max. Standby max. Active JEDEC Standard Packages 28-Lead 600-mil PDIP
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Fast Read Access Time Low-Power CMOS Operation
max. Standby max. Active JEDEC Standard Packages 28-Lead 600-mil PDIP 32-Lead PLCC 28-Lead TSOP SOIC Supply High Reliability CMOS Technology 2,000V Protection Latchup Immunity RapidProgramming Algorithm µs/byte (typical) CMOS Compatible Inputs Outputs Integrated Product Identification Code Commercial, Industrial Automotive Temperature Ranges
256K (32K EPROM AT27C256R
Description
AT27C256R low-power, high-performance 262,144-bit one-time programmable read only memory (OTP EPROM) organized bits. requires only power supply normal read mode operation. byte accessed less than eliminating need speed reducing WAIT states high-performance microprocessor systems. Atmel's scaled CMOS technology provides low-active power consumption, fast programming. Power consumption typically only Active Mode less than Standby. (continued)
Configurations
Name Function Addresses Outputs Chip Enable Output Enable Connect
PDIP SOIC View
256K EPROM
PLCC View TSOP View Type
Note:
PLCC Package Pins DON'T CONNECT.
Rev. 0014H-07/98
AT27C256R available choice industry standard JEDEC-approved time programmable (OTP) plastic DIP, PLCC, SOIC, TSOP packages. devices feature two-line control (CE, give designers flexibility prevent contention. With byte storage capability, AT27C256R allows firmware stored reliably accessed system without delays mass storage media. Atmel's 27C256R additional features ensure high quality efficient production use. RapidProgramming Algorithm reduces time required program part guarantees reliable programming. Programming time typically only µs/byte. Integrated Product Identification Code electronically identifies device manufacturer. This feature used industry standard programming equipment select proper programming algorithms voltages.
System Considerations
Switching between active standby conditions Chip Enable produce transient voltage excursions. Unless accommodated system design, these transients exceed data sheet limits, resulting device non-conformance. minimum, high frequency, inherent inductance, ceramic capacitor should utilized each device. This capacitor should connected between Ground terminals device, close device possible. Additionally, stabilize supply voltage level printed circuit boards with large EPROM arrays, bulk electrolytic capacitor should utilized, again connected between Ground terminals. This capacitor should positioned close possible point where power supply connected array.
AT27C256R
AT27C256R
Block Diagram
Absolute Maximum Ratings*
Temperature Under Bias -55°C +125°C Storage Temperature -65°C +150°C Voltage with Respect Ground .-2.0V +7.0V(1) Voltage with Respect Ground .-2.0V +14.0V(1) Note: Supply Voltage with Respect Ground .-2.0V +14.0V(1) *NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions beyond those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Minimum voltage -0.6V which undershoot -2.0V pulses less than ns.Maximum output voltage 0.75V which overshoot +7.0 volts pulses less than
Operating Modes
Mode\Pin Read Output Disable Standby Rapid Program Verify(2) Optional Verify(2) Inhibit
X(1)
X(1)
Outputs DOUT High High DOUT DOUT High Identification Code
Product Identification(4) Notes: VIH.
Refer Programming Characteristics. 12.0 0.5V. identifier bytes selected. inputs held (VIL), except which which toggled (VIL) select Manufacturer's Identification byte high (VIH) select Device Code byte.
Operating Conditions Read Operation
AT27C256R Com. Operating Temp. (Case) Supply Ind. Auto. 70°C -40°C 85°C 70°C -40°C 85°C 70°C -40°C 85°C -40°C 125°C 70°C -40°C 85°C -40°C 125°C 70°C -40°C 85°C -40°C 125°C 70°C -40°C 85°C -40°C 125°C
Operating Characteristics Read Operation
Symbol Parameter Input Load Current Condition Com., Ind. Auto. Com., Ind. IPP1 Notes:
Units
Output Leakage Current
VOUT ISB1 (CMOS), 0.3V ISB2 (TTL), 0.5V MHz, IOUT
Auto.
Read/Standby Current
VCC(1) Standby Current Active Current Input Voltage Input High Voltage Output Voltage Output High Voltage
-0.6 -400
must applied simultaneously with before VPP, removed simultaneously with after connected directly VCC, except during programming. supply current would then IPP.
Characteristics Read Operation
AT27C256R Symbol Parameter tACC
Condition
Units
Address Output Delay Output Delay Output Delay
tOE(2)(3) tDF(4)(5) Note:
High Output Float, whichever occurred first Output Hold from Address, whichever occurred first
Waveforms Read Operation.
AT27C256R
AT27C256R
Waveforms Read Operation(1)
Notes:
Timing measurement reference level 1.5V devices. Input drive levels 0.0V 3.0V. Timing measurement reference levels other speed grades 0.8V 2.0V. Input drive levels 0.45V 2.4V. delayed after falling edge without impact tCE. delayed tACC after address valid without impact tACC. This parameter only sampled 100% tested. Output float defined point when data longer driven.
Input Test Waveforms Measurement Levels
devices only:
Output Test Load
(10% 90%) -70, -90, -12, devices: Note: including capacitance, except devices, where
(10% 90%)
Capacitance 1MHz, 25°C)(1)
COUT Note: Units Conditions VOUT
Typical values nominal supply voltage. This parameter only sampled 100% tested.
Programming Waveforms(1)
Notes:
Input Timing Reference 0.8V 2.0V VIH. tDFP characteristics device must accommodated programmer. When programming AT27C256R capacitor required across ground suppress spurious voltage transients.
Programming Characteristics
5°C, 0.25V, 13.0 0.25V
Limits Symbol ICC2 IPP2 Parameter Input Load Current Input Level Input High Level Output Volt Output High Volt Supply Current (Program Verify) Current Product Identification Voltage 11.5 -400 12.5 Test Conditions VIL,VIH -0.6 Units
AT27C256R
AT27C256R
Programming Characteristics
5°C, 0.25V, 13.0 0.25V
Limits Symbol tOES tDFP tVPS tVCS tPRT Notes: Parameter Address Setup Time Setup Time Data Setup Time Address Hold Time Data Hold Time High Output Float Delay(2) Setup Time Setup Time Program Pulse Width Data Valid from
Test Conditions
Units
Input Rise Fall Times (10% 90%) 20ns Input Pulse Levels 0.45V 2.4V Input Timing Reference Level 0.8V 2.0V Output Timing Reference Level 0.8V 2.0V
Pulse Rise Time During Programming
must applied simultaneously before removed simultaneously after This parameter only sampled 100% tested. Output Float defined point where data longer driven- timing diagram. Program Pulse width tolerance µsec
Atmel's 27C256R Integrated Product Identification Code
Pins Codes Manufacturer Device Type Data
Rapid Programming Algorithm
pulse width used program. address first location. raised 6.5V raised 13.0V. Each address first programmed with pulse without verification. Then verification/reprogramming loop executed each address. event byte fails pass verification, successive pulses applied with verification after each pulse. byte fails verify after pulses have been applied, part considered failed. After byte verifies properly, next address selected until have been checked. then lowered 5.0V 5.0V. bytes read again compared with original data determine device passes fails.
AT27C256R
AT27C256R
Ordering Information
tACC (ns) (mA) Active Standby Ordering Code AT27C256R-45JC AT27C256R-45PC AT27C256R-45RC AT27C256R-45TC AT27C256R-45JI AT27C256R-45PI AT27C256R-45RI AT27C256R-45TI AT27C256R-55JC AT27C256R-55PC AT27C256R-55RC AT27C256R-55TC AT27C256R-55JI AT27C256R-55PI AT27C256R-55RI AT27C256R-55TI AT27C256R-70JC AT27C256R-70PC AT27C256R-70RC AT27C256R-70TC AT27C256R-70JI AT27C256R-70PI AT27C256R-70RI AT27C256R-70TI AT27C256R-70JA AT27C256R-70PA AT27C256R-70RA Package 28P6 28P6 28P6 28P6 28P6 28P6 28P6 Operation Range Commercial (0°C 70°C)
Industrial (-40°C 85°C)
Commercial (0°C 70°C)
Industrial (-40°C 85°C)
Commercial (0°C 70°C)
Industrial (-40°C 85°C)
Automotive (-40°C 125°C)
(continued)
Package Type 28P6 32-Lead, Plastic J-Leaded Chip Carrier (PLCC) 28-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) 28-Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC) 28-Lead, Thin Small Outline Package (TSOP)
Ordering Information (Continued)
tACC (ns) (mA) Active Standby Ordering Code AT27C256R-90JC AT27C256R-90PC AT27C256R-90RC AT27C256R-90TC AT27C256R-90JI AT27C256R-90PI AT27C256R-90RI AT27C256R-90TI AT27C256R-90JA AT27C256R-90PA AT27C256R-90RA AT27C256R-12JC AT27C256R-12PC AT27C256R-12RC AT27C256R-12TC AT27C256R-12JI AT27C256R-12PI AT27C256R-12RI AT27C256R-12TI AT27C256R-12JA AT27C256R-12PA AT27C256R-12RA AT27C256R-15JC AT27C256R-15PC AT27C256R-15RC AT27C256R-15TC AT27C256R-15JI AT27C256R-15PI AT27C256R-15RI AT27C256R-15TI AT27C256R-15JA AT27C256R-15PA AT27C256R-15RA Package 28P6 28P6 28P6 28P6 28P6 28P6 28P6 28P6 28P6 Operation Range Commercial (0°C 70°C)
Industrial (-40°C 85°C)
Automotive (-40°C 125°C) Commercial (0°C 70°C)
Industrial (-40°C 85°C)
Automotive (-40°C 125°C) Commercial (0°C 70°C)
Industrial (-40°C 85°C)
Automotive (-40°C 125°C)
Package Type 28P6 32-Lead, Plastic J-Leaded Chip Carrier (PLCC) 28-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) 28-Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC) 28-Lead, Thin Small Outline Package (TSOP)
AT27C256R
AT27C256R
Packaging Information
32J, 32-Lead, Plastic J-Leaded Chip Carrier (PLCC) Dimensions Inches (Millimeters)
JEDEC STANDARD MS-016
28P6, 28-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) Dimensions Inches (Millimeters)
JEDEC STANDARD MS-011
1.47(37.3) 1.44(36.6)
.045(1.14)
IDENTIFY
.025(.635) .012(.305) .008(.203) .530(13.5) .490(12.4) .021(.533) .013(.330)
.032(.813) .026(.660)
.553(14.0) .547(13.9) .595(15.1) .585(14.9)
.566(14.4) .530(13.5)
1.300(33.02)
.090(2.29) .005(.127)
.050(1.27)
.300(7.62) .430(10.9) .390(9.90) CONTACT POINTS
.030(.762) .015(3.81) .095(2.41) .060(1.52) .140(3.56) .120(3.05)
.220(5.59) SEATING PLANE .161(4.09) .125(3.18) .110(2.79) .090(2.29) .065(1.65) .041(1.04) .630(16.0) .590(15.0) .690(17.5) .610(15.5)
.065(1.65) .015(.381) .022(.559) .014(.356)
.022(.559) (3X) .453(11.5) .447(11.4) .495(12.6) .485(12.3)
.012(.305) .008(.203)
28R, 28-Lead, 0.330" Wide, Plastic Gull Wing Small Outline (SOIC) Dimensions Inches (Millimeters)
28T, 28-Lead, Plastic Thin Small Outline Package (TSOP) Dimensions Millimeters (Inches)*
INDEX MARK AREA 11.9 (0.469) 11.7 (0.461) 13.7 (0.539) 13.1 (0.516)
0.55 (0.022) 7.15 (0.281) 8.10 (0.319) 7.90 (0.311)
0.27 (0.011) 0.18 (0.007)
1.25 (0.049) 1.05 (0.041)
0.20 (0.008) 0.10 (0.004) 0.20 (0.008) 0.15 (0.006)
0.70 (0.028) 0.30 (0.012)
*Controlling dimension: millimeters
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0014H-07/98/xM
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