Fast Read Access Time Power CMOS Operation max. Standby max. Acti

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Fast Read Access Time Power CMOS Operation max. Standby max. Acti

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AT27C020
Fast Read Access Time Power CMOS Operation
max. Standby max. Active JEDEC Standard Packages 32-Lead 600-mil PDIP 32-Lead PLCC 32-Lead TSOP 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 Temperature Ranges
2-Megabit (256K EPROM AT27C020
Description
AT27C020 low-power, high performance 2,097,152-bit one-time programmable read only memory (OTP EPROM) organized 256K bits. requires only power supply normal read mode operation. byte accessed less than eliminating need speed reducing WAIT states high performance microprocessor systems. read mode, AT27C020 typically consumes Standby mode supply current typically less than PLCC View Name Function Addresses Outputs Chip Enable Output Enable Program Strobe
Configurations
PDIP View
TSOP View Type
Rev. 0570C-B-12/97
AT27C020 available choice industry standard JEDEC-approved one-time programmable (OTP) plastic PDIP, PLCC, TSOP packages. devices feature twoline control (CE, give designers flexibility prevent contention. With 256K byte storage capability, AT27C020 allows firmware stored reliably accessed system without delays mass storage media. Atmel's 27C020 have 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.
Block Diagram
AT27C020
AT27C020
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: *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 Maximum output voltage 0.75V which overshoot +7.0V pulses less than
Supply Voltage with Respect Ground -2.0V +14.0V(1)
Operating Modes
Mode/Pin Read Output Disable Standby Rapid Program Verify Inhibit Product Identification
Notes:
X(1)
VH(3)
Outputs DOUT High High DOUT High Identification Code
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
AT27C020 Operating Temperature (Case) Power Supply Com. Ind. 70°C -40°C 70°C -40°C 70°C -40°C 70°C -40°C 70°C -40°C
Operating Characteristics Read Operation
Symbol Notes:
Parameter Input Load Current Output Leakage Current
Condition (Com., Ind.) VOUT (Com., Ind.) ISB1 (CMOS), 0.3V ISB2 (TTL), 0.5V MHz, IOUT
±1.0 ±5.0
Units
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 before VPP, removed simultaneously after VPP. connected directly except during programming. supply current would then IPP.
Characteristics Read Operation
AT27C020 Symbol tACC(3) tCE(2) tOE(2)(3) tDF(4)(5) Parameter Address Output Delay Output Delay Output Delay High Output Float, whichever occurred first Output Hold from Address, OE,whichever occurred first Condition Units
Note:
Waveforms Read Operation diagram.
AT27C020
AT27C020
Waveforms Read Operation(1)
Notes:
Timing measurement references 0.8V 2.0V. Input drive levels 0.45V 2.4V, unless otherwise specified. 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:
3.0V DRIVING LEVELS 0.0V 1.5V MEASUREMENT LEVEL
Output Test Load
(10% 90%)
-70,-90,-12,-15 devices only:
Note:
including capacitance except devices where
(10% 90%)
Capacitance
MHz, 25°C(1) COUT
Note:
Units
Conditions VOUT
Typical values nominal supply voltage. This parameter only sampled 100% tested.
Programming Waveforms
Notes:
Input Timing reference 0.8V 2.0V VIH. tDFP characteristics device must accommodated programmer. When programming AT27C020, capacitor required across ground suppress 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 Voltage Output High Voltage Supply Current (Program Verify) Supply Current Product Identification Voltage 11.5 -400 12.5 Test Conditions VIL, -0.6 Units
AT27C020
AT27C020
Programming Characteristics
5°C, 0.25V,VPP 13.0 0.25V Limits Symbol tCES tOES tDFP tVPS tVCS tPRT
Notes:
Parameter Address Setup Time Setup Time Setup Time Data Setup Time Address Hold Time Data Hold Time High Output Float Delay Setup Time Time Program Pulse Width(3) Data Valid from Pulse Rise Time During Programming
Test Condition
Units
Input Rise Fall Times: (10% 90%) Input Pulse Levels: 0.45V 2.4V Input Timing Reference Level: 0.8V 2.0V Output Timing Reference Level: 0.8V 2.0V
must applied simultaneously before removed simultaneously after VPP. This parameter only sampled 100% tested. Output Float defined point where data longer driven timing diagram. Program Pulse width tolerance
Atmel's 27C020 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.
AT27C020
AT27C020
Ordering Information
tACC (ns) (mA) Active Standby Ordering Code AT27C020-55JC AT27C020-55PC AT27C020-55TC AT27C020-55JI AT27C020-55PI AT27C020-55TI AT27C020-70JC AT27C020-70PC AT27C020-70TC AT27C020-70JI AT27C020-70PI AT27C020-70TI AT27C020-90JC AT27C020-90PC AT27C020-90TC AT27C020-90JI AT27C020-90PI AT27C020-90TI AT27C020-12JC AT27C020-12PC AT27C020-12TC AT27C020-12JI AT27C020-12PI AT27C020-12TI AT27C020-15JC AT27C020-15PC AT27C020-15TC AT27C020-15JI AT27C020-15PI AT27C020-15TI Package 32P6 32P6 32P6 32P6 32P6 32P6 32P6 32P6 32P6 32P6 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) Commercial (0°C 70°C) Industrial (-40°C 85°C) Commercial (0°C 70°C) Industrial (-40°C 85°C)
Package Type 32P6 32-Lead,Plastic J-Leaded Chip Carrier (PLCC) 32-Lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) 32-Lead, Plastic Thin Small Outline Package (TSOP)

Fast Read Access Time Power CMOS Operation max. Standby max. Acti

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