27C256R-70PI AT27C256R-15TC AT27C256R-15RC AT27C256R-15JI AT27C256R-70JC AT27C256R-55JI AT27C256R-55JC AT27C256R-45PU AT27C256R-70PU AT27C256R-45JU AT27C256R-70JU AT27C256R-70RI AT27C256R-45RU AT27C256R-70RU AT27C256R-45TI AT27C256R-70TI AT27C256R-45TU AT27C256R-70TU AT27C256R-12PC AT27C256R-12RC AT27C256R-15JC AT27C256R-15PC AT27C256R-15PI AT27C256R-55PC AT27C256R-70PC AT27C256R-90PC AT27C256R-70JU-T AT27C256R-70JU-306 AT27C256R-45JU-T